JP2015224997A - Pressure gauge inspection system and pressure gauge inspection method used therefor - Google Patents
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Abstract
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本発明は、圧力計を検査するための検査システムと当該検査システムを利用した圧力計の検査方法に関する。 The present invention relates to an inspection system for inspecting a pressure gauge and a pressure gauge inspection method using the inspection system.
ガス配管等の気密漏洩試験を行う自記圧力計は、定期的に計測精度を検査・校正することが義務付けられている。しかも、自記圧力計が計測する気圧は、温度変化の影響を受け易く、例えば、０．０２８℃の温度変化であっても圧力値で０．０１ｋＰａの圧力変動となり、これは、自記圧力計に求められる最小誤差精度に近い圧力値である。したがって、自記圧力計の検査・校正の際には、自記圧力計が設置された環境の温度を厳密に管理することが必要となる。 Self-recording pressure gauges that perform airtight leak tests on gas piping, etc., are required to periodically inspect and calibrate the measurement accuracy. Moreover, the atmospheric pressure measured by the self-recording pressure gauge is easily affected by temperature changes. For example, even a temperature change of 0.028 ° C. results in a pressure fluctuation of 0.01 kPa as a pressure value. The pressure value is close to the required minimum error accuracy. Therefore, when inspecting and calibrating the self-recording pressure gauge, it is necessary to strictly control the temperature of the environment where the self-recording pressure gauge is installed.
自記圧力計を検査する際に温度変化を与える要因として、（１）自記圧力計が検査時に設置されている環境状態、（２）自記圧力計と操作者との接触、（３）自記圧力計に圧力負荷を与えるシステムなどが主な要因として挙げられる。 Factors that cause a temperature change when inspecting the self-recording pressure gauge are: (1) the environmental condition in which the self-recording pressure gauge is installed at the time of inspection, (2) contact between the self-recording pressure gauge and the operator, (3) self-recording pressure gauge The main factor is the system that applies pressure load to the surface.
自記圧力計が検査時に設置されている環境状態については、上述のような僅かな温度変化も精度に大きな影響を与えることから、恒温槽などの一定温度に保持できる環境に自記圧力計を配置する。しかしながら、恒温槽であっても、恒温槽内の空気の温度制御により、恒温槽内の温度を安定化させる場合には、恒温槽内部に送風（空気の流れ）が発生し、例えば、０．０２８℃以下の温度の変動幅に内部の温度制御を行うことは困難である。 Regarding the environmental condition where the self-recording pressure gauge is installed at the time of inspection, the slight temperature change as described above has a large effect on the accuracy, so the self-recording pressure gauge is placed in an environment that can be maintained at a constant temperature such as a thermostatic bath. . However, even in a thermostatic bath, when the temperature in the thermostatic bath is stabilized by controlling the temperature of the air in the thermostatic bath, air (flow of air) is generated inside the thermostatic bath. It is difficult to control the internal temperature within a temperature fluctuation range of 028 ° C. or less.
自記圧力計と操作者との接触については、例えば、室温条件（約２３℃）に自記圧力計を設置した場合、約３６℃の体温を有する操作者が該自記圧力計に接触すると、大幅な温度変化を自記圧力計に与えることとなる。 Regarding the contact between the self-recording pressure gauge and the operator, for example, when the self-recording pressure gauge is installed at room temperature (about 23 ° C.), when an operator having a body temperature of about 36 ° C. contacts the self-recording pressure gauge, The temperature change will be given to the self-recording pressure gauge.
自記圧力計に圧力負荷を与えるシステムについては、自記圧力計に規定圧力を加えるバルブ操作を行った際には、急激な圧力変動により断熱圧縮・断熱膨張が発生し、バルブ開閉の前後の配管内の空気の温度が変化し、配管やバルブ自体の温度が変動する。 For a system that applies pressure load to the self-recording pressure gauge, when a valve operation is performed to apply the specified pressure to the self-recording pressure gauge, adiabatic compression and adiabatic expansion occur due to sudden pressure fluctuations. The temperature of the air changes, and the temperature of the piping and the valve itself fluctuates.
他方、自記圧力計を定期的に検査・校正するには、上述のような温度変化を避ける環境を用意し、圧力検査用の基準器を用いて、自記圧力計の計測値が基準器の計測値と一致するように校正される。自記圧力計は、圧力検出手段と、該圧力検出手段から出力される検出信号の出力レベルを圧力値に変換する圧力値変換手段とを備えている。校正作業は、圧力値変換手段における該出力レベルと該圧力値との対応関係を調整する作業となる。 On the other hand, in order to periodically inspect and calibrate the self-recording pressure gauge, prepare an environment that avoids temperature changes as described above, and use the reference device for pressure inspection, and the measured value of the self-recording pressure gauge is measured by the reference device. Calibrated to match the value. The self-recording pressure gauge includes pressure detection means and pressure value conversion means for converting the output level of the detection signal output from the pressure detection means into a pressure value. The calibration operation is an operation for adjusting the correspondence between the output level and the pressure value in the pressure value conversion means.
温度を厳密に管理できる環境や圧力検査用基準器を用意するにはコストが掛る上、検査・校正作業の客観性や信頼性を担保するには、第三者の検査機関に自記圧力計の検査・校正を依頼することとなり、検査・校正に係る費用も膨大なものとなる。特に、多くの自記圧力計を使用する業者においては、その負担は深刻な問題となっている。 It is costly to prepare an environment that can strictly control the temperature and a standard for pressure inspection, and in order to ensure the objectivity and reliability of inspection and calibration work, a self-recording pressure gauge must be installed in a third-party inspection organization. The inspection and calibration will be requested, and the cost related to the inspection and calibration will be enormous. In particular, the burden is a serious problem in the traders who use many self-recording pressure gauges.
上述した自記圧力計に係る問題点は、自記圧力計に限らず、０．０１ｋＰａ程度以下の精度で、検査・校正作業が必要な圧力計にも、同様に該当する。また、配管内の圧力を直接検出するものに限らず、特許文献１に示すような差圧計測装置（エアリークテスタ）に使用される圧力計についても、検査・校正作業を行う場合には、同様の問題が発生する。 The problems related to the above-mentioned self-recording pressure gauge are not limited to the self-recording pressure gauge but also apply to pressure gauges that require inspection and calibration work with an accuracy of about 0.01 kPa or less. The pressure gauge used in the differential pressure measuring device (air leak tester) as shown in Patent Document 1 is not limited to directly detecting the pressure in the pipe. Problems occur.
本発明が解決しようとする課題は、上述した従来の問題を解消し、圧力計の検査・校正作業を低コストかつ簡便、更には精確に行うことを可能にする圧力計の検査システム及びそれに用いた圧力計の検査方法を提供することである。 The problem to be solved by the present invention is to solve the above-mentioned conventional problems, and to provide a pressure gauge inspection system and a pressure gauge inspection / calibration system which can perform inspection / calibration work of the pressure gauge at low cost, simply and accurately. It is to provide a pressure gauge inspection method.
上記課題を達成するために、本発明の圧力計の検査システム及びそれに用いた圧力計の検査方法は、以下のような技術的特徴を備えている。
（１） 圧力検出手段と、該圧力検出手段から出力される検出信号の出力レベルを圧力値に変換する圧力値変換手段とを備えた圧力計に対し、該圧力値変換手段を校正する圧力計の検査システムにおいて、該圧力計と無線又は有線で接続され、該圧力計の該圧力値が受信可能であり、かつ、該圧力値変換手段を制御可能な操作端末と、該圧力計を収納可能であり、収納した該圧力計に接続され該圧力計に圧力を加えるための配管を備えた恒温箱と、該恒温箱の外側には該配管に接続され加圧又は減圧が可能なバルブ手段を備えたことを特徴とする。
In order to achieve the above object, a pressure gauge inspection system and a pressure gauge inspection method used therefor have the following technical features.
(1) A pressure gauge for calibrating the pressure value conversion means with respect to a pressure gauge comprising pressure detection means and a pressure value conversion means for converting the output level of the detection signal output from the pressure detection means into a pressure value In this inspection system, the pressure gauge is connected to the pressure gauge wirelessly or by wire, can receive the pressure value of the pressure gauge, and can control the pressure value conversion means, and the pressure gauge can be stored And a thermostat box connected to the housed pressure gauge and provided with a pipe for applying pressure to the pressure gauge, and a valve means connected to the pipe and capable of being pressurized or depressurized outside the thermostat box. It is characterized by having.
（２） 上記（１）に記載の圧力計の検査システムを用いた圧力計の検査方法において、該恒温箱内に圧力計を収納して、該配管を該圧力計に接続する圧力計設置工程と、該バルブ手段を操作し、該圧力計に大気圧又は所定の圧力を印加する圧力負荷工程と、該バルブ手段を閉状態にし、該恒温箱の外部に配置された該操作端末で、該圧力値の変化を記録する圧力変化記録工程を有することを特徴とする。 (2) In the pressure gauge inspection method using the pressure gauge inspection system according to (1) above, a pressure gauge installation step of housing the pressure gauge in the constant temperature box and connecting the pipe to the pressure gauge A pressure load step of operating the valve means to apply atmospheric pressure or a predetermined pressure to the pressure gauge, and closing the valve means and operating the terminal disposed outside the thermostat box, It has a pressure change recording process which records the change of a pressure value.
（３） 上記（２）に記載の圧力計の検査方法において、該圧力計設置工程では、該恒温箱内に、少なくとも第１の圧力計と第２の圧力計とを、連通した該配管で接続し、該圧力負荷工程では、全ての圧力計に同じ圧力を印加し、該圧力変化記録工程では、各圧力計に対応した操作端末又は単一の操作端末に、各圧力計の該圧力値の変化を記録することを特徴とする。 (3) In the pressure gauge inspection method according to (2) above, in the pressure gauge installation step, at least the first pressure gauge and the second pressure gauge are connected to the thermostat box with the pipe connected to each other. In the pressure loading process, the same pressure is applied to all the pressure gauges. In the pressure change recording process, the pressure value of each pressure gauge is connected to an operation terminal corresponding to each pressure gauge or a single operation terminal. It is characterized by recording the change of.
（４） 上記（３）に記載の圧力計の検査方法において、該第１の圧力計に対応する操作端末が受信した該圧力値に基づき、該第２の圧力計に対応する操作端末を利用し、該第２の圧力計内の該圧力値変化手段を制御し校正する校正工程を有することを特徴とする。 (4) In the pressure gauge inspection method according to (3), the operation terminal corresponding to the second pressure gauge is used based on the pressure value received by the operation terminal corresponding to the first pressure gauge. And a calibration step of controlling and calibrating the pressure value changing means in the second pressure gauge.
（５） 上記（４）に記載の圧力計の検査方法において、各圧力計に対応する操作端末が一つの操作端末であることを特徴とする。 (5) In the pressure gauge inspection method according to (4), the operation terminal corresponding to each pressure gauge is a single operation terminal.
（６） 上記（２）乃至（４）のいずれかに記載の圧力計の検査方法において、該圧力計設置工程と該圧力負荷工程との間で、該バルブ手段を操作し、該圧力計に大気圧又は所定の圧力を印加し、その後、該バルブ手段を閉状態にし、該恒温箱の外部に配置された該操作端末で、該圧力値の変化を測定し、所定時間内に該圧力値が所定範囲を超えて変化した場合には、次の該圧力負荷工程には進まないことを特徴とする。 (6) In the pressure gauge inspection method according to any one of (2) to (4), the valve means is operated between the pressure gauge installation step and the pressure load step to After applying atmospheric pressure or a predetermined pressure, the valve means is closed, the change in the pressure value is measured at the operation terminal arranged outside the thermostatic box, and the pressure value is measured within a predetermined time. When the pressure changes beyond a predetermined range, the process does not proceed to the next pressure loading step.
（７） 上記（２）乃至（４）のいずれかに記載の圧力計の検査方法において、該圧力計設置工程と該圧力負荷工程との間で、該バルブ手段を操作し、該圧力計に大気圧又は所定の圧力を印加し、その後、該バルブ手段を閉状態にし、該恒温箱の外部に配置された該操作端末で、該圧力値の変化を測定し、所定時間に該圧力値が変化した変化量を基に、該圧力変化記録工程における該圧力値の変化を補正することを特徴とする。 (7) In the pressure gauge inspection method according to any one of (2) to (4), the valve means is operated between the pressure gauge installation step and the pressure load step to After applying atmospheric pressure or a predetermined pressure, the valve means is closed, the change in the pressure value is measured at the operation terminal arranged outside the thermostatic box, and the pressure value is A change in the pressure value in the pressure change recording step is corrected based on the changed amount of change.
本発明では、圧力検出手段と、該圧力検出手段から出力される検出信号の出力レベルを圧力値に変換する圧力値変換手段とを備えた圧力計に対し、該圧力値変換手段を校正する圧力計の検査システムにおいて、該圧力計と無線又は有線で接続され、該圧力計の該圧力値が受信可能であり、かつ、該圧力値変換手段を制御可能な操作端末と、該圧力計を収納可能であり、収納した該圧力計に接続され該圧力計に圧力を加えるための配管を備えた恒温箱と、該恒温箱の外側には該配管に接続され加圧又は減圧が可能なバルブ手段を備えているため、圧力計自体の温度変化に影響を及ぼす要因である、（１）圧力計が検査時に設置されている環境状態、（２）圧力計と操作者との接触、（３）圧力計に圧力負荷を与えるシステムなどからの影響を極力抑制することが可能となり、温度変化を抑えた検査環境を提供することが可能となる。 In the present invention, a pressure for calibrating the pressure value conversion means with respect to a pressure gauge comprising pressure detection means and a pressure value conversion means for converting an output level of a detection signal output from the pressure detection means into a pressure value. In a meter inspection system, an operation terminal that is connected to the pressure gauge wirelessly or by wire, can receive the pressure value of the pressure gauge, and can control the pressure value conversion means, and houses the pressure gauge A constant temperature box that is connected to the housed pressure gauge and has a pipe for applying pressure to the pressure gauge, and a valve means that is connected to the pipe outside the constant temperature box and can be pressurized or depressurized (1) Environmental conditions where the pressure gauge is installed at the time of inspection, (2) Contact between the pressure gauge and the operator, (3) Extremely affected by systems that apply pressure load to the pressure gauge It is possible to suppress, it is possible to provide a test environment with reduced temperature change.
そして、本発明の圧力計の検査システムを用いた圧力計の検査方法において、恒温箱内に圧力計を収納して、配管を該圧力計に接続する圧力計設置工程と、バルブ手段を操作し、該圧力計に大気圧又は所定の圧力を印加する圧力負荷工程と、該バルブ手段を閉状態にし、該恒温箱の外部に配置された操作端末で、圧力値の変化を記録する圧力変化記録工程を有するため、圧力計の温度変化を抑えた検査を実施することが可能となる。 Then, in the pressure gauge inspection method using the pressure gauge inspection system of the present invention, the pressure gauge is housed in a constant temperature box, and the pressure gauge installation step for connecting the pipe to the pressure gauge and the valve means are operated. , A pressure load process for applying atmospheric pressure or a predetermined pressure to the pressure gauge, and a pressure change record for recording a change in pressure value at an operation terminal placed outside the thermostatic box with the valve means closed Since it has a process, it becomes possible to carry out an inspection while suppressing a temperature change of the pressure gauge.
また、本発明の圧力計の検査方法では、圧力計設置工程と圧力負荷工程との間で、該バルブ手段を操作し、該圧力計に大気圧又は所定の圧力を印加し、その後、該バルブ手段を閉状態にし、該恒温箱の外部に配置された該操作端末で、該圧力値の変化を測定し、所定時間内に該圧力値が所定範囲を超えて変化した場合には、次の該圧力負荷工程には進まないように設定したり、所定時間に該圧力値が変化した変化量を基に、圧力変化記録工程における該圧力値の変化を補正することにより、より精確な圧力計の検査・校正が可能となる。 Further, in the pressure gauge inspection method of the present invention, the valve means is operated between the pressure gauge installation process and the pressure load process to apply atmospheric pressure or a predetermined pressure to the pressure gauge, and then the valve When the means is closed and the change of the pressure value is measured with the operation terminal arranged outside the thermostatic box, and the pressure value changes beyond a predetermined range within a predetermined time, A more accurate pressure gauge can be set by setting so as not to proceed to the pressure loading process, or by correcting the change in the pressure value in the pressure change recording process based on the amount of change in the pressure value during a predetermined time. Can be inspected and calibrated.
以下、本発明の圧力計の検査システム及びそれに用いた圧力計の検査方法について、詳細に説明する。
本発明に用いられる圧力計について、図１にその概略を示す。圧力計は、例えば、電気式ダイヤフラム式自記圧力計や差圧計測装置（エアリークテスタ）に使用される圧力計である。測定圧力の範囲や最小目盛単位は、自記圧力計で検査する対象に応じて種々のものを用意することが可能である。例えば、都市ガスやプロパンガスを供給する配管の気密試験を行う自記圧力計では、最低圧力が２．０ｋＰａ以上、最高圧力が８．４ｋＰａ以上１０ｋＰａ以下の範囲内の圧力を測定するよう設定されており、最小目盛単位は０．０２ｋＰａ以下である。
Hereinafter, a pressure gauge inspection system and a pressure gauge inspection method used therein will be described in detail.
About the pressure gauge used for this invention, the outline is shown in FIG. The pressure gauge is, for example, a pressure gauge used in an electric diaphragm type self-recording pressure gauge or a differential pressure measuring device (air leak tester). Various measurement pressure ranges and minimum scale units can be prepared depending on the object to be inspected by the self-recording pressure gauge. For example, in a self-recording pressure gauge that performs a gas tightness test on a pipe supplying city gas or propane gas, the pressure is set to measure a pressure within a range of a minimum pressure of 2.0 kPa or more and a maximum pressure of 8.4 kPa to 10 kPa. The minimum scale unit is 0.02 kPa or less.
圧力計には、図１に示すように、ダイヤフラム式の圧力センサーなどの圧力検出手段と、該圧力検出手段から出力される検出信号の出力レベルを圧力値に変換する圧力値変換手段とを備えている。圧力値変換手段は、図１の制御手段と対応テーブルから構成される。圧力値に変換する仕組みとしては、圧力検出手段からの検出信号を制御手段が受け、該制御手段において、検出信号の出力レベルと圧力値とを対応させる対応テーブルを参照しながら、受け取った検出信号の出力レベルに対応する圧力値を決定する。対応テーブルは、出力レベルと圧力値の詳細な対応表であったり、２つ以上の特定の出力レベルに対応する圧力値が記録されているものであっても良い。制御手段は、出力レベルに対応する圧力値が対応テーブルにある場合は、その値を呼び出し、該当する出力レベルが無い場合には、対応テーブルに記録されている複数の値から、不足する値を線形又は非線形で補完し、算出するようプログラムされている。 As shown in FIG. 1, the pressure gauge includes pressure detection means such as a diaphragm pressure sensor, and pressure value conversion means for converting the output level of the detection signal output from the pressure detection means into a pressure value. ing. The pressure value conversion means includes the control means and the correspondence table shown in FIG. As a mechanism for converting to a pressure value, the control means receives a detection signal from the pressure detection means, and the control means receives the detection signal while referring to a correspondence table that associates the output level of the detection signal with the pressure value. The pressure value corresponding to the output level is determined. The correspondence table may be a detailed correspondence table between output levels and pressure values, or may record pressure values corresponding to two or more specific output levels. When there is a pressure value corresponding to the output level in the correspondence table, the control means calls that value, and when there is no corresponding output level, the control means calculates a missing value from a plurality of values recorded in the correspondence table. It is programmed to complement and calculate linearly or non-linearly.
圧力計の校正は、この対応テーブルに記録されている数値を変更・修正することを意味する。また、圧力計には、表示部が設けられ、制御手段で決定した圧力値を表示可能に構成されている。さらに、圧力計は、圧力計の外部の操作端末と無線又は有線で接続され、入出力インターフェースＩ／Ｏを介して、情報交換が行われる。 Calibration of a pressure gauge means changing / correcting the numerical value recorded in this correspondence table. In addition, the pressure gauge is provided with a display unit so that the pressure value determined by the control means can be displayed. Further, the pressure gauge is connected to an operation terminal outside the pressure gauge by wireless or wired, and information is exchanged via the input / output interface I / O.
操作端末は、圧力計専用の端末であっても良いが、スマートフォンやタブレット型端末など、汎用的な携帯型情報端末であっても良い。少なくとも、操作端末では、圧力計からの圧力値に相当する信号を受信し、表示又は記録できる機能を備える必要がある。また、圧力計の電源のＯＮ・ＯＦＦや計測開始・終了などを指示するように、圧力計を遠隔操作するための機能を付加することが好ましい。さらに、校正に際しては、圧力計内の対応テーブルを変更・修正することを指示する機能を付加することが必要である。操作端末は、図２に示すように、１つの操作端末で１台の圧力計のみと通信できるように設定するだけでなく、図３に示すように、１つの操作端末で同時に複数の圧力計と交信できるよう設定しても良い。特に、特定の１台を校正の基準器とし、他の圧力計を検査対象器とする場合には、図３のように、単一の操作端末で操作できる方が、操作者にとっても作業負担が少なく、より好ましい。 The operation terminal may be a terminal dedicated to a pressure gauge, but may be a general-purpose portable information terminal such as a smartphone or a tablet terminal. At least, the operation terminal needs to have a function of receiving, displaying or recording a signal corresponding to the pressure value from the pressure gauge. In addition, it is preferable to add a function for remotely operating the pressure gauge so as to instruct ON / OFF of the power supply of the pressure gauge and start / end of measurement. Further, in calibration, it is necessary to add a function for instructing to change or modify the correspondence table in the pressure gauge. As shown in FIG. 2, the operation terminal is set not only to communicate with only one pressure gauge with one operation terminal, but also with a plurality of pressure gauges simultaneously with one operation terminal as shown in FIG. You may set to communicate with. In particular, when one specific unit is used as a calibration reference unit and another pressure gauge is used as a test target unit, it is more burdensome for the operator to operate with a single operation terminal as shown in FIG. Is less and more preferable.
本発明の圧力計の検査システムは、図２に示すように、圧力検出手段と、該圧力検出手段から出力される検出信号の出力レベルを圧力値に変換する圧力値変換手段とを備えた圧力計に対し、該圧力値変換手段を校正する圧力計の検査システムにおいて、該圧力計と無線又は有線で接続され、該圧力計の該圧力値が受信可能であり、かつ、該圧力値変換手段を制御可能な操作端末と、該圧力計を収納可能であり、収納した該圧力計に接続され該圧力計に圧力を加えるための配管を備えた恒温箱と、該恒温箱の外側には該配管に接続され加圧又は減圧が可能なバルブ手段を備えたことを特徴とする。 As shown in FIG. 2, the pressure gauge inspection system of the present invention includes a pressure detection means and a pressure value conversion means for converting an output level of a detection signal output from the pressure detection means into a pressure value. In a pressure gauge inspection system for calibrating the pressure value conversion means to a gauge, the pressure value is connected to the pressure gauge wirelessly or by wire, and the pressure value of the pressure gauge can be received, and the pressure value conversion means An operation terminal that can control the pressure gauge, a thermostatic box that is capable of storing the pressure gauge, is connected to the stored pressure gauge, and has a pipe for applying pressure to the pressure gauge; A valve means connected to the pipe and capable of pressurization or depressurization is provided.
本発明に用いる「恒温箱」とは、圧力計を収納する箱の内部と箱の外部とを、断熱材で遮断できる構成を備えたものであれば良い。ヒーターやクーラーなどの加熱・冷却手段や送風手段などを組み込むことも可能であるが、上述したように、僅かな温度変化を抑制することが必要であるため、断熱材で内部が温度的に外部から遮断された空間を形成できるような、単純な箱の方がより好ましい。 The “constant temperature box” used in the present invention only needs to have a structure capable of blocking the inside of the box housing the pressure gauge and the outside of the box with a heat insulating material. It is possible to incorporate heating / cooling means such as heaters and coolers, and air blowing means. However, as mentioned above, it is necessary to suppress slight temperature changes. A simple box that can form a shielded space is more preferable.
恒温箱内の配管に加圧又は減圧の負荷を与えるバルブ手段は、図２のように別途設けられた圧力源に接続されている。大気圧に調整可能にするには、図２のバルブ手段と圧力源との間に、大気中に解放された配管を接続し、その接続部分に配管の切り替え手段を設ける。 The valve means for applying a pressurizing or depressurizing load to the piping in the thermostatic box is connected to a pressure source provided separately as shown in FIG. In order to be able to adjust to atmospheric pressure, a pipe opened to the atmosphere is connected between the valve means and the pressure source in FIG. 2, and a pipe switching means is provided at the connection portion.
次に、本発明の圧力計の検査方法は、以下の手順で行う。
（１）恒温箱内に圧力計を収納して、配管を該圧力計に接続する（圧力計設置工程）
（２）バルブ手段を操作し、圧力計に大気圧又は所定の圧力を印加する（圧力負荷工程）
（３）バルブ手段を閉状態にし、恒温箱の外部に配置された操作端末で、圧力計が計測した圧力値を受信し、該圧力値の変化を記録する（圧力変化記録工程）
Next, the pressure gauge inspection method of the present invention is performed in the following procedure.
(1) A pressure gauge is housed in a thermostatic box, and piping is connected to the pressure gauge (pressure gauge installation process).
(2) Operate the valve means and apply atmospheric pressure or a predetermined pressure to the pressure gauge (pressure loading process)
(3) The valve means is closed, the pressure value measured by the pressure gauge is received at the operation terminal arranged outside the thermostatic box, and the change in the pressure value is recorded (pressure change recording step).
圧力計設置工程では、圧力計を操作者が長く触れると、操作者の体温により自記圧力計の温度が上昇するため、素早く設置すること必要である。また、恒温箱の扉を開放し、一定時間（数分間以上）放置し、圧力計や恒温箱の内部が常温（約２３℃）になるまで待機する。なお、後述するように、２つ以上の圧力計を用いて、比較検査（校正等）を行う場合には、圧力計毎に温度差があることが、最も問題であることから、全ての圧力計が同じ温度となるようにその取扱いについては、細心の注意を払う。 In the pressure gauge installation process, if the operator touches the pressure gauge for a long time, the temperature of the self-recording pressure gauge rises due to the body temperature of the operator, so it is necessary to install it quickly. Also, the door of the thermostatic box is opened, left for a certain time (several minutes or more), and waits until the inside of the pressure gauge or the thermostatic box reaches room temperature (about 23 ° C.). As will be described later, when a comparative inspection (calibration, etc.) is performed using two or more pressure gauges, there is a temperature difference between the pressure gauges. Pay close attention to its handling so that the temperature is the same.
圧力負荷工程に入る前に、圧力計に係る環境温度が変化していないか、環境判定を行うことが好ましい。圧力計に係る環境温度に影響を与える要因としては、圧力計自体の温度が周りの雰囲気の温度と異なる場合、配管の温度が周りの雰囲気の温度と異なる場合、配管内の気体の温度が変化しているあるいは配管の温度や周りの雰囲気と異なる場合、さらには、圧力計を取り巻く雰囲気の温度自体が変化している場合などがある。 Prior to entering the pressure loading process, it is preferable to determine whether the environmental temperature related to the pressure gauge has changed. Factors that affect the environmental temperature related to the pressure gauge are: the pressure gauge itself is different from the surrounding atmosphere, the piping temperature is different from the surrounding atmosphere, and the temperature of the gas in the piping changes. Or when the temperature of the piping is different from the surrounding atmosphere, or the temperature of the atmosphere surrounding the pressure gauge itself may be changing.
この環境判定方法は、特許文献２に示すように、恒温箱内の配管を一度、大気圧に解放し（あるいは所定圧力に設定しても良い）、その後、バルブ手段を閉じる。バルブ手段の操作による断熱圧縮・断熱膨張で過渡的変化し、その後温度変化が安定するのを待って、圧力計の圧力値の変化を記録する。当該圧力値が上昇している場合には、圧力計に係る環境温度が温度上昇している可能性が考えられ、当該圧力値が下降している場合には、その逆の現象が想定される。検査時間（全ての検査に掛る総時間）以上又は、校正などの比較検査の場合には、基準器の測定記録を終了してから検査対象器の測定記録を開始するまでの時間差（例えば２秒程度）に相当する時間以上、具体的は、例えば、３０秒の間に、所定の圧力変動（例えば、最小目盛単位の０．０２ｋＰａ以下、より好ましくは０．０１ｋＰａ以下）に収まっているか否かを判定し、収まっている場合には、環境判定を合格として、検査を開始する。 In this environment determination method, as shown in Patent Document 2, the piping in the thermostatic box is once released to atmospheric pressure (or may be set to a predetermined pressure), and then the valve means is closed. A change in pressure value of the pressure gauge is recorded after waiting for the temperature change to stabilize after a transient change due to adiabatic compression / adiabatic expansion caused by the operation of the valve means. If the pressure value is rising, there is a possibility that the environmental temperature related to the pressure gauge is rising, and if the pressure value is falling, the opposite phenomenon is assumed. . More than the inspection time (total time for all inspections) or in the case of comparative inspection such as calibration, the time difference (for example, 2 seconds) from the end of the measurement record of the reference device to the start of the measurement record of the inspection target device Whether or not it is within a predetermined pressure fluctuation (for example, 0.02 kPa or less, more preferably 0.01 kPa or less of the minimum scale unit) for 30 seconds or more, for example, for 30 seconds. If it is within the range, the environmental determination is accepted and the inspection is started.
本発明の圧力計の検査方法において、圧力計の校正などに利用できる比較検査方法について説明する。図２に示すように、圧力計設置工程では、恒温箱内に、少なくとも第１の圧力計（基準器）と第２の圧力計（検査対象器）とを、連通した配管で接続する。そして、圧力負荷工程では、全ての圧力計に同じ圧力を印加する。圧力変化記録工程では、各圧力計に対応した操作端末又は単一の操作端末に、各圧力計の該圧力値の変化を記録する。これにより、第１の圧力計の計測した圧力値と第２の圧力計で計測した圧力値とが同じ又は許容誤差範囲（例えば、０．０３ｋＰａ以内）であれば、第２の圧力計は適正であると評価でき、そうでない場合には不適正と評価できる。 In the pressure gauge inspection method of the present invention, a comparative inspection method that can be used for calibration of the pressure gauge will be described. As shown in FIG. 2, in the pressure gauge installation step, at least a first pressure gauge (reference device) and a second pressure gauge (inspection device) are connected to each other in a constant temperature box through a connected pipe. In the pressure loading step, the same pressure is applied to all pressure gauges. In the pressure change recording step, a change in the pressure value of each pressure gauge is recorded on an operation terminal corresponding to each pressure gauge or a single operation terminal. Accordingly, if the pressure value measured by the first pressure gauge and the pressure value measured by the second pressure gauge are the same or within an allowable error range (for example, within 0.03 kPa), the second pressure gauge is appropriate. If not, it can be evaluated as inappropriate.
第２の圧力計を自動で校正するには、第１の圧力計に対応する操作端末が受信した圧力値に基づき、第２の圧力計に対応する操作端末を利用し、第２の圧力計内の該圧力値変化手段を制御し校正する校正工程を、さらに付加することが必要である。圧力値変化手段は、上述したように図１の制御手段と対応テーブルから構成され、校正工程においては、対応テーブルに記録された圧力検出手段の出力レベルと圧力値との対応表の数値が、第１の圧力計の測定値に基づき変更・修正される。 To automatically calibrate the second pressure gauge, based on the pressure value received by the operation terminal corresponding to the first pressure gauge, the operation terminal corresponding to the second pressure gauge is used, and the second pressure gauge It is necessary to further add a calibration process for controlling and calibrating the pressure value changing means. The pressure value changing means is composed of the control means and the correspondence table of FIG. 1 as described above, and in the calibration step, the numerical value of the correspondence table between the output level of the pressure detection means and the pressure value recorded in the correspondence table is It is changed or corrected based on the measured value of the first pressure gauge.
さらに、上記比較検査において、各圧力計に対応する操作端末が一つの操作端末である場合には、操作端末間のデータの交換作業が不要となり、極めて簡便に比較検査（校正）作業を行うことが可能となる。 Furthermore, in the above comparative inspection, when the operation terminal corresponding to each pressure gauge is a single operation terminal, the data exchange work between the operation terminals is not required, and the comparative inspection (calibration) work can be performed very simply. Is possible.
本発明の検査方法、特に、比較検査方法を利用することで、圧力計をより安価かつ簡便に校正することができる。つまり、圧力計を保有する事業者は、社内に本発明の検査システムを備え、第三者の検査機関に基準器となる圧力計の校正を依頼する。図２のように、校正済みの圧力計（基準器）を恒温箱に入れ、検査対象器を入れて、本発明の検査方法を実施するだけで、検査対象器の校正を容易に実施することができる。しかも、恒温箱も単純な構成のもので良いため、検査システムに係るコストも低く抑えることが可能である。 By using the inspection method of the present invention, particularly the comparative inspection method, the pressure gauge can be calibrated more inexpensively and easily. In other words, the business operator who owns the pressure gauge is provided with the inspection system of the present invention in the company, and requests a third party inspection organization to calibrate the pressure gauge as a reference device. As shown in FIG. 2, the calibration of the inspection target device is easily performed simply by putting the calibrated pressure gauge (reference device) into the thermostatic box, inserting the inspection target device, and carrying out the inspection method of the present invention. Can do. In addition, since the thermostatic box may have a simple configuration, the cost associated with the inspection system can be kept low.
以上説明したように、本発明によれば、圧力計の校正作業を低コストかつ簡便、更には精確に行うことを可能にする圧力計の検査システム及びそれに用いた圧力計の検査方法を提供することが可能になる。 As described above, according to the present invention, there are provided a pressure gauge inspection system and a pressure gauge inspection method used for the pressure gauge that enable low-cost, simple, and accurate calibration of the pressure gauge. It becomes possible.
Claims (7)
該圧力計と無線又は有線で接続され、該圧力計の該圧力値が受信可能であり、かつ、該圧力値変換手段を制御可能な操作端末と、
該圧力計を収納可能であり、収納した該圧力計に接続され該圧力計に圧力を加えるための配管を備えた恒温箱と、
該恒温箱の外側には該配管に接続され加圧又は減圧が可能なバルブ手段を備えたことを特徴とする圧力計の検査システム。 Pressure gauge inspection system for calibrating pressure value conversion means for pressure gauge comprising pressure detection means and pressure value conversion means for converting an output level of a detection signal output from the pressure detection means into a pressure value In
An operation terminal connected to the pressure gauge wirelessly or by wire, capable of receiving the pressure value of the pressure gauge, and capable of controlling the pressure value conversion means;
A thermostatic chamber that can store the pressure gauge, and is connected to the stored pressure gauge and includes a pipe for applying pressure to the pressure gauge;
A pressure gauge inspection system comprising valve means connected to the pipe and capable of being pressurized or depressurized outside the thermostatic box.
該恒温箱内に圧力計を収納して、該配管を該圧力計に接続する圧力計設置工程と、
該バルブ手段を操作し、該圧力計に大気圧又は所定の圧力を印加する圧力負荷工程と、
該バルブ手段を閉状態にし、該恒温箱の外部に配置された該操作端末で、該圧力値の変化を記録する圧力変化記録工程を有することを特徴とする圧力計の検査方法。 In the pressure gauge inspection method using the pressure gauge inspection system according to claim 1,
A pressure gauge is housed in the thermostatic box, and a pressure gauge installation step of connecting the pipe to the pressure gauge;
A pressure loading step of operating the valve means to apply atmospheric pressure or a predetermined pressure to the pressure gauge;
A pressure gauge inspection method comprising: a pressure change recording step of recording a change in the pressure value at the operation terminal disposed outside the thermostatic box with the valve means closed.
該圧力計設置工程では、該恒温箱内に、少なくとも第１の圧力計と第２の圧力計とを、連通した該配管で接続し、
該圧力負荷工程では、全ての圧力計に同じ圧力を印加し、
該圧力変化記録工程では、各圧力計に対応した操作端末又は単一の操作端末に、各圧力計の該圧力値の変化を記録することを特徴とする圧力計の検査方法。 The pressure gauge inspection method according to claim 2,
In the pressure gauge installation step, at least the first pressure gauge and the second pressure gauge are connected to the thermostat box through the pipes in communication,
In the pressure loading step, the same pressure is applied to all pressure gauges,
In the pressure change recording step, a change in the pressure value of each pressure gauge is recorded on an operation terminal corresponding to each pressure gauge or a single operation terminal.
該第１の圧力計に対応する操作端末が受信した該圧力値に基づき、該第２の圧力計に対応する操作端末を利用し、該第２の圧力計内の該圧力値変化手段を制御し校正する校正工程を有することを特徴とする圧力計の検査方法。 The pressure gauge inspection method according to claim 3,
Based on the pressure value received by the operation terminal corresponding to the first pressure gauge, the operation terminal corresponding to the second pressure gauge is used to control the pressure value changing means in the second pressure gauge. A pressure gauge inspection method comprising a calibration step of performing calibration.
各圧力計に対応する操作端末が一つの操作端末であることを特徴とする圧力計の検査方法。 The pressure gauge inspection method according to claim 4,
A pressure gauge inspection method, wherein an operation terminal corresponding to each pressure gauge is one operation terminal.
5. The pressure gauge inspection method according to claim 2, wherein the valve means is operated between the pressure gauge installation step and the pressure load step so that the pressure gauge is at atmospheric pressure or a predetermined pressure. After that, the valve means is closed, the change in the pressure value is measured at the operation terminal arranged outside the thermostatic box, and the amount of change in the pressure value during a predetermined time is measured. And a pressure gauge inspection method for correcting a change in the pressure value in the pressure change recording step.
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|---|---|---|---|---|
| CN105823596A (en) * | 2016-04-15 | 2016-08-03 | 中国计量科学研究院 | Piston pressure gauge verification and calibration device and method |
| JP2020085485A (en) * | 2018-11-16 | 2020-06-04 | 東京ガスエンジニアリングソリューションズ株式会社 | Pressure gauge inspection method and pressure gauge inspection device |
| CN113063543A (en) * | 2021-03-15 | 2021-07-02 | 金仪计量科技(苏州)有限公司 | Pressure gauge calibration method and calibration system |
| CN115060414A (en) * | 2022-08-17 | 2022-09-16 | 成都凯天电子股份有限公司 | Device and method for providing high-precision pressure standard |
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| CN105823596A (en) * | 2016-04-15 | 2016-08-03 | 中国计量科学研究院 | Piston pressure gauge verification and calibration device and method |
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| CN113063543B (en) * | 2021-03-15 | 2022-12-20 | 金仪计量科技(苏州)有限公司 | Calibration method and calibration system for pressure gauge |
| CN115060414A (en) * | 2022-08-17 | 2022-09-16 | 成都凯天电子股份有限公司 | Device and method for providing high-precision pressure standard |
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