JPH0835901A - Diagnostic apparatus of differential-pressure detector - Google Patents
Diagnostic apparatus of differential-pressure detectorInfo
- Publication number
- JPH0835901A JPH0835901A JP17388894A JP17388894A JPH0835901A JP H0835901 A JPH0835901 A JP H0835901A JP 17388894 A JP17388894 A JP 17388894A JP 17388894 A JP17388894 A JP 17388894A JP H0835901 A JPH0835901 A JP H0835901A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- valve
- diagnostic
- pressure detector
- opening
- 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.)
- Granted
Links
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は差圧検出器診断装置に関
し、詳しくは、差圧検出器における導圧管路の診断に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential pressure detector diagnosing device, and more particularly to diagnosing a pressure guiding line in a differential pressure detector.
【０００２】[0002]
【従来の技術】図５は差圧検出器の使用概念図である。
図において、１は被測定流体が流れる管路である。管路
１の一部にはオリフィス２が設けられるとともに、オリ
フィス２を挟むようにして導圧管路３，４が設けられて
いる。導圧管路３，４はそれぞれ開閉弁５，６を介して
差圧検出器７に接続されている。また、導圧管路３，４
は、差圧検出器７側において、開閉弁８を介して接続さ
れている。2. Description of the Related Art FIG. 5 is a conceptual diagram of use of a differential pressure detector.
In the figure, reference numeral 1 is a pipeline through which the fluid to be measured flows. An orifice 2 is provided in a part of the conduit 1, and pressure guiding conduits 3 and 4 are provided so as to sandwich the orifice 2. The pressure guiding lines 3 and 4 are connected to the differential pressure detector 7 via the on-off valves 5 and 6, respectively. Also, the pressure conduits 3, 4
Are connected via the on-off valve 8 on the differential pressure detector 7 side.
【０００３】このような構成において、差圧検出器７の
零点チェックは、開閉弁５，６を閉じて開閉弁８を開い
た状態で行う。そして、通常の測定は、開閉弁５，６を
開き開閉弁８を閉じた状態で行う。ところで、このよう
な測定系の故障形態としては、導圧管路３，４のつまり
や差圧検出器７本体の異常が考えられる。In such a structure, the zero point check of the differential pressure detector 7 is performed with the on-off valves 5 and 6 closed and the on-off valve 8 open. The normal measurement is performed with the on-off valves 5 and 6 open and the on-off valve 8 closed. By the way, as such a failure mode of the measuring system, an abnormality of the pressure guiding lines 3 and 4 and the main body of the differential pressure detector 7 can be considered.
【０００４】[0004]
【発明が解決しようとする課題】しかし、このような従
来の構成によれば、導圧管路３，４のつまりと差圧検出
器７本体の異常を差圧検出器７の測定結果の変化だけで
識別することは困難であり、故障の特定にあたっては差
圧検出器７を導圧管路３，４を外して差圧検出器７単体
で動作状態を確認しなければならず、相当の作業工数が
かかるという問題があった。However, according to such a conventional structure, the clogging of the pressure guiding lines 3 and 4 and the abnormality of the main body of the differential pressure detector 7 are caused only by the change of the measurement result of the differential pressure detector 7. Since it is difficult to identify the failure, it is necessary to remove the differential pressure detector 7 from the pressure conduits 3 and 4 and to confirm the operating state of the differential pressure detector 7 alone in order to identify the failure. There was a problem that it took.
【０００５】本発明は、このような従来の問題点を解決
するものであって、その目的は、差圧検出器を取り外す
ことなく導圧管路のつまりと差圧検出器本体の故障とを
識別できるようにした差圧検出器診断装置を実現するこ
とにある。The present invention solves such a conventional problem, and an object thereof is to discriminate between clogging of the pressure guiding line and failure of the main body of the differential pressure detector without removing the differential pressure detector. It is to realize a differential pressure detector diagnostic device that can be performed.
【０００６】[0006]
【課題を解決するための手段】本発明の差圧検出器診断
装置は、被測定流体が流れる管路に導圧管路を介して接
続された差圧検出器と、被測定流体が流れる管路に接続
され、バルブ操作部から出力される開閉操作信号に応じ
て開閉量が制御されるバルブと、診断信号として平均値
が零になる開閉制御信号をバルブの開閉操作信号に選択
的に重畳する診断信号発生部を有するバルブ操作部と、
診断信号重畳時の差圧検出器の応答特性に基づいて導圧
管路のつまりと差圧検出器本体の故障とを識別する故障
識別部、とで構成されたことを特徴とする。A differential pressure detector diagnostic apparatus according to the present invention comprises a differential pressure detector connected to a pipeline through which a fluid to be measured flows via a pressure guiding pipeline, and a pipeline through which a fluid to be measured flows. And a valve whose opening / closing amount is controlled according to an opening / closing operation signal output from the valve operating unit and an opening / closing control signal whose average value becomes zero as a diagnostic signal are selectively superimposed on the opening / closing operation signal of the valve. A valve operating section having a diagnostic signal generating section,
It is characterized in that it is constituted by a failure identifying section for identifying a blockage of the pressure guiding line and a failure of the main body of the differential pressure detector based on the response characteristic of the differential pressure detector when the diagnostic signal is superimposed.
【０００７】[0007]
【作用】導圧管路のつまりの有無による診断信号重畳時
の差圧検出器の応答特性の変化は、実験により予め求め
ておくことができる。従って、診断信号重畳時の差圧検
出器の応答特性に基づいて、導圧管路のつまりと差圧検
出器本体の故障とを的確に識別できる。The change in the response characteristic of the differential pressure detector when the diagnostic signal is superposed due to the presence or absence of the blockage of the pressure guiding line can be obtained in advance by an experiment. Therefore, based on the response characteristic of the differential pressure detector when the diagnostic signal is superimposed, it is possible to accurately identify the blockage of the pressure guiding line and the failure of the differential pressure detector main body.
【０００８】[0008]
【実施例】以下、図面を用いて本発明の実施例を説明す
る。図１は本発明の一実施例を示すブロック図であり、
図５と共通する部分には同一符号を付けている。図にお
いて、１０は差圧測定系であり、その構成は図５と同様
である。２０はバルブ系であり、被測定流体が流れる管
路１に接続されたバルブ２１と、このバルブ２１に開閉
操作信号を加えるポジショナなどのバルブ操作部２２と
で構成されている。３０はコントローラであり、差圧測
定系１０の出力信号に基づいてバルブ系２０にバルブ２
１の弁開度設定信号を出力する。また、コントローラ３
０には実験により予め求められた導圧管路のつまりの有
無による診断信号重畳時の差圧検出器の応答時間などの
応答特性の変化データも格納されていて、診断信号重畳
時の差圧検出器の応答波形に基づいて導圧管路のつまり
と差圧検出器本体の故障とを識別する故障識別部として
も機能する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
The same parts as those in FIG. 5 are designated by the same reference numerals. In the figure, reference numeral 10 is a differential pressure measuring system, and its configuration is the same as in FIG. Reference numeral 20 denotes a valve system, which includes a valve 21 connected to the conduit 1 through which the fluid to be measured flows, and a valve operating unit 22 such as a positioner that applies an opening / closing operation signal to the valve 21. Reference numeral 30 is a controller, which controls the valve system 20 based on the output signal of the differential pressure measurement system 10 to control the valve 2
The valve opening setting signal of 1 is output. Controller 3
0 also stores the change data of response characteristics such as the response time of the differential pressure detector when the diagnostic signal is superposed depending on the presence or absence of the pressure guiding line clogged by the experiment, and the differential pressure detection when the diagnostic signal is superposed. It also functions as a failure discriminating section that discriminates between the blockage of the pressure guiding line and the failure of the differential pressure detector main body based on the response waveform of the pressure vessel.
【０００９】図２はバルブ操作部２２の具体例を示すブ
ロック図である。図において、２３は入力信号検出部で
あり、コントローラ３０から弁開度設定信号が加えられ
るとともに、診断信号発生部２４から選択的に診断信号
として平均値が零になる開閉制御信号が加えられる。２
５は診断起動部であり、診断信号発生部２４を選択的に
起動する。２６は演算部であり、入力信号検出部２３の
出力信号および弁開度検出部２７の出力信号に基づいて
電空変換部２８にバルブ２１の開閉度を所望の値に制御
するための制御信号を出力する。弁開度検出部２７はバ
ルブ２１の開閉度に応じた信号を演算部２６に帰還す
る。電空変換部２８は、演算部２６から加えられる制御
信号に応じてバルブ２１を開閉操作するための空気信号
を生成して出力する。FIG. 2 is a block diagram showing a specific example of the valve operating section 22. In the figure, reference numeral 23 denotes an input signal detecting unit, to which a valve opening setting signal is added from the controller 30 and an opening / closing control signal whose average value becomes zero is selectively added as a diagnostic signal from the diagnostic signal generating unit 24. Two
Reference numeral 5 is a diagnostic activation unit, which selectively activates the diagnostic signal generation unit 24. Reference numeral 26 denotes a calculation unit, which is a control signal for controlling the opening / closing degree of the valve 21 to a desired value to the electropneumatic conversion unit 28 based on the output signal of the input signal detection unit 23 and the output signal of the valve opening detection unit 27. Is output. The valve opening degree detector 27 feeds back a signal according to the degree of opening / closing of the valve 21 to the calculator 26. The electropneumatic conversion unit 28 generates and outputs an air signal for opening and closing the valve 21 according to the control signal applied from the calculation unit 26.
【００１０】図３は本発明の動作の流れを説明するフロ
ーチャート、図４は本発明の動作を説明する各部の波形
図である。診断起動部２５で診断動作の起動が指示され
ることにより、図４（Ａ）のような診断信号が診断信号
発生部２４から入力信号検出部２３に加えられる（ステ
ップ）。ここで、診断信号としては、平均値が零にな
るバルブ２１の開閉度が±１０％程度で２周期分の時間
が３０秒程度の開閉制御信号を出力する。入力信号検出
部２３はこの診断信号をコントローラ３０から加えられ
る信号に選択的に重畳して演算部２６に出力し、演算部
２６は診断信号が重畳された開閉操作信号を電空変換部
２８に出力する。これにより、バルブ２１の弁開度は図
４（Ｂ）のように診断信号に同期して変化し、この弁開
度の変化は弁開度検出部２７で検出されて演算部２６に
帰還される（ステップ）。FIG. 3 is a flow chart for explaining the operation flow of the present invention, and FIG. 4 is a waveform diagram of each part for explaining the operation of the present invention. When the diagnostic activation unit 25 gives an instruction to activate the diagnostic operation, a diagnostic signal as shown in FIG. 4A is added from the diagnostic signal generation unit 24 to the input signal detection unit 23 (step). Here, as the diagnostic signal, an opening / closing control signal for which the opening / closing degree of the valve 21 having an average value of zero is about ± 10% and the time for two cycles is about 30 seconds is output. The input signal detection unit 23 selectively superimposes this diagnostic signal on the signal applied from the controller 30 and outputs it to the arithmetic unit 26. The arithmetic unit 26 outputs the opening / closing operation signal on which the diagnostic signal is superposed to the electropneumatic conversion unit 28. Output. As a result, the valve opening degree of the valve 21 changes in synchronization with the diagnostic signal as shown in FIG. 4B, and the change in the valve opening degree is detected by the valve opening degree detection unit 27 and fed back to the calculation unit 26. (Step).
【００１１】一方、差圧測定系１０において、差圧検出
器７はバルブ２１の開閉動作に伴う被測定流体の圧力変
化を検出し（ステップ）、測定結果をコントローラ３
０に出力する。図４（Ｃ）は導圧管路３，４につまりが
ない正常な状態での差圧測定出力波形を示し、図４
（Ｄ）は導圧管路３，４につまりが発生している異常な
状態での差圧測定出力波形を示している。ここで、ｔs
は導圧管路３，４につまりがない正常な状態での応答時
間、ｔ1は導圧管路３，４につまりが発生している異常
な状態での応答時間である。そこで、故障識別部は、例
えば（ｔ1−ｔs）を演算してその演算結果を予め設定し
ている判定定数ａと比較し、 （ｔ1−ｔs）＜ａ のときは導圧管路３，４につまりがない正常な状態と判
断し（ステップ）、 （ｔ1−ｔs）＞ａ のときは導圧管路３，４につまりが発生している異常な
状態と判断して必要に応じてアラームを出力する（ステ
ップ）。On the other hand, in the differential pressure measuring system 10, the differential pressure detector 7 detects the pressure change of the fluid to be measured due to the opening / closing operation of the valve 21 (step), and the measurement result is obtained by the controller 3
Output to 0. FIG. 4C shows a differential pressure measurement output waveform in a normal state in which the pressure guiding lines 3 and 4 are not clogged.
(D) shows a differential pressure measurement output waveform in an abnormal state where the pressure guiding lines 3 and 4 are clogged. Where ts
Is a response time in a normal state in which the pressure guiding lines 3 and 4 are not clogged, and t 1 is a response time in an abnormal state in which the pressure guiding lines 3 and 4 are clogged. Therefore, the failure identifying unit calculates, for example, (t 1 −t s ) and compares the calculation result with a preset determination constant a, and when (t 1 −t s ) <a, 3 and 4 is determined that the normal state without clogging (step), necessary to determine an abnormal condition in which clogging has occurred in the pressure guiding tube path 3 and 4 when the (t 1 -t s)> a An alarm is output according to (step).
【００１２】このように構成することにより、従来のよ
うに差圧検出器７を取り外すことなく、診断起動を指示
するだけの簡単な操作で導圧管路３，４のつまりの有無
を識別できる。なお、上記実施例では診断項目として応
答時間に着目して導圧管路３，４のつまりの有無を識別
しているが、例えば図４の出力電圧ＶSとＶ1の違いに着
目して感度を診断項目にしてもよいし、応答波形パター
ン自体が診断項目であってもよい。With such a configuration, it is possible to identify the presence or absence of clogging of the pressure guiding conduits 3 and 4 by a simple operation of only instructing the start of diagnosis without removing the differential pressure detector 7 as in the conventional case. In the above-described embodiment, the presence or absence of clogging of the pressure guiding lines 3 and 4 is identified by focusing on the response time as a diagnostic item. For example, the sensitivity is focused on the difference between the output voltages V S and V 1 in FIG. May be the diagnostic item, or the response waveform pattern itself may be the diagnostic item.
【００１３】また、故障識別部の機能をバルブ操作部２
２の演算部２６に組み込んでもよいし、故障識別部を含
むコントローラの機能を差圧測定系１０またはバルブ系
２０に設けてもよい。Further, the function of the failure identifying section is changed to the valve operating section 2
The differential pressure measuring system 10 or the valve system 20 may be provided with the function of the controller including the failure identifying unit.
【００１４】[0014]
【発明の効果】以上説明したように、本発明によれば、
差圧検出器を取り外すことなく導圧管路のつまりと差圧
検出器本体の故障とを識別できるようにした差圧検出器
診断装置を実現できる。As described above, according to the present invention,
It is possible to realize a differential pressure detector diagnostic device capable of distinguishing between clogging of the pressure guiding line and failure of the differential pressure detector main body without removing the differential pressure detector.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.
【図２】図１の要部の具体例を示すブロック図である。FIG. 2 is a block diagram showing a specific example of a main part of FIG.
【図３】本発明の動作の流れを示すフローチャートであ
る。FIG. 3 is a flowchart showing a flow of operations of the present invention.
【図４】本発明の動作を説明する各部の波形図である。FIG. 4 is a waveform chart of each part for explaining the operation of the present invention.
【図５】差圧検出器の使用概念図である。FIG. 5 is a conceptual diagram of use of a differential pressure detector.
１ 管路 ２ オリフィス ３，４ 導圧管路 ５，６，８ 開閉弁 ７ 差圧検出器 １０ 差圧測定系 ２０ バルブ系 ２１ バルブ ２２ バルブ操作部 ３０ コントローラ 1 Pipeline 2 Orifice 3,4 Pressure transmission pipe 5,6,8 Open / close valve 7 Differential pressure detector 10 Differential pressure measurement system 20 Valve system 21 Valve 22 Valve operating part 30 Controller
Claims (1)
て接続された差圧検出器と、 被測定流体が流れる管路に接続され、バルブ操作部から
出力される開閉操作信号に応じて開閉量が制御されるバ
ルブと、 診断信号として平均値が零になる開閉制御信号をバルブ
の開閉操作信号に選択的に重畳する診断信号発生部を有
するバルブ操作部と、 診断信号重畳時の差圧検出器の応答特性に基づいて導圧
管路のつまりと差圧検出器本体の故障とを識別する故障
識別部、とで構成されたことを特徴とする差圧検出器診
断装置。1. A differential pressure detector connected to a pipeline through which a fluid to be measured flows via a pressure guiding pipeline, and an opening / closing operation signal output from a valve operating section connected to a pipeline through which a fluid to be measured flows. The valve opening / closing amount is controlled accordingly, and the valve operation unit has a diagnostic signal generator that selectively superimposes the opening / closing control signal whose average value is zero as the diagnostic signal on the valve opening / closing operation signal. A differential pressure detector diagnostic device, comprising: a fault identifying unit for identifying a blockage of the pressure guiding line and a fault of the differential pressure detector main body based on the response characteristic of the differential pressure detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17388894A JP3147275B2 (en) | 1994-07-26 | 1994-07-26 | Differential pressure detector diagnostic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17388894A JP3147275B2 (en) | 1994-07-26 | 1994-07-26 | Differential pressure detector diagnostic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0835901A true JPH0835901A (en) | 1996-02-06 |
| JP3147275B2 JP3147275B2 (en) | 2001-03-19 |
Family
ID=15968974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17388894A Expired - Fee Related JP3147275B2 (en) | 1994-07-26 | 1994-07-26 | Differential pressure detector diagnostic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3147275B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006177833A (en) * | 2004-12-24 | 2006-07-06 | Yokogawa Electric Corp | Differential pressure transmitter |
| JP2007047012A (en) * | 2005-08-10 | 2007-02-22 | Yokogawa Electric Corp | Differential pressure measuring device with clogging diagnosis mechanism of lead pipe |
| WO2010042233A2 (en) * | 2008-10-06 | 2010-04-15 | Rosemount Inc. | Pressure-based diagnostic system for process transmitter |
| US8387463B2 (en) | 2008-10-06 | 2013-03-05 | Rosemount Inc. | Pressure-based diagnostic system for process transmitter |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7464721B2 (en) | 2004-06-14 | 2008-12-16 | Rosemount Inc. | Process equipment validation |
-
1994
- 1994-07-26 JP JP17388894A patent/JP3147275B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006177833A (en) * | 2004-12-24 | 2006-07-06 | Yokogawa Electric Corp | Differential pressure transmitter |
| JP2007047012A (en) * | 2005-08-10 | 2007-02-22 | Yokogawa Electric Corp | Differential pressure measuring device with clogging diagnosis mechanism of lead pipe |
| WO2010042233A2 (en) * | 2008-10-06 | 2010-04-15 | Rosemount Inc. | Pressure-based diagnostic system for process transmitter |
| WO2010042233A3 (en) * | 2008-10-06 | 2010-07-22 | Rosemount Inc. | Pressure-based diagnostic system for process transmitter |
| US7918134B2 (en) | 2008-10-06 | 2011-04-05 | Rosemount Inc. | Thermal-based diagnostic system for process transmitter |
| US8387463B2 (en) | 2008-10-06 | 2013-03-05 | Rosemount Inc. | Pressure-based diagnostic system for process transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3147275B2 (en) | 2001-03-19 |
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