JPH09196733A - Water level sensor - Google Patents
Water level sensorInfo
- Publication number
- JPH09196733A JPH09196733A JP817396A JP817396A JPH09196733A JP H09196733 A JPH09196733 A JP H09196733A JP 817396 A JP817396 A JP 817396A JP 817396 A JP817396 A JP 817396A JP H09196733 A JPH09196733 A JP H09196733A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- cable
- water level
- wire
- level sensor
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は水位センサに関
し、特に、水頭圧を受けるための感圧素子を備えたよう
な水位センサに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level sensor, and more particularly to a water level sensor including a pressure sensitive element for receiving a head pressure.
【０００２】[0002]
【従来の技術】水位センサは、センサ部内に水頭圧を受
けるための感圧センサを内蔵し、センサ部を水中に沈
め、地上にセンサ部からの出力を処理するアンプを配置
し、センサ部とアンプとをシールド付のケーブルで接続
して構成される。そして、センサ部を湖や貯水池に沈
め、アンプの出力に基づいて常時水位の高さが検出され
る。2. Description of the Related Art A water level sensor has a built-in pressure sensitive sensor for receiving a head pressure in the sensor section, the sensor section is submerged in water, and an amplifier for processing the output from the sensor section is arranged on the ground. It is configured by connecting the amplifier with a shielded cable. Then, the sensor unit is submerged in a lake or a reservoir, and the height of the water level is constantly detected based on the output of the amplifier.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上述の水位
センサを山の中の湖や貯水池に配置したとき、その周辺
に落雷が起きることがある。このため、落雷によるその
付近の電位が急激に上昇するため、ケーブル内の電位も
上がり、アースに向かって電流が流れ、そのエネルギに
耐えられなかった電子部品などが損傷する恐れがある。
それゆえに、この発明の主たる目的は、落雷による部品
の損傷を防止できるような水位センサを提供することで
ある。However, when the above water level sensor is arranged in a lake in a mountain or a reservoir, a lightning strike may occur around it. For this reason, the potential in the vicinity thereof rapidly rises due to a lightning strike, and the potential in the cable also rises, causing a current to flow toward the ground, which may damage electronic components that cannot withstand the energy.
Therefore, a main object of the present invention is to provide a water level sensor capable of preventing damage to parts due to lightning strike.
【０００４】[0004]
【課題を解決するための手段】この発明は水頭圧を受け
るための感圧素子を備えた水位センサであって、感圧素
子と接続されるセンサ基板と、センサ基板と感圧素子と
を収納し、その全体が電磁シールドされた容器と、シー
ルド線の一端が容器の電磁シールドに接続され、その芯
線の一端がセンサ基板に接続されたケーブルと、ケーブ
ルの芯線の他端に接続され、その全体が電磁シールドさ
れてケーブルのシールド線の他端に接続されたアイソレ
ーション結合素子と、アイソレーション結合素子からの
出力信号を処理する増幅器とを備えて構成される。SUMMARY OF THE INVENTION The present invention is a water level sensor having a pressure sensitive element for receiving a head pressure, and a sensor substrate connected to the pressure sensitive element, and the sensor substrate and the pressure sensitive element. Then, the whole container is electromagnetically shielded, one end of the shield wire is connected to the electromagnetic shield of the container, one end of the core wire is connected to the sensor board, and the other end of the core wire of the cable is connected, The whole is electromagnetically shielded and is provided with an isolation coupling element connected to the other end of the shielded wire of the cable, and an amplifier for processing an output signal from the isolation coupling element.
【０００５】[0005]
【発明の実施の形態】図１はこの発明の一実施形態を示
す図である。図１において、センサ部１はその先端部分
に配置された感圧素子２と、感圧素子２の出力が与えら
れる回路３と含み、回路３は容器内に収納されて樹脂に
よってモールドされる。さらに、センサ１の全体がシー
ルド部材４によって覆われ、電磁シールドされて水中で
大地に接地される。センサ部１の回路３にはケーブル５
の芯線６の一端が接続され、シールド線７の一端はシー
ルド部材４に接続される。FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, the sensor unit 1 includes a pressure sensitive element 2 arranged at the tip portion thereof and a circuit 3 to which the output of the pressure sensitive element 2 is applied. The circuit 3 is housed in a container and molded with resin. Further, the entire sensor 1 is covered with the shield member 4, is electromagnetically shielded, and is grounded in the water. The cable 5 is connected to the circuit 3 of the sensor unit 1.
One end of the core wire 6 is connected, and one end of the shield wire 7 is connected to the shield member 4.
【０００６】一方、ケーブル５の芯線６の他端はアンプ
部８に含まれるアイソレーション結合素子としてのフォ
トカプラ９の発光部１０に接続され、発光部１０に直流
電源１１が接続される。フォトカプラ９の受光部１２は
後段の回路１３に接続され、フォトカプラ９の全体がシ
ールド部材１４によって覆われて電磁シールドされる。
そして、ケーブル５のシールド線７の他端がシールド部
材１４に電気的に接続される。なお、アイソレーション
結合素子としては、フォトカプラ９に限ることなく、電
磁結合素子を用いるようにしてもよい。On the other hand, the other end of the core wire 6 of the cable 5 is connected to a light emitting portion 10 of a photocoupler 9 as an isolation coupling element included in the amplifier portion 8, and a direct current power source 11 is connected to the light emitting portion 10. The light receiving section 12 of the photocoupler 9 is connected to the circuit 13 in the subsequent stage, and the entire photocoupler 9 is covered with the shield member 14 to be electromagnetically shielded.
Then, the other end of the shielded wire 7 of the cable 5 is electrically connected to the shield member 14. The isolation coupling element is not limited to the photocoupler 9, and an electromagnetic coupling element may be used.
【０００７】上述のごとく、この実施形態では、センサ
部１およびアンプ部８全体を電磁シールドし、両者をケ
ーブル５のシールド線７で接続し、センサ部１のシール
ド部材４を大地に接続するようにしたので、近辺に落雷
しても、落雷によって誘起された電位は、アンプ部８の
シールド部材１４からケーブル５のシールド線７および
センサ部１のシールド部材４を介して大地に落ちるた
め、センサ部１の内部回路の電位に影響を与えることが
ない。このため、落雷によりセンサ部１の損傷を防止で
き、損傷するとしてもフォトカプラ９によるアイソソレ
ーション結合素子だけであり、この部分は地上に設置さ
れているので簡単に交換できるため、センサ部１を交換
することなく、簡単に修復することができる。As described above, in this embodiment, the entire sensor section 1 and the amplifier section 8 are electromagnetically shielded, both are connected by the shield wire 7 of the cable 5, and the shield member 4 of the sensor section 1 is connected to the ground. Therefore, even if a lightning strike occurs in the vicinity, the electric potential induced by the lightning strikes from the shield member 14 of the amplifier section 8 to the ground via the shield wire 7 of the cable 5 and the shield member 4 of the sensor section 1, so that the sensor It does not affect the potential of the internal circuit of the section 1. Therefore, the sensor unit 1 can be prevented from being damaged by a lightning strike, and even if it is damaged, only the isolation coupling element by the photocoupler 9 can be easily replaced because it is installed on the ground. Can be easily repaired without replacing.
【０００８】なお、アイソレーション結合素子に、バリ
スタのようなサージ吸収素子を接続すれば、たとえ池の
水がなくなってセンサ１が接地されなくなったとして
も、落雷によって電位が上昇してサージが発生しても、
サージ吸収素子によってそのサージを吸収することがで
き、被害を少なくできる。If a surge absorbing element such as a varistor is connected to the isolation coupling element, even if the water in the pond runs out and the sensor 1 is no longer grounded, the potential rises due to lightning and a surge occurs. Even if
The surge absorbing element can absorb the surge and reduce damage.
【０００９】[0009]
【発明の効果】以上のように、この発明によれば、感圧
素子およびセンサ基板を電磁シールドし、地上に設置さ
れるアンプの前段にアイソレーション結合素子を設け、
このアイソレーション結合素子も電磁シールドしてケー
ブルのシールド線に接続することにより、センサ部とア
イソレーション結合素子全体を電磁シールドすることが
でき、近辺で落雷が生じても、センサ部の電位の上昇を
防止でき、センサ部を構成する電子部品の損傷を少なく
できる。As described above, according to the present invention, the pressure sensitive element and the sensor substrate are electromagnetically shielded, and the isolation coupling element is provided in the preceding stage of the amplifier installed on the ground.
This isolation coupling element is also electromagnetically shielded and connected to the shield wire of the cable, so that the sensor section and the entire isolation coupling element can be electromagnetically shielded. Even if a lightning strike occurs in the vicinity, the potential of the sensor section rises. Can be prevented, and damage to the electronic components forming the sensor unit can be reduced.
【図面の簡単な説明】[Brief description of drawings]
【図１】この発明の一実施形態を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.
１ センサ部 ２ 感圧素子 ３，１３ 回路 ４，１４ シールド部材 ５ ケーブル ６ 芯線 ７ シールド線 ８ アンプ部 ９ フォトカプラ １０ 発光部 １１ 直流電流 １２ 受光部 1 sensor part 2 pressure sensitive element 3,13 circuit 4,14 shield member 5 cable 6 core wire 7 shield wire 8 amplifier part 9 photocoupler 10 light emitting part 11 direct current 12 light receiving part
Claims (1)
水位センサであって、 前記感圧素子と接続されるセンサ基板、 前記センサ基板と前記感圧素子とを収納し、その全体が
電磁シールドされた容器、 そのシールド線の一端が前記容器の電磁シールドに接続
され、その芯線の一端が前記センサ基板に接続されたケ
ーブル、 前記ケーブルの芯線の他端に接続され、その全体が電磁
シールドされ、前記ケーブルのシールド線の他端に接続
されるアイソレーション結合素子、および前記アイソレ
ーション結合素子からの出力信号を処理する増幅器を備
え、 前記容器を水中で接地することを特徴とする、水位セン
サ。1. A water level sensor having a pressure-sensitive element for receiving hydrohead pressure, the sensor substrate being connected to the pressure-sensitive element, the sensor substrate and the pressure-sensitive element housed therein An electromagnetically shielded container, one end of its shield wire is connected to the electromagnetic shield of the container, one end of its core wire is connected to the sensor substrate, the other end of the core wire of the cable, and the whole is electromagnetic. An isolation coupling element that is shielded and is connected to the other end of the shield wire of the cable; and an amplifier that processes an output signal from the isolation coupling element, wherein the container is grounded in water. Water level sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00817396A JP3595053B2 (en) | 1996-01-22 | 1996-01-22 | Water level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00817396A JP3595053B2 (en) | 1996-01-22 | 1996-01-22 | Water level sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09196733A true JPH09196733A (en) | 1997-07-31 |
| JP3595053B2 JP3595053B2 (en) | 2004-12-02 |
Family
ID=11685942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00817396A Expired - Fee Related JP3595053B2 (en) | 1996-01-22 | 1996-01-22 | Water level sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3595053B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643968A (en) * | 2016-12-08 | 2017-05-10 | 太原理工大学 | Field lightning stroke-preventing liquid level monitoring sensor and monitoring method |
-
1996
- 1996-01-22 JP JP00817396A patent/JP3595053B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643968A (en) * | 2016-12-08 | 2017-05-10 | 太原理工大学 | Field lightning stroke-preventing liquid level monitoring sensor and monitoring method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3595053B2 (en) | 2004-12-02 |
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