JP7249594B2 - Gas safety device and gas safety system - Google Patents

Gas safety device and gas safety system Download PDF

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JP7249594B2
JP7249594B2 JP2019096478A JP2019096478A JP7249594B2 JP 7249594 B2 JP7249594 B2 JP 7249594B2 JP 2019096478 A JP2019096478 A JP 2019096478A JP 2019096478 A JP2019096478 A JP 2019096478A JP 7249594 B2 JP7249594 B2 JP 7249594B2
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gas
pressure
true value
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absolute pressure
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JP2020190501A (en
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健太 内田
憲司 安田
太一 行徳
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Panasonic Intellectual Property Management Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/20—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows
    • G01F3/22—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure

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  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Description

本発明は、ガス流量を計測し、異常流量が計測された場合にはガス通路を遮断し、ガス使用上の安全性を確保するガス保安装置に関するものである。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas safety device that measures a gas flow rate and, when an abnormal flow rate is detected, shuts off a gas passage to ensure safety in using gas.

特許文献１は、ガスの使用量を測定するガスメータが、異常と判定してガス通路を遮断し、安全性を確保するガス保安装置を開示する。このガス保安装置は、超音波センサと、超音波センサ駆動回路が構成された回路基板を一体とした超音波流量計測部と、供給圧側と、大気圧の差圧を測定する圧力センサと、圧力センサで測定した圧力が異常であると判断した場合は、流路を遮断してガスの供給を停止する制御機能と、通報する機能を備える。 Patent Literature 1 discloses a gas safety device in which a gas meter that measures the amount of gas used determines that there is an abnormality and shuts off the gas passage to ensure safety. This gas safety device includes an ultrasonic flow rate measurement unit that integrates an ultrasonic sensor and a circuit board on which an ultrasonic sensor drive circuit is configured, a pressure sensor that measures the differential pressure between the supply pressure side and the atmospheric pressure, and a pressure If the pressure measured by the sensor is judged to be abnormal, it has a control function to shut off the flow path and stop the gas supply, and a function to notify.

特開２０１４－９８５６３号公報JP 2014-98563 A

本開示は、絶対圧圧力センサを用いてガスの供給圧を測定することに有効なガス保安装置を提供する。 The present disclosure provides a gas safety device effective in measuring gas supply pressure using an absolute pressure sensor.

本開示におけるガス保安装置は、ガスを流すための配管上に設置されたガス保安装置である。前記ガス保安装置は、前記ガスを流すための流路と、前記流路を流れる前記ガスの流量を測定するための流量計測部と、前記流路の内部に配置され前記ガスの絶対圧力を測定する第１の圧力センサと、前記流路の外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、前記ガスのゲージ圧の真値を、前記配管上に設置されたガス供給圧のゲージ圧の真値を測定する装置から取得するガス圧力真値取得手段と、前記第１の圧力センサと前記第２の圧力センサの測定値の差と前記真値から前記測定値の補正値を算出し、前記第１の圧力センサと前記第２の圧力センサの測定値の差と前記補正値に基づきガス供給圧を算出するガス圧判定手段と、前記流路を遮断する遮断弁と、前記流量計測部を制御すると共に、前記流量計測部で測定した流量や前記ガス圧判定手段で算出したガス供給圧から異常と判定した場合に前記遮断弁で前記流路を遮断する制御回路と、を備える。 A gas safety device in the present disclosure is a gas safety device installed on a pipe for flowing gas. The gas safety device includes a flow path for flowing the gas, a flow rate measuring unit for measuring the flow rate of the gas flowing through the flow path, and a flow measurement unit arranged inside the flow path to measure the absolute pressure of the gas. a second pressure sensor arranged outside the flow passage for measuring the absolute pressure of the atmospheric pressure ; gas pressure true value acquiring means for acquiring from a device for measuring true value of gauge pressure of pressure ; difference between measured values of said first pressure sensor and said second pressure sensor and correction of said measured value from said true value gas pressure determination means for calculating a gas supply pressure based on the difference between the measured values of the first pressure sensor and the second pressure sensor and the correction value; and a shutoff valve for shutting off the flow path. a control circuit that controls the flow rate measuring unit and shuts off the flow path with the shutoff valve when the flow rate measured by the flow rate measuring unit or the gas supply pressure calculated by the gas pressure determination means is determined to be abnormal; , provided.

また、本開示におけるガス保安装置は、ガスを流すための配管上に設置されたガス保安装置である。前記ガス保安装置は、前記ガスを流すための流路と、前記流路を流れる前記ガスの流量を測定するための流量計測部と、前記流路の内部に配置され前記ガスの絶対圧力を測定する第１の圧力センサと、前記流路の外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、ガスの絶対圧力の真値を、前記配管上に設置されたガス供給圧と大気圧の絶対圧力の真値を測定する装置から取得するガス絶対圧力真値取得手段と、大気の絶対圧力の真値を前記装置から取得する大気絶対圧力真値取得手段と、前記第１の圧力センサの測定値と前記ガスの絶対圧力の真値の差から前記第１の圧力センサの第１の補正値を算出し、前記第２の圧力センサの測定値と前記大気の絶対圧力の真値の差から前記第２の圧力センサの第２の補正値を算出し、前記第１の圧力センサの測定値と前記第２の圧力センサの測定値と前記第１の補正値と前記第２の補正値とからガス供給圧を算出するガス圧判定手段と、前記流路を遮断する遮断弁と、前記流量計測部を制御すると共に、前記流量計測部で測定した流量や前記ガス圧判定手段で算出したガス供給圧から異常と判定した場合に前記遮断弁で前記流路を遮断する制御回路と、を備える。
Also, the gas safety device in the present disclosure is a gas safety device installed on a pipe for flowing gas. The gas safety device includes a flow path for flowing the gas, a flow rate measuring unit for measuring the flow rate of the gas flowing through the flow path, and a flow measurement unit arranged inside the flow path to measure the absolute pressure of the gas. a second pressure sensor arranged outside the flow path to measure the absolute pressure of the atmospheric pressure; gas absolute pressure true value acquiring means for acquiring from a device for measuring the true value of the absolute pressure of the atmospheric pressure; atmospheric absolute pressure true value acquiring means for acquiring the true value of the atmospheric absolute pressure from the device ; calculating the first correction value of the first pressure sensor from the difference between the measured value of the pressure sensor and the true value of the absolute pressure of the gas, and the difference between the measured value of the second pressure sensor and the absolute pressure of the atmosphere A second correction value of the second pressure sensor is calculated from the difference between the true values, and the measurement value of the first pressure sensor, the measurement value of the second pressure sensor, the first correction value, and the first correction value are calculated. gas pressure determination means for calculating the gas supply pressure from the correction value of 2, a shutoff valve for shutting off the flow path, and controlling the flow rate measurement unit, and determining the flow rate measured by the flow rate measurement unit and the gas pressure. a control circuit for shutting off the flow path with the shutoff valve when it is determined that the gas supply pressure calculated by the means is abnormal.

本開示は、ガス保安装置周辺が高温になってもガスが噴出することのないガス保安装置において、ガス供給圧の変化を精度よく測定することができる。 INDUSTRIAL APPLICABILITY According to the present disclosure, a change in gas supply pressure can be accurately measured in a gas safety device that does not blow out gas even when the temperature around the gas safety device becomes high.

実施の形態１におけるガス保安装置の構成図Configuration diagram of gas safety device in Embodiment 1 実施の形態１におけるガス保安システムの構成図Configuration diagram of gas safety system in Embodiment 1 実施の形態１におけるガス保安システムの別の構成を示す構成図FIG. 2 is a configuration diagram showing another configuration of the gas safety system according to Embodiment 1. FIG. 実施の形態２におけるガス保安装置の構成図Configuration diagram of a gas safety device according to Embodiment 2 実施の形態２におけるガス保安システムの構成図Configuration diagram of gas safety system in Embodiment 2 実施の形態２におけるガス保安システムの別の構成を示す構成図A configuration diagram showing another configuration of the gas safety system in Embodiment 2

（本開示の基礎となった知見等）
ガス保安装置に内蔵された圧力センサはガスの圧力を大気圧基準として測定する差圧測定型である為、ガスを圧力センサに導入する貫通孔を有しており、周囲の火災等により、ガス保安装置周辺が非常に高温になった場合、圧力センサが変形または焼失することによって、貫通孔からガスが漏れ出し、ガス爆発等の二次被害を拡大してしまう可能性がある。そこで、貫通孔が不要な構成として、大気圧を測定する絶対圧圧力センサとガスの圧力を測定する絶対圧圧力センサの測定値の差からガス供給圧の変化を測定する手段がある。 (Knowledge, etc. on which this disclosure is based)
Since the pressure sensor built into the gas safety device is a differential pressure measurement type that measures the gas pressure based on atmospheric pressure, it has a through hole for introducing gas into the pressure sensor. When the temperature around the safety device becomes extremely high, the pressure sensor may be deformed or burnt out, causing gas to leak from the through-hole and possibly exacerbate secondary damage such as gas explosion. Therefore, as a configuration that does not require a through hole, there is a means for measuring the change in gas supply pressure from the difference between the measured values of an absolute pressure sensor that measures atmospheric pressure and an absolute pressure sensor that measures gas pressure.

しかしながら、絶対圧圧力センサは経時変化によって測定精度が低下すると言う課題を発明者らは発見し、その課題を解決するために、本開示の主題を構成するに至った。 However, the inventors have discovered a problem that the absolute pressure sensor deteriorates in measurement accuracy due to aging, and have come to constitute the main subject of the present disclosure in order to solve the problem.

そこで本開示は、絶対圧圧力センサを用いてガスの供給圧を測定することに有効なガス保安装置を提供する。 Therefore, the present disclosure provides a gas safety device that is effective in measuring gas supply pressure using an absolute pressure sensor.

以下、図面を参照しながら、実施の形態を詳細に説明する。但し、必要以上に詳細な説明は省略する場合がある。例えば、既によく知られた事項の詳細説明、または、実質的に同一の構成に対する重複説明を省略する場合がある。これは、以下の説明が必要以上に冗長になるのを避け、当業者の理解を容易にするためである。 Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters or redundant descriptions of substantially the same configurations may be omitted. This is to avoid the following description from becoming more redundant than necessary and to facilitate understanding by those skilled in the art.

なお、添付図面および以下の説明は、当業者が本開示を十分に理解するために提供されるのであって、これらにより特許請求の範囲に記載の主題を限定することを意図していない。 It should be noted that the accompanying drawings and the following description are provided to allow those skilled in the art to fully understand the present disclosure and are not intended to limit the claimed subject matter thereby.

（実施の形態１）
以下、図１～３を用いて、実施の形態１を説明する。なお、本実施の形態においてガス保安装置をガスメータとして説明する。 (Embodiment 1)
Embodiment 1 will be described below with reference to FIGS. In addition, in this Embodiment, a gas safety device is demonstrated as a gas meter.

図１において、ガスメータ１００は、流路１０１、遮断弁１０２、流路１０１に流れるガスの流量を計測する流量計測部１０３、流量計測部１０３で計測した流量測定データを用いて、ガスの使用量を積算する制御回路１０４、絶対圧力が測定できるガス側を計測するガス側絶対圧圧力センサ１０５、大気圧側を計測する大気側絶対圧圧力センサ１０６、ガス雰囲気中に設置されている電子回路１０７、外部からガス圧力の真値を取得するガス圧力真値取得手段１０８、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定した２つの絶対圧力値の差分とガス圧力真値取得手段１０８で取得したゲージ圧の真値で補正値を算出しておき、２つの絶対圧力値と補正値からガス供給圧力を算出するガス圧力判定手段１０９を備える。 In FIG. 1, the gas meter 100 includes a flow path 101, a shutoff valve 102, a flow rate measurement unit 103 that measures the flow rate of the gas flowing through the flow path 101, and a gas usage amount using the flow measurement data measured by the flow rate measurement unit 103. , a gas side absolute pressure sensor 105 for measuring the gas side capable of measuring the absolute pressure, an atmosphere side absolute pressure sensor 106 for measuring the atmospheric pressure side, and an electronic circuit 107 installed in the gas atmosphere. , a gas pressure true value acquisition means 108 for acquiring the true value of the gas pressure from the outside, the difference between the two absolute pressure values measured by the gas side absolute pressure sensor 105 and the atmosphere side absolute pressure sensor 106, and the gas pressure true value acquisition. A correction value is calculated from the true value of the gauge pressure acquired by the means 108, and a gas pressure determination means 109 is provided for calculating the gas supply pressure from the two absolute pressure values and the correction value.

制御回路１０４は、流量計測部１０３で計測された流量や、ガス圧力判定手段１０９で
求めたガス供給圧やその変化でガス漏れ等の異常がないかを判定し、異常と判定した場合は、遮断弁１０２で流路１０１を遮断して、ガスの供給を停止する。 The control circuit 104 determines whether there is an abnormality such as a gas leak based on the flow rate measured by the flow rate measuring unit 103, the gas supply pressure obtained by the gas pressure determination means 109, and changes in the gas supply pressure. The shutoff valve 102 shuts off the flow path 101 to stop the gas supply.

ガス側絶対圧圧力センサ１０５は、流路１０１内のガス雰囲気中に設置されている電子回路１０７上に電子部品として実装されており、制御回路１０４からの信号で流路１０１内のガスの絶対圧力を測定する。また、大気側絶対圧圧力センサ１０６は流路１０１外の大気側に設置されている制御回路１０４上に電子部品として実装されており、制御回路からの信号で大気側の絶対圧力を測定する。 The gas-side absolute pressure sensor 105 is mounted as an electronic component on an electronic circuit 107 installed in the gas atmosphere inside the flow path 101 , and detects the absolute pressure of the gas inside the flow path 101 with a signal from the control circuit 104 . Measure the pressure. Also, the atmosphere-side absolute pressure sensor 106 is mounted as an electronic component on the control circuit 104 installed on the atmosphere side outside the flow path 101, and measures the atmosphere-side absolute pressure based on a signal from the control circuit.

次に、図２を用いて、具体的な動作説明を行う。図２は、本実施の形態のガスメータ１００を用いたガス保安システムを示すもので、ガス配管２００から分岐したガス配管２００ａ、２００ｂ、２００ｃ・・・のそれぞれにガスメータ１００が接続されており、ガスメータ１００よりも上流側のガス配管２００にはガスの供給圧を減圧する中圧整圧器２０１が設置されており、この中圧整圧器２０１がガス圧力の真値を測定可能な圧力センサ（図示せず）を有する。ガスは中圧整圧器２０１により減圧されて下流側のガス配管２００を通じて各家庭に設置されたガスメータ１００を介して、ガス器具等に供給される。 Next, with reference to FIG. 2, a specific description of the operation will be given. FIG. 2 shows a gas safety system using the gas meter 100 of the present embodiment. Gas pipes 200a, 200b, 200c, . A gas pipe 200 on the upstream side of 100 is provided with a medium pressure regulator 201 for reducing the supply pressure of gas. without). The gas is depressurized by a medium pressure regulator 201 and supplied to gas appliances and the like through a gas pipe 200 on the downstream side and a gas meter 100 installed in each home.

中圧整圧器２０１にはガス圧を高精度に測定できるセンサ、例えばガスの圧力と大気圧の差圧（即ち、ゲージ圧）を測定する圧力センサを備えている。ガス配管２００においてガスの流れが殆ど無い場合、ガス配管２００内の圧力は均一となる。そこでガスの流れが殆ど無い状態において、中圧整圧器２０１とガスメータ１００が圧力をそれぞれ測定し、ガスメータ１００が中圧整圧器２０１からゲージ圧の真値ＰＧを図示していない通信等を用いて取得することで、ガスメータ１００で測定されたガス供給圧を補正することができ、圧力測定精度を改善することが可能となる。 The intermediate pressure regulator 201 is equipped with a sensor capable of measuring the gas pressure with high accuracy, for example, a pressure sensor that measures the differential pressure (that is, gauge pressure) between the pressure of the gas and the atmospheric pressure. When there is almost no gas flow in the gas pipe 200, the pressure inside the gas pipe 200 becomes uniform. Therefore, in a state where there is almost no gas flow, the intermediate pressure regulator 201 and the gas meter 100 measure the pressure, respectively, and the gas meter 100 receives the true value PG of the gauge pressure from the intermediate pressure regulator 201 using communication (not shown) or the like. By acquiring the information, the gas supply pressure measured by the gas meter 100 can be corrected, and the pressure measurement accuracy can be improved.

即ち、ガスメータ１００において、ガス圧力判定手段１０９は、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力Ｐｇと大気の絶対圧力Ｐａの差でガス供給圧Ｐ（＝Ｐｇ－Ｐａ）を算出するが、経時変化によって絶対圧圧力センサの測定精度が低下するとガス圧力判定手段１０９で算出されたガス供給圧Ｐは正確な値にならず、このガス供給圧Ｐに基づいて異常判定を行うと誤判定の可能性を生じるが、本実施の形態によると、ガス圧力判定手段１０９で算出されたガス供給圧Ｐを中圧整圧器２０１から取得したガス供給圧の真値ＰＧとの差分を補正値Ｐｃとして補正することで正確なガス供給圧を算出することができる。 That is, in the gas meter 100, the gas pressure determination means 109 determines the gas supply pressure P from the difference between the absolute gas pressure Pg measured by the gas-side absolute pressure sensor 105 and the atmosphere-side absolute pressure sensor 106 and the absolute pressure Pa of the atmosphere. (=Pg−Pa) is calculated, but if the measurement accuracy of the absolute pressure sensor deteriorates due to changes over time, the gas supply pressure P calculated by the gas pressure determination means 109 will not be an accurate value, and this gas supply pressure P However, according to the present embodiment, the gas supply pressure P calculated by the gas pressure determination means 109 is changed from the gas supply pressure obtained from the intermediate pressure regulator 201. By correcting the difference from the true value PG as the correction value Pc, an accurate gas supply pressure can be calculated.

なお、ガスメータ１００は、図示していない記憶装置等に補正値Ｐｃを保存しておくことで、ガスの使用中等で中圧整圧器２０１から真値ＰＧが取得できない場合でも補正を行うことができる。更に、真値ＰＧが取得できた場合には新たな補正値Ｐｃとして保存することで常に最新の補正値に更新でき、経時変化に対応することができる。 By storing the correction value Pc in a storage device or the like (not shown), the gas meter 100 can perform correction even when the true value PG cannot be obtained from the intermediate pressure regulator 201 due to the use of gas or the like. . Furthermore, when the true value PG is obtained, it is stored as a new correction value Pc, so that it can be always updated to the latest correction value, and it is possible to cope with changes over time.

図３は、本実施の形態のガスメータ１００を用いたガス保安システムの別の構成を示すもので、ガス配管２００上に接続されたガスメータの内の１つのガスメータＡ２０２が、ガス供給圧のゲージ圧の真値ＰＧを測定可能な場合を示す図である。ガスメータＡ２０２は、ガス圧を高精度に測定できるセンサ、例えば、ガス圧側と大気圧の差圧を測定する圧力センサを備えており、定期的に圧力の測定精度を校正されている。 FIG. 3 shows another configuration of the gas safety system using the gas meter 100 of the present embodiment. One gas meter A202 among the gas meters connected to the gas pipe 200 measures the gauge pressure of the gas supply pressure. is a diagram showing a case where the true value PG of is measurable. The gas meter A202 is equipped with a sensor that can measure gas pressure with high accuracy, for example, a pressure sensor that measures the pressure difference between the gas pressure side and the atmospheric pressure, and the pressure measurement accuracy is calibrated periodically.

そして、図２を用いた説明と同様にガスの流れが殆ど無い状態において、ガスメータＡ２０２とガスメータ１００がガス供給圧をそれぞれ測定し、ガスメータ１００がガスメータＡ２０２からガス供給圧のゲージ圧の真値ＰＧを取得することで、ガスメータ１００の圧力測定精度を改善することが可能となる。 2, the gas supply pressure is measured by the gas meter A202 and the gas meter 100 in a state where there is almost no gas flow, and the gas meter A202 detects the true value PG of the gauge pressure of the gas supply pressure. is obtained, the pressure measurement accuracy of the gas meter 100 can be improved.

なお、ガスメータＡ２０２は、ガスメータ１００と同じ構成とし、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６を定期的に校正することで、測定で得られた２つの絶対圧の差からゲージ圧の真値を算出できるようにしても良い。 The gas meter A 202 has the same configuration as the gas meter 100, and the gas side absolute pressure sensor 105 and the atmosphere side absolute pressure sensor 106 are periodically calibrated so that the difference between the two absolute pressures obtained by the measurement can be used as a gauge. The true value of the pressure may be calculated.

以上のように、本実施の形態においては、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力と大気の絶対圧力の差でガス供給圧を測定するガスメータ１００において、ガス供給圧の真値ＰＧを外部から取得することで、補正値を得ることができ、２つの絶対圧圧力センサの経時変化による誤差に対する測定精度の改善ができ、差圧測定型の圧力センサを用いる場合に必要な貫通孔が不要となり、火災等でガス保安装置の周囲が高温になってもガスが噴出することを防止でき、より安全性の高いガス保安装置が実現できる。 As described above, in the present embodiment, the gas meter measures the gas supply pressure based on the difference between the absolute pressure of the gas measured by the gas side absolute pressure sensor 105 and the atmosphere side absolute pressure sensor 106 and the absolute pressure of the atmosphere. In 100, by obtaining the true value PG of the gas supply pressure from the outside, a correction value can be obtained, and the measurement accuracy can be improved with respect to the error due to the aging of the two absolute pressure sensors. A through-hole, which is required when using a pressure sensor, is no longer necessary, and even if the surroundings of the gas safety device become hot due to a fire or the like, the gas can be prevented from blowing out, and a safer gas safety device can be realized.

なお、本実施の形態において、流量計測部を超音波流量計測として使用しても同等なことができることは言うまでもない。 Needless to say, in the present embodiment, even if the flow rate measurement section is used as an ultrasonic flow rate measurement, the same effect can be achieved.

なお、本実施の形態において、ガス側絶対圧圧力センサ１０５を流路１０１内のガス雰囲気中に設置されている電子回路１０７上に実装する構成で説明したが、流路内であれば何処に実装してもよいことはいうまでも無い。また、大気側絶対圧圧力センサ１０６を流路１０１外の大気側に設置されている制御回路１０４上に実装する構成で説明したが、大気圧を測定できれば実装する場所に制限は無い。 In the present embodiment, the gas-side absolute pressure sensor 105 is mounted on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101. Needless to say, it can be implemented. Further, although the configuration in which the atmospheric pressure absolute pressure sensor 106 is mounted on the control circuit 104 installed on the atmospheric side outside the flow path 101 has been described, there is no limit to the mounting location as long as the atmospheric pressure can be measured.

（実施の形態２）
以下、実施の形態２について、図４を用いて説明する。なお、本実施の形態においてガス保安装置をガスメータとして説明する。図４において、図１で説明した同一機能については同一番号で示す。 (Embodiment 2)
Embodiment 2 will be described below with reference to FIG. In addition, in this Embodiment, a gas safety device is demonstrated as a gas meter. In FIG. 4, the same functions as described in FIG. 1 are denoted by the same numbers.

図４において、ガスメータ３００は流路１０１、遮断弁１０２、流路１０１に流れるガスの流量を計測する流量計測部１０３、流量計測部１０３で計測した流量測定データを用いて、ガスの使用量を積算する制御回路３０４、絶対圧力が測定できるガス側を計測するガス側絶対圧圧力センサ１０５、大気圧側を計測する大気側絶対圧圧力センサ１０６、ガス雰囲気中に設置されている電子回路１０７、外部からガス供給圧の絶対圧力の真値を取得するガス絶対圧力真値取得手段３０１、外部から大気の絶対圧力の真値を取得する大気絶対圧力真値取得手段３０２、ガス圧力判定手段１０９を備える。 In FIG. 4, the gas meter 300 has a flow path 101, a shutoff valve 102, a flow rate measurement unit 103 that measures the flow rate of the gas flowing through the flow path 101, and uses the flow measurement data measured by the flow rate measurement unit 103 to measure the amount of gas used. A control circuit 304 for integration, a gas side absolute pressure sensor 105 for measuring the gas side capable of measuring absolute pressure, an atmosphere side absolute pressure sensor 106 for measuring the atmospheric pressure side, an electronic circuit 107 installed in a gas atmosphere, A gas absolute pressure true value acquiring means 301 for acquiring the true value of the absolute pressure of the gas supply pressure from the outside, an atmospheric absolute pressure true value acquiring means 302 for acquiring the true value of the atmospheric absolute pressure from the outside, and a gas pressure determining means 109 are provided. Prepare.

ガス圧力判定手段１０９は、ガス側絶対圧圧力センサ１０５で測定した絶対圧力とガス絶対圧力真値取得手段３０１で取得したガス側の絶対圧力の真値からガス側補正値を算出し、大気側絶対圧圧力センサ１０６で測定した絶対圧力と大気絶対圧力真値取得手段３０２で取得した大気側の絶対圧力の真値から大気側補正値を算出しておき、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定したぞれぞれの絶対圧力をガス側補正値と大気側補正値で補正し、その差分でガス供給圧を算出する。 The gas pressure determination means 109 calculates a gas side correction value from the absolute pressure measured by the gas side absolute pressure sensor 105 and the true value of the gas side absolute pressure acquired by the gas absolute pressure true value acquisition means 301, and calculates the gas side correction value. The atmosphere side correction value is calculated from the absolute pressure measured by the absolute pressure sensor 106 and the true value of the atmosphere side absolute pressure acquired by the atmosphere absolute pressure true value acquisition means 302, and the gas side absolute pressure sensor 105 and the atmosphere Each absolute pressure measured by the side absolute pressure sensor 106 is corrected by the gas side correction value and the atmosphere side correction value, and the gas supply pressure is calculated from the difference.

制御回路３０４は、流量計測部１０３で計測された流量や、ガス圧力判定手段１０９で求めたガス供給圧やその変化を判定し、ガス漏れ等の異常がないかを判定し、異常と判定した場合は、遮断弁１０２で流路１０１を遮断して、ガスの供給を停止する。 The control circuit 304 determines the flow rate measured by the flow rate measuring unit 103, the gas supply pressure obtained by the gas pressure determining means 109, and its change, determines whether there is an abnormality such as a gas leak, and determines that there is an abnormality. In this case, the flow path 101 is shut off by the shutoff valve 102 to stop the gas supply.

ガス側絶対圧圧力センサ１０５は、流路１０１内のガス雰囲気中に設置されている電子回路１０７上に電子部品として実装されており、制御回路１０４からの信号で流路１０１内のガスの絶対圧力を測定する。また、大気側絶対圧圧力センサ１０６は、流路１０１外の大気側に設置されている制御回路１０４上に電子部品として実装されており、制御回路からの信号で大気側の絶対圧力を測定する。 The gas-side absolute pressure sensor 105 is mounted as an electronic component on an electronic circuit 107 installed in the gas atmosphere inside the flow path 101 , and detects the absolute pressure of the gas inside the flow path 101 with a signal from the control circuit 104 . Measure the pressure. Also, the atmosphere-side absolute pressure sensor 106 is mounted as an electronic component on the control circuit 104 installed on the atmosphere side outside the flow path 101, and measures the atmosphere-side absolute pressure with a signal from the control circuit. .

次に、図５を用いて、具体的な動作説明を行う。図５は、本実施の形態のガスメータ１００を用いたガス保安システムを示すもので、ガス配管２００から分岐したガス配管２００ａ、２００ｂ、２００ｃ・・・のそれぞれにガスメータ３００が接続されており、ガスメータ１００よりも上流側のガス配管２００にはガスの供給圧を減圧する中圧整圧器４０１が設置されており、この中圧整圧器４０１がガス供給圧と大気圧の絶対圧力の真値を測定可能な絶対圧圧力センサ（図示せず）を有する。ガスは中圧整圧器４０１により減圧されて下流側のガス配管２００を通じて各家庭に設置されたガスメータ３００を介して、ガス器具等に供給される。 Next, using FIG. 5, a specific description of the operation will be given. FIG. 5 shows a gas safety system using the gas meter 100 of the present embodiment. A gas meter 300 is connected to each of gas pipes 200a, 200b, 200c, . A medium pressure regulator 401 for reducing the gas supply pressure is installed in the gas pipe 200 on the upstream side of 100, and this medium pressure regulator 401 measures the true value of the gas supply pressure and the atmospheric pressure. It has a possible absolute pressure sensor (not shown). The gas is depressurized by a medium pressure regulator 401 and supplied to gas appliances and the like through a gas meter 300 installed in each home through a gas pipe 200 on the downstream side.

中圧整圧器４０１は、ガス供給圧の絶対圧力と大気圧の絶対圧力を高精度に測定できる絶対圧圧力センサを備え、定期的に測定精度が校正されている。ガス配管２００においてガスの流れが殆ど無い場合、ガス配管２００内の圧力は均一となる。そこでガスの流れが殆ど無い状態において、ガス供給圧と大気圧の絶対圧力を中圧整圧器４０１とガスメータ３００がそれぞれ測定し、ガスメータ３００が中圧整圧器２０１からガス供給圧の絶対圧力の真値ＰＡｇと大気の絶対圧力の真値ＰＡａを図示していない通信等を用いて取得することで、ガスメータ３００のガス側絶対圧圧力センサ１０５による測定値と大気側絶対圧圧力センサ１０６による測定値を補正することができ、圧力測定精度を改善することが可能となる。 The intermediate pressure regulator 401 has an absolute pressure sensor capable of measuring the absolute pressure of the gas supply pressure and the absolute pressure of the atmospheric pressure with high accuracy, and the measurement accuracy is calibrated periodically. When there is almost no gas flow in the gas pipe 200, the pressure inside the gas pipe 200 becomes uniform. Therefore, in a state where there is almost no gas flow, the intermediate pressure regulator 401 and the gas meter 300 measure the absolute pressure of the gas supply pressure and the atmospheric pressure, respectively. By acquiring the value PAg and the true value PAa of the absolute pressure of the atmosphere using communication or the like (not shown), the value measured by the gas side absolute pressure sensor 105 of the gas meter 300 and the value measured by the atmosphere side absolute pressure sensor 106 are obtained. can be corrected, and the pressure measurement accuracy can be improved.

即ち、ガスメータ３００において、ガス圧力判定手段１０９は、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力Ｐｇと大気の絶対圧力Ｐａの差でガス供給圧Ｐを算出するが、経時変化によって絶対圧圧力センサの測定精度が低下するとガス圧力判定手段１０９で算出されたガス供給圧Ｐ（＝Ｐｇ－ｐａ）は正確な値にならず、このガス供給圧Ｐに基づいて異常判定を行うと誤判定の可能性を生じるが、本実施の形態によると、ガス側絶対圧圧力センサ１０５で測定される絶対圧力と中圧整圧器４０１から取得したガス供給圧の絶対圧力の真値ＰＡｇとの差分をガス側補正値Ｐｇｃとして補正し、大気側絶対圧圧力センサ１０６で測定される絶対圧力を中圧整圧器４０１から取得した大気圧の絶対圧力の真値ＰＡａとの差分を大気側補正値Ｐａｃとして補正することで正確なガス供給圧を算出することができる。 That is, in the gas meter 300, the gas pressure determination means 109 determines the gas supply pressure P from the difference between the absolute gas pressure Pg measured by the gas-side absolute pressure sensor 105 and the atmosphere-side absolute pressure sensor 106 and the absolute pressure Pa of the atmosphere. However, if the measurement accuracy of the absolute pressure sensor decreases due to changes over time, the gas supply pressure P (=Pg-pa) calculated by the gas pressure determination means 109 will not be an accurate value, and this gas supply pressure P However, according to the present embodiment, the absolute pressure measured by the gas side absolute pressure sensor 105 and the gas supply pressure acquired from the intermediate pressure regulator 401 are The difference from the absolute pressure true value PAg is corrected as the gas-side correction value Pgc, and the absolute pressure measured by the atmosphere-side absolute pressure sensor 106 is obtained from the intermediate pressure regulator 401 to obtain the absolute pressure true value PAa of the atmospheric pressure. The correct gas supply pressure can be calculated by correcting the difference between and as the atmosphere side correction value Pac.

なお、ガスメータ３００は、図示していない記憶装置等にガス側補正値Ｐｇｃ、大気側補正値Ｐａｃを保存しておくことで、ガスの使用中等で中圧整圧器４０１から真値ＰＡｇ、ＰＡａが取得できない場合でも補正を行うことができる。更に、真値ＰＡｇ、ＰＡａが取得できた場合には新たな補正値Ｐｇｃ、Ｐａｃとして保存することで、常に最新の補正値に更新でき、経時変化に対応することができる。 The gas meter 300 stores the gas-side correction value Pgc and the atmosphere-side correction value Pac in a storage device or the like (not shown), so that the true values PAg and PAa from the intermediate pressure regulator 401 can be obtained while the gas is being used. Even if it cannot be obtained, it can be corrected. Furthermore, when the true values PAg and PAa are acquired, they are saved as new correction values Pgc and Pac, so that they can always be updated to the latest correction values and can cope with changes over time.

図６は、本実施の形態のガスメータ３００を用いたガス保安システムの別の構成を示すもので、ガス配管２００上に、ガス供給圧と大気圧の絶対圧力の真値ＰＡｇ、ＰＡａが測定可能なガスメータＢ４０２が存在する場合の図である。ガスメータＢ４０２はガス供給圧と大気圧を高精度に測定できる絶対圧センサを有しているもので、例えば定期的に圧力精度を校正しているものとする。 FIG. 6 shows another configuration of the gas safety system using the gas meter 300 of the present embodiment. 1 is a diagram in the case where a gas meter B402 is present. The gas meter B402 has an absolute pressure sensor capable of measuring the gas supply pressure and the atmospheric pressure with high accuracy, and for example, the pressure accuracy is periodically calibrated.

そして、図５を用いた説明と同様にガスの流れが殆ど無い状態において、ガス圧力の真値を測定可能なガスメータＢ４０２とガスメータ３００が絶対圧力をそれぞれ測定し、ガスメータ３００がガスメータＢ４０２からガスの絶対圧力の真値ＰＡｇと大気の絶対圧力の真値ＰＡａを取得することで、ガスメータ３００の圧力測定精度を改善することが可能となる。 5, the gas meter B402 capable of measuring the true value of the gas pressure and the gas meter 300 each measure the absolute pressure in a state where there is almost no gas flow, and the gas meter 300 measures the gas from the gas meter B402. By obtaining the absolute pressure true value PAg and the atmospheric absolute pressure true value PAa, the pressure measurement accuracy of the gas meter 300 can be improved.

なお、ガスメータＢ４０２は、ガスメータ３００と同じ構成とし、ガス側絶対圧圧力セ
ンサ１０５と大気側絶対圧圧力センサ１０６を定期的に校正することで、常に真値ＰＡｇ、ＰＡａを計測できるようにしても良い。 The gas meter B402 has the same configuration as the gas meter 300, and the gas side absolute pressure sensor 105 and the atmosphere side absolute pressure sensor 106 are periodically calibrated so that the true values PAg and PAa can always be measured. good.

以上のように、本実施の形態においては、ガス側絶対圧圧力センサ１０５と大気側絶対圧圧力センサ１０６で測定されたガスの絶対圧力と大気の絶対圧力の差でガス供給圧を測定するガスメータ３００において、ガスと大気の絶対圧力の真値ＰＡｇ、ＰＡａを外部から取得するため、２つの絶対圧圧力センサの経時変化による誤差に対する測定精度の改善ができ、差圧測定型の圧力センサを用いる場合に必要な貫通孔が不要となり、火災等でガス保安装置の周囲が高温になってもガスが噴出することを防止でき、より安全性の高いガス保安装置が実現できる。 As described above, in the present embodiment, the gas meter measures the gas supply pressure based on the difference between the absolute pressure of the gas measured by the gas side absolute pressure sensor 105 and the atmosphere side absolute pressure sensor 106 and the absolute pressure of the atmosphere. In 300, since the true values PAg and PAa of the absolute pressures of the gas and the atmosphere are obtained from the outside, the measurement accuracy can be improved with respect to errors due to changes over time of the two absolute pressure sensors, and differential pressure measurement type pressure sensors are used. This eliminates the need for through-holes that are required in other cases, and prevents gas from blowing out even when the surroundings of the gas safety device become hot due to a fire or the like, so that a safer gas safety device can be realized.

なお、本実施の形態において、大気絶対圧力は気象情報など他の真値を有する装置から取得できることは言うまでもない。 It goes without saying that in the present embodiment, the atmospheric absolute pressure can be obtained from other devices having true values such as weather information.

なお、本実施の形態において、流量計測部を超音波流量計測として使用しても同等なことができることは言うまでもない。 Needless to say, in the present embodiment, even if the flow rate measurement section is used as an ultrasonic flow rate measurement, the same effect can be achieved.

なお、本実施の形態において、ガス側絶対圧圧力センサ１０５を流路１０１内のガス雰囲気中に設置されている電子回路１０７上に実装する構成で説明したが、流路内であれば何処に実装してもよいことはいうまでも無い。また、大気側絶対圧圧力センサ１０６を流路１０１外の大気側に設置されている制御回路１０４上に実装する構成で説明したが、大気圧を測定できれば実装する場所に制限は無い。 In the present embodiment, the gas-side absolute pressure sensor 105 is mounted on the electronic circuit 107 installed in the gas atmosphere inside the flow path 101. Needless to say, it can be implemented. Further, although the configuration in which the atmospheric pressure absolute pressure sensor 106 is mounted on the control circuit 104 installed on the atmospheric side outside the flow path 101 has been described, there is no limit to the mounting location as long as the atmospheric pressure can be measured.

本開示は、ガス保安装置は、火災等でガス保安装置の周囲が高温になっても圧力センサ用の貫通穴からガスが噴出することを防止できるため、より安全性を向上できるだけでなく、より安価なガス保安装置が実現でき、一般家庭用及び業務用ガスメータ等の用途に適用できる。 According to the present disclosure, the gas safety device can prevent gas from blowing out from the through hole for the pressure sensor even when the temperature around the gas safety device becomes high due to a fire or the like. An inexpensive gas safety device can be realized, and it can be applied to general household and commercial gas meters.

１００、３００ ガスメータ（ガス保安装置）
１０１ 流路
１０２ 遮断弁
１０３ 流量計測部
１０４、３０４ 制御回路
１０５ ガス側絶対圧圧力センサ（第１の圧力センサ）
１０６ 大気側絶対圧圧力センサ（第２の圧力センサ）
１０７ 電子回路
１０８ ガス圧力真値取得手段
１０９ ガス圧力判定手段
２００、２００ａ、２００ｂ、２００ｃ ガス配管(配管）
２０１、４０１ 中圧整圧器（圧力計測装置）
２０２ ガスメータＡ（第２のガス保安装置）
４０２ ガスメータＢ（第２のガス保安装置）
３０１ ガス絶対圧力真値取得手段
３０２ 大気絶対圧力真値取得手段 100, 300 gas meter (gas safety device)
REFERENCE SIGNS LIST 101 flow path 102 cutoff valve 103 flow rate measuring unit 104, 304 control circuit 105 gas side absolute pressure sensor (first pressure sensor)
106 atmosphere side absolute pressure sensor (second pressure sensor)
107 Electronic circuit 108 Gas pressure true value acquisition means 109 Gas pressure determination means 200, 200a, 200b, 200c Gas piping (piping)
201, 401 Medium pressure regulator (pressure measuring device)
202 gas meter A (second gas safety device)
402 gas meter B (second gas safety device)
301 Gas Absolute Pressure True Value Acquisition Means 302 Atmospheric Absolute Pressure True Value Acquisition Means

Claims (6)

ガスを流すための配管上に設置されたガス保安装置であって、
前記ガスを流すための流路と、
前記流路を流れる前記ガスの流量を測定するための流量計測部と、
前記流路の内部に配置され前記ガスの絶対圧力を測定する第１の圧力センサと、
前記流路の外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、
前記ガスのゲージ圧の真値を、前記配管上に設置されたガス供給圧のゲージ圧の真値を測定する装置から取得するガス圧力真値取得手段と、
前記第１の圧力センサと前記第２の圧力センサの測定値の差と前記真値から前記測定値の補正値を算出し、前記第１の圧力センサと前記第２の圧力センサの測定値の差と前記補正値に基づきガス供給圧を算出するガス圧判定手段と、
前記流路を遮断する遮断弁と、
前記流量計測部を制御すると共に、前記流量計測部で測定した流量や前記ガス圧判定手段で算出したガス供給圧から異常と判定した場合に前記遮断弁で前記流路を遮断する制御回路と、
を備えたガス保安装置。 A gas safety device installed on a pipe for flowing gas,
a channel for flowing the gas;
a flow rate measurement unit for measuring the flow rate of the gas flowing through the flow path;
a first pressure sensor disposed inside the flow path and measuring the absolute pressure of the gas;
a second pressure sensor positioned outside the flow path and measuring the absolute pressure of atmospheric pressure;
a gas pressure true value acquiring means for acquiring the true value of the gauge pressure of the gas from a device installed on the pipe for measuring the true value of the gauge pressure of the gas supply pressure;
A correction value for the measured value is calculated from the difference between the measured values of the first pressure sensor and the second pressure sensor and the true value, and the difference between the measured values of the first pressure sensor and the second pressure sensor is calculated. gas pressure determination means for calculating a gas supply pressure based on the difference and the correction value;
a shutoff valve that shuts off the flow path;
a control circuit that controls the flow rate measuring unit and shuts off the flow path with the shutoff valve when the flow rate measured by the flow rate measuring unit or the gas supply pressure calculated by the gas pressure determination means is determined to be abnormal;
Gas safety device with. ガスを流すための配管と、
前記配管上に設置されたガス供給圧のゲージ圧の真値を測定可能な圧力計測装置と、
前記配管上に設置された請求項１に記載のガス保安装置と、
からなり、前記ガス圧力真値取得手段は、前記圧力計測装置から前記真値を取得するガス保安システム。 piping for the flow of gas;
a pressure measuring device capable of measuring the true value of the gauge pressure of the gas supply pressure installed on the pipe;
The gas safety device according to claim 1 installed on the pipe;
wherein the gas pressure true value acquiring means acquires the true value from the pressure measuring device. ガスを流すための配管と、
前記配管上に設置され、ガス供給圧のゲージ圧の真値を測定可能な第２のガス保安装置と、
前記配管上に設置された請求項１に記載のガス保安装置と、
からなり、前記ガス圧力真値取得手段は、前記第２のガス保安装置から前記真値を取得するガス保安システム。 piping for the flow of gas;
a second gas safety device installed on the pipe and capable of measuring the true value of the gauge pressure of the gas supply pressure;
The gas safety device according to claim 1 installed on the pipe;
wherein the gas pressure true value acquisition means acquires the true value from the second gas safety device. ガスを流すための配管上に設置されたガス保安装置であって、
前記ガスを流すための流路と、
前記流路を流れる前記ガスの流量を測定するための流量計測部と、
前記流路の内部に配置され前記ガスの絶対圧力を測定する第１の圧力センサと、
前記流路の外部に配置され大気圧の絶対圧力を測定する第２の圧力センサと、
ガスの絶対圧力の真値を、前記配管上に設置されたガス供給圧と大気圧の絶対圧力の真値を測定する装置から取得するガス絶対圧力真値取得手段と、
大気の絶対圧力の真値を前記装置から取得する大気絶対圧力真値取得手段と、
前記第１の圧力センサの測定値と前記ガスの絶対圧力の真値の差から前記第１の圧力センサの第１の補正値を算出し、前記第２の圧力センサの測定値と前記大気の絶対圧力の真値の差から前記第２の圧力センサの第２の補正値を算出し、前記第１の圧力センサの測定値と前記第２の圧力センサの測定値と前記第１の補正値と前記第２の補正値とからガス供給圧を算出するガス圧判定手段と、
前記流路を遮断する遮断弁と、
前記流量計測部を制御すると共に、前記流量計測部で測定した流量や前記ガス圧判定手段で算出したガス供給圧から異常と判定した場合に前記遮断弁で前記流路を遮断する制御回路と、
を備えたガス保安装置。 A gas safety device installed on a pipe for flowing gas,
a channel for flowing the gas;
a flow rate measurement unit for measuring the flow rate of the gas flowing through the flow path;
a first pressure sensor disposed inside the flow path and measuring the absolute pressure of the gas;
a second pressure sensor positioned outside the flow path and measuring the absolute pressure of atmospheric pressure;
gas absolute pressure true value acquisition means for acquiring the true value of the absolute pressure of the gas from a device installed on the pipe for measuring the true value of the absolute pressure of the gas supply pressure and the atmospheric pressure;
atmospheric absolute pressure true value acquisition means for acquiring the true value of the atmospheric absolute pressure from the device ;
calculating a first correction value of the first pressure sensor from the difference between the measured value of the first pressure sensor and the true value of the absolute pressure of the gas; A second correction value for the second pressure sensor is calculated from a difference between the true values of the absolute pressure, and the measured value for the first pressure sensor, the measured value for the second pressure sensor, and the first correction value are calculated. and gas pressure determination means for calculating the gas supply pressure from the second correction value;
a shutoff valve that shuts off the flow path;
a control circuit that controls the flow rate measuring unit and shuts off the flow path with the shutoff valve when the flow rate measured by the flow rate measuring unit or the gas supply pressure calculated by the gas pressure determination means is determined to be abnormal;
Gas safety device with. ガスを流すための配管と、
前記配管上に設置され、ガス供給圧と大気圧の絶対圧力の真値を測定可能な圧力計測装置と、
前記配管上に設置された請求項４に記載のガス保安装置と、
からなり、前記ガス絶対圧力真値取得手段と前記大気絶対圧力真値取得手段は、前記圧力計測装置から前記ガス供給圧の絶対圧力の真値と前記大気の絶対圧力の真値を取得するガス保安システム。 piping for the flow of gas;
a pressure measuring device installed on the pipe and capable of measuring true values of gas supply pressure and atmospheric pressure;
The gas safety device according to claim 4 installed on the pipe;
wherein the gas absolute pressure true value acquisition means and the atmospheric absolute pressure true value acquisition means acquire the true value of the absolute pressure of the gas supply pressure and the true value of the absolute pressure of the atmosphere from the pressure measuring device security system. ガスを流すための配管と、
前記配管上に設置され、ガス供給圧と大気圧の絶対圧力の測定可能な第２のガス保安装置と、
前記配管上に設置された請求項４に記載のガス保安装置と、
からなり、前記ガス絶対圧力真値取得手段と前記大気絶対圧力真値取得手段は、前記第２のガス保安装置から前記ガス供給圧の絶対圧力の真値と前記大気の絶対圧力の真値を取得するガス保安システム。 piping for the flow of gas;
a second gas safety device installed on the pipe and capable of measuring the absolute pressure of the gas supply pressure and the atmospheric pressure;
The gas safety device according to claim 4 installed on the pipe;
wherein the gas absolute pressure true value acquiring means and the atmospheric absolute pressure true value acquiring means acquire the true absolute pressure value of the gas supply pressure and the true absolute pressure value of the atmosphere from the second gas safety device. gas security system to acquire.
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