JPH07243599A - Fine gas leakage detector - Google Patents

Abstract

PURPOSE:To measure an accurate flow rate and judge gas leakage more precisely. CONSTITUTION:A fine gas leakage detector comprises a flow rate detector for detecting a flow rate of gas flowing in gas supply pipes 2, 8 for feeding the gas from a gas supply source 1 toward a combustor, meteorological condition detectors 29, 30 for detecting at least either one of an outside atmospheric temperature and an outside atmospheric pressure, and a corrector for correcting the flow rate detected by the flow rate detector on the basis of at least either one of the temperature and pressure detected by the meteorological condition detectors 29, 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas micro-leakage detector for detecting gas micro-leakage in a gas supply system in which a gas supply source and a combustor are connected by a gas supply pipe.

[0002]

2. Description of the Related Art FIG. 11 is an overall configuration diagram showing a configuration of a gas supply system using a conventional gas micro leak detection device. When supplying LP gas to a condominium such as a condominium, a method is adopted in which LP gas containers 1 are centrally installed at one location and distributed to each household by a gas supply pipe 2 buried underground. The gas supply pipe 2 buried in the ground is
Since a crack may occur due to a load from the surface of the earth or corrosion, it is necessary to detect a gas leak in the gas supply pipe 2 from the LP gas container 1 to the house.

In the figure, in detecting gas leakage in the gas supply pipe 2, another pressure regulator 7 is provided in parallel with the pressure regulator 6 after the original pressure regulator 5, and these two pressure regulators 6, 7 are provided. And a bypass flow path 8 connected to the outlet side of the pressure regulator 7 on the child side is provided with a minute flow rate detection device 9 capable of detecting a minute flow rate (for example, 6 liters / hour). The one provided is proposed by the applicant.

In such a parent-child type pressure adjuster, the adjusting pressure of the child side pressure adjuster 7 is set higher than the adjusting pressure of the parent side pressure adjuster 6 by, for example, 20 mmH ₂ O (underwater pressure). deep. As a result, since the pressure of the gas supply pipe 2 is low during the daytime, the gas is supplied through both pressure regulators 6 and 7, while the amount of the gas used is reduced at night, so The pressure increases, approaches the adjusted pressure of the pressure regulator 7 on the child side, the pressure regulator 6 on the parent side is closed, and all the gas is supplied via the minute flow rate detection device 9 provided in the bypass path 8. Will be done.

That is, when the flow rate becomes extremely small, such as at midnight when measuring, the gas supply path is automatically switched to only the bypass path 8 and is supplied through the minute flow rate detection device 9. When the flow rate measured by the minute flow rate detector 9 is continuous for a long period of time, for example, 720 hours (30 days), it is determined that there is a possibility of minute leakage and an alarm is issued.

[0006]

By the way, in the above-mentioned conventional gas leak detection device, the gas leak is judged only by recording the flow rate. However, in the above-described gas supply system, the gas pressure in the LP gas container 1 and the gas supply pipes 2 and 8 changes due to changes in the outside temperature and atmospheric pressure. That is, the product of pressure and volume is
Since it is constant (PV = constant) according to Boyle's law, the initial atmospheric pressure × V1 = the changed atmospheric pressure × V2. In addition, V
1 is the initial volume and V2 is the changed volume. From the above equation, the generated flow rate caused by the change in atmospheric pressure is V2 = V
1 and the generated flow rate caused by temperature change is {(1
/ 273) × Δt} × V1.

In particular, depending on the pipe diameter or the length of the pipe on the downstream side of the gas micro-leakage detecting device 9, there is a problem that the influence of the air temperature and the atmospheric pressure is large and an erroneous determination may occur. . For example, in reality, if there is a gas leak and the pipe is warmed due to the influence of the temperature, the gas temperature rises and expands, so that a reverse flow rate occurs, and the flow rate is apparently not recorded. , Or less than the actual flow rate. Also, the rise in atmospheric pressure,
When the supply pressure of the pressure regulator changes due to the descent, the gas pressure in the pipe also changes, so the flow rate is detected by the gas micro-leakage detection device, and there is a problem that a gas leak is erroneously determined.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas micro leak detection device capable of measuring an accurate flow rate and making a more accurate gas leak determination.

[0009]

In order to solve the above-mentioned problems, in the invention according to claim 1, at a predetermined time interval,
Flow rate detection means for detecting the flow rate of gas flowing in the gas supply pipe for transferring gas from the gas supply source to the combustor, temperature detection means for detecting the outside air temperature, pressure detection means for detecting the outside air pressure, and the temperature detection Based on the temperature detected by the means and the atmospheric pressure detected by the pressure detection means,
And a correction unit that corrects the flow rate detected by the flow rate detection unit.

Further, according to the invention described in claim 2, the correction means uses the temperature detected by the temperature detection means a predetermined time before as the correction data at the present time.

The invention according to claim 3 is characterized by further comprising output means for outputting the flow rate value corrected by the correction means at each measurement time.

Further, in the invention according to claim 4, at a predetermined time interval, a flow rate detecting means for detecting a flow rate of the gas flowing in the gas supply pipe for transferring the gas from the gas supply source to the combustor, and an outside air temperature are detected. The temperature detecting means, the pressure detecting means for detecting the outside atmospheric pressure, the temperature reading interval setting means for setting the outside air temperature detecting interval by the temperature detecting means, and the detection interval set for the temperature reading interval setting means. It is characterized by further comprising storage means for sequentially storing the temperature detected by the temperature detection means, the pressure detected by the pressure detection means, and the flow rate detected by the flow rate detection means.

Further, the invention according to claim 5 is characterized by comprising output means for outputting the flow rate value, the temperature, and the atmospheric pressure stored in the storage means at each measurement time.

According to the invention of claim 6, the flow rate detecting means for detecting the flow rate of the gas flowing through the gas supply pipe for transferring the gas from the gas supply source to the combustor and the outside air temperature are detected at predetermined time intervals. Temperature detecting means, pressure detecting means for detecting the outside air pressure, temperature reading interval setting means for setting the detection interval of the outside air temperature by the temperature detecting means, at least the volume of the gas supply pipe, the buried pipe and the exposure pipe. The pipe volume level setting means for setting a volume level consisting of, and the temperature detected by the temperature detecting means at the detection intervals set by the temperature reading interval setting means, and the pressure detecting means. And a correction unit for correcting the flow rate detected by the flow rate detection unit based on the pressure level set in the pipe volume level setting unit and the volume level set in the pipe volume level setting unit. And butterflies.

[0015]

In the present invention, the flow rate detecting means detects the flow rate of the gas flowing in the gas supply pipe for transferring the gas from the gas supply source to the combustor, and the weather condition detecting means detects at least one of the outside air temperature and the outside air pressure. Detect one. Then, the correction means corrects the flow rate based on at least one of the temperature and the atmospheric pressure. Therefore, the accurate flow rate can be measured, and more accurate gas leakage determination can be performed.

[0016]

Embodiments of the present invention will now be described with reference to the drawings.

1. First Embodiment Configuration FIG. 1 is an overall configuration diagram showing a configuration of a gas supply system using a gas minute flow rate detection device according to a first embodiment of the present invention. Note that, in the figure, the portions corresponding to those in FIG. Reference numeral 20 is a gas minute flow rate detector that measures the gas flow rate at predetermined time intervals,
The detected flow rate value is corrected according to the temperature and the atmospheric pressure obtained by the pressure sensor 29 and the temperature sensor 30 which constitute the weather condition detecting means described later.

Here, FIG. 2 is a block diagram showing the structure of the above-mentioned minute gas flow rate detecting device 20. In the figure, 2
Reference numeral 1 denotes a flow rate sensor, which detects the flow rate of the gas flowing through the bypass path 8 and outputs a pulse signal having a cycle corresponding to the flow rate. Further, reference numeral 22 is a shutoff valve, which is inserted in the bypass path 8 shown in FIG. 1 so as to be confined in the event of any abnormality.

Next, 23 is a microcomputer, which is composed of a ROM in which a program for controlling the entire apparatus is stored, and a RAM used as a data storage area such as a register (not shown).
The microcomputer 23 is operated by a battery 24, receives the pulse signal from the flow rate sensor 21 via the interface 25, and drives the shutoff valve 22 to open and close under a predetermined condition. It is supposed to do.

Further, the microcomputer 23 is
An NCU (telephone line control unit) 27 connected to a terminal block 26 via an interface 25 and an external device 2
8 is connected to. The NCU 27 is connected to a telephone line (not shown) and is for automatically transmitting a gas flow rate, a gas leak, and other abnormalities to a center (not shown).

Next, the pressure sensor 29 constituting the weather condition detecting means measures the external atmospheric pressure and supplies it to the microcomputer 23 via the interface 25. Further, the temperature sensor 30 constituting the weather condition detecting means measures the outside air temperature and supplies it to the microcomputer 23 via the interface 25. That is, the microcomputer 23 measures the flow rate of the gas flowing through the bypass path 8 according to the pulse signal from the flow rate sensor 21, and corrects the flow rate value according to the atmospheric pressure and the temperature.

2. RAM Data Format Next, the data stored in the RAM of the microcomputer 23 described above will be described. FIG. 3 is a conceptual diagram showing the data in the RAM. In the figure, the RAM stores time Tb, Td, T at which data is stored at predetermined time intervals.
f and the temperatures TTa, TTb, and
, TTz, atmospheric pressures Pa, Pb, ..., Pz, and corrected flow rates FRa, FRb, ..., FRz are sequentially stored. When the outside air temperature changes, there is a delay due to the diameter of the pipe, the length of the pipe, and the like until the influence on the pipe or the like appears. There is a gap in the timing of flow rate detection. That is, regarding the temperature used for the correction, the temperature data before the predetermined time is used in consideration of the delay. At this time, it is possible to set in advance how much the temperature data should be.

3. Operation of First Embodiment Next, the operation of the above-described first embodiment will be described.
FIG. 4 is a flow chart of the main routine of the first embodiment. When the power is turned on or reset, the microcomputer 23 shown in FIG. 2 executes the main routine. First, in step S10,
As described above, the time set value that determines how much previous temperature data is read is read. Next, step S12
At, the ambient temperature is read by the temperature sensor 30 and stored in the buffer memory described above. Next, step S1
4, the atmospheric pressure is read by the pressure sensor 29 and stored in the buffer memory. This buffer memory stores the latest one hour's worth of data and sequentially erases the data before one hour. Then, step S16
In, the flow rate calculation processing shown in FIG. 5 is executed.

In FIG. 5, first, step S50.
Then, the pulse signal from the flow rate sensor 21 is counted.
Then, in step S52, it is determined whether 10 minutes have elapsed. Here, if 10 minutes have not elapsed, the determination result in step S52 becomes "NO", the flow rate calculation process is exited, and the process returns to the main routine. In the main routine, steps S18, S20, S
Proceed to 22.

On the other hand, after 10 minutes, step S52
The determination result in step S54 is “YES”, and step S54
Go to. In step S54, an actual flow rate value, in other words, a flow rate value including an error is obtained by calculating the counter value of the pulse signal, and is stored in the RAM together with the temperature data and the atmospheric pressure data stored in the buffer memory. Next, in step S56, according to the set value read in step S10 of the main routine,
The flow rate value is corrected based on the temperature data and the atmospheric pressure data before a predetermined time.

The correction of the flow rate value is obtained by the following equation.

[0027]

## EQU1 ## Flow rate TF due to temperature change = (measured value of temperature change by temperature sensor, measurement time interval) × correction coefficient a × pipe volume V (1)

## EQU00002 ## Flow rate PF due to atmospheric pressure change = (measured value of atmospheric pressure change by pressure sensor / measurement time interval) × correction coefficient b × pipe volume V (2)

## EQU00003 ## Corrected flow rate FR = flow rate TF + flow rate PF + flow rate F by flow sensor (3) Here, the temperature, atmospheric pressure, and the timing of taking in the flow rate will be described with reference to FIG. FIG. 6 is a timing chart showing the elapsed time in the vertical direction and the state of taking in from each sensor in the horizontal direction. In the figure, the measurement time is Ta, T by the built-in clock of the microcomputer 23.
b, Tc, Td, Te, Tf, ... are sequentially timed at predetermined intervals. First, at time Ta by the clock, the temperature TTa is fetched from the temperature sensor 21 and stored in the buffer memory.

Next, at time Tb, the pressure sensor 29
Atmospheric pressure Pa is fetched from and stored in the buffer memory, and the flow rate F is generated by the pulse signal of the flow rate sensor 21.
a is captured. Then, at time Tc, the temperature TTb is fetched from the temperature sensor 21 and stored in the buffer memory. Then, at time Td, the atmospheric pressure Pb is fetched from the pressure sensor 29, stored in the buffer memory, and the flow rate Fb is fetched from the flow rate sensor 21.

At this time Td, the time Ta
At temperature Tb, pressure Pa and flow rate Fa at time Tb, temperature TTb at time Tc, and time T
The corrected flow rate FRb is obtained according to the atmospheric pressure Pb and the flow rate Fb at d. That is, first, the correction flow rate FRb ′ due to temperature is

## EQU00004 ## FRb '= {(TTa-TTb) / (Tc-Ta)} * a * V is calculated, and the corrected flow rate FRB' 'according to atmospheric pressure is calculated.

## EQU5 ## FRB ″ = {(Pa−Pb) / (Td−Tb)} × a × V.

Next, the corrected flow rate FRb is calculated as FRb = FRb '+ FRb''+ Fb. As shown in FIG. 3, the corrected flow rate FRb is R along with the time Td, the temperature TTb, and the atmospheric pressure Pb.
Stored in AM. Note that the temperature data used for correction is shifted by one time slot, as described above, when the outside air temperature changes, the pipe diameter and This is because the delay may occur due to the length or the like.

Similarly, at time Te,
The temperature TTc is fetched from the temperature sensor 21 and stored in the buffer memory. At time Tf, the pressure sensor 2
The atmospheric pressure Pc is fetched from 9 and stored in the buffer memory, and the flow rate Fc is fetched from the flow rate sensor 21.

At the same time Td, the temperature TTb at time Tc, the atmospheric pressure Pb and the flow rate Fb at time Td, the temperature TTc at time Te, and the time Tf.
The corrected flow rate FRc is obtained according to the atmospheric pressure Pc and the flow rate Fc at. Then, these data are R as the time Tf, the temperature TTc, the atmospheric pressure Pc, and the correction flow rate FRc.
Stored in AM.

In this way, when the flow rate calculation process is completed,
The process proceeds to step S18 of the main routine. Step S1
8, the correction flow rates FRa, FRb stored in the RAM,
By referring to ..., it is determined whether or not gas leakage has occurred. First, it is determined whether or not there is no day on which a flow rate value of less than or equal to a predetermined value has been recorded for 30 days. Then, even if it is one day, it is determined that the gas leakage has not occurred, and the leakage determination process ends. On the other hand, if there is no day in which the flow rate value is recorded below the predetermined flow rate value for 30 days, an alarm or a notification request is issued and the leakage determination process is ended.

Next, in step S20, if the above-mentioned alarm request or notification request is issued, the notification is sent to the center via a telephone line, or an alarm provided in the gas leakage detection device 20. The alarm is issued by the vessel. Then, in step S22, data output processing is performed. In this data output process, it is determined whether or not there is a data output request, and if the output request is made by a worker at the center or the site, whether the data stored in the RAM is printed out on the recording paper. , Or send to the center via telephone line. Here, an output example of data is shown in FIG. In the figure, the measurement time zone, the corrected flow rate value at that time, and its bar graph are output. Then, the output data is cleared and the process ends.

4. Second Embodiment Next, FIG. 8 is a block diagram showing the configuration of the second embodiment of the present invention. Note that the portions corresponding to those in FIG. In the figure, the second embodiment is different from the above-described first embodiment in that a gas minute leak detection device 20 is provided with a temperature reading time setting device 31 via an interface 25. The temperature reading time setting device 31 is provided 3 hours before the predetermined time of the flow rate detection described above.
It is possible to set a predetermined time when the temperature data of 0 is taken in. For example, a toggle switch or
It is composed of switch means such as a DIP switch or numeric value input means such as a numeric keypad.

In the above-mentioned configuration, the temperature reading time setting unit 31 is set in advance as to how many minutes before the flow rate detection the temperature data is taken. And the above-mentioned first
By the same processing as in the embodiment of the above, the time T,
The temperature TT, the atmospheric pressure P, and the flow rate F are stored, but in the second embodiment, the corrected flow rate FR is not calculated, and the flow rate F that is the actual measurement value of the flow rate sensor 21 is stored. At this time,
As the temperature data, data before the time set by the temperature reading time setting device 31 is recorded together with the flow rate and the atmospheric pressure.
Then, gas leakage is judged based on these data.

In the second embodiment, the recorder 1
When data is printed out on the recording paper 11 by 0, as shown in FIG. 9, in addition to the flow rate value, temperature and atmospheric pressure are printed as a bar graph together with numerical data. The flow rate shown in the figure is the flow rate F which is the actual measurement value of the flow rate sensor 21, as described above. Therefore, the operator can know the change in temperature or the change in atmospheric pressure from the output shown in FIG. 9, and the flow rate F
You can see how changes in.

5. Third Embodiment Next, FIG. 10 is a block diagram showing the configuration of the third embodiment of the present invention. The parts corresponding to those in FIG. 2 or 8 are designated by the same reference numerals and the description thereof will be omitted. In the figure, the third embodiment is different from the first embodiment described above in that the gas micro-leakage detection device 20 is further provided with a pipe volume level setter 32 via an interface 25. . This pipe volume level setter 32 is
The volume of the pipe 2 and the ratio of the buried pipe to the exposed pipe can be set in advance. For example, a toggle switch or
It is composed of switch means such as a DIP switch or numeric value input means such as a numeric keypad.

The volume of these pipes and the ratio of the buried pipe to the exposed pipe are determined by the scale of the apartment house in which the gas supply system is installed. Different effects on temperature.
Therefore, in the third embodiment, the volume of the pipe and the ratio of the buried pipe to the exposed pipe can be set, and the corrected flow rate is calculated more accurately based on these settings. The relationship between the volume of the pipe, the ratio of the buried pipe to the exposed pipe, and the gas flow rate is expressed by the following equation.

[0040]

ΔW = V ′ × {(1000 × M) /22.4} × (P / P ₀ ) × (T ₀ / T) × ΔT (4) ΔW: Gas flow rate (g / h) ΔT : Change of gas temperature (° C / h) V ': Apparent pipe volume (m ³ ) P: Pipe gas pressure (mmH ₂ O Abs) T: Pipe gas temperature (K) P ₀ : Standard pressure = 10,342 ( mmH ₂ O) T ₀ : standard temperature = 0 ° C. = 273K M: molecular weight of propane The apparent pipe volume is represented by the following formula.

V ′ = buried pipe volume × 0.1 + exposed pipe volume (5) 0.1 = ratio of soil temperature change to outside air temperature change per unit time In case of low pressure supply, Is approximated by

[0042]

ΔW = V ′ × {(1000 × 44.1) /22.4× {(10342 + 325) / 10342} × (273/283) × 1/283 = 6.92V ′ (6) As described above In the configuration, the pipe volume level setter 32 sets the pipe volume and the ratio of the buried pipe to the exposed pipe. Then, the time T, the temperature TT, the atmospheric pressure P, and the corrected flow rate FR are sequentially stored in the RAM by the same processing as that of the first embodiment described above. At this time, as the temperature data, the data before the time set in the temperature reading time set value 31 is fetched, and the correction flow rate FR is described in (1) above.
To (3) and (5).
Then, gas leakage is judged based on these data.

The second embodiment is also used in the third embodiment.
Similarly to the embodiment described above, the corrected flow rate FR may not be calculated, and the flow rate F that is the actual measurement value of the flow rate sensor 21 may be stored. In the third embodiment, when the data is printed out on the recording paper 11 by the recorder 10, the data is printed in the print format shown in FIG. 7 or 9.

In the above-described embodiment, the data stored in the RAM is output as the printout on the recording paper 11 or the transfer to the center by the telephone line. However, the present invention is not limited to this, and the amount of gas is very small. A connector (including an interface) for connecting a handy terminal (portable computer) to the leak detection device 20, or an IC
An IC card slot (including an interface) for mounting a card may be provided to transfer the above data.

Further, in the above-mentioned embodiment, the flow rate is corrected by both the change amount of the temperature and the atmospheric pressure. However, depending on the situation of the supply equipment, only the temperature or the atmospheric pressure is measured and the flow rate is changed. The correction and the recording of the temperature and the atmospheric pressure may be performed.

Further, in the above-mentioned embodiment, the interval of flow rate detection is set to 10 minutes, but the interval is not limited to this and may be determined according to the flow rate value to be measured.

Further, in the above-mentioned embodiment, the gas minute leak detection device 20 is provided with the control means such as a microcomputer, but it may be incorporated in the recorder 10.

[0048]

As described above, according to the first aspect of the invention, the flow rate detecting means for detecting the flow rate of the gas flowing in the gas supply pipe for transferring the gas from the gas supply source to the combustor, and the outside Meteorological condition detecting means for detecting at least one of air temperature and atmospheric pressure, and flow rate detected by the flow rate detecting means based on at least one of temperature and atmospheric pressure detected by the meteorological condition detecting means Since it is equipped with a correction means for correcting the above, it is possible to obtain an advantage that an accurate flow rate can be measured and more accurate gas leakage determination can be performed without being affected by the outside air temperature and the outside air pressure. .

According to the second aspect of the invention, the correction means uses the temperature detected by the meteorological condition detection means a predetermined time before as the correction data at the present time. Since it can be corrected according to the delay time propagated to the temperature,
There is an advantage that an accurate flow rate can be measured and more accurate gas leakage determination can be performed without being affected by the external atmospheric pressure.

According to the third aspect of the invention, since the output means for outputting the flow rate value corrected by the correction means at each measurement time is provided, it is influenced by the outside air temperature and the outside air pressure. Without this, it is possible to obtain an advantage that an accurate flow rate can be measured and a more accurate gas leakage determination can be performed.

According to the fourth aspect of the invention, flow rate detecting means for detecting the flow rate of the gas flowing in the gas supply pipe for transferring the gas from the gas supply source to the combustor, and at least one of the outside air temperature and the outside air pressure. A meteorological condition detecting means for detecting one of them, a first predetermined time interval, at least one of temperature and atmospheric pressure detected by the meteorological condition detecting means, and a flow rate detected by the flow rate detecting means. Since the storage means for sequentially storing is provided, it can be corrected according to the delay time propagated to the gas temperature of the outside air temperature, and further, without being affected by the outside air temperature or the outside air pressure,
This has the advantage that an accurate flow rate can be measured and a more accurate gas leakage determination can be performed.

Further, according to the invention of claim 5, the temperature detected at the second predetermined time before the flow rate is measured is stored together with the flow rate, so that the temperature is propagated to the gas temperature of the outside temperature. The advantage is that an accurate leak judgment can be made in consideration of the delay time that occurs.

According to the sixth aspect of the invention, since the temperature reading time setting means for setting the second predetermined time is provided, the second predetermined time is set to the pipe diameter, thickness volume, etc. The advantage is that it can be set arbitrarily according to

Further, in the invention according to claim 7, since the output means for outputting to at least one of the flow rate value, the temperature and the atmospheric pressure stored in the storage means is provided, the outside air temperature, This has the advantage that the degree of influence of changes in the external atmospheric pressure can be quickly grasped, and more accurate gas leakage determination can be made.

According to the present invention, the flow rate detecting means for detecting the flow rate of the gas flowing in the gas supply pipe for transferring the gas from the gas supply source to the combustor, and at least one of the outside air temperature and the outside air pressure. At least one of meteorological condition detecting means for detecting one, a pipe volume level setting means for setting the volume of at least the gas supply pipe, a temperature detected by the meteorological condition detecting means, and an atmospheric pressure, And a correction unit for correcting the flow rate detected by the flow rate detection unit based on the volume level set by the pipe volume level setting unit.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a configuration of a gas supply system using a gas minute flow rate detection device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a gas minute flow rate detecting device according to the first embodiment.

FIG. 3 is a conceptual diagram showing data in a RAM provided in the gas minute flow rate detection device of the first embodiment.

FIG. 4 is a flowchart of a main routine for explaining the operation of the first embodiment.

FIG. 5 is a flowchart showing a flow rate calculation process of the first embodiment.

FIG. 6 is a time chart showing flow rate values taken in by the gas micro-leakage detection apparatus of the first embodiment.

FIG. 7 is a diagram showing an output example of data according to the first embodiment.

FIG. 8 is a block diagram showing a configuration of a gas minute flow rate detecting device according to a second embodiment of the present invention.

FIG. 9 is a diagram showing an output example of data according to the second embodiment.

FIG. 10 is a block diagram showing a configuration of a gas minute flow rate detection device according to a third embodiment of the present invention.

FIG. 11 is an overall configuration diagram showing a configuration of a gas supply system using a conventional gas micro leak detection device.

[Explanation of symbols]

1 Gas Supply Source 2, 8 Gas Supply Pipe 10 Recorder (Output Means) 11 Recording Paper 21 Flow Rate Sensor (Flow Rate Detection Means) 23 Microprocessor (Correction Means) 29 Pressure Sensor (Meteorological Condition Detection Means) 30 Temperature Sensor (Meteorological Conditions) Detecting means) 31 Temperature reading interval setting device (temperature reading interval setting means) 32 Piping volume level setting device (piping volume level setting means)

Claims (8)

[Claims] 1. A flow rate detecting means for detecting a flow rate of gas flowing in a gas supply pipe for transferring gas from a gas supply source to a combustor, and a meteorological condition detecting means for detecting at least one of an outside air temperature and an outside air pressure. And a correction unit that corrects the flow rate detected by the flow rate detection unit based on at least one of the temperature and the atmospheric pressure detected by the weather condition detection unit. Detection device. 2. The gas micro leak detection device according to claim 1, wherein the correction means uses the temperature detected by the weather condition detection means a predetermined time before as the correction data at the present time. 3. The gas micro leak detection device according to claim 1, further comprising output means for outputting the flow rate value corrected by the correction means at each measurement time. 4. A flow rate detecting means for detecting a flow rate of a gas flowing in a gas supply pipe for transferring the gas from a gas supply source to a combustor, and a weather condition detecting means for detecting at least one of an outside air temperature and an outside air pressure. And storage means for sequentially storing at least one of temperature and atmospheric pressure detected by the weather condition detecting means and a flow rate detected by the flow rate detecting means at a first predetermined time interval. Micro leak detection device characterized by. 5. The gas micro-leakage detection device according to claim 4, wherein the temperature stored in the storage unit together with the flow rate is a temperature measured a second predetermined time before by measuring the flow rate. 6. The gas micro leak detection device according to claim 4, further comprising temperature detection time setting means for setting a second predetermined time. 7. The gas micro-leakage detection device according to claim 4, further comprising output means for outputting to at least one of the flow rate value, the temperature, and the atmospheric pressure stored in the storage means. 8. A flow rate detecting means for detecting a flow rate of a gas flowing in a gas supply pipe for transferring the gas from a gas supply source to a combustor, and a weather condition detecting means for detecting at least one of an outside air temperature and an outside air pressure. A pipe volume level setting means for setting at least the volume of the gas supply pipe, at least one of temperature and atmospheric pressure detected by the meteorological condition detecting means, and the pipe volume level setting means. A gas micro-leakage detection device comprising: a correction unit that corrects the flow rate detected by the flow rate detection unit based on a volume level.