JP6498003B2 - Gas meter and gas meter installation confirmation system - Google Patents

Description

  The present invention relates to a gas meter and a gas meter installation confirmation system.

  A gas meter is a device that measures the consumption of city gas, propane gas, and the like, and a microcomputer meter equipped with a small computer is spreading. The microcomputer meter detects gas flow abnormalities or earthquakes due to forgetting to turn off the gas or damages the gas pipe, etc., and shuts off the gas, or performs automatic meter reading or automatic notification when an abnormality occurs through the communication line. As a device for detecting an earthquake installed in a gas meter, a gas meter seismic device is known (see, for example, Patent Document 1 below).

  The seismic device for a gas meter described in Patent Document 1 is limited in ensuring horizontality of the seismic device, and minimizes variations in installation of the gas meter and installation of the seismic device installed in the gas meter. The issue is that management is required. Moreover, after confirming that there is no problem at the time of initial installation of the gas meter, there is a possibility that the installation state may be changed by an external factor, and that a troublesome vibration may be applied to the gas meter.

  In order to solve these problems, a gas meter seismic device described in Patent Document 1 includes a shut-off valve that opens and closes a gas flow path of a gas meter, a drive unit that opens and closes the shut-off valve, and a triaxial direction. An acceleration sensor that can detect the displacement of the gas meter, an installation state determination unit that determines the installation state of the gas meter, an installation state setting switch, and an earthquake determination unit that determines an earthquake. When the installation of the gas meter is completed, the acceleration sensor detects the amount of displacement in three axial directions when the gas meter is installed by operating the installation state setting switch. In addition, when the displacement amount is a displacement amount determined to be normal, the installation state determination unit stores the displacement amount as an installation constant and opens the shut-off valve by the driving unit.

  The seismic device for a gas meter described in Patent Document 1 can determine the suitability of the installation state of the gas meter by the installation state determination means. Therefore, it is possible to prevent the gas meter from being installed in an abnormal state, and by storing the installation constant, it is possible to appropriately determine the abnormal state corresponding to the variation in the installation state. Therefore, the seismic device that detects the earthquake of the gas meter is not affected by the variation in installation of the gas meter or the installation of the seismic device, and does not limit the direction of installation of the seismic device. Can be blocked.

JP 2012-18033 A

  As described above, in order to accurately measure the gas flow rate or accurately detect an earthquake with a gas meter, it is necessary to install the gas meter in a predetermined angular range close to the horizontal. In the installation work of the gas meter, an operator checks the gas meter or uses an instrument such as a level to check whether or not the gas meter is normally installed.

  Even with a gas meter equipped with the gas meter seismic device described in Patent Document 1, if the installation is not performed within a predetermined angle range close to the horizontal at the time of installation, the installation state determination means does not determine the normal state and the shut-off valve is not opened. Therefore, when installing the gas meter, it is necessary for an operator to check whether or not the gas meter has been installed normally.

  In addition, after confirming the installation of the gas meter for normal installation, the worker needs to confirm the installation of whether or not the gas meter is normally metered by, for example, visually checking the metering display of the gas meter. In addition, the worker needs to input the result of installation confirmation regarding the normal installation and measurement of the gas meter into the information terminal of the office. As described above, the conventional gas meter installation confirmation has many problems to be confirmed by the worker, and is troublesome, requires a long work time, and is prone to human error.

  The present invention has been made in view of the above-described problems, and provides a gas meter and a gas meter installation confirmation system that can facilitate installation confirmation, reduce work time, and prevent human errors during installation confirmation. For the purpose.

  In order to achieve the above object, a gas meter of the present invention includes an angle sensor for measuring an installation angle, a pressure sensor for measuring a gas pressure, a flow rate sensor for measuring a gas flow rate, an informing unit for informing the installation state, and an external A gas meter comprising: a communication unit that performs data communication with the apparatus; and a control unit that controls the communication unit, wherein the control unit is configured such that the installation angle is within a normal angle range and the installation angle is within a predetermined time. Determining a first condition that does not change over time, a second condition in which the gas pressure is within a normal pressure range for a predetermined time, and a third condition in which the gas flow rate is in a normal flow range. When all of the first, second, and third conditions are satisfied, it is determined that the installation state is normal, the notification unit notifies the installation state, and the communication unit transmits the installation state to the external device. To send And butterflies.

  To install the gas meter of the present invention, an operator first adjusts the installation angle of the gas meter, and installs the gas meter so that the installation angle of the gas meter is within a normal angle range of, for example, ± 5 ° with respect to the horizontal. Install in the gas supply piping. Here, the control unit of the gas meter acquires the installation angle measured by the angle sensor, and whether or not the acquired installation angle is within a normal angle range and the first condition that the installation angle does not change over a predetermined time is satisfied. Determine whether.

  The angle sensor for measuring the installation angle of the gas meter and its change may be an acceleration sensor. For example, an acceleration sensor that measures an inclination angle based on acceleration in three axial directions can be used as the angle sensor of the gas meter of the present invention. Thereby, it can measure correctly that an installation angle and an installation angle do not change over predetermined time.

  Further, when it is determined that the first condition is satisfied, the control unit of the gas meter may notify the worker that the first condition is satisfied by the notification unit. As the notification unit, a sound generation unit such as a buzzer or a speaker, a display unit such as a display lamp or a liquid crystal display device, or a combination thereof can be used. For example, when the notification unit is a liquid crystal display device, the control unit displays the current installation angle of the gas meter on the screen of the liquid crystal display device. Furthermore, the control unit can display that the first condition is satisfied on the screen of the liquid crystal display device when the installation angle does not change within a normal angle range and for a predetermined time.

  The gas meter may include a gas cutoff valve that is opened and closed by the control unit. In this case, the control unit keeps the gas shut-off valve closed until the first condition is satisfied, and opens the gas shut-off valve when the first condition is satisfied and the return operation is performed. The gas meter return operation is a general operation performed by the user by a button operation or the like when the gas meter safety function is activated and the gas supply is shut off. This is an operation for opening the shut-off valve and making the gas usable from the shut-off state.

  The controller of the gas meter acquires the gas pressure measured by the pressure sensor after the determination of the first condition, and whether or not the acquired gas pressure is within a normal pressure range for a predetermined time is satisfied. Determine. When it is determined that the second condition is satisfied, the control unit may notify the worker that the second condition is satisfied by the notification unit. For example, when the notification unit is a liquid crystal display device, the control unit displays the current gas pressure of the gas meter on the screen of the liquid crystal display device, and the gas pressure is within a normal pressure range for a predetermined time. It can be displayed that the second condition is satisfied.

  The controller of the gas meter acquires the gas flow rate measured by the flow sensor after the determination of the second condition, and determines whether or not the acquired gas flow rate satisfies a third condition that is in a normal flow rate range. When it is determined that the third condition is satisfied, the control unit may notify the worker that the third condition is satisfied by the notification unit. For example, when the notification unit is a liquid crystal display device, the control unit displays the current gas flow rate of the gas meter on the screen of the liquid crystal display device, and satisfies the third condition when the gas flow rate is greater than 0. Can be displayed.

  When the gas meter includes the shut-off valve, the control unit can determine the second condition and the third condition when the gas shut-off valve is open. That is, the control unit of the gas meter opens the gas cutoff valve when the first condition is satisfied and a return operation is performed. Thereby, gas is supplied to gas pipes, such as a home, a store, or a factory, from a gas supply piping via a gas meter. In this state, the control unit of the gas meter can determine whether the gas meter has returned to normal by determining the second condition. Further, for example, whether or not the gas meter is in a normal installation state when the control unit of the gas meter determines the third condition while using a gas device connected to a gas pipe at home, a store, a factory, or the like. Can be determined.

  The control unit of the gas meter determines that the installation state of the gas meter is normal when all of the first, second, and third conditions are satisfied. When the control unit determines that the gas meter installation state is normal, the control unit notifies the worker that the gas meter installation state is normal. In addition, the control unit transmits to the external device that the installation state is normal by a communication unit that performs data communication with the external device.

  Here, as the external device, a device capable of data communication with the communication unit of the gas meter, for example, a portable information terminal of a worker, a server on the WEB, or the like can be assumed. The communication unit of the gas meter is preferably a wireless communication unit that performs wireless communication with an external device, but may be a wired communication unit that performs wired communication with the external device. When the communication unit is a wireless communication unit, it is not necessary to connect a signal line for the communication unit to the gas meter, and the installation of the gas meter can be facilitated.

  As described above, in the gas meter according to the present invention, when the control unit determines the first, second, and third conditions and the first, second, and third conditions are all satisfied, the control unit is installed normally. It determines that it is in a state and notifies the worker. Therefore, it is not necessary for the worker to determine these conditions, and the burden on the worker when installing the gas meter can be reduced.

  Further, when the control unit of the gas meter of the present invention determines that the gas meter is in a normal installation state, the communication unit transmits the installation state to the external device. As a result, the result of the installation confirmation regarding the normal installation and measurement of the gas meter is automatically transmitted from the communication unit of the gas meter to the external device, so that the operator does not need to input the result of the installation confirmation to the computer terminal or the like of the office.

  As can be understood from the above description, according to the present invention, it is possible to provide a gas meter capable of easily confirming the installation, reducing the work time, and preventing human error during the confirmation of installation. Further, by constructing a gas meter installation confirmation system including the gas meter of the present invention and a server that receives and stores the installation state data transmitted from the communication unit of the gas meter, the effect of the gas meter of the present invention is more effective. Can enjoy.

The schematic block diagram of the gas meter which concerns on embodiment of this invention, and its installation confirmation system. The flowchart which shows the determination by the control part of the gas meter shown in FIG.

  Hereinafter, a gas meter and a gas meter installation confirmation system of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a gas meter 10 and a gas meter installation confirmation system 100 according to an embodiment of the present invention. As shown in FIG. 1, the gas meter 10 of the present embodiment reports an angle sensor 11 that measures an installation angle, a pressure sensor 12 that measures a gas pressure, a flow rate sensor 13 that measures a gas flow rate, and an installation state. The notification part 14, the communication part 15 which performs data communication with an external device, and the control part 16 which controls these are provided. The gas meter installation confirmation system 100 according to the present embodiment includes the gas meter 10 and a server 20 that receives and stores the installation state data transmitted from the communication unit 15.

  The angle sensor 11 is not particularly limited as long as it can measure the installation angle of the gas meter 10 and its change with time. For example, a tilt angle sensor of a film spring mass capacity type or a liquid-filled capacity type, an acceleration sensor, An angular velocity sensor or the like can be used. The angle sensor 11 is preferably an acceleration sensor. By using the acceleration sensor, the angle sensor 11 can be reduced in size, and the installation angle of the gas meter 10 and its change with time can be accurately measured.

  The pressure sensor 12 is not particularly limited as long as it can measure the gas pressure in the gas meter 10. For example, a manometer or the like can be used. The flow sensor 13 is not particularly limited as long as it can measure the gas flow rate in the gas meter 10. For example, in the case of a membrane flow meter, an ultrasonic flow meter such as a magnetic switch such as a reed switch or an MR sensor is used. If so, an ultrasonic sensor or the like can be used.

  The notification unit 14 is not particularly limited as long as it can notify the worker of the installation state of the gas meter 10, for example, a sound generation unit such as a buzzer or a speaker, a display lamp such as an LED, a liquid crystal display device, or the like. A display portion or a combination thereof can be used. From the viewpoint of the amount of information that can be notified to the worker, the notification unit 14 is preferably a liquid crystal display device.

  Under the control of the control unit 16, the communication unit 15 transmits an installation state of a gas meter 10 described later to the server 20 that is an external device. The communication unit 15 may be a wired communication unit that performs wired communication with the server 20, but is preferably a wireless communication unit that performs wireless communication with the server 20.

  The control unit 16 is configured by a small computer including an arithmetic device such as a CPU and a storage device such as a memory, and controls the angle sensor 11, pressure sensor 12, flow sensor 13, notification unit 14, and communication unit 15. . The control unit 16 determines that the installation state of the gas meter 10 is normal based on the three conditions of the first condition, the second condition, and the third condition, and notifies the worker of the installation state by the notification unit 14. At the same time, the data is transmitted to the server 20 which is an external device by the communication unit 15. For this purpose, the control unit 16 stores various reference data and programs.

  Specifically, the control unit 16 serves as a reference data for determining the first condition, which is a normal angle range that is a range of a normal installation angle of the gas meter 10 and a determination reference for the presence or absence of a change in the installation angle. A predetermined time is stored. The normal angle range can be set, for example, within ± 5 ° with respect to the horizontal, and the predetermined time serving as a criterion for determining whether or not the installation angle has changed can be set to 3 minutes, for example. Further, the control unit 16 determines whether or not the installation angle of the gas meter 10 acquired by the angle sensor 11 is within a normal angle range and satisfies the first condition that the installation angle does not change over a predetermined time. Programs are saved.

  Further, the control unit 16 stores, as reference data for determining the second condition, a normal pressure range that is a normal gas pressure range and a predetermined time for maintaining the normal pressure range. The normal pressure range can be set to, for example, 50 Pa or more and 80 Pa or less, and the predetermined time for maintaining the normal pressure range can be set to 3 minutes, for example. Further, the control unit 16 stores a program for determining whether or not the gas pressure acquired by the pressure sensor 12 satisfies a second condition that is within a normal pressure range for a predetermined time.

  The control unit 16 stores a normal flow rate range that is a normal gas flow rate range as reference data for determining the third condition. The normal flow rate range can be, for example, greater than 0, that is, greater than or equal to the resolution of the pressure sensor 12. Further, the control unit 16 stores a program for determining whether or not the gas flow rate acquired by the flow rate sensor 13 satisfies the third condition that is a normal flow rate range.

  In addition, when all of the first, second and third conditions are satisfied, the control unit 16 determines that the installation state of the gas meter 10 is normal, notifies the installation state by the notification unit 14, and performs communication. A program for transmitting the installation state to the external device by the unit 15 is stored. Further, the control unit 16 can store a program for displaying on the screen of the liquid crystal display device which is the notification unit 14 that the first condition, the second condition, and the third condition are satisfied. .

  The server 20 is an external device of the gas meter 10 and constitutes a gas meter installation confirmation system 100 together with the gas meter 10. The server 20 includes a communication unit 21 that receives data transmitted from the communication unit 15 of the gas meter 10, a storage unit 22 that stores data received by the communication unit 21, and a control that controls the communication unit 21 and the storage unit 22. Part 23. The communication unit 21 of the server 20 receives data related to the installation state transmitted from the communication units 15 of the plurality of gas meters 10. The control unit 23 includes a calculation unit such as a CPU, for example, and stores the received installation state data for each gas meter 10 in the storage unit 22 based on a program stored in the storage unit 22 to update the data.

  Hereinafter, the operation of the gas meter 10 and the gas meter installation confirmation system 100 of the present embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing control by the control unit 16 when the gas meter 10 is attached.

  An operator who performs the work of installing the gas meter 10 of the present embodiment, when installing the gas meter 10, installs the gas meter 10 so that the installation angle of the gas meter 10 is within a normal angle range within ± 5 ° with respect to the horizontal, for example. It attaches to supply piping etc. and the control by the control part 16 is started (step S0). The control unit 16 acquires the installation angle measured by the angle sensor 11 based on the stored program, and the acquired installation angle is within a normal angle range and the installation angle does not change over a predetermined time. It is determined whether or not the condition is satisfied (step S1).

  When the first condition is satisfied, the control unit 16 turns on the flag 1 for the first condition (step S2), and proceeds to the determination of the second condition (step S3). At this time, the control unit 16 displays the current installation angle of the gas meter 10 on the screen of the liquid crystal display device which is the notification unit 14, and the installation angle is within a normal angle range and does not change over a predetermined time. The operator can be notified that the first condition is satisfied on the screen of the liquid crystal display device. Thereby, the attachment work and installation confirmation work of the gas meter 10 can be made easy.

  On the other hand, when the first condition is not satisfied, the control unit 16 proceeds to determination of the second condition without turning on the flag 1 for the first condition (step S3). When the gas meter 10 has a shut-off valve that is opened and closed by the control unit 16, the control unit 16 maintains the gas shut-off valve in a closed state until the first condition is satisfied and the flag 1 is turned on. When the flag 1 is turned on and the return operation is performed by the operator, the gas shut-off valve is opened.

  Next, the control unit 16 determines the second condition (step S3). Specifically, the control unit 16 acquires the gas pressure measured by the pressure sensor 12 based on the stored program, and the second condition is that the acquired gas pressure is within the normal pressure range for a predetermined time. It is determined whether or not the above is satisfied. Thereby, the control part 16 determines whether the gas meter 10 returned to normal. When the gas meter 10 returns to normal and the second condition is satisfied, the control unit 16 turns on the flag 2 for the second condition (step S4), and shifts to the determination of the third condition (step S5).

  At this time, the control unit 16 displays the current gas pressure of the gas meter 10 on the screen of the liquid crystal display device which is the notification unit 14, and the liquid crystal is displayed when the gas pressure is within the normal pressure range for a predetermined time. The operator can be informed that the second condition is satisfied on the screen of the display device. Thereby, the installation confirmation work of the gas meter 10 can be facilitated. On the other hand, when the gas meter 10 does not return to normal and the second condition is not satisfied, the control unit 16 proceeds to determination of the third condition without turning on the flag 2 for the second condition (step S5).

  Next, the control unit 16 determines the third condition (step S5). Specifically, the control unit 16 acquires the gas flow rate measured by the flow sensor 13 based on the stored program, and determines whether or not the acquired gas flow rate satisfies the third condition that is the normal flow rate range. To do. When the third condition is satisfied, the control unit 16 turns on the flag 3 for the third condition (step S6), and shifts to determination of whether or not the installation state of the gas meter 10 is normal (step S7).

  At this time, the control unit 16 displays the current gas flow rate of the gas meter 10 on the screen of the liquid crystal display device that is the notification unit 14, and when the gas flow rate is within the normal flow rate range, The operator can be notified that the third condition is satisfied. Thereby, the installation confirmation work of the gas meter 10 can be facilitated. On the other hand, for example, when there is no input from the flow sensor 13 and the third condition is not satisfied, the control unit 16 determines whether or not the installation state of the gas meter 10 is normal without turning on the flag 3 for the third condition. (Step S7).

  Next, the control part 16 determines whether the installation state of the gas meter 10 is normal (step S7). Specifically, based on the stored program, the control unit 16 determines whether or not all the flags 1 to 3 are ON, that is, whether or not all the first, second, and third conditions are satisfied. To do. When all of the first, second, and third conditions are satisfied, the control unit 16 determines that the installation state of the gas meter 10 is normal, and installs the gas meter 10 on the screen of the liquid crystal display device that is the notification unit 14. A message indicating that the state is normal is displayed and the worker is notified (step S8).

  After the notification of the installation state by the notification unit 14, the control unit 16, based on the stored program, for example, after a predetermined time of about 30 minutes has elapsed, the communication unit 15 changes the installation state to the server 20 that is an external device. (Step S9). The control unit 16 transmits the pressure information acquired from the pressure sensor 12, for example, the static pressure after returning to the gas meter 10, the dynamic pressure at the time of integration check, and the like to the server 20 through the communication unit 15 together with the installation state. Also good. This makes it possible to record the gas supply pressure value at the location where the gas meter 10 is installed, and use this data to determine whether or not the conditions of the supply agreement are satisfied. Is possible.

  Based on the program stored in the storage unit 22, the server 20 uses the communication unit 21 to transmit data such as the installation state and pressure information of the gas meter 10 transmitted from the communication unit 15 of the gas meter 10 under the control of the control unit 23. The received data is stored in the storage unit 22 and the data of the gas meter 10 is updated. (Step 10).

  On the other hand, the control unit 16 of the gas meter 10 determines that at least one of the flags 1 to 3 is OFF in the determination of the installation state of the gas meter 10 (step S7), that is, at least one of the first, second, and third conditions. If the condition is not satisfied, it is determined that the installation state of the gas meter 10 is abnormal. At this time, the control unit 16 of the gas meter 10 displays on the screen of the liquid crystal display device, which is the notification unit 14, that the installation state of the gas meter 10 is abnormal and which conditions are not met to notify the worker. May be. The worker receives an abnormality determination of the installation state by the control unit 16 and re-adjusts the installation state of the gas meter 10 to satisfy the unsatisfied condition (step S0).

  As described above, the control unit 16 of the gas meter 10 of the present embodiment has the first condition that the installation angle of the gas meter 10 is within the normal angle range and the installation angle does not change over a predetermined time, and the gas pressure is predetermined. And a third condition in which the gas flow rate is within the normal flow range. The control unit 16 of the gas meter 10 determines that the installation state is normal when all of the first, second, and third conditions are satisfied, and notifies the communication unit 15 of the installation state by the notification unit 14. To transmit the installation state to the server 20, which is an external device.

  That is, according to the gas meter 10 and the gas meter installation confirmation system 100 of the present embodiment, the gas meter 10 itself determines the normality of the installation state and the integrated state of the gas after installation by the control unit 16, and information on the determination result is obtained. The information can be displayed on the liquid crystal display device which is the notification unit 14. Therefore, the worker who performs the installation work of the gas meter 10 can easily and surely confirm whether or not the gas meter 10 is installed normally by notifying the information by the notification unit 14, and can reduce the work time. .

  Further, according to the gas meter 10 and the gas meter installation confirmation system 100 of the present embodiment, the gas meter 10 itself determines the normality of the installation state and the integrated state of the gas after installation by the control unit 16, and information on the determination result is obtained. As the installation state of the gas meter 10, it can be transmitted to the server 20, which is an external device, by the communication unit 15. Therefore, the registration of the information regarding the installation state of the gas meter 10 to the server 20 can be automated, the working time by the worker can be shortened, and the occurrence of human errors such as forgetting confirmation or confirmation mistakes can be prevented. it can.

  In addition, the gas meter 10 of the present embodiment includes a gas shut-off valve that is opened and closed by the control unit 16, and the control unit 16 of the gas meter 10 maintains a state in which the gas shut-off valve is closed until the first condition is satisfied. When one condition is met and a return operation is performed, the gas shut-off valve is opened. Thus, the gas can be shut off by the shutoff valve until the first condition that the installation angle of the gas meter 10 is within the normal angle range and the installation angle does not change over a predetermined time, and safety can be improved. .

  In addition, the control unit 16 of the gas meter 10 according to the present embodiment may determine the second condition and the third condition when the gas shut-off valve is open. Thereby, in the gas meter 10, it can prevent that determination of a 2nd condition and a 3rd condition is performed in the state which does not satisfy | fill a 1st condition. Therefore, it is possible to avoid reworking the work of attaching the gas meter 10 and shorten the work time by the worker.

  In addition, when the angle sensor 11 of the gas meter 10 is an acceleration sensor, it is possible to accurately measure that the installation angle and the installation angle do not change over a predetermined time. When the notification unit 14 of the gas meter 10 is a liquid crystal display device, the control unit 16 displays the current installation angle of the gas meter 10, the current gas pressure of the gas meter 10, and the gas meter 10 on the screen of the liquid crystal display device. Various information such as the current gas flow rate and whether the first, second, and third conditions are satisfied can be displayed to visually notify the worker. Further, when the communication unit 15 of the gas meter 10 is a wireless communication unit that performs wireless communication with an external device, it is not necessary to connect a signal line for the communication unit 15 to the gas meter 10, and the gas meter 10 can be easily installed. can do.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

10 Gas meter 11 Angle sensor (acceleration sensor)
12 Pressure sensor 13 Flow rate sensor 14 Notification section (liquid crystal display device)
15 Communication unit (wireless communication unit)
16 Control unit 20 Server (external device)
100 Gas meter installation confirmation system S1 First condition S3 Second condition S5 Third condition

Claims (7)

An angle sensor that measures the installation angle, a pressure sensor that measures the gas pressure, a flow sensor that measures the gas flow rate, a notification unit that notifies the installation state, a communication unit that performs data communication with an external device, and these A gas meter comprising a control unit for controlling,
The controller is
A first condition in which the installation angle is within a normal angle range and the installation angle does not change over a predetermined time; a second condition in which the gas pressure is within a normal pressure range over a predetermined time; and the gas Determining the third condition that the flow rate is within the normal flow rate range;
When all of the first, second, and third conditions are satisfied, it is determined that the installation state is normal, the notification unit notifies the installation state, and the communication unit determines the installation state as the external A gas meter that transmits to a device. A gas shut-off valve opened and closed by the control unit;
The control unit maintains the gas cutoff valve closed until the first condition is satisfied, and opens the gas cutoff valve when the first condition is satisfied and a return operation is performed. The gas meter according to claim 1.   The gas meter according to claim 2, wherein the control unit determines the second condition and the third condition when the gas cutoff valve is in an open state.   The gas meter according to any one of claims 1 to 3, wherein the angle sensor is an acceleration sensor.   The gas meter according to any one of claims 1 to 4, wherein the notification unit is a liquid crystal display device.   The gas meter according to claim 1, wherein the communication unit is a wireless communication unit that performs wireless communication with the external device.   A gas meter installation confirmation system comprising: the gas meter according to any one of claims 1 to 6; and a server that receives and stores the installation state data transmitted from the communication unit. .

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