JPS6313457Y2 - - Google Patents
Info
- Publication number
- JPS6313457Y2 JPS6313457Y2 JP8575982U JP8575982U JPS6313457Y2 JP S6313457 Y2 JPS6313457 Y2 JP S6313457Y2 JP 8575982 U JP8575982 U JP 8575982U JP 8575982 U JP8575982 U JP 8575982U JP S6313457 Y2 JPS6313457 Y2 JP S6313457Y2
- Authority
- JP
- Japan
- Prior art keywords
- level detection
- liquid level
- electrodes
- detection electrode
- electrode
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Description
【考案の詳細な説明】 この考案は液面検出装置の改良に関する。[Detailed explanation of the idea] This invention relates to an improvement of a liquid level detection device.
たとえば第１図に示すように、容器１内に１対
のレベル検出電極２ａと２ｂを垂設して、第２図
に示すように、一方の電極２ａを＋電源VDDに接
続し、他方の電極２ｂをバツフア３に接続して、
容器１内の液４のレベルの高低に応じて、バツフ
ア３から信号を生じて、たとえば発光ダイオード
５を点滅するようにした液面検出装置は、従来
は、両方のレベル検出電極２ａ，２ｂは同種の金
属を用いていた。それ故、両レベル検出電極間に
電流を流すと、液中の電気分解によつて生じたガ
スが電極に付着し、電極間抵抗が増加し、バツフ
ア３の入力電圧が低下して、同じ液面レベルであ
つても長時間経過した場合、発光ダイオードが消
灯するという欠点があつた。 For example, as shown in FIG. 1, a pair of level detection electrodes 2a and 2b are installed vertically in a container 1, and as shown in FIG . Connect the electrode 2b to the buffer 3,
Conventionally, in a liquid level detection device that generates a signal from a buffer 3 to blink a light emitting diode 5 depending on the level of the liquid 4 in a container 1, both level detection electrodes 2a and 2b are The same type of metal was used. Therefore, when a current is passed between both level detection electrodes, the gas generated by electrolysis in the liquid adheres to the electrodes, the resistance between the electrodes increases, and the input voltage of buffer 3 decreases. Even at surface level, there was a drawback that the light emitting diode would turn off after a long period of time.
この考案は上述の欠点を除くためになされたも
のであつて、それぞれのレベル検出電極の金属を
異種のものとすることにより、単極電位の相違に
よつて、電極間抵抗の増加による電圧降下を補償
して、正確な液面レベルを検出できる装置を提供
することを目的とする。 This idea was made in order to eliminate the above-mentioned drawbacks, and by using different metals for each level detection electrode, voltage drop due to increase in inter-electrode resistance due to difference in unipolar potential. The purpose of the present invention is to provide a device that can accurately detect the liquid level by compensating for the
以下、この考案の一実施例について説明する
と、第１図、第２図における液面検出装置におい
て、＋VDD側に接続するレベル検出電極２ａには
アルミニウムを用い、また負側に接続されるレベ
ル検出電極２ｂにはステンレス鋼を用いると、液
体が水である場合、両電極２ａ，２ｂの単極電位
の相違によつてレベル検出電極２ｂには、上記単
極電位の差の分が、レベル検出電極２ｂに加算さ
れ、バツフア増幅器３への入力電圧もそれだけ高
くなる。即ちバツフア増幅器３の入力電圧
（VIN）＝Ｒ／Ｒ＋電極間抵抗×VDD＋接触電位差とな
る。 An embodiment of this invention will be described below. In the liquid level detection device shown in FIGS. 1 and 2, aluminum is used for the level detection electrode 2a connected to the +V DD side, and the level detection electrode 2a connected to the negative side is When stainless steel is used for the detection electrode 2b, when the liquid is water, the level detection electrode 2b has a level corresponding to the difference in monopolar potential due to the difference in monopolar potential between the two electrodes 2a and 2b. This is added to the detection electrode 2b, and the input voltage to the buffer amplifier 3 also increases accordingly. That is, the input voltage (V IN ) of the buffer amplifier 3 = R/R + resistance between electrodes x V DD + contact potential difference.
したがつて、両電極にガス等が付着して、電極
間抵抗が増加しても、バツフア増幅器の入力電圧
は高く保たれ、その結果、同じ液面レベルに対し
て、バツフア増幅器３の出力が変化するというよ
うな不具合は生じない。 Therefore, even if gas etc. adheres to both electrodes and the resistance between the electrodes increases, the input voltage of the buffer amplifier is kept high, and as a result, the output of the buffer amplifier 3 for the same liquid level is No problems such as changes will occur.
以上詳述したようにこの考案はレベル検出電極
の材質を相互に異ならせることによつて、従来の
ようにレベル検出電極間の抵抗増大による検出動
作の誤りを防止でき、簡単な装置で、誤動作のな
いレベル検出装置を提供できる。 As detailed above, this device uses different materials for the level detection electrodes to prevent errors in detection operations caused by increased resistance between the level detection electrodes, and is simple and easy to use. It is possible to provide a level detection device without
なお、この考案の液面検出装置は、電気湯沸し
器等の液面レベル検出に好適である。またレベル
検出電極は２本に限らず１本を共通に、他を複数
本として、多段に液面レベルを検出するようにし
たものでもよい。 The liquid level detection device of this invention is suitable for detecting the liquid level of electric water heaters and the like. Further, the number of level detection electrodes is not limited to two, but one may be used in common, and the other may be a plurality of electrodes so as to detect the liquid level in multiple stages.
第１図はこの考案が適用される液面検出装置の
一例を示す図、第２図は第１図の装置に用いられ
る電気回路の一例を示す回路図である。
１……容器、２ａ，２ｂ……レベル検出電極、
３……バツフア増幅器。
FIG. 1 is a diagram showing an example of a liquid level detection device to which this invention is applied, and FIG. 2 is a circuit diagram showing an example of an electric circuit used in the device of FIG. 1... Container, 2a, 2b... Level detection electrode,
3... Buffer amplifier.
Claims (1)
器内に垂下し、一方の液面検出電極は電源の一方
の極性に接続し、他方の極性の液面検出電極から
該容器内の液面レベルを表わす信号を得るように
した液面検出装置において、両液面検出電極とし
て異種の金属を用いたことを特徴とする液面検出
装置。 A first liquid level detection electrode and a second liquid level detection electrode are suspended in the container, one liquid level detection electrode is connected to one polarity of a power source, and the liquid level detection electrode of the other polarity is connected to the inside of the container. What is claimed is: 1. A liquid level detection device for obtaining a signal representing a liquid level, characterized in that both liquid level detection electrodes are made of different metals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8575982U JPS58187734U (en) | 1982-06-08 | 1982-06-08 | Liquid level detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8575982U JPS58187734U (en) | 1982-06-08 | 1982-06-08 | Liquid level detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58187734U JPS58187734U (en) | 1983-12-13 |
| JPS6313457Y2 true JPS6313457Y2 (en) | 1988-04-16 |
Family
ID=30094607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8575982U Granted JPS58187734U (en) | 1982-06-08 | 1982-06-08 | Liquid level detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58187734U (en) |
-
1982
- 1982-06-08 JP JP8575982U patent/JPS58187734U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58187734U (en) | 1983-12-13 |
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