KR20070035676A - Temperature-pressure error compensation apparatus for volume-measuring type gas meter having automatic meter reading function - Google Patents

Abstract

Disclosed is an on-pressure error correction device for correcting a meter reading error that may be caused by a difference between a temperature and pressure of a city gas passing a capacity city gas meter of a city gas consumer and a reference temperature and a reference pressure applied when a city gas is supplied. . The temperature measuring unit and the pressure measuring unit are installed inside or outside the meter of each customer or a gas pipe adjacent thereto to measure the instantaneous temperature and pressure of the city gas passing through the meter. The on-pressure error correction unit obtains the instantaneous temperature and the instantaneous pressure from the temperature measuring unit and the pressure measuring unit, respectively, at predetermined time intervals, and calculates the instantaneous on-pressure error correction coefficient. In addition, at least one of the daily and monthly on-pressure error correction coefficients is calculated using the calculated instantaneous on-pressure error correction coefficients. At this time, the weight is applied depending on whether or not to use the city gas at the time of measuring the temperature and pressure or during the measurement period. The pressure error correction unit also receives the digitalized daily or monthly guide value from the automatic meter reading device which automatically reads the guide value of the meter, and multiplies the daily guide value by the daily temperature pressure error correction coefficient of the day to calculate the corrected daily usage amount. Accumulated monthly usage is calculated by accumulating the daily usage by month, or the revised monthly usage is calculated by multiplying the monthly guide value by the monthly on-pressure error correction coefficient of the corresponding month. The corrected monthly usage is transmitted by the communication unit to the central computer of the city gas supplier through the local repeater.

Description

Temperature-pressure error compensator for capacitive city gas meter with automatic meter reading function {{Temperature-pressure error compensation apparatus for volume-measuring type gas meter having automatic meter reading function}

Figure 1a is a graph showing the dark current characteristics according to the ambient temperature of the phototransistor used as the light receiving element, Figures 1b and 1c is the relative light intensity and the forward current of the relative temperature of the infrared light emitting diode used as the light emitting element It is a graph which shows the relationship of light intensity, respectively.

Figure 2 is a block diagram showing the overall configuration of the automatic meter reading apparatus employing the on-pressure error correction apparatus according to the present invention.

Figure 3 is an exploded perspective view of an automatic meter reading device having a pressure error correction function according to a preferred embodiment of the present invention, Figure 4 is an installation state thereof.

FIG. 5 illustrates a configuration of an automatic meter reading (AMR) that automatically reads a meter value of a gas meter having a numeric wheel reader in a light sensing manner, according to a preferred embodiment of the present invention. It is sectional drawing seen from the cutting line BB.

FIG. 6 illustrates a configuration of an automatic meter reading (AMR) that automatically reads a meter value of a gas meter having a numeric wheel reader in a sound sensing manner, according to a preferred embodiment of the present invention. It is sectional drawing assuming that the meter part was seen from the cutting line BB of FIG.

7 to 10 are sectional views taken along the line A-A of FIG. 4 as an example of the actual implementation of a temperature measuring unit including a temperature measuring unit and a pressure measuring unit according to the preferred embodiments of the present invention.

11 is a view for explaining a gas flow detection method using a differential pressure sensor.

** Explanation of symbols for main parts of drawings **

10: temperature error correction device 20: temperature measuring unit

25: pressure measurement unit 30: temperature pressure error correction unit

32: central processing unit (CPU) 34: memory

40: time measurement unit 50: gas flow detection unit

60: automatic reading unit 70: display

80: operation unit 90: communication unit

100: automatic meter reading device having a temperature error correction function

110: number wheel type guide section 112: number wheel

120: light reflection unit 130: light sensor unit

140: housing

The present invention relates to an automatic meter reading (AMR) applied to a gas meter, and more particularly, to correct an error of reading data according to a temperature and pressure deviation during automatic reading of a capacitive city gas meter. The present invention relates to an automatic meter reading device having a function capable of.

(1) Causes of thermal pressure error

In Korea, the city gas supply rate system is based on weight. In other words, the city gas transaction between city gas companies (retailers) who sell city gas directly to customers and Korea Gas Corporation (wholesalers) who supply city gas to these companies is in liquefied state. Weight 'unit. In contrast, when local city gas companies (retailers) sell city gas to consumers, the city gas is supplied in gas state through gas pipes. Metered. In other words, gas meters installed in general city gas consumers are mostly capacitive gas meters that measure 'volume', and in particular, homes and businesses have almost the majority of membrane gas meters, which are a type of capacity type. Usage is measured on a 'volume' basis.

The amount of city gas purchased by Korea Gas Corporation (wholesaler) and the amount of city gas sold to the total consumer by each regional city gas company (retailer) should be error free in theory. In practice, however, a significant amount of error is known to occur. The volume for the unit weight of city gas depends on the magnitude of the temperature and pressure. The city gas supplier sends city gas to each customer at a predetermined reference temperature and pressure at the supply reference point where the pressure regulator is installed. However, if the temperature and pressure of the city gas at the point where the city gas meter of each consumer is installed are different from the reference temperature and the reference pressure at the supply reference point, the volume value corresponding to the weight of the city gas exported from the supply reference point and each customer The city gas volume value measured on the meter will also vary. This measurement error is an error due to temperature / pressure deviation (hereinafter referred to as 'temperature pressure error'). Indeed, there is a non-negligible error between the quantity of gas purchased by local gas companies from Korea Gas Corporation and the amount sold to customers of each city gas company. have.

In Korea, the standard temperature and pressure are 0 ℃ and 1 atm, and the gas is sent at a gauge pressure of 20-25 millibars in consideration of the decrease in gas pressure from the constant pressure to the gas meter of each consumer. As the gas density changes under the influence of ambient temperature and atmospheric pressure during transportation of city gas to each customer through the pipe, the meter reading of the gas meter varies from day to night. The volumetric container of the capacitive gas meter is made of a membrane and is flexible, so that the reading of the meter may vary depending on the ambient temperature and pressure. As such, the discrepancy between the temperature and pressure reference values applied by the city gas company when sending city gas from the local pressure regulator to each consumer and the actual temperature and pressure values of each consumer's gas meter is the measured value of the city gas usage for each consumer. Error, causing economic loss to the supplier or customer. For example, the use of city gas in hot or high altitudes can lead to irrationalities that require the same cost to use less calories (calories are not proportional to volume, but moles) compared to cold or lowlands. have.

(2) Conventional Techniques for Correcting Pressure Error

The present inventor has recognized the cause of the occurrence of such a pressure error, has found a solution for the cause and filed a patent application (Patent Application No. 10-2003-0053627, title of the invention: 'On-pressure calibration function for gas meter Refer to 'Remote Meter Reading Device'. However, in the case of temperature, the temperature-pressure compensator proposed in the patent application is one in which a temperature measuring device is installed for each meter (for example, a temperature sensor is attached to the inside or the surface of a gas pipe, or a temperature sensor is placed inside or on the surface of the meter or around the meter). For the pressure, install a pressure gauge (which measures atmospheric pressure, not gas pressure) for multiple meters installed in the unit area, and then transmit the measured atmospheric pressure information to the wireless network ( It is transmitted to several meters using a wireless network of remote meter reading and sharing.

However, the temperature or pressure of the metering point of the city gas usage, that is, the point where the meter is installed, is not necessarily the same for each customer, but rather, it is generally different. It is common for city gas temperature and pressure at the metering point of each consumer to be different from the reference temperature and pressure applied for city gas supply. Therefore, the most accurate data for minimizing the on-pressure error is the current temperature and pressure information of the city gas passing through the metered point for each customer. In addition, the pressure information of the city gas itself is more useful than the atmospheric pressure information to accurately correct the pressure error.

However, the above conventional technology not only uses the atmospheric pressure information but the pressure information of the city gas itself in order to correct the pressure error, and the atmospheric pressure information at one point in the unit area instead of the meter installation point of each customer in the area. As it is a method used for error correction of all meters, there is a lack of accurate compensation of pressure error. Because the information necessary for correcting the pressure error is the difference between the pressure information of the city gas passing through the meter of each consumer and the reference pressure information applied when supplying the city gas, since such information cannot be obtained by the conventional method. to be. In addition, according to the conventional method, the position where the pressure measuring unit (barometric pressure measuring unit) and the temperature measuring unit are installed is different from each other. Therefore, the pressure measuring part and the temperature measuring part should be made separately. Furthermore, each installation must be done separately.

On the other hand, in order to correct the above-mentioned pressure error, the work of converting the meter reading value (the numerical value indicated by the number wheel or the rotating needle to the value indicated on the rotation scale in the case of a film type city gas meter) must be performed in parallel. Digitization of meter readings can be accomplished using remote automatic meter reading (AMR) devices. Known automatic meter reading method is, firstly, an optical automatic meter that counts the digital value by changing the number of wheels or the number of revolutions of the rotating needle with an electric signal using an optical sensor and counts the meter using a magnetic sensor. Magnetic automatic metering that counts the number of revolutions of the wheel as a digital value, a unique sound is generated mechanically every time a specific number wheel or spinning needle rotates, and the sound is detected to detect the number of revolutions of the number wheel or spinning needle. There are acoustic automatic metering that counts, and image reading automatic metering that counts the instructions on the digital display of the meter and then counts them digitally by applying character recognition technology. Any of these ways can be combined with the present invention.

The present invention is a city gas usage error that can be generated due to the difference between the temperature and pressure of the city gas passing through the capacitive meter that measures the amount of city gas used by volume and the temperature and pressure applied by the city gas supplier at the supply reference point. That is, an object of the present invention is to provide an on-pressure error correction device for correcting a 'on-pressure error'.

The present invention also has the capacity of automatic meter reading, characterized in that the automatic reading of the guide value of the meter of the city gas consumer, by correcting the 'temperature pressure error' that can be included in the automatic meter reading value It is another object of the present invention to provide a temperature pressure error correction device for an urban gas meter.

According to an aspect of the present invention for achieving the above object, by measuring the temperature of the city gas in the capacitive city gas meter or the gas pipe adjacent to the meter to measure the amount of use by volume unit converted into an electrical signal corresponding to the temperature value Temperature measuring unit to make; A pressure measuring unit measuring the pressure of the city gas in the meter or the gas pipe and converting the pressure into an electric signal corresponding to the pressure value; And receiving instantaneous electric signals from the temperature measuring unit and the pressure measuring unit every first time interval or whenever the amount of use of the city gas reaches a predetermined value, thereby obtaining instantaneous temperature and instantaneous pressure values of the city gas. The instantaneous temperature value and the instantaneous pressure value may be adjusted to compensate for a meter reading error that may be included in the meter reading value due to the difference between the temperature value and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when the city gas is supplied. There is provided a temperature pressure error correction device, comprising: a temperature pressure error correction unit for calculating at least one of the instantaneous temperature error correction coefficient K _TP , the daily temperature error correction coefficient, and the monthly temperature error correction coefficient.

The daily temperature error correction coefficient is determined by the average value of the total instantaneous temperature error correction coefficients calculated on the day, and the monthly temperature error correction coefficient is the total instantaneous temperature error correction coefficient calculated in the month or the total daily pressure error correction coefficients. It is preferable to set it as an average value. Further, in calculating the daily on-pressure error correction coefficient or the monthly on-pressure error correction coefficient, it is preferable to apply a weight corresponding to the use or amount of city gas used at the time of measurement of temperature and pressure or during the measurement period. Applying the weight in this way, more accurate on-pressure error correction can be achieved.

In the temperature and pressure error correction device, the on-pressure error correction unit receives a digital daily or monthly guide value from an automatic meter reading device that automatically reads the guide value of the meter and receives the daily guide value for the daily on-pressure error correction coefficient of the day Calculate the corrected daily usage by multiplying with and accumulate the daily usage monthly to calculate the corrected monthly usage, or multiply the monthly guide value with the monthly on-pressure error correction coefficient of the corresponding month to calculate the corrected monthly usage. It is preferable to provide.

As one method of reflecting the weight, the on-pressure error correcting unit analyzes a change mode with time of a temperature value obtained from the temperature measuring unit or a change mode with time of a pressure value obtained from the pressure measuring unit. It is preferable to further include a function of determining whether the city gas is currently in use and applying a shorter time interval as the value of the first time interval than when the city gas is in use. In doing so, the weight is automatically reflected.

As another method of reflecting the weight, the temperature pressure error correction device is a gas flow detection unit for determining whether the city gas is currently in use by detecting whether the specific number wheel or a specific rotary needle of the meter rotates. The on-pressure error correcting unit further includes a time interval between the time points at which the specific number wheel or the specific rotation needle of the meter completes a predetermined number of rotations based on the detection information of the gas flow detection unit, as the first predetermined time interval. By doing so, the weight is automatically reflected.

As another method of reflecting the weight, the temperature pressure error correction device has a differential pressure sensor that detects the pressure difference between the orifice installed in the meter or the gas pipe and the front and rear points of the orifice and generates an electrical signal corresponding thereto. A gas flow detection unit is further provided, wherein the on-pressure error correction unit analyzes the detection information of the gas flow detection unit to determine whether the city gas is currently in use, and when the city gas is in use, a shorter time than when not in use. And applying the interval as a value of the first time interval to automatically reflect the weight.

According to one configuration of the pressure measuring unit of the temperature pressure error correction device, the pressure measuring unit is coupled between the city gas supply pipe and the city gas meter to constitute a part of the city gas supply pipe; A body part fixed to the gas pipe member and having a pressure passage formed therein, one end of which is in communication with the gas pipe member and the other end of which is terminated by a closed storage cavity; A pressure sensor disposed in the accommodation cavity of the body and generating an electrical signal corresponding to the magnitude of the pressure around the body; Isolating means disposed in the middle of the pressure pipe in the body portion to allow the pressure of the city gas in the gas pipe to be transmitted to the pressure sensor but to prevent the city gas from coming into direct contact with the pressure sensor; And a pressure signal processor disposed outside the body and electrically connected to the output terminal of the pressure sensor, and configured to process the output electrical signal of the pressure sensor and convert the output electrical signal into a digital signal corresponding to the pressure of the city gas. The isolation means includes at least one of at least one membrane disposed in a form crossing the pressure line at a predetermined point of the pressure line, and at least one of a liquid material filled at a predetermined height in a portion of the U or V-shaped line of the pressure line. It is preferable to use.

According to a configuration example of the temperature measuring unit of the temperature pressure error correction device, the temperature measuring unit is installed inside or outside the gas pipe member and converts into an electrical signal corresponding to the ambient temperature, and an output terminal of the temperature sensor; And a temperature signal processor which is electrically connected and converts the output electrical signal of the temperature sensor into a digital signal corresponding to the ambient temperature.

According to another configuration of the pressure measuring unit of the temperature pressure error correction device, the pressure measuring unit is coupled between the city gas supply pipe and the city gas meter to constitute a part of the city gas supply pipe; A body part fixed to the gas pipe member and having one end communicating with the gas pipe member, an opposite end being closed, and at least a portion of the pressure pipe having an upright portion; A liquid substance filled up to a predetermined level of the upright section of the pressure pipe and having a height of the liquid column corresponding to a change in the pressure in the gas pipe; The permanent magnet is placed on the float having the characteristics of floating in the liquid material and located at approximately the middle height within the level fluctuation range of the liquid material corresponding to the expected pressure fluctuation range of the city gas in the gas pipe, which is installed outside the body part. A pressure sensor unit for outputting an electric signal corresponding to the magnitude of the pressure of the city gas, including a magnetic field sensor for outputting an electric signal having a level corresponding to the strength of the magnetic field formed by the permanent magnet; And a pressure signal processing unit for converting the output electrical signal of the pressure sensor unit into a digital signal corresponding to the pressure of the city gas.

The on-pressure error correcting unit of the temperature and pressure error correction device, a central processing unit for performing the calculation required to calculate at least the on-pressure error correction coefficient and the corrected gas consumption using the same, and connected to the central processing unit and the operation and And a memory for providing a data storage space and a time measuring unit connected to the central processing unit to count a current time and providing the information to the central processing unit.

On the other hand, according to another aspect of the present invention for achieving the above object, the digital guidance corresponding to the guide value of the city gas usage shown in the numeric or scale plate of the capacitive city gas meter for reading the city gas usage by volume unit Automatic meter reading unit for automatically converting to a value; A temperature measuring unit measuring the temperature of the city gas in the meter or a gas pipe adjacent thereto and converting the temperature into an electric signal corresponding to the temperature value; A pressure measuring unit measuring the pressure of the city gas in the meter or a gas pipe adjacent thereto and converting the pressure into an electric signal corresponding to the pressure value; Every time interval or when the amount of use of the city gas reaches a predetermined value, an electric signal is received from the temperature measuring unit and the pressure measuring unit to obtain instantaneous temperature and instantaneous pressure values of the city gas. The instantaneous temperature value and the instantaneous pressure value are used to compensate for the meter reading error that may be included in the meter reading value due to the difference between the value and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when the city gas is supplied. By calculating at least one of the instantaneous on-temperature error correction coefficient K _TP , the daily on-pressure error correction coefficient and the monthly on-pressure error correction coefficient, and receives the daily or monthly digital guide value from the automatic meter reading means corresponding to the daily guide value Daily or monthly correction, multiplied by the daily on-pressure error correction factor or the monthly on-pressure error correction factor for the month It is provided with a pressure error correction unit for calculating the amount of usage, the amount of meter reading that can be included in the meter value of the capacitive city gas meter due to the difference between the instantaneous temperature value and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when the city gas supply There is provided a temperature pressure error correction device for a capacitive city gas meter having an automatic metering function, characterized in that it compensates for errors.

The automatic meter reading unit may be configured by a light sensing method using an optical sensor. The light sensing type automatic meter reading unit receives one or more light emitting elements that irradiate light to a rotation area of a specific number wheel or a specific rotation needle that indicates a position less than or equal to the effective digit of the meter, and receives light reflected from the rotation area. One or more light-receiving elements for converting into corresponding electric signals, and analyzing the change behavior over time of the electrical signal provided by the light-receiving elements to determine whether the number wheel or the rotating needle has completed one revolution. And a rotation speed counting unit for counting the rotation speed of the specific number wheel or the specific rotation needle.

The automatic meter reading unit may be configured by a magnetic sensing method using a magnetic sensor. Self-sensing type automatic reading unit is a magnet installed on a specific number wheel or a specific rotating needle that represents a position below the effective digit of the meter, and is disposed at a specific point on the rotation path of the magnet to approach the magnet within a predetermined distance. And a magnetic sensor for outputting electric signals of different levels when escaping from and a change in time of the electrical signal provided by the magnetic sensor to determine whether the number wheel or the rotating needle has completed one revolution. It is preferable to have a configuration having a rotation count unit for counting the number of revolutions of the specific number wheel or the specific rotary needle in a manner.

In addition, the automatic meter reading unit may be configured by a sound sensing method using a sound key. The automatic sensing unit of the acoustic sensing method includes sound generating means for generating a specific sound every time a specific number wheel or a specific rotary needle rotates one revolution or less, and the sound generated by the sound generating means is detected. It is preferable to have a configuration including a speed counting means for counting the number of revolutions of the specific number wheel or the specific rotary needle in such a manner as to determine that the number wheel or the specific rotary needle has made one revolution.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 2 is a block diagram showing the overall configuration of the automatic meter reading apparatus 100 employing the on-pressure error correction device. The automatic meter reading device 100 includes an automatic meter reading unit 60 for automatically reading the guide value of the meter 4 and an on-pressure error correcting device 10 that calculates a corrected amount of use by correcting the on-pressure error included in the automatic meter reading value. And a display unit 70 connected to the central processing unit 32 in the on-pressure error correcting device 10 for displaying various information acquired or calculated by the central processing unit 32, and the user's automatic reading and on-pressure Receives the corrected amount of usage information calculated by the user operating unit 80 and the on-pressure error correction unit 30 for delivering necessary instructions with respect to the correction, etc. It has a configuration including a communication unit 90 for transmitting to.

This automatic meter reading device 100 is provided for each city gas consumer. One city gas supply company divides the area where it supplies city gas into several unit areas, installs a local wireless repeater 92 in each unit area, and local wireless repeaters 92 installed in each unit area The computer 96 of the gas supply company is connected to a wired communication network or a wireless communication network (for example, data communication using a mobile telephone communication network). In each unit area, for example, there are tens or thousands of households of city gas consumers, and the automatic meter reading device 100 installed for each customer transmits the usage amount of which the pressure difference is corrected to the local wireless repeater 92, and eventually the city. The usage information is transmitted to the gas company's computer 96.

The temperature-pressure error correcting apparatus 10 measures the temperature measuring unit 20 and the pressure measuring unit 25 for measuring the temperature and pressure of the city gas passing through the capacitive city gas meter 4, and the measured temperature and pressure. It has the on-pressure error correction unit 30 for calculating the on-pressure error correction coefficient. In addition, the on-pressure error correction device 10 preferably has a time measuring unit 40 for counting the current time and providing the information to the on-pressure error correction unit 30. The temperature measuring unit 20 measures the temperature of the city gas in the meter 4 or the gas pipe 2 adjacent to the meter and converts it into an electric signal corresponding to the temperature value. Here, the meter 4 is a capacitive city gas meter for measuring the amount of use in volume units. The pressure measuring unit 25 measures the pressure of the city gas in the meter 4 or the gas pipe 2 and converts the pressure into an electric signal corresponding to the pressure value.

The on-pressure error correction unit 30 obtains the instantaneous temperature and instantaneous pressure information of the city gas from the temperature measuring unit 20 and the pressure measuring unit 25, and corrects the on-pressure error included in the automatic reading value by using the information. The on-pressure error correction coefficient can be calculated, and the corrected city gas consumption is also calculated. For such a calculation process, the on-pressure error correction unit 30 is connected to a central processing unit (CPU) 32 that performs at least the calculation necessary for calculating the on-pressure error correction coefficient and calculating the corrected gas consumption using the same. It has a memory 34 that provides a data storage space required for the above operation and data storage. Specifically, the on-pressure error correction unit 30 receives an electrical signal corresponding to the temperature and pressure measured from the temperature measuring unit 20 and the pressure measuring unit 25 periodically or irregularly, and thereby receives the instantaneous temperature of the city gas. The value of the instantaneous pressure is obtained and stored in the memory 34. In addition, using the instantaneous temperature value and an instantaneous pressure value, the instantaneous temperature and pressure error compensation coefficient K _TP, and calculates the daily temperature and pressure error correction factor and monthly temperature and pressure at least any one of the error correction factor with the date information, or month information memory (34 ). The calculated pressure error correction coefficient may be included in the meter reading of the meter due to the difference between the instantaneous temperature and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when supplying the city gas. That is used to compensate for meter reading errors.

The instantaneous temperature error correction coefficient K _TP is calculated by the following equation (1). In Equation (1), P and T represent instantaneous pressure values and instantaneous temperature values, respectively.

...... (1)

...... (One)

Equation (1) is obtained using Boyle-Charles' law. More specifically, the volume of the gas is expressed by the following equation (2) according to the temperature and pressure.

P × V = Z × n × R × T ... (2)

Where P is the absolute pressure of the gas, V is the volume of the gas, Z is the compression coefficient, and the value is affected by temperature and pressure, N is the number of moles of gas, and T is the temperature of the gas (absolute temperature ( ^o K) However, since the pressure and temperature of the city gas passing through the meter 4 are relatively low, 1013-1300 hPa at absolute pressure, and the temperature is also near room temperature, even if Z = 1, there is no big difference. ), The reference temperature (T _o ) and the reference pressure (P _o ) that the city gas company applies when supplying gas-0 ^o C (273 ^o K), 1 atm (1013 hPa) in our country. Regarding the volume (V _o ) of the city gas at Lm, the volume V of the city gas at an arbitrary temperature (T) pressure (P) is expressed as follows.

...... (3)

...... (3)

Equation (3) above is the well-known "Boyle-Charles's Law," which is clearly described with respect to gas. Using transplantation, the volume of city gas measured at any temperature (T) and pressure (V) is the volume of city gas at reference temperature (T _o ) and reference pressure (P _o ). V _o ) 'can be obtained. If equation (3) is expressed differently,

...... (4)

...... (4)

Becomes Since the usage amount of the city gas measured by the meter 4 at a certain temperature, that is, the used volume V, is known, the instantaneous temperature T and the instantaneous temperature of the city gas in the meter 4 or the gas pipe 2 adjacent thereto are known. When the pressure P is measured, the city gas consumption (V) at the reference temperature (e.g., T _o = 0 ^o C = 273 ^o K) and the reference pressure (e.g. P _o = 1013 hPa) applied to the city gas supply is It can be calculated by In Equation (5) below, the remaining value except for the volume V on the right side is the instantaneous temperature error correction coefficient K _TP represented by Equation (1).

...... (5)

...... (5)

Instantaneous Onset Error Correction Factor One method of correcting the onset error using K _{TPs is} that the instantaneous onset error correction coefficient is calculated at predetermined time intervals. Multiply the gas usage guidelines. Alternatively, calculate the daily temperature error correction coefficient, which is the average value of the total instantaneous temperature error correction coefficients calculated for each day, and calculate the corrected daily usage by multiplying each daily pressure error correction coefficient by the city gas usage guide value of the day. Accumulate the monthly usage by accumulating the daily usage monthly, or calculate the monthly on-pressure error correction coefficient, which is the average value of the total instantaneous temperature error correction coefficient calculated for each month or the total daily pressure error correction coefficient, every month. And multiply by the gas usage guidelines. Here, the gas usage automatic meter reading value to be corrected may be obtained from the automatic meter reading unit 60. The automatic meter reading unit 60 automatically reads the guide value of the meter 4 to be described later, generates a digitized signal corresponding to the usage amount, and provides the automatic meter reading value to the on-pressure error correcting unit 30.

On the other hand, in order to more accurately correct the on-pressure error using the on-pressure error correction coefficient, it is preferable to apply a weight depending on whether or not to use the city gas at the time of measuring the temperature and pressure or during the measurement time interval. As a method of applying the decay, the time interval for measuring the temperature and pressure, that is, the time interval for calculating the instantaneous on-pressure error correction coefficient is variably adjusted in connection with the use or use of the city gas. do. As an exemplary method related to the weight application, the temperature error correction unit 30 may change the time according to the time of the temperature value obtained from the temperature measuring unit 20 or the time of the pressure value obtained from the pressure measuring unit 25. By analyzing the change pattern according to the present invention, it is determined whether the city gas is currently in use, and when the city gas is in use, a method of calculating the on-pressure error correction coefficient at a shorter time interval is used. In calculating the daily or monthly on-pressure error correction coefficients using the instantaneous on-pressure error correction coefficients calculated in this way, the arithmetic average of the instantaneous on-pressure error correction coefficients is automatically reflected in the city gas use or usage.

As another exemplary method of applying the weight, the on-pressure error correcting apparatus 10 detects whether the specific number wheel or the specific rotating needle of the meter 4 rotates, and determines whether the gas is currently in use. (50), the on-pressure error correction unit 30 is a specific number wheel or a specific rotary needle of the meter (4) by using the detection information provided by the gas flow detection unit 50 completes a predetermined number of rotations Information about the time interval between the time points is obtained, and the instantaneous on-pressure error correction coefficient is calculated based on the time interval. When the instantaneous on-pressure error correction coefficients thus calculated are simply arithmetic averaged to calculate the daily or monthly on-pressure error correction coefficients, the weighted values are automatically reflected in the calculated correction coefficients.

As another exemplary method of applying the weight, the on-pressure error correction device 10 detects the pressure difference between the orifice 252 installed inside the meter 4 or the gas pipe 2 and the front and rear points of the orifice 252. And a gas flow detector 50 having a differential pressure sensor 250 for generating an electrical signal corresponding thereto (the differential pressure sensor is conceptually shown in FIG. 11), and the on-pressure error correction unit 30 detects the gas flow. The detection information of the unit 50 is analyzed to determine whether city gas is currently in use, and when city gas is in use, a shorter time interval is applied as a calculation time interval of the instantaneous on-pressure error correction coefficient than when not in use. A method may be employed in which the weight is automatically reflected.

There may be other ways to detect whether city gas is currently in use for weighting. The first method is to detect whether the gas is flowing by detecting a pressure change in the gas pipe 2 using one pressure sensor. This method uses the principle that the static pressure is lowered due to the dynamic pressure generated when the fluid flows. To further reduce the static pressure, the gas pipe diameter at the point where the pressure is measured may be narrowed. The pressure measuring unit 25 may be used in combination without installing a separate pressure sensor. The second method is to use a temperature sensor. When the city gas is not used, the temperature of the city gas stagnated in the meter (4) or the gas pipe (2) and the city gas flowing out of the underground buried pipe when in use are There is a difference. This method can also use the temperature measurement part 20 without employing a separate temperature sensor. The third method is a method of measuring the displacement angle of the obstruction plate by installing a obstruction plate (not shown) in which the displacement angle varies depending on the flow amount of the city gas in the gas pipe 2. The fourth method is a specific number wheel or rotation on a meter that indicates the guide value of the meter (4) as a number on the number wheel train or a combination of the scale values indicated by several rotary needles. This method detects the use of city gas by detecting the rotation of the needle. The light emitting device and the light receiving device are installed to face a specific number wheel or a specific rotating needle. When the number wheel or rotating needle rotates, the intensity of the reflected light is changed by changing the shape of the number. Can be detected. In addition to such a light sensing method, magnetic sensing may be used.

On the other hand, the automatic meter reading device 100 having a pressure error correction function, as mentioned above, in addition to the on-pressure error correction unit 10 to automatically detect the guide value of the meter (4) to convert to a digitized meter reading value It has an automatic meter reading part 60. The automatic meter reading unit 60 is a signal processing function that is responsible for signal processing such as sensing the guide value of the meter (4) and converts it into a digitized reading value (value that is not subjected to error correction according to temperature or pressure change) Since having a function, any type of automatic meter reading device can be applied. The guide value sensing of the meter (4) is the optical automatic meter reading method using the optical sensor, the magnetic automatic meter reading method using the magnetic sensor, the acoustic automatic meter reading using the sound of the key, and after photographing the numerical value of the guide part Any of various types of automatic reading methods known in the art, such as an image reading type reading method that reads by a numerical value, may be adopted. For example, when the optical or magnetic meter reading method is adopted, a sensing unit for detecting rotation of a specific number wheel or a rotating needle, an AD converter for converting an analog signal output from the sensing unit into a digital value, and a converted digital value An arithmetic unit responsible for calculation and control such as acquiring and analyzing other change behaviors at its time and counting the number of revolutions of the specific number wheel or the rotating needle is required. When the CPU 32 of the on-pressure error correction unit 30 also serves as a calculation unit, the automatic meter reading unit 60 may be provided with a sensing unit and an AD converter for converting the output signal thereof into a digital signal.

3 and 4, according to a preferred embodiment of the present invention, shows an decomposition state and an installation state of an automatic meter reading device having an on-pressure error correction function and an optical automatic meter reading function, respectively. 5 is sectional drawing seen from the cutting line B-B of FIG. The illustrated meter 4 is a membrane type meter that measures the amount of city gas used in volume units, and the usage guide value is represented by the number value of the number wheel train 110. The temperature measuring unit 20 and the pressure measuring unit 25 are integrally combined with the gas pipe 2, and the gas pipe 2 is connected to the existing gas pipe 8 and the meter 4 using, for example, couplings 6a and 6b. ) Is hermetically coupled between.

The light sensing unit 130 for sensing whether or not the specific number wheel 112 of the number wheel train 110 of the meter 4 is rotated is a specific number wheel or a specific number indicating a digit below the meter effective digit of the meter 4. At least one light emitting element 312 for irradiating light to a specific region on the rotation path of the rotating needle, and at least one light receiving element 134 for receiving light reflected from the specific region and converting the light into a corresponding electric signal. . The output signal of the light receiving element 134 is AD converted by the AD conversion unit of the automatic meter reading unit 60 and then provided to the CPU 32. According to the actual embodiment shown in FIGS. 3 to 5, the light emitting element 132 and the light receiving element 134 are mounted on the body portion 135 of the hexahedron, for example, in front of the body portion 135 in a specific number wheel ( At least two grooves 138a and 138b having an opening directed to a specific area on the rotation path of 112 are formed, and the light emitting element 132 and the light receiving element 134 are respectively provided in the grooves 138b and 138b. The body portion 135 is fitted to the holder 148 of the inner wall of the installation space 142 of the housing 140, and in this state, the housing 140 covers the meter guide portion 114 while the latch 146 Is fastened to the flange portion 116. The housing 140 has a portion covering the meter guide portion 114 as a transparent window 144 so that the guide value can be easily seen. When the housing 140 is mounted on the meter 4, the light emitting device 132 and the light receiving device 134 of the light sensing unit 130 are seats below the effective reading place among the number wheels of the number wheel train 110. It is directed to a specific area on the rotation path of the specific number wheel 112 representing the value. In general, in the case of a gas meter used in Korea, a number from 0 to 9 is displayed in white on a black background on the outer surface of a specific number wheel 112. Since the reflection pattern of the light irradiated by the light emitting element 132 is different for each number, a change in the output signal of the light receiving element 134 that appears during one rotation of the specific number wheel 112 also corresponds to the figure. Therefore, the specific number wheel 112 rotates once by converting the output signal of the light receiving element 134 to AD and then providing it to the CPU 32 so that the CPU 32 analyzes the behavior of the level change of the output signal. It can be determined whether or not. Alternatively, the light reflecting portion 120 having a very good light reflecting efficiency is compressed on the outer surface of the number-specific number wheel 112 to determine whether the light reflecting portion 120 has passed under the light receiving element 134. It is possible to determine whether one rotation of the specific number wheel 112 is completed. That is, the outer surface of the specific number wheel 112 has a large difference in the light reflection efficiency between the light reflecting section 120 and the remaining section. When the light emitting element 132 irradiates light toward the specific number wheel 112 while the specific number wheel 112 rotates, the intensity of the reflected light by the light reflecting unit 120 depends on the intensity of the reflected light by the remaining sections. It is significantly stronger than that. Therefore, when the output signal of the light receiving element 134 for converting the intensity of the reflected light into the electric signal is AD converted and provided to the CPU 32, the CPU 32 analyzes the change behavior over time of the output level to determine a specific number wheel. The number of revolutions of the specific number wheel 112 is counted in such a manner as to determine whether the pattern 112 coincides with the pattern appearing upon completion of one revolution. For more information on how to count the number of revolutions of the specific number wheel 112 using the output signal of the light sensing unit 130, Korean Patent Publication No. 10-2005-0015110 (Invention: On-pressure for gas meter) Remote metering device with correction function), Korean Patent Publication No. 10-2005-0066073 (Invention: Remote metering method and device for measuring instrument using change pattern analysis of output signal of multiple photoelectric devices) Please.

6 shows an example of the configuration of the automatic meter reading unit 60 for the automatic automatic meter reading. As shown in FIG. 6, the acoustic automatic meter reading unit is attached to the latch 162 in a process in which the latch 162 fixed to the specific number wheel 112 and the specific number wheel 112 rotate, indicating a position below the effective digit of the meter reading. Sound that generates a specific sound every time the specific number wheel 112 rotates a predetermined angle, including the knobs 160a and 160b that generate the specific sound by vibration caused by its elastic force while being caught and bent. The generators 160a, 160b, 162, microphones 165a, 165b for converting sounds generated by the loudspeakers 160a, 160b into corresponding electric signals, and the analog electric signals provided by the microphones as digital signals. Has an arrangement including an AD converter (not shown) which is converted to and provided to the CPU 32.

Another example of the automatic meter reading unit 60, the automatic meter reading unit 60 for the magnetic automatic meter reading is characterized in that a magnet (not shown), such as the sound generating unit 160a of FIG. Magnetic sensors (not shown) disposed on the number wheel 112 or a specific rotary needle and outputting electric signals of different levels when the magnet approaches or exits within a predetermined distance are like the microphones 165a and 165b of FIG. 6. It is arranged at a specific point on the rotation path of the magnet, and has a configuration including an AD converter (not shown) which converts the analog electric signal provided by this magnetic sensor into a digital signal and provides it to the CPU 32.

In any of the above-mentioned methods, in order to determine whether a specific number wheel 112 or one rotation of the rotary needle is completed, it is necessary to perform a process of analyzing the change behavior of the digital signal over time. A separate signal processing device may be employed for this purpose, but in order to avoid duplication, the CPU 32 of the on-pressure compensating unit 30 preferably plays a role.

On the other hand, Figures 7 to 10 show an actual implementation of the on-pressure measuring unit including a temperature measuring unit 20 and the pressure measuring unit 25 of the on-pressure error correction device 10 according to the preferred embodiments of the present invention 4 are cross-sectional views taken along line AA of FIG. 4. The temperature measuring unit illustrated in FIG. 7 is a gas pipe member 2 which is coupled between the city gas supply pipe 8 and the city gas meter 4 and constitutes a part of the city gas supply pipe as an element for pressure measurement. The pressure pipe passage 242 fixed to the member 2 and having one end in communication with the gas pipe member and the other end terminated by a closed receiving cavity is formed, and the gas pipe member 2 is formed by screws 246a and 246b. Body parts (240, 244, 248) fixed to the pressure sensor 220, which is disposed in the receiving cavity of the body portion 240 and generates an electrical signal corresponding to the magnitude of the surrounding pressure, and the body portion It is arranged in the form of crossing the pressure line 242 in the middle of the pressure line 242 in the 240 to allow the pressure of the city gas in the gas pipe (2) to be transmitted to the pressure sensor 220, but the city gas is a pressure sensor ( Isolation such as, for example, membrane 224, which blocks direct contact with 220. It is disposed outside the body portion 240 and connected to the output terminal of the pressure sensor 220 and the wire 222 and converts the output electrical signal of the pressure sensor 220 into a digital signal corresponding to the pressure of the city gas It has a pressure signal processor 230. The usable pressure sensor is not particularly limited as long as it can convert the measured air pressure value into an electrical signal and provide it in the form of a digital value. For example, capacitive pressure sensors, strain gauge type pressure sensors, semiconductor resistance type pressure sensors, piezoelectric element type pressure sensors, and the like may be examples. In addition, the temperature measurement unit, a temperature sensor 210 which is installed inside or outside the gas pipe member 2 as an element for measuring the temperature and converts it into an electrical signal corresponding to the ambient temperature, and an output terminal of the temperature sensor 210; It is connected to the wire 212 and has a temperature signal processor 230 for processing the output electrical signal of the temperature sensor 210 to convert to a digital signal corresponding to the ambient temperature. FIG. 4 illustrates the pressure signal processor 230 and the temperature signal processor 230 on the same printed circuit board. O-rings 250 and 252 are mounted around the membrane 224 and the pressure sensor 220 to seal the city gas from leaking to the outside and to install the pressure sensor 220. The peripheral gap provided is finished with the sealing material 228. The temperature sensor that can be used may be one that can convert a temperature value into an electrical signal and output it, and examples thereof include a metal temperature resistor such as a thermocouple or platinum, a nonmetal temperature resistor (thermistor), a semiconductor temperature sensor, or a radial temperature sensor or metal And a core type temperature sensor.

8 and 9 is a configuration in which the means for blocking direct contact between the city gas in the gas pipe 2 and the pressure sensor 220 is further strengthened. In the case of FIG. 8, two membranes 250a and 250b sealed by O-rings 250a and 250b are disposed in the pressure line 242-1 formed in the body part 240. Between the 250b) is provided a U-shaped pressure line, the liquid material 226 is filled in the U-shaped pressure line. In order to fill the liquid material 226, a side of the body portion 240 is provided with a groove connected to a U-shaped pressure line, and the liquid material 226 is injected through the groove, and then closed with a stopper 244. The stopper 244 is sealed with a ring 254. 9 shows the case where the pressure line 242-2 is V-shaped. 8 and 9, only one of the membranes 250a and 250b and the liquid material 226 may be employed.

FIG. 10 shows the temperature measuring unit configured in the same manner as the temperature measuring unit but the pressure measuring unit in a different manner when compared with the above three temperature measuring units. Looking at the configuration of the pressure measuring unit, the inside of the body portion (240, 244, 248) one end is in communication with the gas pipe member 2, the other end is closed and at least a portion of the pressure pipe line 242-3 is formed upright In the upright section of the pressure line 242-3, the liquid material 254 is filled to a predetermined level, and the permanent magnet 248 placed on the float having the characteristic of floating on the liquid material 254 is disposed therein. . The liquid substance 254 has a characteristic in which the height of the liquid column changes in response to a change in the pressure in the gas pipe member 2. In addition, the magnetic field sensor 252 is disposed outside the body portion 240 at an approximately center height within the level variation range of the liquid material 254 corresponding to the expected pressure fluctuation range of the city gas in the gas pipe member 2. The magnetic field sensor 252 outputs an electric signal having a level corresponding to the strength of the magnetic field formed by the permanent magnet 248. The output electrical signal of the magnetic field sensor 252 is provided to the pressure signal processor 230 and converted into a digital signal corresponding to the pressure of the city gas. Liquid material 254 is sealed by a stopper 244 and the O-ring 254.

Next, the calculation of the city gas consumption with the correction of the on-pressure error is performed by the following procedure. First, the basic mode operation will be described. In real time, the CPU 32 may generate the instantaneous temperature T and the instantaneous temperature from the temperature measuring unit 20 and the pressure measuring unit 25 once, for example, once every 10 minutes. Obtain the pressure (P) information, calculate the on-pressure error correction coefficient (K _TP ) using Equation (1), and then the instantaneous _T / P / K _TP (Instantaneous _ temperature / pressure / correction coefficient) In the memory 34. At 24:00, the CPU 32 averages the 'instant_T / P / K _TP ' for 24 hours to calculate the 'daily average_T / P / K _TP ', and the 'daily average_T / P / K _TP 'is stored in memory 34 with the date. In addition, immediately calculate and store '1 month average_T / P / K _TP ' until the day. It has an average of the past one month on a daily basis, and when it is the end of each month, the 'one month average_T / P / K _TP ' based on the last day is converted to the 'monthly average_T / P / K _TP ' of the month. Are copied and stored separately in the memory 34. However, the 'Monthly Average_T / P / K _TP ' is updated daily. Here, the 'monthly average_T / P / K _TP ' is an average from one month before to the present (24:00), and the number of days in one month is based on the month to which the last day belongs. In other words, if the average is from February 3 to 24:00, one month is 28 days, so the 'average arithmetic average_T / P / K _TP ' for 28 days from January 7 to February 3 is To calculate. Repeat the above procedure. And when the user's instruction is given through the operation unit 80 performs the following special mode of operation in accordance with the instructions.

One special mode is the gas check mode. In this mode, the CPU 34 first checks whether gas is used by operating the gas flow detector 50 every 30 seconds after elapse of 0:00 minutes in real time. If a phenomenon in which the value of the output signal of the gas flow detection unit 50 differs from the previous value by a predetermined level or more occurs three times in succession, it is determined as 'gas in use'. If the gas is not in use, the CPU 32 generates the temperature T and the pressure (from the temperature measuring unit 20 and the pressure measuring unit 25 once in real time, for example, once every 60 minutes after elapse of 0:00 minutes in real time. P) is secured and the 'instant_T / P / K _TP ' is stored in the memory 34. If the "gas-use ', CPU (32) in real time to 0 in 00 minutes, after example, by securing once the temperature (T) and pressure (P) value every 6 minutes' time _T / P / K _TP' In the memory 34. While repeating such an operation, the CPU (32) calculates the 24: 00, "Instantaneous _T / P / K _TP '' Average _T / P / K _TP 'to the average for 24 hours. The method of calculating the average value arithmetic averages all the data of the day (no more than 10x24 = 240), regardless of whether the gas is in use. Since the sampling interval is 60 minutes: 6 minutes, the weight is automatically reflected. Even if gas is not used, the reason for reflecting the weight of 1/10 is to prepare for malfunction of 'check function during gas use'. Then, the CPU 32 keeps the 'daily average_T / P / K _TP ' with the date in the memory 34, as in the normal mode, immediately after the 'one month average_T' until the day. / P / K _TP 'is calculated and stored in the memory 34 as well. It has an average of the past one month on a daily basis, and when it is the end of each month, the 'one month average_T / P / K _TP ' based on the last day is converted to the 'monthly average_T / P / K _TP ' of the month. Copy to and store in memory 34 separately. However, the 'Monthly Average_T / P / K _TP ' is updated daily.

One special mode is gas usage mode. In this mode, the CPU 32 first checks whether gas is used by operating the gas flow detector 50 every two seconds after 0:00 minutes in real time. When the gas flow detecting unit 50 checks whether the gas is used by the light sensing method, the gas flow detecting unit 50 takes a method of confirming that the specific number wheel rotates one time. Whenever the number of revolutions of the specific number wheel rotates, for example, 1/2/4/8, the CPU 32 obtains the temperature (T) and pressure (P) values from the temperature measuring unit 20 and the pressure measuring unit 25. Obtain and store 'Instant_T / P / K _TP '. Subsequently, the CPU 32 averages the 'instantaneous_T / P / K _TP ' for 24 hours at 24 hours and calculates the 'daily average_T / P / K _TP ' and the 'daily usage' of the day. Calculate and store together. The average method is the arithmetic average of all the data of the day. The daily usage is kept together to use as a weight for the monthly average calculation. The CPU 32 stores the 'daily average_T / P / K _TP ' with the date in the memory 34, and immediately calculates the '1 month average_T / P / K _TP ' up to the corresponding day and then stores the memory again. Store at (34). 'Monthly average_T / P / K _TP ' is updated daily.

When the on-pressure error correction coefficient obtained through the operation modes as described above is reflected in the auto-reading value provided by the automatic meter reading unit 60, it is possible to calculate the amount of use for which the on-pressure error is corrected. The execution contents of each of these operation modes are prepared by a program and installed in advance in the on-pressure error correction unit 32. Usage information for which the pressure error has been corrected (automatic meter reading value before correction, temperature pressure error correction coefficient, corrected usage amount, etc.) is transmitted to the local wireless repeater 92 through the communication unit 90 together with each customer information, and the local wireless repeater ( 92 transmits the information collected from each customer in the area of charge to the city gas provider's computer 96 via the communication network 94.

The present invention described above can improve the adequacy and rationality of the rate gas billing by minimizing the amount of error in city gas sales generated by the difference in temperature or pressure. In particular, by measuring the temperature and pressure of the city gas at a point very close to each meter, there is an advantage that it is possible to correct the temperature error more accurate. In addition, by applying a weight corresponding to the use of city gas or the amount of use, a method of correcting the pressure error is made possible, which enables more accurate pressure error. As a result, consumer confidence in gas rates will be further increased.

Although the present invention has been described above according to an embodiment of the present invention, it will be apparent to those skilled in the art that various modifications may be made without departing from the spirit of the present invention.

Claims (25)

A temperature measuring unit for measuring a usage amount by volume unit and measuring a temperature of a city gas in a gas pipe adjacent to the meter and converting the temperature into an electric signal corresponding to the temperature value; A pressure measuring unit measuring the pressure of the city gas in the meter or the gas pipe and converting the pressure into an electric signal corresponding to the pressure value; And Every time interval or when the amount of use of the city gas reaches a predetermined value, an electric signal is received from the temperature measuring unit and the pressure measuring unit to obtain instantaneous temperature and instantaneous pressure values of the city gas. The instantaneous temperature value and the instantaneous pressure value are used to compensate for the meter reading error that may be included in the meter reading value due to the difference between the value and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when the city gas is supplied. And a temperature pressure error correction unit for calculating at least one of the instantaneous temperature error correction coefficient K _TP , the daily temperature pressure error correction coefficient, and the monthly temperature pressure error correction coefficient. 2. The apparatus of claim 1, wherein the instantaneous on-pressure error correction coefficient K _TP is calculated by the following equation, wherein P and T represent instantaneous pressure values and instantaneous temperature values, respectively.

The method of claim 1, wherein the daily on-pressure error correction coefficient is determined as an average value of the total instantaneous on-pressure error correction coefficients calculated on the day, and the monthly on-pressure error correction coefficient is the total instantaneous on-pressure error correction coefficient calculated on the current month or all Temperature pressure error correction device, characterized in that determined by the average value of the daily temperature error correction coefficients. The method according to any one of claims 1 to 3, wherein in calculating the daily on-pressure error correction coefficient or the monthly on-pressure error correction coefficient, whether city gas is used or used at the time of measuring temperature and pressure or during a measurement time period. Temperature pressure error correction device, characterized in that for applying a corresponding weight. The apparatus of claim 4, wherein the temperature error correction unit receives a digital daily or monthly guide value from an automatic meter reading device that automatically reads the guide value of the meter, and multiplies the daily guide value by the daily on-pressure error correction coefficient of the corresponding day. And calculating a monthly usage which is calculated by accumulating the daily usage and accumulating the daily usage by month, or multiplying the monthly guide value by the monthly on-pressure error correction coefficient of the corresponding month. Temperature pressure error correction device. 5. The method of claim 4, wherein the on-pressure error correcting unit analyzes a change pattern of the temperature value obtained from the temperature measuring unit over time or a change pattern of the pressure value obtained from the pressure measuring unit over time. It is further characterized by determining whether it is in use, and when the city gas is in use, by applying a shorter time interval as the value of the first time interval than when it is not in use, so that the weight is automatically reflected. Temperature pressure error correction device. According to claim 4, The temperature pressure error correction device further comprises a gas flow detection unit for determining whether the city gas is currently in use by detecting whether the specific number wheel or a specific rotary needle of the meter is rotated, The on-pressure error correcting unit applies the time interval between the time points at which the specific number wheel or the specific rotary needle completes the predetermined number of rotations as the first predetermined time interval based on the detection information of the gas flow detection unit. Temperature pressure error correction device, characterized in that it further comprises a function to be reflected by. The gas flow detector of claim 4, wherein the temperature pressure error correction device detects a pressure difference between an orifice installed in the meter or the gas pipe and a front and rear point of the orifice, and generates an electrical signal corresponding thereto. Further, the on-pressure error correction unit analyzes the detection information of the gas flow detection unit to determine whether the city gas is currently in use, when the city gas is in use, the shorter time interval than the non-use when the second Temperature pressure error correction device further comprises a function to automatically reflect the weight by applying a value of one time interval. According to claim 1, wherein the pressure measuring unit is coupled between the city gas supply pipe and the city gas meter gas pipe member constituting a part of the city gas supply pipe; A body part fixed to the gas pipe member and having a pressure passage formed therein, one end of which is in communication with the gas pipe member and the other end of which is terminated by a closed storage cavity; A pressure sensor disposed in the accommodation cavity of the body and generating an electrical signal corresponding to the magnitude of the pressure around the body; Isolating means disposed in the middle of the pressure pipe in the body portion to allow the pressure of the city gas in the gas pipe to be transmitted to the pressure sensor but to prevent the city gas from coming into direct contact with the pressure sensor; And a pressure signal processor disposed outside the body and electrically connected to an output end of the pressure sensor, and configured to process an output electrical signal of the pressure sensor and convert the output electrical signal into a digital signal corresponding to the pressure of the city gas. Temperature pressure error correction device. 10. The liquid crystal of claim 9, wherein the isolation means comprises at least one membrane disposed in a shape crossing the pressure line at a predetermined point of the pressure line, and a liquid filled at a predetermined height in a U-shaped or V-shaped line of the pressure line. Temperature pressure error correction device, characterized in that at least one of the materials. The temperature sensor of claim 9, wherein the temperature measuring part is installed inside or outside the gas pipe member and is converted into an electrical signal corresponding to an ambient temperature, and is electrically connected to an output terminal of the temperature sensor. And a temperature signal processing unit configured to process a digital signal corresponding to the ambient temperature. According to claim 1, wherein the pressure measuring unit is coupled between the city gas supply pipe and the city gas meter gas pipe member constituting a part of the city gas supply pipe; A body part fixed to the gas pipe member and having one end communicating with the gas pipe member, an opposite end being closed, and at least a portion of the pressure pipe having an upright portion; A liquid substance filled up to a predetermined level of the upright section of the pressure pipe and having a height of the liquid column corresponding to a change in the pressure in the gas pipe; The permanent magnet is placed on the float having the characteristics of floating in the liquid material and located at approximately the middle height within the level fluctuation range of the liquid material corresponding to the expected pressure fluctuation range of the city gas in the gas pipe, which is installed outside the body part. A pressure sensor unit for outputting an electric signal corresponding to the magnitude of the pressure of the city gas, including a magnetic field sensor for outputting an electric signal having a level corresponding to the strength of the magnetic field formed by the permanent magnet; And a pressure signal processing unit for converting the output electrical signal of the pressure sensor unit into a digital signal corresponding to the pressure of the city gas. The apparatus of claim 4, wherein the on-pressure error correcting unit is connected to the central processing unit to perform a calculation necessary for calculating the on-pressure error correction coefficient and calculating a corrected gas consumption amount using the same. And a memory for providing a data storage space, and a time measurement unit connected to the central processing unit to count a current time and provide the information to the central processing unit. 14. The apparatus of claim 13, wherein the on-pressure error correcting unit further comprises a display unit connected to the central processing unit to display various pieces of information obtained or calculated by the central processing unit. An automatic meter reading unit for automatically converting the guide value of the city gas usage displayed on the number plate or the scale plate of the capacity type city gas meter for reading the usage amount of the city gas into a corresponding digital guide value; A temperature measuring unit measuring the temperature of the city gas in the meter or a gas pipe adjacent thereto and converting the temperature into an electric signal corresponding to the temperature value; A pressure measuring unit measuring the pressure of the city gas in the meter or a gas pipe adjacent thereto and converting the pressure into an electric signal corresponding to the pressure value; And Every time interval or when the amount of use of the city gas reaches a predetermined value, an electric signal is received from the temperature measuring unit and the pressure measuring unit to obtain instantaneous temperature and instantaneous pressure values of the city gas. The instantaneous temperature value and the instantaneous pressure value are used to compensate for the meter reading error that may be included in the meter reading value due to the difference between the value and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when the city gas is supplied. By calculating at least one of the instantaneous on-temperature error correction coefficient K _TP , the daily on-pressure error correction coefficient and the monthly on-pressure error correction coefficient, and receives the daily or monthly digital guide value from the automatic meter reading means corresponding to the daily guide value Daily or monthly correction, multiplied by the daily on-pressure error correction factor or the monthly on-pressure error correction factor for the month With a pressure error correction unit for calculating the amount of use, Automatic metering function, characterized in that compensation for the amount of meter reading error that can be included in the metering value of the capacitive city gas meter due to the difference between the instantaneous temperature value and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when the city gas supply Temperature pressure error correction device for a capacitive type city gas meter. The method of claim 15, wherein the instantaneous on-temperature error correction coefficient K _TP is calculated by the following equation, wherein P and T represent the instantaneous pressure value and the instantaneous temperature value, respectively, the daily on-pressure error correction coefficient is calculated on the day The automatic instantaneous meter reading function is determined by the average value of the total instantaneous temperature error correction coefficients, and the monthly on-pressure error correction coefficient is determined by the average value of the total instantaneous temperature error correction coefficients calculated in the month or the total daily pressure error correction coefficients. Temperature pressure error correction device for a capacitive type city gas meter.

The method according to claim 15, wherein the temperature error correction unit calculates the daily temperature error correction coefficient or the monthly temperature error correction coefficient to correspond to the use or use of city gas at the time of measuring temperature and pressure or during a measurement period. Temperature pressure error correction device for a capacitive city gas meter having an automatic metering function, characterized in that by applying a weight. 18. The apparatus of any one of claims 15 to 17, wherein the automatic meter reading unit comprises: one or more light emitting devices for irradiating light to a specific number wheel or a rotation region of a specific rotary needle indicating a digit below the effective digit of the meter; One or more light receiving elements for receiving the light reflected from the rotation region and converting the light into a corresponding electric signal, and analyzing the change behavior of the electric signal provided by the light receiving element with time, wherein the number wheel or the rotating needle is 1; Correction of the temperature pressure error for a capacitive city gas meter with an automatic meter reading function, characterized in that it comprises a rotation speed counting unit for counting the rotation speed of the specific number wheel or the specific rotation needle in a manner of determining whether the rotation is completed. Device. 18. The magnet as claimed in any one of claims 15 to 17, wherein the automatic meter reading unit is disposed at a specific number wheel or a specific rotating needle that indicates a position below the effective digit of the meter, and at a specific point on the rotation path of the magnet. And a magnetic sensor for outputting an electrical signal having a different level when the magnet approaches or leaves within a predetermined distance, and analyzes the change behavior of the electrical signal provided by the magnetic sensor with respect to time. For a capacitive city gas meter having an automatic meter reading function, characterized in that it has a rotation counting unit for counting the number of revolutions of the specific number wheel or the specific rotation needle in a manner to determine whether the one rotation has been completed Temperature pressure error compensation device. 18. The apparatus according to any one of claims 15 to 17, wherein the automatic meter reading unit generates a specific sound each time a specific number wheel or a specific rotary needle rotates one revolution indicating a digit or less, and the sound And a rotation speed counting means for counting the number of revolutions of the specific number wheel or the specific rotation needle by detecting the sound generated by the generating means and determining that the specific number wheel or the specific rotation needle has made one rotation. Temperature pressure error correction device for capacitive city gas meter having an automatic meter reading function, characterized in that. 18. The apparatus according to any one of claims 15 to 17, further comprising a communication unit which receives the corrected amount of usage information from the on-pressure error correction unit and transmits the meter information together with the installed customer information to a predetermined destination. Temperature pressure error correction device for capacitive city gas meter with meter reading function. The gas supply system of claim 15, wherein the pressure measuring unit comprises: a gas pipe member coupled between the city gas supply pipe and the city gas meter to form a part of the city gas supply pipe; A body part fixed to the gas pipe member and having a pressure passage formed therein, one end of which is in communication with the gas pipe member and the other end of which is terminated by a closed storage cavity; A pressure sensor disposed in the accommodation cavity of the body and generating an electrical signal corresponding to the magnitude of the pressure around the body; Isolating means disposed in the middle of the pressure pipe in the body portion to allow the pressure of the city gas in the gas pipe to be transmitted to the pressure sensor but to prevent the city gas from coming into direct contact with the pressure sensor; And a pressure signal processor disposed outside the body and electrically connected to an output end of the pressure sensor, and configured to process an output electrical signal of the pressure sensor and convert the output electrical signal into a digital signal corresponding to the pressure of the city gas. Temperature pressure error correction device for capacitive city gas meter with automatic meter reading function. The liquid phase of claim 22, wherein the isolating means comprises at least one membrane disposed in a form crossing the pressure line at a predetermined point of the pressure line, and a liquid filled at a predetermined height in a U-shaped or V-shaped line of the pressure line. Temperature pressure error correction device for a capacitive city gas meter having an automatic metering function, characterized in that at least one of the substances. The temperature sensor of claim 22, wherein the temperature measuring part is installed inside or outside the gas pipe member and is converted into an electrical signal corresponding to an ambient temperature, and is electrically connected to an output terminal of the temperature sensor. And a temperature signal processing unit for converting the signal into a digital signal corresponding to the ambient temperature. The gas supply system of claim 15, wherein the pressure measuring unit comprises: a gas pipe member coupled between the city gas supply pipe and the city gas meter to form a part of the city gas supply pipe; A body part fixed to the gas pipe member and having one end communicating with the gas pipe member, an opposite end being closed, and at least a portion of the pressure pipe having an upright portion; A liquid substance filled up to a predetermined level of the upright section of the pressure pipe and having a height of the liquid column corresponding to a change in the pressure in the gas pipe; The permanent magnet is placed on the float having the characteristics of floating in the liquid material and located at approximately the middle height within the level fluctuation range of the liquid material corresponding to the expected pressure fluctuation range of the city gas in the gas pipe, which is installed outside the body part. A pressure sensor unit for outputting an electric signal corresponding to the magnitude of the pressure of the city gas, including a magnetic field sensor for outputting an electric signal having a level corresponding to the strength of the magnetic field formed by the permanent magnet; And a pressure signal processing unit for converting the output electrical signal of the pressure sensor unit into a digital signal corresponding to the pressure of the city gas.

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