JPH0862022A - Method for judging abnormality of water level detection rod - Google Patents
Method for judging abnormality of water level detection rodInfo
- Publication number
- JPH0862022A JPH0862022A JP22414794A JP22414794A JPH0862022A JP H0862022 A JPH0862022 A JP H0862022A JP 22414794 A JP22414794 A JP 22414794A JP 22414794 A JP22414794 A JP 22414794A JP H0862022 A JPH0862022 A JP H0862022A
- Authority
- JP
- Japan
- Prior art keywords
- water level
- level detection
- detection rod
- rod
- signal
- 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
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、液体を貯留する容器
内の水位を検出するための水位検出棒において、この水
位検出棒が異常が生じていないかどうかを確認する水位
検出棒の異常判定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level detecting rod for detecting the water level in a container for storing a liquid, for determining whether the water level detecting rod is abnormal or not. It is about the method.
【０００２】[0002]
【従来の技術】従来、液体を貯留する容器内の水位を検
出するための手段として、水位検出棒が広く用いられて
いる。この水位検出棒は、その検出端と液体との接触に
よりＯＮ信号が出力され、検出端と液体との接触がない
ときＯＦＦ信号が出力される構成になっている。2. Description of the Related Art Conventionally, a water level detecting rod has been widely used as a means for detecting the water level in a container for storing a liquid. This water level detection rod is configured to output an ON signal when the detection end contacts the liquid, and outputs an OFF signal when the detection end does not contact the liquid.
【０００３】ボイラの缶内水位の検出にも上記の水位検
出棒が一般的に用いられており、この水位検出棒からの
出力信号に応じて給水ポンプを稼動させ、缶内水位を所
定のレベルに維持するようにしている。特に、ボイラの
場合、前記水位検出棒が正常に作動していることが非常
に重要であり、水位検出棒が誤動作をして缶内水位を適
正なレベルに維持できないと、空焚き等を起こして重大
な事故につながる危険性がある。例えば、ボイラの缶水
に含まれる不純物が水位検出棒の絶縁部に付着すると、
短絡を生じることがあり、そうなると、缶水が水位検出
棒の検出端に達していなくてもＯＮ信号を発することに
なる。また、水位検出棒の表面にスケールが付着した
り、電気配線に断線が生じると、缶水が水位検出棒の検
出端に達していなくてもＯＦＦ信号を発することにな
る。The above-mentioned water level detecting rod is generally used to detect the water level in the can of the boiler. The water supply pump is operated in accordance with the output signal from the water level detecting rod to set the water level in the can to a predetermined level. I try to keep it. Especially in the case of a boiler, it is very important that the water level detection rod is operating normally, and if the water level detection rod malfunctions and the water level inside the can cannot be maintained at an appropriate level, it will cause boiled water etc. There is a risk of causing a serious accident. For example, if impurities contained in boiler boiler water adhere to the insulation of the water level detection rod,
A short circuit may occur, and if so, an ON signal will be emitted even if the can water has not reached the detection end of the water level detection rod. Further, if a scale adheres to the surface of the water level detection rod or a break in the electric wiring occurs, an OFF signal will be emitted even if the can water has not reached the detection end of the water level detection rod.
【０００４】特開昭５８−９０２９号公報には、水位検
出端の異常確認方法として、３本以上の水位検出棒にお
いて各水位検出棒の出力信号が矛盾しているとき、水位
検出棒のいずれかが故障していると判断する構成が示さ
れている。即ち、ある測定時点において、下端高さの低
いものがＯＦＦ信号を出力しているにもかかわらず、そ
れより上位のものがＯＮ信号を出力している場合、故障
であると判断するようにしている。しかしながら、この
異常確認方法による場合、故障であると判断することは
できても、どの水位検出棒が故障しているのか特定する
ことは困難である。上位のものが故障しているかもしれ
ないし、下位のものが故障しているかもしれず、どちら
の可能性もある。Japanese Unexamined Patent Publication No. 58-9029 discloses a method for confirming an abnormality at a water level detecting end, when three or more water level detecting rods have inconsistent output signals from the water level detecting rods. There is shown a configuration for determining that a malfunction has occurred. That is, at a certain measurement time point, if one having a lower end height outputs an OFF signal, but one higher than that outputs an ON signal, it is determined that a failure has occurred. There is. However, in the case of this abnormality confirmation method, it is possible to determine that there is a failure, but it is difficult to specify which water level detection rod has a failure. Higher ones may have failed, lower ones may have failed, both possibilities.
【０００５】[0005]
【発明が解決しようとする課題】この発明は、複数本設
けた水位検出棒において、いずれかの水位検出棒に異常
が生じたとき、それを正確にかつ的確に検出し、しかも
どの水位検出棒に異常が生じたのか即座に特定すること
ができるようにすることを目的としている。SUMMARY OF THE INVENTION According to the present invention, in a plurality of water level detecting rods, when any one of the water level detecting rods is abnormal, it is accurately and accurately detected, and which water level detecting rod is present. The purpose is to be able to immediately identify whether an abnormality has occurred in the.
【０００６】[0006]
【課題を解決するための手段】この発明は、上述の課題
に鑑みてなされたもので、具体的には、検出端と液体と
の接触によりＯＮ信号を出力し、検出端と液体との接触
がないときＯＦＦ信号を出力する水位検出棒を２本以上
備え、各水位検出棒の検出端高さを相互に異ならせて設
定し、前記水位検出棒のうちいずれかの水位検出棒にお
いて、ＯＮ→ＯＦＦまたはＯＦＦ→ＯＮ（ＯＮ→ＯＦＦ
→ＯＮまたはＯＦＦ→ＯＮ→ＯＦＦ）の出力信号の変化
があったとき、この水位検出棒を正常と判定し、この正
常な水位検出棒を基準水位検出棒として、基準水位検出
棒より上位の水位検出棒からＯＮ信号が出力されている
場合は、その上位の水位検出棒を異常と判定し、前記基
準水位検出棒より下位の水位検出棒からＯＦＦ信号が出
力されている場合は、その下位の水位検出棒を異常と判
定することを特徴としている。The present invention has been made in view of the above-mentioned problems. Specifically, the present invention outputs an ON signal by contact between a detection end and a liquid, and makes contact between the detection end and the liquid. If there is no water level detection rod that outputs an OFF signal, the heights of the detection ends of the water level detection rods are set to be different from each other, and one of the water level detection rods is turned ON. → OFF or OFF → ON (ON → OFF
→ ON or OFF → ON → OFF), the water level detection rod is judged to be normal, and this normal water level detection rod is used as a reference water level detection rod, and the water level above the reference water level detection rod is determined. When the ON signal is output from the detection rod, the upper water level detection rod is determined to be abnormal, and when the OFF signal is output from the lower water level detection rod than the reference water level detection rod, the lower level is detected. The feature is that the water level detection rod is determined to be abnormal.
【０００７】[0007]
【作用】水位が上昇あるいは下降するのに伴い、水位検
出棒からの出力信号がＯＮ→ＯＦＦまたはＯＦＦ→ＯＮ
（ＯＮ→ＯＦＦ→ＯＮまたはＯＦＦ→ＯＮ→ＯＦＦ）に
変化したとき、その水位検出棒には短絡、断線等の異常
が生じていないということであり、その水位検出棒が正
常に作動していると判定するとともに、この正常な水位
検出棒を基準水位検出棒とし、基準水位検出棒より上位
の水位検出棒からＯＮ信号が出力されている場合は、そ
の上位の水位検出棒を異常と判定し、前記基準水位検出
棒より下位の水位検出棒からＯＦＦ信号が出力されてい
る場合は、その下位の水位検出棒を異常と判定する。[Operation] As the water level rises or falls, the output signal from the water level detection rod turns ON → OFF or OFF → ON
When it changes to (ON → OFF → ON or OFF → ON → OFF), it means that there is no abnormality such as short circuit or disconnection in the water level detection rod, and the water level detection rod is operating normally. This normal water level detection rod is used as a reference water level detection rod, and if an ON signal is output from a water level detection rod above the reference water level detection rod, the water level detection rod above the reference water level detection rod is determined to be abnormal. When the OFF signal is output from the water level detection rods lower than the reference water level detection rod, the water level detection rods below the reference water level detection rod are determined to be abnormal.
【０００８】[0008]
【実施例】以下、この発明の好ましい実施例について説
明する。図１において、所定の位置に固定された第１水
位検出棒１および第２水位検出棒２に対して、液面４が
上昇あるいは下降する構成になっている。各水位検出棒
の検出端（下端部）の高さは、上方より第１水位検出棒
１、第２水位検出棒２の順に設置されている。前記各水
位検出棒の検出端（下端部）と液体との接触によりＯＮ
信号が出力され、検出端（下端部）と液体との接触がな
いときＯＦＦ信号が出力される。これらのＯＮ信号およ
びＯＦＦ信号は制御装置５へ送られる。そして、予め設
定した制御手順に従って給水ポンプ（図示せず）を稼
動、停止させるようにしている。前記制御装置５は、給
水ポンプ等の機器へ制御信号を送るための制御回路の他
に、第１水位検出棒１および第２水位検出棒２に異常が
生じていないかどうかを確認するための判定回路も備え
ている。The preferred embodiments of the present invention will be described below. In FIG. 1, the liquid level 4 rises or falls with respect to the first water level detection rod 1 and the second water level detection rod 2 fixed at a predetermined position. The heights of the detection ends (lower ends) of the water level detection rods are set in the order of the first water level detection rod 1 and the second water level detection rod 2 from above. ON when the detection end (lower end) of each water level detection rod comes into contact with liquid
A signal is output, and an OFF signal is output when there is no contact between the detection end (lower end) and the liquid. These ON signal and OFF signal are sent to the control device 5. Then, the water supply pump (not shown) is operated and stopped in accordance with a preset control procedure. In addition to the control circuit for sending the control signal to the equipment such as the water supply pump, the control device 5 is for confirming whether the first water level detection rod 1 and the second water level detection rod 2 are abnormal. It also has a decision circuit.
【０００９】例えば、上記の構成をボイラの水位制御装
置に適用した場合、第１水位検出棒１が給水ポンプ稼動
・停止用、第２水位検出棒２が燃焼装置停止用として用
いられる。即ち、給水ポンプの稼動により水位が上昇
し、缶内の水位が第１水位検出棒１の検出端に到達する
と、第１水位検出棒１からＯＮ信号が出力され、このＯ
Ｎ信号受信後、設定時間経過後に制御装置５からの指令
信号を受けて給水ポンプが停止する。そして、燃焼装置
の働きにより缶内の水が加熱されて蒸発し、水位が下降
して第１水位検出棒１の検出端を切ると、第１水位検出
棒１からＯＦＦ信号が出力され、このＯＦＦ信号受信
後、設定時間経過後に制御装置５からの指令信号を受け
て給水ポンプが起動する。このようにして、缶内の水位
は所定のレベルに維持される。また、不測の事態によ
り、水位が第１水位検出棒１の検出端を切った後も下降
し続け、第２水位検出棒２の検出端を切ると、第２水位
検出棒２からＯＦＦ信号が出力され、このＯＦＦ信号受
信後、燃焼装置が停止する。For example, when the above structure is applied to the water level control device of the boiler, the first water level detection rod 1 is used for operating / stopping the water supply pump, and the second water level detection rod 2 is used for stopping the combustion device. That is, when the water level rises due to the operation of the water supply pump and the water level in the can reaches the detection end of the first water level detection rod 1, an ON signal is output from the first water level detection rod 1 and this O
After receiving the N signal, the water supply pump is stopped upon receipt of a command signal from the control device 5 after a lapse of a set time. Then, when the water in the can is heated and evaporated by the action of the combustion device and the water level drops and the detection end of the first water level detection rod 1 is cut off, an OFF signal is output from the first water level detection rod 1. After the OFF signal is received, after a set time has elapsed, the water supply pump is activated upon receiving a command signal from the control device 5. In this way, the water level in the can is maintained at a predetermined level. Further, due to an unexpected situation, the water level continues to drop even after the detection end of the first water level detection rod 1 is cut, and when the detection end of the second water level detection rod 2 is cut, an OFF signal is output from the second water level detection rod 2. After being output and receiving this OFF signal, the combustion device stops.
【００１０】前記第１水位検出棒１および第２水位検出
棒２が正常に作動しているかどうかの確認は、次のよう
にして行う。各水位検出棒からは液面４の上昇および下
降に伴って、ＯＮ信号とＯＦＦ信号が交互に出力され
る。従って、各水位検出棒においてＯＮ→ＯＦＦまたは
ＯＦＦ→ＯＮの出力信号の変化があったとき、その水位
検出棒には短絡、断線等の異常が生じていないというこ
とであり、この出力信号の変化があった水位検出棒は正
常に作動していると判定する。また、より確実に第１水
位検出棒１および第２水位検出棒２の作動確認を行う場
合には、ＯＮ→ＯＦＦ→ＯＮまたはＯＦＦ→ＯＮ→ＯＦ
Ｆの出力信号の変化を検出し、これらの出力信号の変化
があったとき、この出力信号の変化があった水位検出棒
は正常に作動していると判定するようにする。The confirmation as to whether the first water level detecting rod 1 and the second water level detecting rod 2 are operating normally is performed as follows. An ON signal and an OFF signal are alternately output from each water level detection rod as the liquid level 4 rises and falls. Therefore, when there is a change in the output signal of ON → OFF or OFF → ON in each water level detection rod, it means that there is no abnormality such as short circuit or disconnection in the water level detection rod. It is determined that the water level detection rod, which was present, is operating normally. Further, when confirming the operation of the first water level detection rod 1 and the second water level detection rod 2 more reliably, ON → OFF → ON or OFF → ON → OF.
Changes in the output signal of F are detected, and when there are changes in these output signals, it is determined that the water level detection rod for which this output signal has changed is operating normally.
【００１１】まず、第１水位検出棒１より、ＯＮ→ＯＦ
ＦまたはＯＦＦ→ＯＮ（ＯＮ→ＯＦＦ→ＯＮまたはＯＦ
Ｆ→ＯＮ→ＯＦＦ）の出力信号の変化があった場合につ
いて説明する。この場合、出力信号の変化があった第１
水位検出棒１は正常に作動していると判定し、この第１
水位検出棒１を基準水位検出棒として、第２水位検出棒
２に異常が生じていないかどうかの判定を行う。即ち、
第１水位検出棒１において出力信号の変化があったとい
うことは、液面４の位置がちょうど第１水位検出棒１の
検出端付近にあるということであり、このとき、第１水
位検出棒１より下位に位置する第２水位検出棒２からは
ＯＮ信号が出力されているはずである。従って、このと
き、第２水位検出棒２からＯＦＦ信号が出力されていれ
ば、第２水位検出棒２に異常が生じていると判定する。First, from the first water level detection rod 1, ON → OF
F or OFF → ON (ON → OFF → ON or OF
A case where there is a change in the output signal (F → ON → OFF) will be described. In this case, the first change in the output signal
It is determined that the water level detection rod 1 is operating normally, and
Using the water level detection rod 1 as a reference water level detection rod, it is determined whether or not there is an abnormality in the second water level detection rod 2. That is,
The fact that the output signal has changed in the first water level detection rod 1 means that the position of the liquid level 4 is just near the detection end of the first water level detection rod 1. At this time, An ON signal should be output from the second water level detection rod 2 located below 1. Therefore, at this time, if the OFF signal is output from the second water level detection rod 2, it is determined that the second water level detection rod 2 is abnormal.
【００１２】次に、第２水位検出棒２より、ＯＮ→ＯＦ
ＦまたはＯＦＦ→ＯＮ（ＯＮ→ＯＦＦ→ＯＮまたはＯＦ
Ｆ→ＯＮ→ＯＦＦ）の出力信号の変化があった場合につ
いて説明する。この場合、出力信号の変化があった第２
水位検出棒２は正常に作動していると判定し、この第２
水位検出棒２を基準水位検出棒として、第１水位検出棒
１に異常が生じていないかどうかの判定を行う。即ち、
第２水位検出棒２において出力信号の変化があったとい
うことは、液面４の位置が、ちょうど第２水位検出棒２
の検出端付近にあるということであり、このとき、第２
水位検出棒２より上位に位置する第１水位検出棒１から
はＯＦＦ信号が出力されているはずである。従って、こ
のとき、第１水位検出棒１からＯＮ信号が出力されてい
れば、第１水位検出棒１に異常が生じていると判定す
る。Next, from the second water level detecting rod 2, ON → OF
F or OFF → ON (ON → OFF → ON or OF
A case where there is a change in the output signal (F → ON → OFF) will be described. In this case, there was a change in the output signal
It is determined that the water level detection rod 2 is operating normally, and the second
Using the water level detection rod 2 as a reference water level detection rod, it is determined whether or not there is an abnormality in the first water level detection rod 1. That is,
The fact that there is a change in the output signal at the second water level detecting rod 2 means that the position of the liquid level 4 is just the second water level detecting rod 2
Is near the detection end of the
The OFF signal should be output from the first water level detection rod 1 located above the water level detection rod 2. Therefore, at this time, if the ON signal is output from the first water level detection rod 1, it is determined that the first water level detection rod 1 is abnormal.
【００１３】図２に示す実施例は、第１水位検出棒１、
第２水位検出棒２および第３水位検出棒３の３本の水位
検出棒を設けている。各水位検出棒の検出端（下端部）
の高さは、上方より第１水位検出棒１、第２水位検出棒
２、第３水位検出棒３の順に設置されている。同図に示
す構成をボイラの水位制御装置に適用した場合、第１水
位検出棒１が給水ポンプ停止用、第２水位検出棒２が給
水ポンプ起動用、第３水位検出棒３が燃焼装置停止用と
して用いられる。即ち、給水ポンプの稼動により水位が
上昇し、缶内の水位が第１水位検出棒１の検出端に到達
すると、第１水位検出棒１からＯＮ信号が出力され、こ
のＯＮ信号受信後、給水ポンプが停止する。そして、燃
焼装置の働きにより缶内の水が加熱されて蒸発し、水位
が下降して第２水位検出棒２の検出端を切ると、第２水
位検出棒２からＯＦＦ信号が出力され、このＯＦＦ信号
受信後、給水ポンプが起動する。このようにして、水位
は第１水位検出棒１の検出端と第２水位検出棒２の検出
端との間に維持される。また、不測の事態により、水位
が第２水位検出棒２の検出端を切った後も下降し続け、
第３水位検出棒３の検出端を切ると、第３水位検出棒３
からＯＦＦ信号が出力され、このＯＦＦ信号受信後、燃
焼装置が停止する。In the embodiment shown in FIG. 2, the first water level detecting rod 1,
Three water level detecting rods, a second water level detecting rod 2 and a third water level detecting rod 3, are provided. Detection end (lower end) of each water level detection rod
The height of the first water level detecting rod 1, the second water level detecting rod 2, and the third water level detecting rod 3 are installed in this order from above. When the configuration shown in the figure is applied to the water level control device of the boiler, the first water level detection rod 1 is for stopping the water supply pump, the second water level detection rod 2 is for starting the water supply pump, and the third water level detection rod 3 is for stopping the combustion device. Used for. That is, when the water level rises due to the operation of the water supply pump and the water level in the can reaches the detection end of the first water level detection rod 1, an ON signal is output from the first water level detection rod 1, and after this ON signal is received, water supply is started. Pump stops. Then, when the water in the can is heated and evaporated by the action of the combustion device and the water level drops and the detection end of the second water level detection rod 2 is cut off, an OFF signal is output from the second water level detection rod 2. After receiving the OFF signal, the water supply pump is activated. In this way, the water level is maintained between the detection end of the first water level detection rod 1 and the detection end of the second water level detection rod 2. Also, due to an unforeseen situation, the water level continues to drop even after the detection end of the second water level detection rod 2 is cut,
When the detection end of the third water level detection rod 3 is cut, the third water level detection rod 3
An OFF signal is output from the combustion device, and the combustion device is stopped after receiving the OFF signal.
【００１４】図２に示す実施例においても、前述の実施
例と同様に、第１水位検出棒１、第２水位検出棒２およ
び第３水位検出棒３の各水位検出棒において、液面４の
上昇および下降に伴ってＯＮ信号とＯＦＦ信号が交互に
出力される。従って、各水位検出棒において、ＯＮ→Ｏ
ＦＦまたはＯＦＦ→ＯＮの出力信号の変化があったと
き、その水位検出棒には短絡、断線等の異常が生じてい
ないということであり、この出力信号の変化があった水
位検出棒は正常に作動していると判定する。また、より
確実に第１水位検出棒１、第２水位検出棒２および第３
水位検出棒３の作動確認を行う場合には、ＯＮ→ＯＦＦ
→ＯＮまたはＯＦＦ→ＯＮ→ＯＦＦの出力信号の変化を
検出し、これらの出力信号の変化があったとき、この出
力信号の変化があった水位検出棒は正常に作動している
と判定するようにする。Also in the embodiment shown in FIG. 2, the liquid level 4 is applied to each of the water level detection rods of the first water level detection rod 1, the second water level detection rod 2 and the third water level detection rod 3 as in the above-described embodiment. The ON signal and the OFF signal are alternately output in association with the rise and fall of. Therefore, in each water level detection rod, ON → O
When there is a change in the output signal from FF or OFF to ON, it means that there is no abnormality such as short circuit or disconnection in the water level detection rod, and the water level detection rod with this output signal change is normal. Judge that it is working. Further, the first water level detection rod 1, the second water level detection rod 2 and the third water level detection rod 3
To check the operation of the water level detection rod 3, turn ON → OFF
Change of output signal of ON or OFF → ON → OFF is detected, and when there is a change of these output signals, it is judged that the water level detection rod with the change of this output signal is operating normally. To
【００１５】まず、第１水位検出棒１より、ＯＮ→ＯＦ
ＦまたはＯＦＦ→ＯＮ（ＯＮ→ＯＦＦ→ＯＮまたはＯＦ
Ｆ→ＯＮ→ＯＦＦ）の出力信号の変化があった場合につ
いて説明する。この場合、出力信号の変化があった第１
水位検出棒１は正常に作動していると判定し、この第１
水位検出棒１を基準水位検出棒として、第２水位検出棒
２および第３水位検出棒３に異常が生じていないかどう
かの判定を行う。第１水位検出棒１において出力信号の
変化があったということは、液面４の位置がちょうど第
１水位検出棒１の検出端付近にあるということであり、
このとき、第１水位検出棒１より下位に位置する第２水
位検出棒２および第３水位検出棒３からはＯＮ信号が出
力されているはずである。従って、このとき、第２水位
検出棒２からＯＦＦ信号が出力されていれば第２水位検
出棒２に異常が生じていると判定し、また、第３水位検
出棒３からＯＦＦ信号が出力されていれば第３水位検出
棒３に異常が生じていると判定する。First, from the first water level detection rod 1, ON → OF
F or OFF → ON (ON → OFF → ON or OF
A case where there is a change in the output signal (F → ON → OFF) will be described. In this case, the first change in the output signal
It is determined that the water level detection rod 1 is operating normally, and
Using the water level detection rod 1 as a reference water level detection rod, it is determined whether or not there is an abnormality in the second water level detection rod 2 and the third water level detection rod 3. The fact that the output signal has changed in the first water level detection rod 1 means that the position of the liquid surface 4 is just near the detection end of the first water level detection rod 1,
At this time, the ON signal should be output from the second water level detection rod 2 and the third water level detection rod 3 located below the first water level detection rod 1. Therefore, at this time, if the OFF signal is output from the second water level detection rod 2, it is determined that an abnormality has occurred in the second water level detection rod 2, and the OFF signal is output from the third water level detection rod 3. If so, it is determined that an abnormality has occurred in the third water level detection rod 3.
【００１６】次に、第２水位検出棒２より、ＯＮ→ＯＦ
ＦまたはＯＦＦ→ＯＮ（ＯＮ→ＯＦＦ→ＯＮまたはＯＦ
Ｆ→ＯＮ→ＯＦＦ）の出力信号の変化があった場合につ
いて説明する。この場合、出力信号の変化があった第２
水位検出棒２は正常に作動していると判定し、この第２
水位検出棒２を基準水位検出棒として、第１水位検出棒
１および第３水位検出棒３に異常が生じていないかどう
かの判定を行う。第２水位検出棒２において出力信号の
変化があったということは、液面４の位置がちょうど第
２水位検出棒２の検出端付近にあるということであり、
このとき、第２水位検出棒２より上位に位置する第１水
位検出棒１からはＯＦＦ信号が出力されているはずであ
り、第２水位検出棒２より下位に位置する第３水位検出
棒３からはＯＮ信号が出力されているはずである。従っ
て、このとき、第１水位検出棒１からＯＮ信号が出力さ
れていれば、第１水位検出棒１に異常が生じていると判
定し、第３水位検出棒３からＯＦＦ信号が出力されてい
れば、第３水位検出棒３に異常が生じていると判定す
る。Next, from the second water level detection rod 2, ON → OF
F or OFF → ON (ON → OFF → ON or OF
A case where there is a change in the output signal (F → ON → OFF) will be described. In this case, there was a change in the output signal
It is determined that the water level detection rod 2 is operating normally, and the second
Using the water level detection rod 2 as a reference water level detection rod, it is determined whether or not there is an abnormality in the first water level detection rod 1 and the third water level detection rod 3. The fact that the output signal has changed in the second water level detection rod 2 means that the position of the liquid level 4 is just near the detection end of the second water level detection rod 2,
At this time, the OFF signal should have been output from the first water level detection rod 1 located above the second water level detection rod 2 and the third water level detection rod 3 located below the second water level detection rod 2. The ON signal should have been output from. Therefore, at this time, if the ON signal is output from the first water level detection rod 1, it is determined that the first water level detection rod 1 is abnormal, and the OFF signal is output from the third water level detection rod 3. If so, it is determined that the third water level detection rod 3 is abnormal.
【００１７】さらに、第３水位検出棒３より、ＯＮ→Ｏ
ＦＦまたはＯＦＦ→ＯＮ（ＯＮ→ＯＦＦ→ＯＮまたはＯ
ＦＦ→ＯＮ→ＯＦＦ）の出力信号の変化があった場合に
ついて説明する。この場合、出力信号の変化があった第
３水位検出棒３は正常に作動していると判定し、この第
３水位検出棒３を基準水位検出棒として、第１水位検出
棒１および第２水位検出棒２に異常が生じていないかど
うかの判定を行う。第３水位検出棒３において出力信号
の変化があったということは、液面４の位置がちょうど
第３水位検出棒３の検出端付近にあるということであ
り、このとき、第３水位検出棒３より上位に位置する第
１水位検出棒１および第２水位検出棒２からはＯＦＦ信
号が出力されているはずである。従って、このとき、第
１水位検出棒１からＯＮ信号が出力されていれば、第１
水位検出棒１に異常が生じていると判定し、また、第２
水位検出棒２からＯＮ信号が出力されていれば、第２水
位検出棒２に異常が生じていると判定する。Further, from the third water level detecting rod 3, ON → O
FF or OFF → ON (ON → OFF → ON or O
The case where there is a change in the output signal (FF → ON → OFF) will be described. In this case, it is determined that the third water level detecting rod 3 having a change in the output signal is operating normally, and the third water level detecting rod 3 is used as the reference water level detecting rod, and the first water level detecting rod 1 and the second water level detecting rod 1 are used. It is determined whether or not the water level detection rod 2 is abnormal. The fact that there is a change in the output signal at the third water level detecting rod 3 means that the position of the liquid surface 4 is just near the detection end of the third water level detecting rod 3, and at this time, the third water level detecting rod The OFF signal should be output from the first water level detection rod 1 and the second water level detection rod 2 which are positioned higher than 3. Therefore, at this time, if the ON signal is output from the first water level detection rod 1,
It is determined that an abnormality has occurred in the water level detection rod 1, and the second
If the ON signal is output from the water level detection rod 2, it is determined that the second water level detection rod 2 has an abnormality.
【００１８】前述した実施例は、ボイラに適用した場合
を中心に説明したが、この発明は、ボイラ以外にも給水
タンク等の液体を貯留する容器であれば適用することが
できる。また、前述の実施例では水位検出棒が２本の場
合と３本の場合について説明したが、この発明は４本以
上の場合も勿論適用可能である。さらに、水位検出棒の
異常が検出されたときは、その旨の警報を発するが、異
常が生じている水位検出棒を除いた、正常な水位検出棒
のみの水位制御に切り替えることもできる。Although the above-described embodiments have been mainly described in the case of being applied to a boiler, the present invention can be applied to any container other than the boiler, such as a water tank, for storing liquid. Further, in the above-mentioned embodiment, the case where the number of water level detection rods is 2 and the case where the number of water level detection rods is 3 is described, but the present invention can be applied to the case of 4 or more. Further, when an abnormality of the water level detection rod is detected, an alarm to that effect is issued, but it is also possible to switch to water level control of only the normal water level detection rod excluding the water level detection rod in which the abnormality has occurred.
【００１９】[0019]
【発明の効果】この発明は、以上のような構成であり、
水位検出棒からの出力信号の変化の有無、即ち、ＯＮ→
ＯＦＦまたはＯＦＦ→ＯＮ（ＯＮ→ＯＦＦ→ＯＮまたは
ＯＦＦ→ＯＮ→ＯＦＦ）の出力信号の変化を検出するこ
とにより、水位検出棒が正常に作動していることを確認
し、この正常な水位検出棒を基準にして、上位および下
位の水位検出棒の異常を判定するようにしているので、
複数本設けた水位検出棒のいずれかに異常が生じたと
き、それを正確にかつ的確に検出し、しかも、どの水位
検出棒に異常が生じたのか即座に特定することができ
る。従って、水位検出棒の誤動作を未然に防止して確実
な水位検出を行うことができるとともに、故障箇所の修
復作業も短時間で行うことができる。さらに、この発明
は、水位検出棒が２本以上設けられたものであれば適用
することが可能であり、ＯＮ信号およびＯＦＦ信号が出
力される水位検出棒全般に用いることができ、実用上、
頗る効果的である。The present invention has the above-mentioned structure.
Whether the output signal from the water level detection rod has changed, that is, ON →
By detecting the change of the output signal of OFF or OFF → ON (ON → OFF → ON or OFF → ON → OFF), it is confirmed that the water level detection rod is operating normally. Based on, the upper and lower water level detection rods are judged to be abnormal, so
When an abnormality occurs in any of the plurality of water level detection rods, it can be detected accurately and accurately, and moreover, which water level detection rod has an abnormality can be immediately specified. Therefore, the malfunction of the water level detection rod can be prevented in advance, and the reliable water level detection can be performed, and the repair work of the defective portion can be performed in a short time. Further, the present invention can be applied as long as two or more water level detection rods are provided, and can be used for all water level detection rods that output an ON signal and an OFF signal.
It is very effective.
【図１】この発明の一実施例を示す説明図である。FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
【図２】この発明の他の実施例を示す説明図である。FIG. 2 is an explanatory view showing another embodiment of the present invention.
【符号の説明】 １ 第１水位検出棒 ２ 第２水位検出棒 ３ 第３水位検出棒 ４ 液面 ５ 制御装置[Explanation of reference symbols] 1st water level detection rod 2 2nd water level detection rod 3 3rd water level detection rod 4 Liquid level 5 Controller
Claims (2)
出力し、検出端と液体との接触がないときＯＦＦ信号を
出力する水位検出棒を２本以上備え、各水位検出棒の検
出端高さを相互に異ならせて設定し、前記水位検出棒の
うちいずれかの水位検出棒において、ＯＮ→ＯＦＦまた
はＯＦＦ→ＯＮの出力信号の変化があったとき、この水
位検出棒を正常と判定し、この正常な水位検出棒を基準
水位検出棒として、基準水位検出棒より上位の水位検出
棒からＯＮ信号が出力されている場合は、その上位の水
位検出棒を異常と判定し、前記基準水位検出棒より下位
の水位検出棒からＯＦＦ信号が出力されている場合は、
その下位の水位検出棒を異常と判定することを特徴とす
る水位検出棒の異常判定方法。1. A water level detection rod that outputs an ON signal when the detection end contacts the liquid and outputs an OFF signal when there is no contact between the detection end and the liquid, and the detection end of each water level detection rod. The heights are set to be different from each other, and when there is a change in the output signal of ON → OFF or OFF → ON in any of the water level detection rods, the water level detection rod is determined to be normal. If this normal water level detection rod is used as a reference water level detection rod and an ON signal is output from a water level detection rod higher than the reference water level detection rod, the higher water level detection rod is determined to be abnormal and If the OFF signal is output from the water level detection rod that is lower than the water level detection rod,
An abnormality determination method for a water level detection rod, characterized in that the water level detection rod at a lower level is determined to be abnormal.
出力し、検出端と液体との接触がないときＯＦＦ信号を
出力する水位検出棒を２本以上備え、各水位検出棒の検
出端高さを相互に異ならせて設定し、前記水位検出棒の
うちいずれかの水位検出棒において、ＯＮ→ＯＦＦ→Ｏ
ＮまたはＯＦＦ→ＯＮ→ＯＦＦの出力信号の変化があっ
たとき、この水位検出棒を正常と判定し、この正常な水
位検出棒を基準水位検出棒として、基準水位検出棒より
上位の水位検出棒からＯＮ信号が出力されている場合
は、その上位の水位検出棒を異常と判定し、前記基準水
位検出棒より下位の水位検出棒からＯＦＦ信号が出力さ
れている場合は、その下位の水位検出棒を異常と判定す
ることを特徴とする水位検出棒の異常判定方法。2. A water level detection rod that outputs an ON signal when the detection end contacts the liquid and outputs an OFF signal when there is no contact between the detection end and the liquid. Each water level detection rod has a detection end. The heights are set to be different from each other, and one of the water level detection rods is ON → OFF → O.
When there is a change in the output signal of N or OFF → ON → OFF, this water level detection rod is judged to be normal, and this normal water level detection rod is used as a reference water level detection rod, and a water level detection rod higher than the reference water level detection rod. If the ON signal is output from the water level detection rod, it is determined that the upper water level detection rod is abnormal, and if the OFF signal is output from the water level detection rod lower than the reference water level detection rod, the lower water level detection rod is detected. A method for determining an abnormality of a water level detection rod, characterized by determining that the rod is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22414794A JP2885086B2 (en) | 1994-08-24 | 1994-08-24 | Water level detection rod abnormality judgment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22414794A JP2885086B2 (en) | 1994-08-24 | 1994-08-24 | Water level detection rod abnormality judgment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0862022A true JPH0862022A (en) | 1996-03-08 |
| JP2885086B2 JP2885086B2 (en) | 1999-04-19 |
Family
ID=16809285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22414794A Expired - Lifetime JP2885086B2 (en) | 1994-08-24 | 1994-08-24 | Water level detection rod abnormality judgment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2885086B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006161791A (en) * | 2004-12-10 | 2006-06-22 | Ebara Corp | Water level control device for plumbing tank |
| JP2011237240A (en) * | 2010-05-10 | 2011-11-24 | Nihon Itomic Co Ltd | Scale detection sensor and scale detection method |
-
1994
- 1994-08-24 JP JP22414794A patent/JP2885086B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006161791A (en) * | 2004-12-10 | 2006-06-22 | Ebara Corp | Water level control device for plumbing tank |
| JP2011237240A (en) * | 2010-05-10 | 2011-11-24 | Nihon Itomic Co Ltd | Scale detection sensor and scale detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2885086B2 (en) | 1999-04-19 |
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