JP2000097748A - Capacitance type immersion pressure water level gage - Google Patents
Capacitance type immersion pressure water level gageInfo
- Publication number
- JP2000097748A JP2000097748A JP10270076A JP27007698A JP2000097748A JP 2000097748 A JP2000097748 A JP 2000097748A JP 10270076 A JP10270076 A JP 10270076A JP 27007698 A JP27007698 A JP 27007698A JP 2000097748 A JP2000097748 A JP 2000097748A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- receiving surface
- detecting element
- water level
- pressure receiving
- 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
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば水処理装置
やマンホールポンプユニット等の水位制御や、合併処理
浄化槽等の流量調整用水中ポンプの定流量制御等の用途
に使用する静電容量型投込圧力式水位計に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitance type projection type used for controlling a water level of, for example, a water treatment apparatus and a manhole pump unit, and a constant flow rate control of a submersible pump for adjusting a flow rate of a combined treatment septic tank. It relates to a pressure type water level gauge.
【０００２】[0002]
【従来の技術】例えば、給排水設備等の水位検出用のセ
ンサとしては、エアーポンプを備え、圧力検出端を大気
中に設置して水位を検出するようにした、いわゆるエア
ーパージ方式を採用した圧力検出素子が一般に広く用い
られている。しかしながら、このようなエアーパージ方
式を採用した水位センサにあっては、装置が複雑化する
ばかりでなく、エアーパージのためのエアーポンプの寿
命が比較的短いために維持管理上に問題があった。2. Description of the Related Art For example, as a sensor for detecting a water level of a water supply / drainage facility, a so-called air purge system is used which is provided with an air pump and a pressure detecting end is installed in the atmosphere to detect a water level. Sensing elements are generally widely used. However, such a water level sensor employing the air purge method not only complicates the apparatus, but also has a problem in maintenance because the life of the air pump for air purge is relatively short. .
【０００３】このため、近年、より簡便な設備で汚水処
理槽やその他一般水槽、池、河川等における水位を検出
できるようにしたものとして、静電容量型投込圧力式水
位計が開発されている。[0003] For this reason, in recent years, a capacitance type injection pressure type water level gauge has been developed as a type capable of detecting a water level in a sewage treatment tank or other general water tanks, ponds, rivers, etc. with simpler equipment. I have.
【０００４】図４は、この種の静電容量型投込圧力式水
位計の従来の一般的な構成を示すもので、下端面に圧力
検出端としての開口部１ａが設けられた略円筒状のハウ
ジング１が備えられ、このハウジング１内に圧力検出素
子２がその受圧面２ａを前記開口部１ａに対面させつつ
Ｏリング３を介して密封収容されている。そして、この
圧力検出素子２からの出力信号を増幅・処理・伝送する
ための変換回路４もハウジング１内に密封収容され、こ
の信号がケーブル５から外部に取り出されるようになっ
ている。更に、ハウジング１の下端には、カバー６がね
じ７を介して取付けられている。FIG. 4 shows a conventional general configuration of this type of capacitance type injection pressure type water level meter, which has a substantially cylindrical shape in which an opening 1a as a pressure detection end is provided on the lower end surface. The pressure detecting element 2 is hermetically housed in the housing 1 via an O-ring 3 with its pressure receiving surface 2a facing the opening 1a. A conversion circuit 4 for amplifying, processing, and transmitting the output signal from the pressure detecting element 2 is also hermetically housed in the housing 1, and this signal is taken out from the cable 5. Further, a cover 6 is attached to the lower end of the housing 1 via screws 7.
【０００５】ここに、前記圧力検出素子２の内部には、
一対の電極が互いに対峙して配置されており、ハウジン
グ１を水中に没した時に前記受圧面２ａに作用する圧力
（水圧）の大きさに比例する前記両電極間の空隙の変化
を静電容量の変化として検出して、水位を検出するよう
になっている。Here, inside the pressure detecting element 2,
A pair of electrodes are arranged so as to face each other, and a change in a gap between the two electrodes, which is proportional to the magnitude of the pressure (water pressure) acting on the pressure receiving surface 2a when the housing 1 is immersed in water, is a capacitance. And the water level is detected.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来の
静電容量型投込圧力式水位計にあっては、水中ポンプの
インバータ運転による電気的ノイズや、水槽等の条件に
起因する電気的ノイズが水中を伝わり、圧力検出素子の
受圧面に直接作用して静電容量が影響を受け、センサ出
力が変動してしまうといった問題があった。However, in the conventional electrostatic capacitance type injection pressure type water level meter, electric noise due to the inverter operation of the submersible pump and electric noise due to the conditions of the water tank and the like are reduced. There is a problem that the sensor output fluctuates due to being transmitted through water and acting directly on the pressure receiving surface of the pressure detecting element to affect the capacitance.
【０００７】本発明は上述した事情に鑑みて為されたも
ので、耐ノイズ性に優れ、高精度に水位を検出できるよ
うにした静電容量型投込圧力式水位計を提供することを
目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a capacitance type injection pressure type water level meter which is excellent in noise resistance and capable of detecting a water level with high accuracy. And
【０００８】[0008]
【課題を解決するための手段】本発明の静電容量型投込
圧力式水位計は、静電容量の変化から受圧面に作用する
圧力を検出する圧力検出素子を備え、この圧力検出素子
の受圧面を樹脂等の絶縁材からなるハウジングの開口部
に配置した静電容量型投込圧力式水位計において、前記
圧力検出素子の受圧面は、前記ハウジングの開口部の開
口端を閉塞する絶縁材からなるダイヤフラムと、該ダイ
ヤフラムと圧力検出素子の受圧面との間に封入した圧力
伝達媒体とにより被覆されたことを特徴とする。According to the present invention, there is provided a capacitance type injection pressure type water level gauge having a pressure detecting element for detecting a pressure acting on a pressure receiving surface from a change in capacitance. In a capacitance type injection pressure type water gauge in which a pressure receiving surface is disposed in an opening of a housing made of an insulating material such as a resin, the pressure receiving surface of the pressure detecting element is an insulating member for closing an open end of the opening of the housing. It is characterized by being covered with a diaphragm made of a material and a pressure transmitting medium sealed between the diaphragm and the pressure receiving surface of the pressure detecting element.
【０００９】これにより、例え水中ポンプのインバータ
運転等による電気的ノイズが水中で発生しても、圧力検
出素子の受圧面には、絶縁材からなるダイヤフラムで電
気的ノイズが遮断され、水圧のみが作用し、電気的ノイ
ズに対して静電容量が影響を受けないようにして、電気
的ノイズによるセンサ出力の変動をなくすことができ
る。即ち、前記ハウジングの開口部の開口端を閉塞する
絶縁材からなるダイヤフラムと、該ダイヤフラムと圧力
検出素子の受圧面との間に封入した圧力伝達媒体とを備
えたことにより、該ダイヤフラムで電気的ノイズを遮断
しつつ、該ダイヤフラムに作用する水圧を、例えばシリ
コンゲル等の圧力伝達媒体で圧力検出素子の受圧面に伝
えることができる。Thus, even if electric noise is generated in the water by the inverter operation of the submersible pump, the electric noise is cut off by the diaphragm made of insulating material on the pressure receiving surface of the pressure detecting element, and only the water pressure is reduced. By acting so that the capacitance is not affected by the electrical noise, fluctuations in the sensor output due to the electrical noise can be eliminated. That is, by providing a diaphragm made of an insulating material for closing the opening end of the opening of the housing, and a pressure transmission medium sealed between the diaphragm and the pressure receiving surface of the pressure detecting element, the diaphragm is electrically connected. The water pressure acting on the diaphragm can be transmitted to the pressure receiving surface of the pressure detecting element by a pressure transmission medium such as silicon gel while blocking noise.
【００１０】また、本発明の静電容量型投込圧力式水位
計は、静電容量の変化から受圧面に作用する圧力を検出
する圧力検出素子を備え、この圧力検出素子の受圧面を
樹脂等の絶縁材からなるハウジングの開口部に配置した
静電容量型投込圧力式水位計において、前記圧力検出素
子の受圧面には、絶縁材となるゴム製薄板を貼り付けた
ことを特徴とする。これにより、絶縁材となるゴム製薄
板でセンサ受圧面に作用する電気的ノイズを遮断するこ
とができる。[0010] The electrostatic capacitance type injection pressure type water level gauge of the present invention is provided with a pressure detecting element for detecting a pressure acting on the pressure receiving surface from a change in capacitance, and the pressure detecting surface of the pressure detecting element is made of resin. In the electrostatic capacitance type injection pressure type water level meter disposed at an opening of a housing made of an insulating material such as, a thin rubber plate serving as an insulating material is attached to a pressure receiving surface of the pressure detecting element. I do. Thus, electrical noise acting on the sensor pressure receiving surface can be cut off by the rubber thin plate serving as the insulating material.
【００１１】また、本発明の静電容量型投込圧力式水位
計は、静電容量の変化から受圧面に作用する圧力を検出
する圧力検出素子を備え、この圧力検出素子の受圧面を
樹脂等の絶縁材からなるハウジングの開口部に配置した
静電容量型投込圧力式水位計において、前記圧力検出素
子の受圧面には、絶縁材となるコーティング層を形成し
たことを特徴とする。これにより、絶縁材となるコーテ
ィング層でセンサ受圧面に作用する電気的ノイズを遮断
することができる。Further, the capacitance-type injection pressure type water level meter of the present invention includes a pressure detection element for detecting a pressure acting on the pressure-receiving surface from a change in capacitance, and the pressure-receiving surface of the pressure detection element is made of resin. In the electrostatic capacitance type injection pressure type water level meter disposed in an opening of a housing made of an insulating material such as above, a coating layer serving as an insulating material is formed on a pressure receiving surface of the pressure detecting element. Thus, electrical noise acting on the sensor pressure receiving surface can be cut off by the coating layer serving as an insulating material.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態の静電
容量型投込圧力式水位計を図１乃至図３に基づいて説明
する。なお、図４に示す従来例と同一又は相当部分には
同一符号を付して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A capacitance type injection pressure type water level meter according to an embodiment of the present invention will be described below with reference to FIGS. The same or corresponding parts as those in the conventional example shown in FIG.
【００１３】図１は、本発明の第１の実施の形態の静電
容量型投込圧力式水位計を示すものである。下端面に圧
力検出端としての開口部１ａが設けられた略円筒状の樹
脂製のハウジング１が備えられ、このハウジング１内に
圧力検出素子２がその受圧面２ａを前記開口部１ａに対
面させつつＯリング３を介して密封収容されている。そ
して、この圧力検出素子２からの出力信号を増幅・処理
・伝送するための変換回路４もハウジング１内に密封収
容され、この信号がケーブル５から取り出されるように
なっている。FIG. 1 shows a capacitance type injection pressure type water level meter according to a first embodiment of the present invention. A substantially cylindrical resin housing 1 having an opening 1a as a pressure detecting end provided on a lower end surface is provided. In the housing 1, a pressure detecting element 2 has a pressure receiving surface 2a facing the opening 1a. While being hermetically contained via an O-ring 3. A conversion circuit 4 for amplifying, processing, and transmitting the output signal from the pressure detection element 2 is also hermetically housed in the housing 1, and the signal is extracted from a cable 5.
【００１４】前記ハウジング１の下端には、樹脂製のカ
バー６がねじ７を介して取付けられているのであるが、
このハウジング１とカバー６との間に、前記開口部１ａ
の開口端を閉塞するゴム製のダイヤフラム１０の周縁部
が挟み込まれて、前記ねじ７で固定されている。更に、
このダイヤフラム１０と圧力検出素子２の受圧面２ａと
の間に、例えばシリコンゲルからなる圧力伝達媒体１１
が封入されて、圧力検出素子２の受圧面２ａを一体に覆
うノイズ遮断手段１２が構成されている。A cover 6 made of resin is attached to the lower end of the housing 1 via screws 7.
The opening 1 a is provided between the housing 1 and the cover 6.
The peripheral edge of a rubber diaphragm 10 that closes the open end of the device is sandwiched and fixed with the screw 7. Furthermore,
Between the diaphragm 10 and the pressure receiving surface 2a of the pressure detecting element 2, a pressure transmitting medium 11 made of, for example, silicon gel is provided.
Are enclosed to form a noise cutoff means 12 that integrally covers the pressure receiving surface 2a of the pressure detection element 2.
【００１５】この水位計は、これを水中に投込した時に
圧力検出素子２の受圧面２ａに作用する水圧の変化に対
応する静電容量の変化から水位を検出するのであり、上
記のように構成することで、例え水中に水中ポンプのイ
ンバータ運転等による電気的ノイズ源があっても、この
ノイズの影響を受けることなく、高精度で水位を検出す
ることができる。This water level gauge detects a water level from a change in capacitance corresponding to a change in water pressure acting on the pressure receiving surface 2a of the pressure detecting element 2 when the water level gauge is thrown into water. With this configuration, even if there is an electrical noise source in the water due to the inverter operation of the submersible pump, the water level can be detected with high accuracy without being affected by the noise.
【００１６】すなわち、水中に電気的ノイズがあって
も、このノイズを絶縁材となるゴム製のダイヤフラム１
０で遮断しつつ、該ダイヤフラム１０に作用する圧力を
圧力伝達媒体１１から圧力検出素子２の受圧面２ａに伝
えることができる。これにより、電気的ノイズが遮断さ
れ、水圧のみが圧力検出素子２の受圧面２ａに作用し、
電気的ノイズに対して静電容量が影響を受けないように
して、電気的ノイズによるセンサ出力の変動をなくすこ
とができると共に、正確な水圧を検出することができ
る。That is, even if there is electric noise in the water, this noise is used as an insulating material for the rubber diaphragm 1.
The pressure acting on the diaphragm 10 can be transmitted from the pressure transmitting medium 11 to the pressure receiving surface 2a of the pressure detecting element 2 while the pressure is blocked at zero. Thereby, the electric noise is cut off, and only the water pressure acts on the pressure receiving surface 2a of the pressure detecting element 2,
By preventing the capacitance from being affected by the electric noise, it is possible to eliminate the fluctuation of the sensor output due to the electric noise and detect the accurate water pressure.
【００１７】図２は、本発明の第２の実施の形態の静電
容量型投込圧力式水位計を示すものである。これは、例
えば絶縁材となるゴム製の薄板２０を圧力検出素子２の
受圧面２ａに貼り付け、該薄板２０で受圧面２ａを一体
に覆うノイズ遮断手段を構成したものである。その他の
構成は、前記第１の実施の形態と同様である。この実施
の形態によれば、該薄板２０で電気的ノイズを遮断し、
同時に、該薄板２０に作用する圧力を圧力検出素子２の
受圧面２ａに伝達することができる。これにより、電気
的ノイズの影響を受けることなく、正確な水圧を検出す
ることができる。FIG. 2 shows a capacitance type injection pressure type water level meter according to a second embodiment of the present invention. In this configuration, for example, a rubber thin plate 20 serving as an insulating material is attached to the pressure receiving surface 2a of the pressure detecting element 2, and the noise receiving means is configured to cover the pressure receiving surface 2a integrally with the thin plate 20. Other configurations are the same as those of the first embodiment. According to this embodiment, the thin plate 20 blocks electrical noise,
At the same time, the pressure acting on the thin plate 20 can be transmitted to the pressure receiving surface 2a of the pressure detecting element 2. Thus, accurate water pressure can be detected without being affected by electrical noise.
【００１８】図３は、本発明の第３の実施の形態の静電
容量型投込圧力式水位計を示すものである。これは、例
えばシリコングリースやテフロン材等をコーティング材
として使用し、これを圧力検出素子２の受圧面２ａに塗
布して絶縁材となるコーティング層３０を形成し、該コ
ーティング層３０で受圧面２ａを一体に覆うノイズ遮断
手段を構成したものである。その他の構成は、前記第１
の実施の形態と同様である。この実施の形態によれば、
該コーティング層３０で電気的ノイズを遮断し、同時
に、該コーティング層３０に作用する圧力を圧力検出素
子２の受圧面２ａに伝達することができる。これによ
り、電気的ノイズの影響を受けることなく、正確な水圧
を検出することができる。FIG. 3 shows a capacitance type injection pressure type water level meter according to a third embodiment of the present invention. In this method, for example, a coating material such as silicon grease or Teflon is used as a coating material, and the coating material is applied to the pressure receiving surface 2a of the pressure detecting element 2 to form a coating layer 30 serving as an insulating material. Is formed as a noise cutoff unit that integrally covers Other configurations are the same as those of the first embodiment.
This is the same as the embodiment. According to this embodiment,
The coating layer 30 blocks electrical noise, and at the same time, transmits pressure acting on the coating layer 30 to the pressure receiving surface 2 a of the pressure detecting element 2. Thus, accurate water pressure can be detected without being affected by electrical noise.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
例え水中ポンプのインバータ運転等による電気的ノイズ
が水中で発生しても、圧力検出素子の受圧面には、ノイ
ズ遮断手段で電気的ノイズが遮断され、水圧のみが作用
する。従って、受圧面が電気的ノイズに対してその静電
容量が影響を受けないようにして、電気的ノイズによる
センサ出力の変動をなくし、高精度に水位を検出するこ
とができる。しかも、セラミックス等の傷付き易い圧力
検出素子の受圧面を保護することができる。As described above, according to the present invention,
Even if electric noise is generated in the water due to the inverter operation of the submersible pump, the electric noise is cut off by the noise cutoff means on the pressure receiving surface of the pressure detecting element, and only the water pressure acts. Therefore, the capacitance of the pressure receiving surface is not affected by the electric noise, the fluctuation of the sensor output due to the electric noise is eliminated, and the water level can be detected with high accuracy. In addition, it is possible to protect the pressure receiving surface of the pressure detecting element such as ceramics which is easily damaged.
【図１】本発明の第１の実施の形態の静電容量型投込圧
力式水位計を示す一部切断の正面図である。FIG. 1 is a partially cutaway front view showing a capacitance type injection pressure type water level meter according to a first embodiment of the present invention.
【図２】本発明の第２の実施の形態の静電容量型投込圧
力式水位計を示す一部切断の正面図である。FIG. 2 is a partially cutaway front view showing a capacitance type injection pressure type water level meter according to a second embodiment of the present invention.
【図３】本発明の第３の実施の形態の静電容量型投込圧
力式水位計を示す一部切断の正面図である。FIG. 3 is a partially cutaway front view showing a capacitance type injection pressure type water level gauge according to a third embodiment of the present invention.
【図４】従来の静電容量型投込圧力式水位計を示す一部
切断の正面図である。FIG. 4 is a partially cutaway front view showing a conventional capacitance type injection pressure type water level meter.
１ ハウジング １ａ 開口部 ２ 圧力検出素子 ２ａ 受圧面 １０ ダイヤフラム １１ 圧力伝達媒体 １２ ノイズ遮断手段 ２０ 薄板（ノイズ遮断手段） ３０ コーティング層（ノイズ遮断手段） DESCRIPTION OF SYMBOLS 1 Housing 1a Opening 2 Pressure detecting element 2a Pressure receiving surface 10 Diaphragm 11 Pressure transmission medium 12 Noise cutoff means 20 Thin plate (noise cutoff means) 30 Coating layer (noise cutoff means)
Claims (3)
力を検出する圧力検出素子を備え、この圧力検出素子の
受圧面を樹脂等の絶縁材からなるハウジングの開口部に
配置した静電容量型投込圧力式水位計において、 前記圧力検出素子の受圧面は、前記ハウジングの開口部
の開口端を閉塞する絶縁材からなるダイヤフラムと、該
ダイヤフラムと圧力検出素子の受圧面との間に封入した
圧力伝達媒体とにより被覆されたことを特徴とする静電
容量型投込圧力式水位計。A pressure detecting element for detecting a pressure acting on a pressure receiving surface from a change in capacitance, wherein the pressure receiving surface of the pressure detecting element is disposed in an opening of a housing made of an insulating material such as a resin. In the capacitive injection pressure type water level meter, the pressure receiving surface of the pressure detecting element is a diaphragm made of an insulating material that closes an opening end of an opening of the housing, and between the diaphragm and the pressure receiving surface of the pressure detecting element. A capacitance type injection pressure type water level meter, characterized by being covered with an enclosed pressure transmission medium.
力を検出する圧力検出素子を備え、この圧力検出素子の
受圧面を樹脂等の絶縁材からなるハウジングの開口部に
配置した静電容量型投込圧力式水位計において、 前記圧力検出素子の受圧面には、絶縁材となるゴム製薄
板を貼り付けたことを特徴とする静電容量型投込圧力式
水位計。And a pressure detecting element for detecting a pressure acting on the pressure receiving surface from a change in capacitance, wherein the pressure receiving surface of the pressure detecting element is disposed in an opening of a housing made of an insulating material such as a resin. A capacitance type injection pressure type water level meter, wherein a rubber thin plate serving as an insulating material is attached to a pressure receiving surface of the pressure detection element.
力を検出する圧力検出素子を備え、この圧力検出素子の
受圧面を樹脂等の絶縁材からなるハウジングの開口部に
配置した静電容量型投込圧力式水位計において、 前記圧力検出素子の受圧面には、絶縁材となるコーティ
ング層を形成したことを特徴とする静電容量型投込圧力
式水位計。3. A static pressure sensor having a pressure detecting element for detecting a pressure acting on a pressure receiving surface from a change in capacitance, wherein the pressure receiving surface of the pressure detecting element is disposed in an opening of a housing made of an insulating material such as a resin. In the capacitive injection pressure type water gauge, a coating layer serving as an insulating material is formed on a pressure receiving surface of the pressure detection element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10270076A JP2000097748A (en) | 1998-09-24 | 1998-09-24 | Capacitance type immersion pressure water level gage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10270076A JP2000097748A (en) | 1998-09-24 | 1998-09-24 | Capacitance type immersion pressure water level gage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000097748A true JP2000097748A (en) | 2000-04-07 |
Family
ID=17481201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10270076A Pending JP2000097748A (en) | 1998-09-24 | 1998-09-24 | Capacitance type immersion pressure water level gage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000097748A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006170650A (en) * | 2004-12-13 | 2006-06-29 | Kawamoto Densan Kk | Pressure sensor and water level gauge of pressure type |
| WO2012133784A1 (en) * | 2011-03-31 | 2012-10-04 | 国立大学法人横浜国立大学 | Water absorption test method and water absorption test device for concrete surface |
| CN102778266A (en) * | 2012-07-02 | 2012-11-14 | 太原理工大学 | Water level redundancy measuring device |
| KR101264628B1 (en) | 2013-03-05 | 2013-05-24 | 명성효다계기 주식회사 | Manometer for preventing over press and shock |
| CN105973343A (en) * | 2016-06-23 | 2016-09-28 | 浙江大学 | Method for detecting dynamic material level in fluidized bed |
| CN112781781A (en) * | 2020-12-29 | 2021-05-11 | 浙江启尔机电技术有限公司 | Disturbance force measuring device of immersion control unit |
| CN113108863A (en) * | 2020-01-10 | 2021-07-13 | 横河电机株式会社 | Liquid level indicator with protective cover |
-
1998
- 1998-09-24 JP JP10270076A patent/JP2000097748A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006170650A (en) * | 2004-12-13 | 2006-06-29 | Kawamoto Densan Kk | Pressure sensor and water level gauge of pressure type |
| US9459192B2 (en) | 2011-03-31 | 2016-10-04 | National University Corporation Yokohama National University | Water absorption test method and water absorption test device for concrete surface |
| WO2012133784A1 (en) * | 2011-03-31 | 2012-10-04 | 国立大学法人横浜国立大学 | Water absorption test method and water absorption test device for concrete surface |
| JP5880981B2 (en) * | 2011-03-31 | 2016-03-09 | 国立大学法人横浜国立大学 | Water absorption test method and apparatus for concrete surface |
| CN102778266A (en) * | 2012-07-02 | 2012-11-14 | 太原理工大学 | Water level redundancy measuring device |
| KR101264628B1 (en) | 2013-03-05 | 2013-05-24 | 명성효다계기 주식회사 | Manometer for preventing over press and shock |
| CN105973343A (en) * | 2016-06-23 | 2016-09-28 | 浙江大学 | Method for detecting dynamic material level in fluidized bed |
| CN105973343B (en) * | 2016-06-23 | 2018-12-04 | 浙江大学 | The detection method of dynamic material level in a kind of fluidized bed |
| CN113108863A (en) * | 2020-01-10 | 2021-07-13 | 横河电机株式会社 | Liquid level indicator with protective cover |
| JP2021110634A (en) * | 2020-01-10 | 2021-08-02 | 横河電機株式会社 | Water gauge with protective cover |
| US11493376B2 (en) | 2020-01-10 | 2022-11-08 | Yokogawa Electric Corporation | Level indicator with protective cover |
| JP7192804B2 (en) | 2020-01-10 | 2022-12-20 | 横河電機株式会社 | Water level gauge with protective cover |
| CN113108863B (en) * | 2020-01-10 | 2024-06-07 | 横河电机株式会社 | Liquid level indicator with protective cover |
| CN112781781A (en) * | 2020-12-29 | 2021-05-11 | 浙江启尔机电技术有限公司 | Disturbance force measuring device of immersion control unit |
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