JP6089018B2 - Gas demand monitoring device - Google Patents

Description

  The present invention is a gas that is connected to a gas meter having a consumption monitoring pulse output function, receives a monitoring pulse output from the gas meter, and displays an alarm or the like when there is a risk that the gas consumption exceeds a demand set value. The present invention relates to a demand monitoring apparatus.

  The contract for supplying gas for business use generally defines the contract amount (demand) of gas usage per hour per year, and there is a penalty such as raising the basic charge if it is exceeded even once. In order to prevent such a situation, various demand monitoring apparatuses as described above have been conventionally devised. For example, in the following patent document, the consumption monitoring pulse output from the gas meter (demand meter) is counted to accumulate the gas usage, and the gas usage after a predetermined time is predicted based on the gas usage. A gas demand monitoring device has been proposed that issues an alarm when a result is likely to exceed a preset value.

Utility Model Registration No. 3184618

  By the way, the gas company measures the gas demand value based on a clock built in the gas meter, but the gas meter itself is not designed to output the time signal of the clock externally. For this reason, there is a possibility that a deviation occurs in the timing of monitoring the gas consumption between the gas meter and the gas demand monitoring device, and the gas demand monitoring device may erroneously output a demand warning. In addition, since the degree of freedom in setting alarm conditions and the like is low, it has been difficult to customize to issue a demand alarm in accordance with the tendency of consumer gas consumption.

  The present invention has been made paying attention to such a problem. In the gas demand monitoring apparatus, the first object is to synchronize the timing of monitoring gas consumption with a gas meter. The second object is to make it possible to customize the settings according to the gas consumption tendency of consumers.

The present invention relates to a gas demand monitoring apparatus connected to a gas meter having a monitoring pulse output function, a clock circuit for timing a demand time period, and at least gas integration at predetermined time intervals by counting detection pulses output from the gas meter. A detection pulse calculation unit that calculates a value, a clock operation unit that accepts a meter synchronization operation and resets the gas demand time period and the gas integrated amount, and an operation that divides the demand time period into a plurality of time zones. An alarm condition setting unit that receives and stores an alarm condition based on the integrated gas value and an operation for setting an alarm release condition for at least one of the determined time zones, and a time zone in which the alarm condition and the alarm release condition are set The establishment of the alarm condition and the alarm release condition is monitored every predetermined time, and the alarm condition is established. After the alarm release condition; and a warning control unit for starting the display of them if demand alarm after a predetermined grace time without satisfied.

The present invention also relates to a gas demand monitoring device connected to a gas meter having a monitoring pulse output function, a clock circuit for measuring a demand time period, and counting the detection pulses output from the gas meter to integrate the gas every predetermined time. Detection pulse calculation unit that calculates a value and an expected demand value, a clock operation unit that accepts a meter synchronization operation to time the gas demand time period, resets the accumulated gas amount and the demand predicted value, and sets the demand time period to a plurality of times Alarm conditions for receiving and storing an operation for dividing into zones, an alarm condition based on an integrated gas value and an estimated demand value, and an operation for setting an alarm release condition based on the expected demand value for at least one of the classified time zones At a predetermined time in the time zone where the setting unit and the alarm condition / alarm release condition are set An alarm control unit that monitors establishment of the alarm condition and the alarm release condition every time, and starts displaying a demand alarm if a predetermined grace period elapses without the alarm release condition being satisfied after the alarm condition is satisfied; It is characterized by providing.

  In the present invention, the timing for monitoring the gas consumption can be synchronized with the gas meter by performing the meter synchronization operation with the clock operation unit. This suppresses an error between the demand value read by the gas company and the demand value monitored by the demand monitoring device. Further, by operating the alarm condition setting unit, the demand time period can be freely divided into a plurality of time zones, and the alarm condition and the alarm release condition can be freely set for a desired time zone. As a result, it is possible to issue a demand alarm at a timing suitable for the consumer's gas consumption tendency.

It is a block diagram which shows the basic composition of the gas demand monitoring apparatus made into an example of 1st Embodiment. It is a block diagram which shows the structure of the modification of a gas demand monitoring apparatus. (A) is an example of a monitoring screen displayed on the demand monitoring device. (B), (c) is a display example of a demand alarm. It is a flowchart which shows an example of the demand monitoring procedure by this embodiment. It is drawing which shows the specific example of the basic operation | movement of this embodiment. It is drawing which shows the other example of the basic operation | movement of this embodiment. It is drawing which shows the specific example of the basic operation | movement of 2nd Embodiment.

  FIG. 1 is a gas system diagram showing a basic configuration of a gas demand monitoring apparatus as an example of the first embodiment of the present invention. The demand monitoring device 10 is wired or wirelessly connected to a gas meter 20 having a consumption monitoring pulse output function, receives a monitoring pulse output from the gas meter 20, calculates a gas integrated value, etc., and the gas integrated value indicates a demand set value. When there is a risk of exceeding, an alarm is displayed and output. As a result, the use of gas exceeding the gas demand set value can be prevented.

  A gas pipe 21 is laid from the gas supply source to the load device 30, and the gas meter 20 is interposed in the gas pipe 21. The load device 30 is installed in a work place or the like and is provided with an operation panel 31 for performing operations such as heating power adjustment. In general, the gas meter 20 is provided at the base portion of the gas pipe 21, and the demand monitoring apparatus 10 is provided in an office or the like, and a monitoring pulse is transmitted by connecting the two with a twisted pair line or the like. The gas meter 20 may have a built-in demand meter for the gas company to measure the demand value, or may be provided as a separate body. The monitoring pulse received by the demand monitoring device 10 may be an original pulse output from the gas meter 20 or may be a combined pulse obtained by adding the monitoring pulses of the plurality of gas meters 20 by a demand meter. Hereinafter, the components of the demand monitoring apparatus 10 will be described in order.

  The clock circuit 11 is an electronic circuit composed of a crystal oscillator or the like, and measures time by repeating a demand time period. Since the gas demand period is normally 60 minutes, the clock circuit 11 measures the demand period 24 times per day. The clock circuit 11 may maintain the current time and time the demand time limit from 0 minutes 0 seconds per hour based on the current time. Of course, it is not always necessary to synchronize the start of the timing of the demand time period with 0 minutes 0 seconds of the current time being maintained.

  The clock operation unit 12 is an electronic circuit composed of switches such as push buttons, and accepts a meter synchronization operation to reset the clock of the clock circuit 11. The gas meter (load meter) 20 has a built-in clock, and displays the current time on a display window or the like. The demand value is measured by the gas company by counting detection pulses starting from 0 minutes and 0 seconds of the current time indicated by the clock. The meter synchronization operation refers to an operation for starting the timing of the clock circuit 11 on the demand monitoring device side at 0 minute 0 second of the time indicated by the clock on the gas meter side. That is, when the meter synchronization operation is performed, the time count of the demand monitoring device 10 is reset to 0 minute 0 second. The gas meter 20 is not generally designed to output a time signal to the outside, but by performing such meter synchronization, a demand value monitored by the gas company and a demand value monitored by the demand monitoring device 10 are between. Errors can be suppressed. When a time synchronization signal is output from the gas meter 20, it is preferable to synchronize the timing of the synchronization signal with the timing of the demand time period by a meter synchronization operation or automatically.

  The detection pulse calculation unit 13 is an electronic circuit including a counter circuit, a CPU, and the like, and counts the detection pulses output from the gas meter 20 and calculates at least a gas integrated value every predetermined time. A detection pulse is output each time a unit amount of gas is consumed. In general, one pulse is generated every 1 cubic meter. However, in the case of a large user, one pulse is generated every 10 cubic meters. Therefore, the gas integrated value may be calculated by multiplying a multiplier selected in advance from any one of 0.1, 1, 10, 100 cubic meters / count by the pulse count.

  In addition to the integrated gas value, the detection pulse calculation unit 13 may calculate a predicted integrated gas value after a predetermined time. The predetermined time may be selected in advance from the end of the demand time period, for example, 5 minutes, 10 minutes later, or any time may be designated. The calculation method of the gas integrated expected value is not particularly limited. For example, the gas use pace may be estimated from the latest gas integrated value (one point), and the estimated gas integrated value after a predetermined time may be calculated based on the estimated pace.

  The alarm condition setting unit 14 is an electronic circuit including a display operation unit, a CPU, a memory, and the like. The alarm condition setting unit 14 performs an operation for dividing the demand time period into a plurality of time zones, and sets the gas integrated value in at least one of the divided time zones. Based on the alarm condition and the operation to set the alarm release condition are received and stored. The operation of dividing the demand time period is to divide the demand time period (60 minutes) into a predetermined number of time zones (1, 2, 3, etc.), but the number of time zone divisions and the time of each time zone are particularly limited. It is only necessary that the total time of all divided time zones matches the demand time limit.

  The alarm condition and the alarm release condition are not particularly limited as long as the condition is satisfied or not determined based on the integrated gas value. For example, when the demand reference line that reaches the demand set value at the end of the demand time limit is defined, the alarm condition is defined by the offset A with respect to the reference line (parallel line with respect to the demand reference line), and the integrated gas value> reference line + offset A It may be established when it becomes. Similarly, the alarm cancellation condition may be defined by the offset B with respect to the reference line, and may be satisfied when the gas integrated value ≦ the reference line + offset B. In this case, if offset A> offset B, offsets A and B may be either positive or negative. The offsets A and B may be different for each time zone. In the case of such alarm conditions and alarm release conditions, the alarm condition setting unit 14 only needs to be able to select a desired time zone and set the numerical values of offsets A and B for the time zone.

  The alarm control unit 15 is an electronic circuit composed of a CPU, a memory, etc., and monitors the establishment of the alarm condition and the alarm release condition every predetermined time in the time zone where the alarm condition and the alarm release condition are set. If a predetermined grace period elapses without satisfying the alarm release condition after being established, display of the demand alarm is started. After the display of the demand alarm is started, the alarm display may be stopped if the alarm release condition is satisfied. Of course, the alarm display may be manually stopped by an alarm stop operation or the like.

  The alarm display unit 16 is a display circuit including an alarm lamp or a liquid crystal panel, and displays a demand alarm by lighting the lamp or displaying a message on the panel. The display mode is not particularly limited, but the display mode may be changed with the passage of time from the start of the demand alarm display. For example, in the case of an alarm lamp, it may be in a blinking state until a predetermined time has elapsed from the start of display of a demand alarm, and may be in a continuously lit state after the predetermined time has elapsed. In the case of a liquid crystal display panel, a message “demand warning” may be displayed until a predetermined time has elapsed from the start of display of the demand alarm, and a message “demand alarm” may be displayed after the predetermined time has elapsed.

  As described above, in this embodiment, the demand time period is freely divided into a plurality of time zones, and the alarm condition and the alarm release condition can be set for a desired time zone. It becomes possible to issue a demand alarm at a timing suitable for. For example, for consumers with a large range of thermal power adjustment of the load device, since the time allowance for thermal power adjustment is large at the early stage of the demand time period, the alarm condition and the alarm release condition should be relaxed, and at the late stage of the demand time period Since the time margin for adjusting the thermal power is small, it is possible to provide a demand alarm that allows a large thermal power at an early stage of the demand period by making the alarm condition and the alarm release condition severe. In addition, for consumers who operate the load device with a substantially constant heating power, it is possible to adjust the heating power along the reference line by setting the alarm condition and the alarm release condition of each time zone strictly along the reference line. Demand demand warning to be enabled.

  FIG. 2 is a gas system diagram showing a configuration of a modification of the present embodiment. Elements common to FIG. 1 are denoted by the same reference numerals and description thereof is omitted.

  This demand monitoring apparatus 10 is characterized in that a remote type clock operation unit 12a is further provided. The connection between the timepiece operation unit 12a and the monitoring apparatus main body may be wired or wireless. Such a timepiece operation unit 12a can be installed in the vicinity of the gas meter 20, so that one operator can perform the meter synchronization operation with high accuracy while viewing the time display of the gas meter 20.

  That is, in the configuration shown in FIG. 1, since the clock operation unit 12 is incorporated in the demand monitoring device 10, two workers cooperate, that is, an operator on the gas meter side monitors the contents of the time display on the gas meter. Although it is necessary to set the timing of the meter synchronization operation by sequentially transmitting it to a worker on the apparatus side with a mobile phone or the like, such work can be greatly simplified if there is a remote type clock operation unit 12a.

  The demand monitoring device 10 may output a demand alarm to an external device. In FIG. 2, a patrol lamp 32 and a buzzer 33 are provided as an example of an external device. If such a patrol lamp 32 and a buzzer 33 are arranged in the work place, there is an advantage that even if the demand monitoring device 10 is installed in an office or the like away from the work place, a worker in the work place can surely notice the demand alarm. A fire reduction command or the like may be transmitted to the control panel in conjunction with the output of the demand alarm.

  FIG. 3A illustrates a monitoring screen as an example of a display screen in a common display operation unit provided in the demand monitoring apparatus. The common display operation unit 17 is composed of a touch panel and displays the monitoring screen shown during demand monitoring, but also functions as the clock operation unit 12, the alarm condition setting unit 14, and the alarm display unit 16 by screen switching.

  The monitoring screen will be described. On the right side of the screen, a demand set value display column 17a, a gas integrated value display column 17b, a gas integrated expected value display column 17c, and an elapsed time display column 17d are provided in order from the top. On the left side of the screen, a graph display field 17e indicating the transition of the integrated gas value is provided. Below the graph display field 17e, a screen switching icon 17f and a demand alarm display field 17g are provided.

  The demand setting value display column 17a always displays the demand setting value set at the time of initial setting. The gas integrated value display column 17b updates and displays the latest gas integrated value calculated by counting the detection pulses of the gas meter 20 every predetermined time. The gas integrated expected value display column 17c updates and displays the gas integrated estimated value after a predetermined time. In this example, it is set to display the estimated gas integrated value after 5 minutes, but it can be switched to the estimated gas integrated value at the end of the demand time limit after 10 minutes and 20 minutes. The elapsed time display column 17d updates and displays the elapsed time from the start of the demand time period.

  The graph display column 17e displays in real time the transition of the gas integrated value from the start to the end of the demand time period. The horizontal axis is the time axis, and the right end thereof coincides with the demand time limit (60 minutes). The vertical axis represents the gas integrated value, and the upper end thereof coincides with the demand setting value. Since the integrated gas value is an integrated value of gas usage from the start of the demand time period to the present time, it does not decrease during the demand time period. In other words, the graph rises to the right as a whole even if there is a horizontal part locally. In the figure, the transition of the integrated gas value is indicated by a thick line, and the estimated integrated gas value after 5 minutes is indicated by a thick broken line.

  The screen switching icon 17f is a combination of an upward triangle button and a downward triangle button, and accepts an operation of cyclically switching the screen type displayed on the common display operation unit 17. As the screen type, in addition to the monitoring screen as shown in the figure, the clock operation unit 12 accepts time setting and meter synchronization operation, the alarm condition setting unit 14 accepts an operation for dividing the demand time period into a plurality of time zones, A screen for accepting an operation for selecting a time zone and setting an alarm condition and an alarm release condition is prepared.

  The demand warning display column 17g displays a demand warning and a demand warning as shown in FIGS. 3 (b) and 3 (c). The demand warning and demand warning may be a message or an illustration. Moreover, it is good to change both display modes, such as changing a color by a demand warning and a demand warning.

  Although explanations of examples of the display screen as the clock operation unit 12 and the alarm condition setting unit 14 are omitted, for example, a screen configuration in which a numerical display column and a numeric keypad are appropriately arranged may be used.

  FIG. 4 is a flowchart showing an example of the demand monitoring procedure of the present embodiment. In this flowchart, procedures such as initial setting of the demand monitoring apparatus and alarm condition setting are omitted, and only the core part of the demand monitoring procedure is shown.

  Step 100 in the procedure is a process for detecting a meter synchronization operation. If a meter synchronization operation is detected, the entire demand monitoring procedure is reset at step 101. Specifically, processing is performed to return the time of the demand time limit, the count value of the detection pulse, the gas integrated value, etc. to zero.

  Step 102 is processing for counting detection pulses. Step 103 is a process for determining the passage of a predetermined time. This predetermined time defines the number of times the demand monitoring procedure is executed per unit time. That is, while counting a predetermined time (for example, 1 second), the process of counting the detection pulses is repeated, and when the predetermined time has elapsed, the processes after step 104 are executed.

  Step 104 is a process of calculating the integrated gas value from the count value of the detection pulse. Steps 105 and 106 are processes for specifying the current time zone and reading the alarm condition and the alarm release condition corresponding to the time zone.

  Step 107 is a process for determining whether or not the alarm timer is activated. The alarm timer measures the elapsed time after the alarm condition is satisfied. In this flow, the activation state of the timer is treated as a flag indicating whether the alarm condition is satisfied or not. If the alarm timer is not activated, it is further determined in step 108 whether or not the alarm condition is satisfied. If the alarm condition is satisfied, the alarm timer is activated in step 109 (flag set). ).

  Step 110 is a process executed when it is determined in step 107 that the alarm timer is activated, and it is determined whether or not an alarm release condition is satisfied. If the alarm cancellation condition is satisfied, the alarm timer is stopped in step 111 to return the elapsed time to zero (flag reset). Step 112 is a process for determining whether or not an alarm is being displayed. If the alarm is being displayed, the alarm display is stopped at step 113.

  Step 114 is a process executed when it is determined in step 107 that the alarm timer is activated, and in step 110 it is determined that the alarm release condition is not established. It is determined whether or not a grace period from when the is established until the alarm display starts. If the grace time has elapsed, it is determined in step 115 whether or not an alarm is being displayed. If not, the alarm display is started in step 116.

  Step 107 is processing for determining whether or not the demand time limit has elapsed. If the demand time limit has not elapsed, the process returns to step 102 to continue the detection pulse counting process. On the other hand, if the demand time limit has elapsed, the process returns to step 101, the entire demand monitoring procedure is reset, and then the detection pulse counting process in step 102 is restarted.

Next, a specific example of the basic operation of this embodiment will be described.
FIG. 5 is a combination of a graph showing an example of the transition of the integrated gas value, a demand alarm display, and a waveform diagram showing the buzzer sounding. The time axis of the graph and the time axis of the waveform diagram are matched. . In the graph, the demand reference line X is indicated by a thick line, and the integrated gas value is indicated by a thick broken line.

  Here, it is assumed that the load device is continuously operated while appropriately adjusting the heating power. Therefore, during the demand period, the integrated gas value always increases to the right while changing the slope.

  As a premise of the operation here, the demand time period is divided into time zones 1, 2, and 3, and the alarm condition and the alarm release condition are defined for the time zones 2 and 3.

  That is, in the time zone 2, the alarm start condition is defined by the offset A1 (A1> 0) with respect to the demand reference line X, and is satisfied when the gas integrated value> reference line + offset A1. The alarm cancellation condition is defined by the offset B1 (B1 = 0) with respect to the reference line X, and is satisfied when the gas integrated value ≦ reference line + offset B1.

  In the time zone 3, the alarm start condition is defined by the offset A2 (A2 = 0) with respect to the reference line, and is satisfied when the gas integrated value> reference line + offset A2. The alarm cancellation condition is defined by the offset B2 (B2 <0) with respect to the reference line X, and is satisfied when the gas integrated value ≦ the reference line + offset B2.

  In time zone 1, no alarm condition is set, so no demand alarm is displayed. At the start of time zone 2, the demand monitoring device reads alarm conditions, alarm release conditions, etc. corresponding to this time zone.

  At time T1, since the integrated gas value exceeds the alarm condition, timing for demand alarm is started (alarm timer activation). At time T2, since the time has reached the grace time, display of a demand alarm (warning display) is started. At the same time, the buzzer started to ring. There is no need to start the display of the demand alarm and the buzzer at the same time, and the timing may be shifted. At time T3, since a predetermined time has elapsed since the start of the demand alarm display, the display mode (alarm display) of the demand alarm is changed. At time T4, since the buzzer stop operation has been performed, the buzzer is stopped. At time T5, the display of the demand alarm is stopped because the integrated gas value has fallen below the alarm release condition.

  At time T6, since the integrated gas value again exceeds the alarm condition, timing for demand alarm is started. Immediately after time T6, the time zone is switched to 3, and the alarm condition and alarm release condition corresponding to this time zone are read out. Timekeeping continues even if the time zone changes during the timekeeping. At time T7, since the time has reached the grace period, display of demand alarm (warning display) and ringing of the buzzer are started. This grace time corresponds to time zone 3, and is shorter than that of time zone 2. At time T8, since a predetermined time has elapsed since the start of the demand alarm display, the demand alarm display mode (alarm display) is changed. At time T9, since the buzzer stop operation has been performed, the buzzer is stopped. At time T10, the display of the demand alarm is stopped because the integrated gas value falls below the alarm cancellation condition.

Further, another example of the basic operation of this embodiment will be described.
FIG. 6 is a combination of a graph showing an example of the transition of the integrated gas value and a waveform diagram showing a demand alarm display and a buzzer sounding, as in FIG.

  Here, it is assumed that the load device is operated in a batch format (a mode in which a short period of operation and a stop of operation are repeated with a large heating power). Specifically, the load device is operated twice during the demand period.

  The demand time period is divided into time zones 1, 2, and 3, and alarm conditions and alarm release conditions are defined for time zones 2 and 3. The definition, establishment and failure of these conditions are the same as in the example of FIG. In this example, the offsets A1 and A2 related to the alarm condition are somewhat lower than the target gas consumption for one use of the load device, so that the gas demand alarm display or buzzer sounds can be reduced. This is a guideline for when to stop. Further, the offsets B1 and B2 related to the alarm cancellation condition are set so that the display of the demand alarm is stopped in a relatively short time when the load device is appropriately stopped.

  The description of the start and end of the demand alarm display based on the transition of the integrated gas value for each time is substantially the same as the example of FIG.

  Finally, an example of the second embodiment in which the contents of alarm conditions and alarm release conditions are different from those of the first embodiment will be described. However, the basic configuration itself is the same as that of the above embodiment, that is, the configuration shown in FIG. 1 or FIG. The main difference from the above embodiment is the contents of alarm conditions and alarm cancellation conditions.

  In the present embodiment, the detection pulse calculation unit calculates a gas integrated value and a demand predicted value. The predicted demand value may be calculated, for example, from the most recent gas integrated value and the most recent slope, by expressing the estimated gas integrated value by a linear function of time, and calculating the value at the end of the demand time limit of the function. In this way, the demand prediction value can be obtained with high accuracy.

  In the alarm condition setting unit, an operation for dividing the demand time period into a plurality of time zones, an alarm condition based on the gas integrated value and the demand predicted value for at least one of the classified time zones, and an alarm canceling condition based on the demand predicted value Is received and stored.

  The alarm condition is based on the gas integrated value and the demand demand value. The alarm condition includes a condition for the former and a condition for the latter, and the alarm condition is satisfied when both of them are satisfied. The conditions for the integrated gas value may be the same as those in the above embodiment. However, the conditions for the demand prediction value are based on estimating the current gas use pace from a plurality of latest integrated gas values, and the demand based on the estimated pace. It is established when the demand predicted value at the end of the time limit> the reference value. The reference value here is one of the conditions set by the alarm condition setting unit.

  The alarm cancellation condition is established when the current gas use pace is estimated from the most recent accumulated gas values, and the demand predicted value at the end of the demand time period ≦ the reference value based on the estimated pace. This reference value may be the same as or different from the reference value in the alarm condition.

  Note that, as in the above embodiment, the establishment of the alarm condition and the alarm release condition is monitored every predetermined time in the time zone in which the alarm condition and the alarm release condition are set, and the alarm release condition is not established after the alarm condition is established. If a predetermined grace time elapses, display of a demand alarm is started.

  FIG. 7 is a combination of a graph showing an example of the transition of the integrated gas value in this embodiment, a waveform display showing a demand alarm display, and a buzzer sounding. The time axis of the graph and the time axis of the waveform diagram are matched. In the graph, the demand reference line X is indicated by a thick line, and the integrated gas value is indicated by a thick broken line.

  As a premise of this operation, the demand time period is divided into time zones 1, 2, and 3, and alarm conditions and alarm release conditions are defined for time zones 2 and 3.

  That is, in the time zone 2, the condition for the integrated value in the alarm start condition is defined by the offset A1 (A1> 0) with respect to the demand reference line X, and is established by the gas integrated value> reference line X + offset A1. Further, the condition for the predicted gas demand value in the alarm condition is defined by the reference value S, and the gas demand predicted value> the reference value S is satisfied. On the other hand, the alarm cancellation condition is defined by the reference value S, and is satisfied when the gas demand prediction value ≦ the reference value S.

  In the time zone 3, the condition for the integrated value in the alarm start condition is defined by the offset A2 (A2 = 0) with respect to the demand reference line X, and is established by the gas integrated value> reference line X + offset A2. Further, the condition for the predicted gas demand value in the alarm condition is defined by the reference value S, and the gas demand predicted value> the reference value S is satisfied. On the other hand, the alarm cancellation condition is defined by the reference value S, and is satisfied when the gas demand prediction value ≦ the reference value S.

  In time zone 1, no alarm condition is set, so no demand alarm is displayed. At the start of time zone 2, the demand monitoring device reads alarm conditions, alarm release conditions, etc. corresponding to this time zone.

  At time T21, since the alarm condition is established for both the gas integrated value and the demand predicted value, timing for the demand alarm is started. At time T22, since the time has reached a grace period, display of a demand alarm (warning display) is started. At the same time, the buzzer started to ring. At time T23, since a predetermined time has elapsed since the start of the demand alarm display, the demand alarm display mode (alarm display) is changed. At time T24, since the buzzer stop operation has been performed, the buzzer is stopped. At time T25, since the demand alarm cancellation condition is satisfied, the display of the demand alarm is stopped.

  In the figure, regarding the demand prediction value at time T25, a linear function determined from the value of the gas integrated value at the time and the latest slope is indicated by a one-dot chain line. The demand prediction value is obtained as a value at the end of the demand time limit on the linear function. In addition, the ellipse in the figure is a partial region of the integrated gas value that is referred to in order to determine such a temporary function.

  At time T26, since alarm conditions are established for both the gas integrated value and the demand predicted value, timing for the demand alarm is started. At time T27, since the time has reached a grace period, display of a demand alarm (warning display) is started. At the same time, the buzzer started to ring. At time T28, since the buzzer stop operation has been performed, the buzzer is stopped. At time T29, since a predetermined time has elapsed since the start of the demand alarm display, the demand alarm display mode (alarm display) is changed. At time T30, since the alarm release condition is satisfied, the display of the demand alarm is stopped.

  At time T26, since alarm conditions are established for both the gas integrated value and the demand predicted value, timing for the demand alarm is started. At time T27, since the time has reached a grace period, display of a demand alarm (warning display) is started. At the same time, the buzzer started to ring. At time T28, since the buzzer stop operation has been performed, the buzzer is stopped. At time T29, since a predetermined time has elapsed since the start of the demand alarm display, the demand alarm display mode (alarm display) is changed. At time T25, since the alarm release condition is satisfied, the display of the demand alarm is stopped.

  At time T31, the alarm condition has already been established for the integrated gas value, but since the alarm condition has also been established for the demand predicted value at this time, timing for the demand alarm is started. At time T32, since the timing has reached the grace period, display of a demand alarm (warning display) is started. At the same time, the buzzer started to ring. At time T33, since a predetermined time has elapsed since the start of the demand alarm display, the demand alarm display mode (alarm display) is changed. At time T34, since the alarm release condition is satisfied, the display of the demand alarm is stopped. At time T35, since the buzzer stop operation has been performed, the buzzer is stopped. In this manner, the buzzer may continue to sound until the buzzer stop operation is performed even after the display of the demand alarm is stopped.

  What should be noted in this embodiment is that, as in the operation at times T25, T29, and T34, even if the integrated gas value is higher than the reference line, if the demand predicted value falls below the reference value, a demand alarm is displayed. It is a point to stop. This means that when the prediction that the demand set value will be exceeded is changed to the prediction that the demand set value will not be exceeded by adjusting the heating power of the load device, the demand alarm display will be stopped immediately. The effect of being able to know the effect of firepower adjustment quickly is obtained.

DESCRIPTION OF SYMBOLS 10 Gas demand monitoring apparatus 11 Clock circuit 12 Clock operation part 13 Detection pulse calculating part 14 Alarm condition setting part 15 Alarm control part 20 Gas meter

Claims (5)

In a gas demand monitoring device connected to a gas meter having a monitoring pulse output function,
A clock circuit that measures the demand time limit,
A detection pulse calculation unit that counts the detection pulses output from the gas meter and calculates at least a gas integrated value every predetermined time; and
A clock operation unit that accepts a meter synchronization operation and resets the time count of the gas demand time period and the accumulated gas amount;
An alarm condition setting unit for receiving and storing an operation for dividing a demand time period into a plurality of time zones, an alarm condition based on a gas integrated value, and an operation for setting an alarm release condition for at least one of the divided time zones;
In the time zone in which the alarm condition and the alarm release condition are set, the establishment of the alarm condition and the alarm release condition is monitored every predetermined time, and after the alarm condition is satisfied, the alarm release condition is not satisfied and the predetermined delay is established. A gas demand monitoring device comprising an alarm control unit that starts displaying a demand alarm when time elapses. In a gas demand monitoring device connected to a gas meter having a monitoring pulse output function,
A clock circuit that measures the demand time limit,
A detection pulse calculation unit that counts the detection pulses output by the gas meter and calculates a gas integrated value and an expected demand value every predetermined time;
A clock operation unit that accepts a meter synchronization operation to time the gas demand time period, and resets the accumulated gas amount and the predicted demand value;
An operation for dividing the demand time period into a plurality of time zones, and an operation for setting an alarm condition based on the integrated gas value and the predicted demand value and an alarm release condition based on the predicted demand value for at least one of the divided time zones. An alarm condition setting unit for receiving and storing; and
In the time zone in which the alarm condition and the alarm release condition are set, the establishment of the alarm condition and the alarm release condition is monitored every predetermined time, and after the alarm condition is satisfied, the alarm release condition is not satisfied and the predetermined delay is established. A gas demand monitoring device comprising an alarm control unit that starts displaying a demand alarm when time elapses. In claim 1 or 2,
The alarm control unit, after starting display of the demand alarm, stops displaying the alarm if the alarm cancellation condition is satisfied. In any one of Claims 1 thru | or 3,
The gas demand monitoring apparatus, wherein the alarm control unit changes a display mode of the demand alarm as time passes. In any one of Claims 1 thru | or 4,
The gas demand monitoring device, wherein the alarm control unit sounds an alarm sound in addition to the display of the demand alarm.

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