JP4625307B2 - Gas counter and gas meter - Google Patents

Description

  The present invention acquires a gas flow rate measured by a gas flow meter, and among a plurality of gas devices connected to the downstream side of the gas flow meter, a flow rate by a gas flow rate change means provided in any of the gas devices. The present invention relates to a gas counter that determines whether or not there is a change, and a gas meter that includes the gas counter and a gas flow meter.

FIG. 4 shows the measurement results of the gas flow meter in a graph with the horizontal axis representing [time] and the vertical axis representing [gas flow rate]. For example, at least three gas devices (for example, a bath, a gas stove, a water heater, etc.) are connected to the gas flow meter, and the gas measured by the gas flow meter according to the usage status of the plurality of gas devices. The flow rate changes. And the conventional gas counter acquires the gas flow rate from the gas flow meter, and when the amount of change in the flow rate exceeds a preset discrimination reference value, the gas flow rate changing means provided in any gas device The flow rate was determined to have changed, and if the amount of change in the flow rate did not exceed the discrimination reference value, it was determined that the flow rate had changed due to other factors. Specifically, in FIG. 4, the change amount ΔQ of the flow rate in the portions indicated by reference numerals P1 to P3 and P5 to P7 changes beyond the discrimination reference value, so the gas provided in any of the gas appliances It is determined that the flow rate has been changed by the flow rate changing means, and the change amount ΔQ of the flow rate at the portion indicated by the symbol P4 is smaller than a predetermined reference value, so it is determined that the disturbance is caused by factors other than the gas flow rate changing means. (For example, see Patent Document 1).
JP-A-4-6416 (FIG. 6)

  By the way, in a housing complex in which a plurality of houses share a gas supply source, when gas is used in a certain house and the supply gas pressure decreases, the supply gas pressure of the adjacent house also decreases. This becomes the disturbance described above and appears as a change in the flow rate of the gas measured by the gas flow meter. On the other hand, in a detached house, the supply gas pressure is rarely linked between adjacent houses. However, in the above-described conventional gas counter, since the discrimination reference value is set in advance as a predetermined fixed value, in a detached house, a change in flow rate due to a gas flow rate changing means (for example, a valve) provided in the gas appliance, Even if the change in flow rate due to disturbance can be discriminated properly, it may not be possible to discriminate properly in apartment buildings. In addition, the determination reference value is set to an unnecessarily large fixed value, and a change in the flow rate by the gas flow rate changing means provided in the gas equipment is also recognized as a disturbance, so that appropriate determination cannot be performed. Obtained.

  Further, in the configuration in which the discrimination reference value is fixed as in the conventional gas counter described above, for example, the gas counter fixed to the discrimination reference value for a detached house and the discrimination reference value for an apartment house are fixed. As a result, an assortment of products including a gas counter is necessary, which is undesirable for manufacturers in terms of inventory management and parts management.

  The present invention has been made in view of the above circumstances. Regardless of the difference in the situation in which the gas counter and the gas meter are used, the flow rate change by the gas flow rate change means provided in the gas equipment, and the flow rate change due to disturbance, It is an object of the present invention to provide a gas counter and a gas meter capable of appropriately discriminating the above.

In order to achieve the above object, a gas counter according to claim 1 acquires a gas flow rate measured by a gas flow meter, and a gas flow rate change means provided in a plurality of gas devices connected downstream of the gas flow meter. From the flow rate Q2 measured by the gas flow meter and the flow rate Q1 measured by the gas flow meter after a predetermined interval after the flow rate Q2 is measured, = (Q2−Q1) / Q2, the flow rate change rate R is calculated, and depending on whether or not the change rate R exceeds the discrimination reference value, the flow rate by the gas flow rate changing means provided in any of the gas appliances A first gas appliance flow rate change determining means for determining whether or not there is a change, a flow rate Q2 measured by the gas flow meter, and a flow rate Q1 measured by the gas flow meter after a predetermined interval after measuring the flow rate Q2. Difference D exceeds the criterion value A second gas equipment flow rate change judging means for judging whether or not there is a flow rate change by a gas flow rate changing means provided in any one of the gas equipments. A discriminating reference value setting means for changing the discriminating reference value, and the discriminating reference value as a first discriminating reference value for the case where the gas counter is installed for each residence of the apartment house. And a discrimination reference value setting means that can be switched to a second discrimination reference value for the case where the gas counter is installed in a detached house .

  According to a second aspect of the present invention, in the gas counter according to the first aspect, the gas flow meter includes a flow rate pulse output unit that outputs a flow rate pulse every time a certain amount of gas flows, and a flow rate output from the flow rate pulse output unit. The flow rate calculation unit that calculates the gas flow rate based on the pulse interval, and the predetermined interval at which the first or second gas appliance flow rate change determining means acquires the flow rate Q2 and the flow rate Q1 from the gas flow meter is as follows: The feature is that it is the interval between the flow rate pulses output from the flow rate pulse output unit.

According to a third aspect of the present invention, in the gas counter according to the first or second aspect , the first determination reference value is a value greater than 0.03 and 0.09 or less, and the second determination reference value is , 0.03.

According to a fourth aspect of the present invention, in the gas counter according to any one of the first to third aspects, the first or second gas appliance flow rate change determining means according to an increase in the gas flow rate measured by the gas flow meter. However, when it is determined that the flow rate change is caused by the gas flow rate change means provided in any of the gas appliances, the device-specific flow rate calculation means for calculating the increased flow rate and the device-specific integration for calculating the increased flow rate integrated value It is characterized by having a flow rate calculation means.

According to a fifth aspect of the present invention, in the gas counter according to any one of the first to fourth aspects, the determination reference value setting means includes a communication means for changing the determination reference value by a signal from the outside of the gas counter. It has the characteristics.

A gas meter according to a sixth aspect is characterized by including a gas flow meter for measuring a gas flow rate and the gas counter according to any one of the first to fifth aspects.

[Inventions of Claims 1 and 6 ]
According to the configuration of claims 1 and 6 , the discrimination reference value setting means changes and sets the appropriate discrimination reference value for each of the case where the gas counter is installed in each residence of the apartment house and the case where it is installed in a detached house. can do. This makes it possible to properly discriminate between changes in flow rate due to the gas flow rate change means provided in the gas equipment and changes in flow rate due to disturbances, regardless of whether the gas counter is installed in each residence or detached house of the apartment house. Is possible.

[Invention of claim 2]
According to the configuration of the second aspect, the flow rate of the gas can be calculated based on the interval between the flow rate pulses output from the flow rate pulse output unit every time a certain amount of gas flows. Further, it is possible to determine whether or not the flow rate is changed by the gas flow rate changing means provided in any of the gas appliances at intervals of the flow rate pulse output from the flow rate pulse output unit.

[Invention of claim 3 ]
According to the invention of claim 3 , when the gas counter is installed in a detached house, the change rate R of the gas flow rate by the gas flow rate changing means is relatively small by setting the discrimination reference value to “0.03”. However, it is possible to determine that the flow rate has been changed by the gas flow rate changing unit, and it is possible to appropriately determine the flow rate change by the gas flow rate changing unit of the gas equipment and the change in the flow rate due to disturbance.

  On the other hand, the first determination reference value for the case where the gas counter is installed in each residence of the apartment house is a value “greater than 0.03 and 0.09 or less”. Here, in apartment houses, the gas flow rate of one residence changes in conjunction with the use of gas in other residences, but the criterion value is set to a value greater than 0.03 and less than or equal to 0.09. Thus, it is possible to accurately distinguish the flow rate change by the gas flow rate changing means provided in the gas equipment and the gas flow rate change due to the use of gas in another residence.

[Invention of claim 4 ]
According to the gas counter of the fourth aspect , the gas usage amount can be integrated for each gas device.

[Invention of claim 5 ]
According to the invention of claim 5, the discrimination reference value can be changed from the outside of the gas counter.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the gas meter 10 of this embodiment includes a gas flow meter 12 and a gas counter 13. The gas flow meter 12 is provided in the middle of the gas flow path 50 provided in the gas meter 10 and measures the flow rate of the gas passing through the gas flow path 50 (gas meter 10). Note that the gas flow meter 12 in the present embodiment is a so-called membrane gas meter.

The gas flow meter 12 is provided with a pulse output unit 14 and a flow rate calculation unit 15. The pulse output unit 14 outputs one flow rate pulse every time a certain amount of S [cm ³ ] gas passes through the gas flow meter 12. After the flow rate pulse is output from the pulse output unit 14, the flow rate calculation unit 15 measures a time T [min] (pulse period) until the next flow rate pulse is output, and the measured time T [min ], The gas flow rate Q (= S / T [cm ³ / min]) is calculated by dividing the constant amount S [cm ³ ]. Then, the calculated flow rate measurement value is output to the gas counter 13 described later. The flow rate calculation unit 15 calculates and outputs a flow rate measurement value each time a flow rate pulse is output from the pulse output unit 14.

  In addition to the total flow rate integrator 16 that integrates the total amount of gas that has passed through the gas meter 10, the gas counter 13 is integrated with a flow rate meter 17 for each device that integrates the amount of gas used for each gas device ("accumulation by device" of the present invention). Corresponding to “flow rate calculating means”. The integration results by the total flow integrator 16 and the device-specific flow integrator 17 are displayed on a display device (not shown) provided in the gas meter 10 and transmitted to the management center via a transmission device (for example, T-NCU). Is done. Here, the gas equipment is provided with a valve as the “gas flow rate changing means” of the present invention. The valve may be manually operated to adjust the heating power, for example, a gas stove, or automatically operated according to the difference between the set temperature and the actual temperature, such as a gas hot air heater. You may do. The “gas flow rate changing means” is not limited to a valve, and may be a so-called “governor (pressure regulator)” for adjusting the gas supply pressure, for example.

  The device-specific flow integrator 17 executes the device-specific integrated flow calculation process M shown in FIG. 2 every time a flow rate measurement value is acquired from the flow calculation unit 15 (each time the pulse output unit 14 outputs a flow pulse). To do.

  When the integrated flow rate calculation process M for each device is executed, the flow rate measurement value is acquired from the flow rate calculation unit 15 (S1), and the flow rate measurement value stored in the memory is updated (S2). Specifically, the flow measurement values Q1, Q2, and Q3 for the past three times are stored in the memory. When a new flow measurement value is acquired, the oldest flow measurement value Q3 is deleted and the flow measurement value is deleted. Q2 is stored as the oldest (previous) flow measurement value Q3, the flow measurement value Q1 is stored as the previous flow measurement value Q2, and the flow measurement value acquired from the flow calculation unit 15 is stored as the current flow measurement value Q1. To do.

  Next, it is determined whether or not the gas flow rate has changed in accordance with the opening change of the valve provided in the gas device (S3). Specifically, the absolute value of the difference D between the previous flow rate measurement value Q2 and the current flow rate measurement value Q1 is the discrimination reference value (in this embodiment, a reference change rate r preset to the previous flow rate measurement value Q2). It is checked whether it is larger than (multiplied value).

  When the absolute value of the difference D between the flow rate measurement values Q1 and Q2 is larger than the discrimination reference value (Yes in S3), the flow rate change due to a change in the opening of the valve provided in the gas appliance (reference numerals P1 to P3 in FIG. 4). , P5 to P7), step S4 is executed.

  On the other hand, when the absolute value of the difference D between the flow rate measurement values Q1 and Q2 is equal to or less than the discrimination reference value (No in S3), the gas flow rate has not changed or the valve provided in the gas device is opened. It is determined that the flow rate has changed due to a disturbance other than the change in the degree (state of the symbol P4 in FIG. 4), and the process jumps to step S10. The process of step S3 corresponds to the “second gas appliance flow rate change determining means” of the present invention.

  When it is determined that the flow rate change is due to a change in the opening of the valve provided in the gas device (Yes in S3), the latest flow rate measurement value Q1 is subtracted from the oldest flow rate measurement value Q3 stored in the memory. The change amount ΔQ of the gas flow rate is calculated (S4). Note that the processing in step S4 corresponds to the “equipment-specific flow rate calculation means” of the present invention.

  When the change amount ΔQ is equal to or greater than “0” (Yes in S5, in the case of reference signs P1 to P3 in FIG. 4), it is determined that the opening degree of the valve provided in the gas appliance has been increased. Examples of the case where the opening degree of the valve is increased include a case where the gas device is “started to use” and a case where the thermal power of the gas device being used is increased. In the present embodiment, the gas device that has started to be used is identified based on the change amount ΔQ (S6).

  Specifically, in the memory of the device-specific flow accumulator 17, for each gas device (for example, a gas stove, a water heater, a bath, etc.), the reference change in the gas flow rate when the gas device is started or stopped. The amount is registered in advance. In the memory, reference change amounts K1 to K6 (K1> K2> K3> K4> K5> K6) of up to six different gas appliances can be registered. In step 6, the change amount ΔQ calculated in step S4 is compared with the reference change amounts K1 to K6 registered in advance, and it is determined that the gas appliance having the closest reference change amount has started to be used. .

  When the gas device that has started use is specified, the timer corresponding to the gas device is turned on (S7). Then, by multiplying the amount of change ΔQ by the time after the timer is turned on (usage time of the gas equipment), the integrated value of the gas usage by the gas equipment is calculated (S10, “by device” of the present invention). Corresponds to "integrated flow rate calculation means").

  On the other hand, when the change amount ΔQ is less than “0” (No in S5, in the case of reference numerals P5 to P7 in FIG. 4), it is determined that the opening degree of the valve provided in the gas appliance has been reduced. Examples of the case where the opening degree of the valve is decreased include a case where the gas device is “suspended” or a case where the thermal power of the gas device being used is reduced. In the present embodiment, the gas equipment whose use has been stopped is specified based on the absolute value of the change amount ΔQ (S8). Specifically, it is determined that the gas device having the reference change amount closest to the absolute value of the change amount ΔQ calculated in step S4 has been stopped.

  When the gas equipment that has been stopped is specified, the timer corresponding to the gas equipment is turned off (S9). Then, as described above, the integrated value of the amount of gas used by the gas device is calculated (S10). The above is the description of the integrated flow rate calculation process M for each device.

  By the way, in the gas meter 10 of the present embodiment, in the process M, when it is determined whether or not there is a flow rate change due to a change in the opening of a valve provided in the gas device (step S3 in FIG. 2), a “discrimination criterion”. The value can be changed arbitrarily. Specifically, as shown in FIG. 1, the gas counter 13 includes a discrimination reference value setting unit 18 (corresponding to “discrimination reference value setting means” of the present invention) for changing the reference change rate r. It has been.

  The change of the reference change rate r is performed by an external input device 20 different from the gas meter 10. Specifically, in the gas meter 10, the discrimination reference value setting unit 18 is provided with a phototransistor 19 (corresponding to “communication means” of the present invention) as a light receiving element, and the external input device 20 has a projection. An LED 21 as an optical element is provided. When the light emitted from the LED 21 is received by the phototransistor 19, the discrimination reference value setting unit 18 sets the reference change rate r according to the received light (for example, the blinking pattern of the LED 21).

  The above is description of the structure of the gas meter 10 of this embodiment, and the effect | action and effect are demonstrated next. As shown in FIG. 3, the gas meter 10 of the present embodiment is provided for each detached house 40 </ b> A and each house 40 </ b> B of the apartment house. The gas meter 10 is connected to a gas supply source, specifically, in the middle of a gas pipe 11 extending from the gas cylinder 30 filled with LP gas to the residences 40A and 40B.

  When installing the gas meter 10 in the detached house 40A, it is as follows. Generally, a dedicated LP gas cylinder 30 is installed in the detached house 40A. For this reason, in the detached house 40A, the supply gas pressure does not change under the influence of the gas usage status of the adjacent houses 40A and 40B. Therefore, when the gas meter 10 is installed in the detached house 40 </ b> A, “0.03” is set as the reference change rate r in the discrimination reference value setting unit 18. As a result, it is possible to appropriately discriminate between a change in flow rate due to a change in the opening degree of a valve provided in the gas device and a change in flow rate due to a disturbance, and a change in the opening degree of the valve (gas change amount ΔQ) is relatively small. Even in this case, it is possible to determine that the flow rate is changed by changing the opening degree of the valve provided in the gas device.

  On the other hand, when installing the gas meter 10 in each residence 40B of the apartment house which uses LP gas, it is as follows. Generally, in an apartment house, one LP gas cylinder 30 is commonly used in a plurality of residences 40B, so that the gas pipe 11 extending from the gas cylinder 30 is branched in the middle and extends to the plurality of residences 40B (see FIG. 3). ). For this reason, in a housing complex, if gas supply is used in a certain residence 40B and the supply gas pressure is reduced, the supply gas pressure in the adjacent residence 40B may also be lowered in conjunction with it. That is, in each residence 40B of an apartment house, compared with single-family residence 40A, gas flow volume changes a lot by factors other than the opening degree change of the valve with which the gas equipment was equipped. Accordingly, when the gas meter 10 is installed in each residence 40B of the apartment house, the reference change rate r set in the discrimination reference value setting unit 18 is a value larger than “0.03”, for example, “0.05”. And Thereby, in an apartment house, a factor other than the change in the opening of the valve provided in the gas appliance, for example, a change in the gas flow rate due to the gas usage status of the adjacent residence 40B is mistaken for a change in the flow rate due to the change in the opening of the valve. Discrimination is prevented. The reference change rate r when the gas meter 10 is installed in each residence 40B of the apartment house is not limited to “0.05”, but may be a value “greater than 0.03 and less than or equal to 0.09”. That's fine.

  Thus, according to the configuration of the present embodiment, the reference change rate r is appropriate for each of the case where the gas meter 10 (gas counter 13) is installed in each residence 40B of the apartment house and the case where it is installed in the detached house 40A. Can be changed and set to any value. As a result, regardless of whether the gas meter 10 (gas counter 13) is installed in each residence 40B or detached residence 40A of the apartment house, a change in flow rate due to a gas flow rate changing means (for example, a valve or governor) provided in the gas appliance. And a change in flow rate due to disturbance can be appropriately determined.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.
(1) In the above embodiment, the gas meter 10 of the present invention is installed in a residence that uses LP gas. However, the gas meter 10 of the present invention may be installed in a residence that uses city gas. Further, the discrimination reference value may be set to a different value depending on the type of gas (for example, LP gas or city gas).

(2) In the above embodiment, the reference rate of change r when the gas meter 10 is installed in the apartment is set to “0.05”. However, it is greater than 0.03 and 0 depending on the occupancy status of the apartment. .09 or less "may be set. For example, if the number of residents in an apartment is less than half of the total number of residences, the reference change rate r is set to “0.05”, and if the number of residences is more than half of the total number of residences, the reference change rate r May be set to “0.07”. Further, the reference change rate r may be changed according to the number of residences sharing the gas cylinder. For example, when one gas cylinder is shared by 3 or less houses, the standard change rate r is “0.06”, and when shared by 4 or more houses, the standard change rate r is “0.09”. You may make it.

(3) In the above embodiment, in the integrated flow rate calculation process M for each device (see FIG. 2), in step S3, the absolute value of the difference D between the previous flow rate measurement value Q2 and the current flow rate measurement value Q1 is: It was checked whether or not the discrimination reference value (the value obtained by multiplying the previous flow rate measurement value Q2 by the reference change rate r) was exceeded. From the previous flow rate measurement value Q2 and the current flow rate measurement value Q1,
R = (Q2-Q1) / Q2,
Thus, the flow rate change rate R may be calculated to check whether or not the change rate R exceeds the reference change rate r set by the discrimination reference value setting unit 18 (R> r). In this case, step S3 of the integrated flow rate calculation process M for each device corresponds to the “first gas device flow rate change determining means” of the present invention. When “0.03” is set as the reference change rate r, the value “0.03” corresponds to the “second discrimination reference value” of the present invention, and is larger than “0.03”. When a value of “0.09 or less” is set, the value corresponds to the “first discrimination reference value” of the present invention.

  Further, in the integrated flow rate calculation processing M for each device, a step of determining whether or not the difference D exceeds a determination reference value (= Q2 × r), and a change rate R of the flow rate is set by the determination reference value setting unit 18. It is also possible to execute both the step of determining whether or not the determined reference change rate r has been exceeded.

(4) In the above embodiment, the gas meter 10 includes the gas counter 13 and the gas flow meter 12. However, the gas counter 13 may be provided in a remote place away from the gas meter 10 (gas flow meter 12). Good.

(5) In the above embodiment, the communication between the gas meter 10 and the external input device 20 is performed by transmitting and receiving optical signals between the LED 21 and the phototransistor 19, but other communication modes may be used. For example, the discrimination reference value setting unit 18 of the gas meter 10 is provided with a communication terminal (for example, DT, SG terminal), and a reference change rate r is set to “0.03” or “ It may be set to any value greater than 0.03 and less than or equal to 0.09.

(6) In the above embodiment, the reference change rate r can be changed between “0.03” and “0.09”. A reference change rate r1 of 1 and a second reference change rate r2 for a detached house are set, and these two reference change rates r1, r2 are set by a dip switch or communication means provided in the discrimination reference value setting unit 18. It may be possible to switch to either of the above. Here, if the first reference change rate r1 is set to any value of “greater than 0.03 and 0.09 or less”, and the second reference change rate r2 is set to “0.03”, Good.

(7) In the above embodiment, the gas flow meter 12 is a so-called membrane type, but may be a gas flow meter of another measurement method (for example, an impeller type or an ultrasonic type).

(8) In the above-described embodiment, when it is determined that the flow rate is changed by changing the opening of the valve provided in the gas device (Yes in step S3 in FIG. 2), the use is started or used based on the change amount ΔQ. Although the stopped gas device has been specified, a gas device whose flow rate has been changed by a gas flow rate changing means (for example, a valve or a governor) may be specified among the currently used gas devices.

(9) In the above embodiment, it is determined whether the change in gas flow rate is due to a change in the opening of a valve provided in the gas device or due to disturbance. The change is due to (A) start or stop of use of the gas equipment, (B) due to gas flow rate changing means (for example, a valve or governor) provided in the gas equipment in use, (C) (A), You may make it discriminate | determine from which by the disturbance other than (B).

1 is a block diagram of a gas meter according to an embodiment of the present invention. Flow chart of integrated flow rate calculation processing by device Conceptual diagram showing how the gas meter is used Graph showing gas flow meter measurement results

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas meter 12 Gas flow meter 13 Gas counter 14 Pulse output part 15 Flow rate calculation part 17 Flow rate totalizer according to apparatus (Integrated flow rate calculation means according to apparatus)
18 Discrimination reference value setting unit (discrimination reference value setting means)
19 Phototransistor (communication means)

Claims (6)

In the gas counter that acquires the flow rate of the gas measured by the gas flow meter and determines whether or not the flow rate is changed by the gas flow rate changing means provided in the plurality of gas devices connected downstream of the gas flow meter,
From the flow rate Q2 measured by the gas flow meter and the flow rate Q1 measured by the gas flow meter after a predetermined interval after measuring the flow rate Q2, the flow rate is expressed by the following equation: R = (Q2-Q1) / Q2. A first change rate R is calculated, and it is determined whether the change rate R is a flow rate change by the gas flow rate changing means provided in any of the gas appliances, depending on whether the change rate R exceeds a determination reference value. Gas equipment flow rate change determining means,
Depending on whether or not the difference D between the flow rate Q2 measured by the gas flow meter and the flow rate Q1 measured by the gas flow meter after a predetermined interval after the flow rate Q2 is measured exceeds a discrimination reference value And a second gas equipment flow rate change judging means for judging whether or not the gas flow rate changing means provided in the gas equipment is a flow rate change means, and the discrimination reference value Can be switched between a first discrimination reference value for the case where the gas counter is installed for each residence of the apartment house and a second discrimination reference value for the case where the gas counter is installed in a detached house. A gas counter comprising: a determination reference value setting means. The gas flow meter calculates a flow rate of a gas based on a flow rate pulse output unit that outputs a flow rate pulse every time a certain amount of gas flows and a flow rate pulse output from the flow rate pulse output unit. And consists of
The predetermined interval at which the first or second gas appliance flow rate change determining means acquires the flow rate Q2 and the flow rate Q1 from the gas flow meter is an interval of flow rate pulses output from the flow rate pulse output unit. The gas counter according to claim 1, wherein the gas counter is provided. The first discrimination reference value is a value greater than 0.03 and less than or equal to 0.09, and the second discrimination reference value is 0.03. The gas counter described. In accordance with an increase in the gas flow rate measured by the gas flow meter, the first or second gas appliance flow rate change determining means discriminates from a flow rate change by a gas flow rate changing means provided in any of the gas appliances. 4. The apparatus according to claim 1, further comprising: a flow rate calculation unit for each device that calculates a flow rate of an increase, and an integrated flow rate calculation unit for a device that calculates an integrated value of the flow rate of the increase. gas counter according to any. The gas counter according to any one of claims 1 to 4, wherein the discrimination reference value setting means includes a communication means for changing the discrimination reference value by a signal from the outside of the gas counter. A gas meter comprising a gas flow meter for measuring a gas flow rate and the gas counter according to any one of claims 1 to 5.

Images