JPH05288584A - Flow rate measuring device - Google Patents
Flow rate measuring deviceInfo
- Publication number
- JPH05288584A JPH05288584A JP4091384A JP9138492A JPH05288584A JP H05288584 A JPH05288584 A JP H05288584A JP 4091384 A JP4091384 A JP 4091384A JP 9138492 A JP9138492 A JP 9138492A JP H05288584 A JPH05288584 A JP H05288584A
- Authority
- JP
- Japan
- Prior art keywords
- differential pressure
- pressure transmitter
- valve
- point correction
- zero point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
- Flow Control (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はオリフィスを有する配管
中を流れる流体の流量を測定する流量測定装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate measuring device for measuring the flow rate of a fluid flowing through a pipe having an orifice.
【０００２】[0002]
【従来の技術】差圧伝送器を用いた流量測定装置のなか
で、低流量域での零点誤差を除去する方法の１つとし
て、図２に示す流量測定装置が知られている（特公昭５
８−５７６８９号）。2. Description of the Related Art Among the flow rate measuring devices using a differential pressure transmitter, the flow rate measuring device shown in FIG. 2 is known as one of the methods for removing the zero point error in the low flow rate region (Japanese Patent Publication No. 5
8-57689).
【０００３】この図に示す流量測定装置はオリフィス１
０１を有する配管１０２の前記オリフィス１０１の上流
側に接続された検出配管１０３および下流側に接続され
た検出配管１０４を介して前記配管１０２内のオリフィ
ス上流側圧力および前記オリフィス下流側圧力を取り出
して各手動バルブ１０６、１０７および各ストップ弁１
０８、１０９を各々、介して差圧伝送器１１０に導い
て、これらの圧力差を検出する。The flow rate measuring device shown in this figure has an orifice 1
The orifice upstream side pressure and the orifice downstream side pressure in the pipe 102 are taken out through the detection pipe 103 connected to the upstream side of the orifice 101 and the detection pipe 104 connected to the downstream side of the pipe 102 having 01. Each manual valve 106, 107 and each stop valve 1
08 and 109 are led to the differential pressure transmitter 110 via each, and these pressure differences are detected.
【０００４】そして、この検出結果を伝送ライン１１１
を介して監視室側にあるスイッチ１１２に導くととも
に、このスイッチ１１２を介して前記圧力差を減算器１
１５に導いてホールド回路１１３に保持されているサン
プリング時の圧力差との差を演算させた後、開平演算器
１０６で開平演算させてこの演算結果（測定流量値）を
流量制御部１１７と、制御部１９とに供給する。Then, the detection result is transmitted to the transmission line 111.
Through the switch 112 on the monitoring room side, and the pressure difference is subtracted by the subtracter 1 via the switch 112.
15 and calculates the difference between the pressure difference at the time of sampling held in the hold circuit 113, and then the square root calculator 106 performs square root calculation and the calculation result (measured flow rate value) is supplied to the flow rate controller 117. It is supplied to the control unit 19.
【０００５】これにより、流量制御部１１７によって前
記開平演算器１１６から出力される測定流量値と、予め
設定されている流量目標値とを比較させてこれらを一致
させる制御信号を生成させてこれをホールド回路１１８
に供給して前記配管１０２に設けられている流量制御弁
１２０の弁開度を制御して前記配管１０２中を流れる流
体の流量を前記流量目標値に一致させる。As a result, the flow rate control unit 117 compares the measured flow rate value output from the square root calculator 116 with a preset flow rate target value, and generates a control signal for making them coincide with each other. Hold circuit 118
To control the valve opening of the flow rate control valve 120 provided in the pipe 102 to match the flow rate of the fluid flowing in the pipe 102 with the flow rate target value.
【０００６】また、予め設定されている周期で、制御部
１１９によって零点補正信号を生成して前記ホールド回
路１１８にホールド動作を行なわせるとともに、前記零
点補正信号を伝送ライン１２３を介して前記各ストップ
弁１０８、１０９と、これらの各ストップ弁１０８、１
０９の吐出側を連通させる均圧弁１２２とに供給してこ
れらの各ストップ弁１０８、１０９を閉状態にするとと
もに、前記均圧弁１２２を開状態にする。Further, at a preset cycle, a zero correction signal is generated by the control unit 119 to cause the hold circuit 118 to perform a hold operation, and the zero correction signal is transmitted through the transmission line 123 to each of the stops. Valves 108, 109 and their respective stop valves 108, 1
And the pressure equalizing valve 122 that communicates the discharge side of 09 with the respective stop valves 108 and 109 to be closed and the pressure equalizing valve 122 to be open.
【０００７】そして、この均圧弁１２２と、各ストップ
弁１０８、１０９の吐出側を連通させる手動弁１２１
（この手動弁１２１は通常の状態では開状態にされてい
る）１２とによって差圧伝送器１１０に供給される圧力
を均一にしながら、この差圧伝送器１１０から出力され
る圧力差信号を伝送ライン１１１を介してスイッチ１１
２に供給させてホールド回路１１３にホールドさせると
ともに、判定器１１４で前記圧力差が正常な値かどうか
を判定させて前記圧力差が異常なとき、保守要求信号を
生成させて係員等にこれを知らせる。Then, a pressure equalizing valve 122 and a manual valve 121 for connecting the discharge sides of the stop valves 108 and 109 to each other.
(This manual valve 121 is normally opened) 12 and the pressure difference signal output from the differential pressure transmitter 110 is transmitted while making the pressure supplied to the differential pressure transmitter 110 uniform. Switch 11 via line 111
2 and hold it in the hold circuit 113, and determiner 114 determines whether or not the pressure difference is a normal value. When the pressure difference is abnormal, a maintenance request signal is generated to notify a person in charge of this. Inform.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上述し
た従来の流量測定装置においては、アナログ電流出力を
出す差圧伝送器１１０に電磁弁等の遠隔操作し得るスト
ップ弁１０８、１０９や均圧弁１２２を取付け、監視室
側にある制御部１１９から零点補正信号を出力させてこ
れを特別に配線した伝送ライン１２３を介して前記各ス
トップ弁１０８、１０９や均圧弁１２２に供給して零点
補正を行なわせるようにしているので、前記伝送ライン
１２３を配線する分だけ、設置コストが高くなってしま
うとともに、監視室側での作業が煩雑になってしまうと
いう問題があった。However, in the above-described conventional flow rate measuring device, the differential pressure transmitter 110 that outputs an analog current is provided with the stop valves 108 and 109 and the pressure equalizing valve 122 that can be remotely operated, such as a solenoid valve. A zero point correction signal is output from a control unit 119 installed in the monitoring room and supplied to the stop valves 108 and 109 and the pressure equalizing valve 122 via a specially wired transmission line 123 to perform zero point correction. Therefore, there is a problem that the installation cost is increased due to the wiring of the transmission line 123 and the work in the monitoring room becomes complicated.
【０００９】本発明は上記の事情に鑑み、特別な伝送ラ
インを配線することなく、差圧伝送器の零点補正を行な
うことができるとともに、監視室側での処理を簡素化す
ることができる流量測定装置を提供することを目的とし
ている。In view of the above circumstances, the present invention is capable of performing zero-point correction of a differential pressure transmitter without wiring a special transmission line, and simplifies the processing on the monitoring room side. The purpose is to provide a measuring device.
【００１０】[0010]
【課題を解決するための手段】上記の目的を達成するた
めに本発明による流量測定装置は、流体が流通する配管
系に設けられたオリフィスの上流側と、下流側とに各
々、接続される検出配管と、これらの各検出配管によっ
て導かれた圧力の差を検出する差圧伝送器と、この差圧
伝送器によって検出された圧力差を上位制御装置に伝送
する伝送ラインと、前記各検出配管の途中に各々、設け
られる常開のストップ弁と、これらの各ストップ弁の吐
出側を連通させる連通配管に常閉の均圧弁と、前記伝送
ラインを介して零点補正信号が送られて前記差圧伝送器
から零点補正信号が出力されたとき、前記各ストップ弁
を閉じるとともに、前記均圧弁を開かせて前記差圧伝送
器に零点補正を行なわせるバルブ制御器とを備えたこと
を特徴としている。In order to achieve the above object, a flow rate measuring device according to the present invention is connected to an upstream side and a downstream side of an orifice provided in a piping system through which a fluid flows. Each of the detection pipes, a differential pressure transmitter that detects a pressure difference introduced by each of these detection pipes, a transmission line that transmits the pressure difference detected by the differential pressure transmitters to a host controller, and each of the detection lines A normally-open stop valve provided in the middle of each of the pipes, a normally-equalized pressure equalizing valve in a communication pipe that communicates the discharge side of each of these stop valves, and a zero-point correction signal sent via the transmission line. And a valve controller for closing the stop valves and opening the pressure equalizing valve to cause the differential pressure transmitter to perform zero point correction when a zero point correction signal is output from the differential pressure transmitter. I am trying.
【００１１】[0011]
【作用】上記の構成において、上位制御装置によって零
点補正指令が生成されてこれが伝送ラインを介して差圧
伝送器に供給され、この差圧伝送器のインテリジェント
機能によって検出配管の途中に設けられたバルブセット
のバルブ制御器に零点補正シーケンスを行なわせて各ス
トップ弁を閉じさせるとともに、均圧弁を開かせて前記
差圧伝送器に零点補正を行なわせる。In the above structure, a zero point correction command is generated by the host controller and is supplied to the differential pressure transmitter via the transmission line. The zero pressure correction command is provided in the middle of the detection pipe by the intelligent function of the differential pressure transmitter. The valve controller of the valve set is made to perform a zero correction sequence to close each stop valve, and the pressure equalizing valve is opened to make the differential pressure transmitter perform zero correction.
【００１２】[0012]
【実施例】図１は本発明による流量測定装置の一実施例
を示す構成図である。1 is a block diagram showing an embodiment of a flow rate measuring device according to the present invention.
【００１３】この図に示す流量測定装置は配管１と、２
本の検出配管２、３と、バルブセット４と、差圧伝送器
５と、伝送ライン６と、上位制御装置７とによって構成
されており、差圧伝送器５によって配管１中のオリフィ
ス８の上流側の圧力と、下流側の圧力との差を検出させ
てこれを伝送ライン６を介して上位制御装置７に供給す
る。そして、差圧伝送器５の零点補正を行なうとき、上
位制御装置７から零点補正信号を出力させてこれを伝送
ライン６を介して前記差圧伝送器５に供給して、この差
圧伝送器５にバルブセットを制御させて検出圧力を均一
にして零点校正を行なう。The flow rate measuring device shown in this figure has pipes 1 and 2
The detection pipes 2 and 3 of the book, the valve set 4, the differential pressure transmitter 5, the transmission line 6, and the host controller 7 are used to configure the orifice 8 in the pipe 1 by the differential pressure transmitter 5. The difference between the pressure on the upstream side and the pressure on the downstream side is detected, and this is supplied to the host controller 7 via the transmission line 6. When the zero point of the differential pressure transmitter 5 is corrected, a zero point correction signal is output from the host controller 7 and is supplied to the differential pressure transmitter 5 via the transmission line 6, and this differential pressure transmitter is transmitted. 5 controls the valve set to make the detected pressure uniform and perform zero point calibration.
【００１４】配管１はその一部にオリフィス８が設けら
れており、前記オリフィス８の上流側に一方の検出配管
２が接続されるとともに、前記オリフィス８の下流側に
他方の検出配管３が接続されている。An orifice 8 is provided in a part of the pipe 1, and one detection pipe 2 is connected to the upstream side of the orifice 8 and the other detection pipe 3 is connected to the downstream side of the orifice 8. Has been done.
【００１５】各検出配管２、３は各一端が前記配管１の
オリフィス上流側、下流側に各々、接続され、各他端が
バルブセット４に接続されており、前記配管１中を流れ
る流体のオリフィス上流側圧力と、下流側圧力とをバル
ブセット４を介して前記差圧伝送器５に導く。One end of each of the detection pipes 2 and 3 is connected to the upstream side and the downstream side of the orifice of the pipe 1, and the other end is connected to the valve set 4, and the fluid flowing in the pipe 1 is The pressure on the upstream side of the orifice and the pressure on the downstream side are guided to the differential pressure transmitter 5 via the valve set 4.
【００１６】バルブセット４は前記各検出配管２、３の
途中に各々、設けられるストップ弁１０、１１と、各検
出配管２、３の前記各ストップ弁１０、１１より前記差
圧伝送器５側に近い部分で、前記各検出配管２、３を連
通させる連通配管１２と、この連通配管１２の途中に設
けられる均圧弁１３と、この均圧弁１３および前記各ス
トップ弁１０、１１を制御するバルブ制御器１４と、こ
のバルブ制御器１４の入力端子と前記差圧伝送器５の接
点出力端子（ＤＯ）とを接続する接続線１５と、前記バ
ルブ制御器１４の出力端子と前記差圧伝送器５の接点入
力端子（ＤＩ）とを接続する接続線１６とによって構成
されており、前記差圧伝送器５の接点出力端子から零点
補正信号が出力されていないときには、バルブ制御器１
４によって均圧弁１３を閉じるとともに、各ストップ弁
１０、１１を開いて前記配管１中を流れる流体のオリフ
ィス上流側圧力と、下流側圧力とを前記差圧伝送器５に
導き、また前記差圧伝送器５の接点出力端子から零点補
正信号が出力されたときには、バルブ制御器１４によっ
て各ストップ弁１０、１１を閉じるとともに、均圧弁１
３を開いて前記差圧伝送器５に入力される圧力を均一に
するとともに、各ストップ弁１０、１１および均圧弁１
０３の状態を示すバルブ状態信号を生成してこれを差圧
伝送器５の接点入力端子に供給する。The valve set 4 is provided with stop valves 10 and 11 provided in the middle of the detection pipes 2 and 3, respectively, and from the stop valves 10 and 11 of the detection pipes 2 and 3 to the differential pressure transmitter 5 side. A communication pipe 12 for communicating the detection pipes 2 and 3 with each other, a pressure equalizing valve 13 provided in the middle of the communication pipe 12, and a valve for controlling the pressure equalizing valve 13 and the stop valves 10 and 11. The controller 14, a connecting line 15 connecting the input terminal of the valve controller 14 and the contact output terminal (DO) of the differential pressure transmitter 5, the output terminal of the valve controller 14 and the differential pressure transmitter. 5 is connected to the contact input terminal (DI) of the differential pressure transmitter 5, and when the zero point correction signal is not output from the contact output terminal of the differential pressure transmitter 5, the valve controller 1
4, the pressure equalizing valve 13 is closed, and the stop valves 10 and 11 are opened to guide the upstream pressure and the downstream pressure of the fluid flowing in the pipe 1 to the differential pressure transmitter 5, and the differential pressure transmitter 5. When a zero correction signal is output from the contact output terminal of the transmitter 5, the valve controller 14 closes each of the stop valves 10 and 11, and the pressure equalizing valve 1
3 is opened to make the pressure input to the differential pressure transmitter 5 uniform, and each stop valve 10, 11 and the pressure equalizing valve 1
A valve state signal indicating the state of 03 is generated and supplied to the contact input terminal of the differential pressure transmitter 5.
【００１７】差圧伝送器５は前記伝送ライン６を介して
測定指令が供給されたときには、前記各検出配管２、３
を介して導かれる各圧力の差を検出して圧力差信号を生
成し、これを４−２０ｍＡの伝送信号にして前記上位制
御装置７に供給し、また前記伝送ライン６を介して零点
補正指令が供給されたときには、直前に得られた圧力差
信号をホールドするとともに、前記接点出力端子から零
点補正信号を出力させてバルブ制御器１４に零点制御処
理を行なわせるとともに、接点入力端子によって前記バ
ルブ制御器１４から出力されるバルブ状態信号を取り込
んでデジタル信号（零点補正終了信号）を生成し、これ
を前記伝送ライン６を介して前記上位制御装置７に供給
する。When a measurement command is supplied through the transmission line 6, the differential pressure transmitter 5 receives each of the detection pipes 2, 3 described above.
The pressure difference signal generated by detecting each pressure difference is supplied to the host controller 7 as a transmission signal of 4-20 mA, and a zero point correction command is transmitted via the transmission line 6. Is supplied, the pressure difference signal obtained immediately before is held, and a zero point correction signal is output from the contact output terminal to cause the valve controller 14 to perform a zero point control process. The valve state signal output from the controller 14 is taken in to generate a digital signal (zero point correction end signal), which is supplied to the host controller 7 via the transmission line 6.
【００１８】上位制御装置７は監視室側に設置されてお
り、測定指令を生成してこれを前記伝送ライン６を介し
て前記差圧伝送器５に供給した後、前記伝送ライン６を
介して伝送信号を取り込んで前記差圧伝送器５で測定さ
れた圧力差信号を再生するとともに、この圧力差信号に
基づいて前記配管１中を流れる流体の流量を演算する。
そして、予め設定されている周期で零点補正指令を生成
してこれを前記伝送ライン６を介して前記差圧伝送器５
に供給して零点補正動作を行なわせる。The host controller 7 is installed on the monitoring room side, generates a measurement command and supplies it to the differential pressure transmitter 5 via the transmission line 6, and then via the transmission line 6. The transmission signal is taken in to reproduce the pressure difference signal measured by the differential pressure transmitter 5, and the flow rate of the fluid flowing through the pipe 1 is calculated based on the pressure difference signal.
Then, a zero point correction command is generated at a preset cycle, and the zero point correction command is generated through the transmission line 6 to the differential pressure transmitter 5
To perform a zero correction operation.
【００１９】次に、図１に示す構成図を参照しながら、
この実施例の零点補正動作を説明する。Next, referring to the block diagram shown in FIG.
The zero correction operation of this embodiment will be described.
【００２０】まず、予め設定されている零点補正のタイ
ミングになれば、上位制御装置７は零点補正指令を生成
してこれを伝送ライン６上に送出して差圧伝送器５に送
る。First, when the preset zero-point correction timing is reached, the host controller 7 generates a zero-point correction command, sends it to the transmission line 6, and sends it to the differential pressure transmitter 5.
【００２１】これによって、差圧伝送器５は内部メモリ
に格納されている零点シーケンスプログラムに基づいて
直前の測定動作によって得られた圧力差信号を保持す
る。As a result, the differential pressure transmitter 5 holds the pressure difference signal obtained by the immediately preceding measuring operation based on the zero point sequence program stored in the internal memory.
【００２２】この後、差圧伝送器５は零点補正信号を生
成し、これを接点出力端子から出力してバルブセット４
のバルブ制御器１４に供給して、検出配管２、３の途中
に設けられた各ストップ弁１０、１１を閉じさせるとと
もに、均圧配管１２の途中に設けられた均圧弁１３を開
かせる。After that, the differential pressure transmitter 5 generates a zero-point correction signal and outputs it from the contact output terminal to output it to the valve set 4.
To stop the stop valves 10 and 11 provided in the middle of the detection pipes 2 and 3 and open the pressure equalizing valve 13 provided in the middle of the pressure equalizing pipe 12.
【００２３】次いで、前記バルブ制御器１４からバルブ
状態信号が出力されれば、差圧伝送器５は接点入力端子
を介して前記バルブ状態信号を取り込んで各ストップ弁
１０、１１および均圧弁１３の状態が零点補正状態にな
ったと判定して、各検出配管２、３によって導かれる圧
力の差に基づいて零点補正を行なってこのときの圧力差
信号が零になるように内部回路を調整する。Next, when a valve status signal is output from the valve controller 14, the differential pressure transmitter 5 takes in the valve status signal via a contact input terminal and outputs the valve status signal to each of the stop valves 10 and 11 and the pressure equalizing valve 13. When it is determined that the state has reached the zero point correction state, the zero point correction is performed based on the pressure difference introduced by the detection pipes 2 and 3, and the internal circuit is adjusted so that the pressure difference signal at this time becomes zero.
【００２４】そして、この調整が終了すれば、差圧伝送
器５は測定開始信号を生成して接点出力端子からこれを
出力してバルブ制御器１４を動作させ、均圧弁１３を閉
じさせるとともに、各ストップ弁１０、１１を開かせて
配管１のオリフィス上流側圧力と、オリフィス下流側圧
力とを自差圧伝送器５に導かせた後、零点補正が終了し
たことを示す零点補正終了信号を生成し、これをデジタ
ル信号にして伝送ライン６上に送出して上位制御装置７
に供給する。When this adjustment is completed, the differential pressure transmitter 5 generates a measurement start signal and outputs it from the contact output terminal to operate the valve controller 14 to close the pressure equalizing valve 13 and After the stop valves 10 and 11 are opened to guide the orifice upstream side pressure and the orifice downstream side pressure of the pipe 1 to the differential pressure transmitter 5, a zero point correction end signal indicating that the zero point correction is finished is sent. The high-order control device 7
Supply to.
【００２５】この後、差圧伝送器５は一定に保持してい
た圧力差信号を解除して通常の測定状態に戻る。After this, the differential pressure transmitter 5 releases the pressure difference signal that was held constant and returns to the normal measurement state.
【００２６】このようにこの実施例においては、上位制
御装置７によって零点補正指令を生成してこれを伝送ラ
イン６を介して差圧伝送器５に供給し、この差圧伝送器
５のインテリジェント機能を利用して検出配管２、３の
途中に設けられたバルブセット４のバルブ制御器１４に
零点補正シーケンスを行なわせて各ストップ弁１０、１
１の開閉と、均圧弁１３の開閉とを制御させるようにし
たので、特別な伝送ラインを配線することなく、差圧伝
送器５の零点補正を行なうことができるとともに、監視
室側での処理を簡素化することができる。As described above, in this embodiment, the host controller 7 generates the zero point correction command and supplies it to the differential pressure transmitter 5 via the transmission line 6, and the intelligent function of this differential pressure transmitter 5 is provided. Is used to cause the valve controller 14 of the valve set 4 provided in the middle of the detection pipes 2 and 3 to perform the zero-point correction sequence to stop the stop valves 10 and 1.
Since the opening / closing of No. 1 and the opening / closing of the pressure equalizing valve 13 are controlled, the zero point correction of the differential pressure transmitter 5 can be performed without wiring a special transmission line, and the processing on the monitoring room side can be performed. Can be simplified.
【００２７】また、上述した実施例においては、差圧伝
送器５で測定された圧力差を４−２０ｍＡの伝送信号で
上位制御装置７に伝送するようにしているが、これをデ
ジタル信号で伝送するようにしても良い。Further, in the above-mentioned embodiment, the pressure difference measured by the differential pressure transmitter 5 is transmitted to the host controller 7 by a transmission signal of 4-20 mA, but this is transmitted as a digital signal. It may be done.
【００２８】また、上述した実施例においては、差圧伝
送器５に零点補正指令が入力されたとき、直前に得られ
た圧力差信号をホールドさせてこれを零点補正が終了す
るまで、保持させるようにしているが、零点補正指令が
入力された後、差圧伝送器５から受信確認信号を出力さ
せて、これを上位制御装置７で受信した後、前記差圧伝
送器５から出力される圧力差を示す伝送信号を無効に
し、前記差圧伝送器５から零点補正終了信号が出力され
た後、前記差圧伝送器５から出力される圧力差を示す伝
送信号を有効にするようにしても良い。In the above embodiment, when the zero point correction command is input to the differential pressure transmitter 5, the pressure difference signal obtained immediately before is held and held until the zero point correction is completed. However, after the zero-point correction command is input, the differential pressure transmitter 5 outputs a reception confirmation signal, which is received by the host controller 7, and then output from the differential pressure transmitter 5. The transmission signal indicating the pressure difference is invalidated, and after the zero point correction end signal is output from the differential pressure transmitter 5, the transmission signal indicating the pressure difference output from the differential pressure transmitter 5 is validated. Is also good.
【００２９】[0029]
【発明の効果】以上説明したように本発明によれば、特
別な伝送ラインを配線することなく、差圧伝送器の零点
補正を行なうことができるとともに、監視室側での処理
を簡素化することができる。As described above, according to the present invention, the zero point of the differential pressure transmitter can be corrected without wiring a special transmission line, and the processing on the monitoring room side is simplified. be able to.
【図１】本発明による流量測定装置の一実施例を示すブ
ロック図である。FIG. 1 is a block diagram showing an embodiment of a flow rate measuring device according to the present invention.
【図２】従来から知られている流量測定装置の一例を示
すブロック図である。FIG. 2 is a block diagram showing an example of a conventionally known flow rate measuring device.
１ 配管 ２、３ 検出配管 ４ バルブセット ５ 差圧伝送器 ６ 伝送ライン ７ 上位制御装置 ８ オリフィス １０、１１ ストップ弁 １３ 均圧弁 １４ バルブ制御器 1 Piping 2, 3 Detection Piping 4 Valve Set 5 Differential Pressure Transmitter 6 Transmission Line 7 Upper Control Device 8 Orifice 10, 11 Stop Valve 13 Pressure Equalizing Valve 14 Valve Controller
Claims (1)
フィスの上流側と、下流側とに各々、接続される検出配
管と、 これらの各検出配管によって導かれた圧力の差を検出す
る差圧伝送器と、 この差圧伝送器によって検出された圧力差を上位制御装
置に伝送する伝送ラインと、 前記各検出配管の途中に各々、設けられる常開のストッ
プ弁と、 これらの各ストップ弁の吐出側を連通させる連通配管に
常閉の均圧弁と、 前記伝送ラインを介して零点補正信号が送られて前記差
圧伝送器から零点補正信号が出力されたとき、前記各ス
トップ弁を閉じるとともに、前記均圧弁を開かせて前記
差圧伝送器に零点補正を行なわせるバルブ制御器と、 を備えたことを特徴とする流量測定装置。1. A detection pipe connected to each of an upstream side and a downstream side of an orifice provided in a pipe system through which a fluid flows, and a difference for detecting a pressure difference introduced by each of these detection pipes. A pressure transmitter, a transmission line for transmitting the pressure difference detected by the differential pressure transmitter to the host controller, a normally open stop valve provided in the middle of each of the detection pipes, and each of these stop valves. A normally-equalized pressure equalizing valve in a communication pipe that communicates the discharge side of each of the stop valves, and when the zero-point correction signal is output from the differential pressure transmitter through the transmission line and the zero-point correction signal is output, the stop valves are closed. And a valve controller that opens the pressure equalizing valve to cause the differential pressure transmitter to perform zero point correction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4091384A JPH05288584A (en) | 1992-04-13 | 1992-04-13 | Flow rate measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4091384A JPH05288584A (en) | 1992-04-13 | 1992-04-13 | Flow rate measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05288584A true JPH05288584A (en) | 1993-11-02 |
Family
ID=14024882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4091384A Pending JPH05288584A (en) | 1992-04-13 | 1992-04-13 | Flow rate measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05288584A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2368398A (en) * | 2000-09-27 | 2002-05-01 | Blease Medical Equipment Ltd | Apparatus and method for measuring fluid flow |
| JP2005516192A (en) * | 2002-01-16 | 2005-06-02 | フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー | Flow measurement module and method |
-
1992
- 1992-04-13 JP JP4091384A patent/JPH05288584A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2368398A (en) * | 2000-09-27 | 2002-05-01 | Blease Medical Equipment Ltd | Apparatus and method for measuring fluid flow |
| JP2005516192A (en) * | 2002-01-16 | 2005-06-02 | フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー | Flow measurement module and method |
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