JP2002340652A - Immersion type liquid level transmitter, and pressure detector - Google Patents
Immersion type liquid level transmitter, and pressure detectorInfo
- Publication number
- JP2002340652A JP2002340652A JP2001151919A JP2001151919A JP2002340652A JP 2002340652 A JP2002340652 A JP 2002340652A JP 2001151919 A JP2001151919 A JP 2001151919A JP 2001151919 A JP2001151919 A JP 2001151919A JP 2002340652 A JP2002340652 A JP 2002340652A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- liquid level
- receiving diaphragm
- pressure receiving
- detector
- 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、液中へ沈めて液位
を測定する投込式液位伝送器、圧力検出器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a immersion type liquid level transmitter and a pressure detector for measuring a liquid level by immersing the liquid in a liquid.
【０００２】[0002]
【従来の技術】従来、液中に沈めて液位を測定する投込
式液位伝送器の検出器について、例えば図５を参照して
説明すると、受圧ダイアフラム１は、例えばステンレス
から成り、検出器先端であって、後述する測定液の液面
に対して水平方向で下向き（底面側）に配置され、受圧
ダイアフラム１で受けた圧力は封入液（例えば、シリコ
ンオイル）２を介して上向きに圧力センサ３へ伝達され
る。圧力センサ３に伝達された圧力は、信号増幅変換部
４で電気信号に変換され、地上側の大気圧を検出器自体
へ導く中空ケーブル５を介して電気信号が地上側へ伝送
される。このような投込式液位伝送器において、圧力セ
ンサ３は封入液２を介して伝達された受圧ダイアフラム
１で受けた圧力の変化に基づいて液位の変化を測定し、
これを信号増幅変換部４で電気信号に変換し地上側へ伝
送を行っていた。しかしながら、この投込式液位伝送器
では、検出器自体を液中に沈める際、受圧ダイアフラム
１が測定液の液面に対して水平方向で下向きに配置され
ているため、受圧ダイアフラム部１の空気が十分に抜け
きれず、受圧ダイアフラム１の作用面に空気溜りが生じ
る。このため、空気溜りが影響して液位を正確に測定す
ることができない間題があった。2. Description of the Related Art Conventionally, a detector of a immersion type liquid level transmitter for measuring a liquid level by immersing in a liquid will be described with reference to FIG. 5, for example. The pressure is received by the pressure receiving diaphragm 1 upward through the sealed liquid (for example, silicone oil) 2 at the tip of the vessel, which is disposed horizontally downward (bottom side) with respect to the liquid surface of the measuring liquid described later. It is transmitted to the pressure sensor 3. The pressure transmitted to the pressure sensor 3 is converted into an electric signal by the signal amplification conversion unit 4, and the electric signal is transmitted to the ground via a hollow cable 5 for guiding the atmospheric pressure on the ground to the detector itself. In such an injection type liquid level transmitter, the pressure sensor 3 measures a change in liquid level based on a change in pressure received by the pressure receiving diaphragm 1 transmitted through the sealed liquid 2,
This was converted into an electric signal by the signal amplification conversion unit 4 and transmitted to the ground side. However, in this immersion type liquid level transmitter, when the detector itself is immersed in the liquid, the pressure receiving diaphragm 1 is disposed downward in the horizontal direction with respect to the liquid surface of the measurement liquid. The air cannot be sufficiently removed, and an air pool is generated on the working surface of the pressure receiving diaphragm 1. For this reason, there was a problem that the liquid level could not be measured accurately due to the influence of the air pool.
【０００３】このことを解決するため、例えば受圧ダイ
アフラムを測定液の液面に対して垂直方向に配置した投
込式液位伝送器が、特開２０００−１４６６７１公報に
開示されている。より詳細には、図６及び図７に示す通
り、検出器先端に設けられる圧力検知部６は、先端の厚
みを残して測定液の液面に対して垂直方向に配置される
受圧ダイアフラム１Ａと、受圧ダイアフラム１Ａの内側
に充填封入され、受圧ダイアフラム１Ａにかかる圧力を
圧力センサ３に伝達する封入液２とで構成される。この
ような投込式液位伝送器において、検出器自体を液中に
沈める際、空気は受圧ダイアフラム１Ａの垂直なダイア
フラム面に沿って上方へ抜けていくため、空気溜りは起
こらない。In order to solve this problem, Japanese Patent Laid-Open Publication No. 2000-146671 discloses, for example, a immersion type liquid level transmitter in which a pressure receiving diaphragm is arranged in a direction perpendicular to the liquid level of a measuring liquid. More specifically, as shown in FIGS. 6 and 7, the pressure detecting section 6 provided at the detector tip includes a pressure-receiving diaphragm 1A that is arranged in a direction perpendicular to the liquid level of the measurement liquid while leaving the thickness of the tip. , Which is filled and sealed inside the pressure receiving diaphragm 1A, and transmits the pressure applied to the pressure receiving diaphragm 1A to the pressure sensor 3. In such an immersion type liquid level transmitter, when the detector itself is immersed in the liquid, the air flows upward along the vertical diaphragm surface of the pressure receiving diaphragm 1A, so that no air pool occurs.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、特開２
０００−１４６６７１公報に開示されている投込式液位
伝送器では、例えば検出器先端にねじ部を設け、このね
じ部に対して圧力検知部６を取り囲む保護カバーを備え
た場合、保護カバーの目詰まり等で空気溜りが生じてし
まい、この残留空気が受圧ダイアフラムの上部に接触す
ることから液位を正確に測定することができない間題が
あった。また、残留空気により酸素の濃淡電池が形成さ
れてダイアフラムに腐食が発生する問題があった。本発
明は、上記間題点を解決する為になされたもので、受圧
ダイアフラム部に空気溜りが生じることを防ぎ、液位、
圧力を正確に測定することができる投込式液位伝送器、
圧力検出器を提供することを目的とする。SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open
In the liquid level transmitter disclosed in Japanese Patent Application Publication No. 000-146671, for example, when a screw portion is provided at the tip of the detector and a protective cover surrounding the pressure detecting portion 6 is provided for the screw portion, An air pocket is generated due to clogging or the like, and there is a problem that the liquid level cannot be measured accurately because the residual air contacts the upper part of the pressure receiving diaphragm. Further, there is a problem that a concentration cell of oxygen is formed by the residual air and corrosion occurs in the diaphragm. The present invention has been made in order to solve the above problems, and prevents the occurrence of air accumulation in the pressure-receiving diaphragm portion,
Immersion type liquid level transmitter that can measure pressure accurately,
It is an object to provide a pressure detector.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に請求項１に係る発明は、先端に設けられる受圧ダイア
フラムと、受圧ダイアフラムにかかる圧力を検出して液
位を測定するセンサとを有する検出器を備えた投込式液
位伝送器において、受圧ダイアフラムは検出器の落下方
向に対して上向きに配置され、受圧ダイアフラムで受け
た下向きに作用する圧力をセンサヘ伝達する導圧手段を
備えたことを特徴とする。このような構成において、検
出器先端に設けられる受圧ダイアフラムは検出器の落下
方向に対して上向きに配置されることから、受圧ダイア
フラム部での空気溜りを十分に防ぐことができ、液位を
正確に測定することができる。また、請求項２に係る発
明は、落下方向に対して上向きに配置される受圧ダイア
フラムと、受圧ダイアフラムにかかる圧力を検出して液
位を測定するセンサと、受圧ダイアフラムで受けた下向
きに作用する圧力をセンサヘ伝達する導圧手段とを備え
たことを特徴とする。このような構成において、受圧ダ
イアフラムは落下方向に対して上向きに配置されること
から、受圧ダイアフラム部での空気溜りを十分に防ぐこ
とができ、圧力を正確に検出することができる。According to a first aspect of the present invention, there is provided a pressure receiving diaphragm provided at a distal end, and a sensor for detecting a pressure applied to the pressure receiving diaphragm to measure a liquid level. In the immersion type liquid level transmitter equipped with a detector, the pressure receiving diaphragm is arranged upward with respect to the falling direction of the detector, and is provided with pressure guiding means for transmitting the downward acting pressure received by the pressure receiving diaphragm to the sensor. It is characterized by the following. In such a configuration, the pressure receiving diaphragm provided at the tip of the detector is arranged upward with respect to the falling direction of the detector, so that air accumulation at the pressure receiving diaphragm can be sufficiently prevented, and the liquid level can be accurately measured. Can be measured. According to a second aspect of the present invention, a pressure-receiving diaphragm disposed upward with respect to a drop direction, a sensor for detecting a pressure applied to the pressure-receiving diaphragm to measure a liquid level, and a downward action received by the pressure-receiving diaphragm. Pressure transmitting means for transmitting pressure to the sensor. In such a configuration, since the pressure receiving diaphragm is arranged upward with respect to the falling direction, it is possible to sufficiently prevent air from being trapped in the pressure receiving diaphragm portion, and to accurately detect the pressure.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を参照しながら説明する。図１は本発明に係る
投込式液位伝送器の第一の実施形態の検出器を示す図で
あって、（ａ）は概要断面図、（ｂ）は要部外観図であ
る。同図において、受圧ダイアフラム７は、（ｂ）に示
すように検出器９の先端に設けられ、検出器９の落下方
向に対して上向き、換言すれば後述する測定液の液面に
対して水平方向で上向き（底面とは反対側）に配置され
る。受圧ダイアフラム７で受けた下向きに作用する圧力
は、受圧ダイアフラム７の下側に位置する封入液２Ａを
介し導圧路８を通じて受圧ダイアフラム７の上側に位置
する圧力センサ３Ａへ伝達される。圧力センサ３Ａに伝
達された圧力は、信号増幅変換部４Ａで電気信号に変換
され、地上側の大気圧を検出器９自体へ導く中空ケーブ
ル５Ａを介して電気信号が地上側へ伝送される。このよ
うな検出器９を備えた投込式液位伝送器を使用する場
合、図２に示すように、検出器９は重錘スタンド１０に
より底面に固定され、中継ハウジング１１から中空ケー
ブル５Ａを介して検出器９に電源が供給されることで使
用できるようになる。こうして、検出器９において、先
端に位置し測定液の液面１２に対して水平方向で上向き
に配置された受圧ダイアフラム７で受けた圧力に基づい
て液位の変化を測定し、これを電気信号に変換して中空
ケーブル５Ａを介し地上側へ伝送する。Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are diagrams showing a detector of a first embodiment of an injection type liquid level transmitter according to the present invention, wherein FIG. 1A is a schematic sectional view, and FIG. In the figure, the pressure receiving diaphragm 7 is provided at the tip of the detector 9 as shown in FIG. It is arranged upward in the direction (the side opposite to the bottom surface). The downwardly acting pressure received by the pressure receiving diaphragm 7 is transmitted to the pressure sensor 3A located above the pressure receiving diaphragm 7 through the pressure introducing path 8 via the filling liquid 2A located below the pressure receiving diaphragm 7. The pressure transmitted to the pressure sensor 3A is converted into an electric signal by the signal amplification conversion unit 4A, and the electric signal is transmitted to the ground via a hollow cable 5A that guides the atmospheric pressure on the ground to the detector 9 itself. In the case of using an injection type liquid level transmitter equipped with such a detector 9, the detector 9 is fixed to the bottom surface by a weight stand 10 as shown in FIG. The power can be supplied to the detector 9 via the detector 9 so that the detector 9 can be used. In this way, the detector 9 measures a change in the liquid level based on the pressure received by the pressure-receiving diaphragm 7 which is located at the tip and is disposed horizontally upward with respect to the liquid surface 12 of the measurement liquid, and this is measured by an electric signal. And transmitted to the ground via the hollow cable 5A.
【０００７】本実施の形態によれば、検出器９の先端に
位置する受圧ダイアフラム７は検出器９の落下方向に対
して上向き、換言すれば測定液の液面１２に対して水平
方向で上向きに配置されることから、検出器９を液中に
沈める際、空気は上方に抜け受圧ダイアフラム部７の空
気溜りを防ぐことができるので、液位を正確に測定する
ことができる。また、受圧ダイアフラム７は測定液の液
面１２に対して水平方向で上向きにしたことで底面と接
触することがなくなることから受圧ダイアフラム７の強
度を考慮する必要性が低減され、従来と比較して検出器
９の先端をより底面に近づけることができるので、測定
不可距離（不感帯）を縮小することができる。次に、本
発明に係る投込式液位伝送器の第二の実施形態につい
て、図３を参照しながら説明する。同図において、
（ａ）は概要断面図、（ｂ）は要部外観図であるが、上
述した第一の実施形態で受圧ダイアフラムの端部に導圧
路を設けた代わりに、本実施形態の投込式液位伝送器の
検出器９では、受圧ダイアフラム７の中央部に導圧路１
３を設け、受圧ダイアフラム７で受けた下向きに作用す
る圧力をその下側に位置する封入液２Ａを介し導圧路１
３を通じて受圧ダイアフラム７の上側に位置する圧力セ
ンサ３Ａへ伝達するようにしている。According to the present embodiment, the pressure receiving diaphragm 7 located at the tip of the detector 9 faces upward with respect to the falling direction of the detector 9, in other words, faces upward in the horizontal direction with respect to the liquid level 12 of the measuring liquid. When the detector 9 is submerged in the liquid, the air can escape upward to prevent the air from being trapped in the pressure-receiving diaphragm section 7, so that the liquid level can be measured accurately. Further, since the pressure receiving diaphragm 7 is oriented upward in the horizontal direction with respect to the liquid surface 12 of the measurement liquid, there is no need to consider the strength of the pressure receiving diaphragm 7 because the pressure receiving diaphragm 7 does not contact the bottom surface. As a result, the tip of the detector 9 can be brought closer to the bottom surface, so that the unmeasurable distance (dead zone) can be reduced. Next, a second embodiment of the injection type liquid level transmitter according to the present invention will be described with reference to FIG. In the figure,
(A) is a schematic sectional view, and (b) is an external view of a main part. Instead of providing a pressure guide path at the end of the pressure receiving diaphragm in the first embodiment described above, the injection type of this embodiment is used. In the detector 9 of the liquid level transmitter, the pressure guiding passage 1 is provided at the center of the pressure receiving diaphragm 7.
3, and the downwardly acting pressure received by the pressure receiving diaphragm 7 is applied to the pressure guiding path 1
3, the pressure is transmitted to a pressure sensor 3A located above the pressure receiving diaphragm 7.
【０００８】このような構成によれば、上述した第一の
実施形態と同様に、受圧ダイアフラム部７の空気溜りを
防ぎ液位を正確に測定することができる。また、受圧ダ
イアフラム７の中央部に導圧路１３を設けるようにした
ので、端部に導圧路を設けた第一の実施形態の受圧ダイ
アフラムよりも径を大きくすることができる。すなわ
ち、受圧ダイアフラムの径が大きいと、それだけ柔軟性
を保つことができることから感度よく圧力を受けること
ができ、液位をより正確に測定することが可能となる。
次に、本発明に係る投込式液位伝送器の第三の実施形態
について、図４を参照しながら説明する。同図におい
て、（ａ）は要部外観図、（ｂ）は保護カバーの正面
図、（ｃ）は保護カバーの底面図であるが、上述した第
一の実施形態や第二の実施形態における受圧ダイアフラ
ム部７に、圧力を伝えるべく空気抜き孔又は空気や測定
媒体を透す構造であって、交換作業性やメンテナンス性
を改善するため着脱自在とした保護カバー１４、１５を
設ける。保護カバー１４、１５は、例えば焼結全属材料
から成り、一方には凸状の突起部１６を設け、他方に凹
状の窪み部１７を設け、両者は嵌合されてリング状に形
成されるものであって、左右から導圧路を挟むようにし
て取り付けられる。According to such a configuration, similarly to the above-described first embodiment, it is possible to prevent air from remaining in the pressure receiving diaphragm 7 and accurately measure the liquid level. Further, since the pressure-guiding path 13 is provided at the center of the pressure-receiving diaphragm 7, the diameter can be made larger than that of the pressure-receiving diaphragm of the first embodiment in which the pressure-guiding path is provided at the end. In other words, if the diameter of the pressure receiving diaphragm is large, the flexibility can be maintained, so that pressure can be received with high sensitivity, and the liquid level can be measured more accurately.
Next, a third embodiment of the injection type liquid level transmitter according to the present invention will be described with reference to FIG. In the same figure, (a) is an external view of a main part, (b) is a front view of a protective cover, and (c) is a bottom view of the protective cover. In the first and second embodiments described above, FIG. The pressure-receiving diaphragm section 7 is provided with protective covers 14 and 15 which have an air vent hole or a structure through which air or a measurement medium is transmitted to transmit pressure, and which are detachable to improve exchange workability and maintainability. The protective covers 14 and 15 are made of, for example, a material of all sintering grades. One is provided with a convex projection 16 and the other is provided with a concave depression 17, and both are fitted to form a ring. It is attached so as to sandwich the pressure guiding passage from the left and right.
【０００９】このような保護カバーを設けた検出器９で
あれば、取り付け時やメンテナンス時の取扱いミスや異
物等の衝突等による受圧ダイアフラム７の損傷を防ぐこ
とができる。一方、従来懸念されていた保護カバーの目
詰まり等で内部に空気が残ることによって受圧ダイアフ
ラムの上部に残留空気が接触していたことについては、
本発明の実施形態による受圧ダイアフラム７を検出器９
の落下方向に対して上向き、換言すれば測定液の液面１
２に対して水平方向で上向きに配置したことにより、残
留空気が受圧ダイアフラム７に接触する可能性をなくす
ことができ、保護カバー１４、１５が設けられた検出器
９における液位の測定精度が大幅に改善される。なお、
本実施形態では、保護カバー１４、１５の材質を焼結金
属材料としたが、これに限定されるものではなく、例え
ば複数の孔を有するプラスチック材料やセラミック材料
としても良い。The detector 9 provided with such a protective cover can prevent the pressure receiving diaphragm 7 from being damaged due to mishandling at the time of mounting or maintenance or collision of foreign matter. On the other hand, regarding the fact that residual air was in contact with the upper part of the pressure receiving diaphragm due to air remaining inside due to clogging of the protective cover, etc.
The pressure receiving diaphragm 7 according to the embodiment of the present invention is
Upward, in other words, the liquid level 1 of the measurement liquid.
By arranging it upward in the horizontal direction with respect to 2, the possibility that residual air contacts the pressure receiving diaphragm 7 can be eliminated, and the measurement accuracy of the liquid level in the detector 9 provided with the protective covers 14 and 15 can be improved. It is greatly improved. In addition,
In the present embodiment, the material of the protective covers 14 and 15 is a sintered metal material. However, the material is not limited to this. For example, a plastic material or a ceramic material having a plurality of holes may be used.
【００１０】[0010]
【発明の効果】以上のように本発明によれば、検出器先
端の受圧ダイアフラムを検出器の落下方向に対して上向
きに配置し、受圧ダイアフラムで受けた下向きに作用す
る圧力を導圧手段でセンサヘ伝達するようにしたので、
受圧ダイアフラム部に空気溜りが生じることを防ぎ、液
位を正確に測定することができる。また、落下方向に対
して上向きに配置された受圧ダイアフラムで受けた下向
きに作用する圧力を導圧手段でセンサヘ伝達するように
したので、受圧ダイアフラム部に空気溜りが生じること
を防ぎ、圧力を正確に検出することができる。As described above, according to the present invention, the pressure receiving diaphragm at the tip of the detector is arranged upward with respect to the falling direction of the detector, and the downwardly acting pressure received by the pressure receiving diaphragm is applied by the pressure guiding means. Since it was transmitted to the sensor,
The occurrence of air pockets in the pressure-receiving diaphragm can be prevented, and the liquid level can be accurately measured. In addition, the pressure acting downward received by the pressure receiving diaphragm arranged upward with respect to the falling direction is transmitted to the sensor by the pressure guiding means, so that air accumulation is prevented from occurring in the pressure receiving diaphragm part, and the pressure can be accurately adjusted. Can be detected.
【図１】 本発明に係る投込式液位伝送器の第一の実施
形態の検出器であって、（ａ）は概要断面図、（ｂ）は
要部外観図。FIG. 1 is a detector according to a first embodiment of an immersion type liquid level transmitter according to the present invention, wherein (a) is a schematic sectional view and (b) is an external view of a main part.
【図２】 投込式液位伝送器の使用状態を示した全体の
説明図。FIG. 2 is an overall explanatory diagram showing a use state of the injection type liquid level transmitter.
【図３】 本発明に係る投込式液位伝送器の第二の実施
形態の検出器であって、（ａ）は概要断面図、（ｂ）は
要部外観図。FIG. 3 is a detector according to a second embodiment of the immersion type liquid level transmitter according to the present invention, wherein (a) is a schematic sectional view and (b) is an external view of a main part.
【図４】 本発明に係る投込式液位伝送器の第三の実施
形態の検出器であって、（ａ）は保護カバーが取り付け
られた概要断面図、（ｂ）は保護カバーの正面図、
（ｃ）は保護カバーの底面図。FIG. 4 is a detector according to a third embodiment of the immersion type liquid level transmitter according to the present invention, wherein (a) is a schematic sectional view in which a protective cover is attached, and (b) is a front view of the protective cover. Figure,
(C) is a bottom view of the protective cover.
【図５】 従来の投込式液位伝送器の検出器の概要断面
図。FIG. 5 is a schematic sectional view of a detector of a conventional immersion type liquid level transmitter.
【図６】 従来の他の投込式液位伝送器の検出器の概要
断面図。FIG. 6 is a schematic sectional view of a detector of another conventional injection type liquid level transmitter.
【図７】 従来の他の投込式液位伝送器の検出器の概要
斜視図。FIG. 7 is a schematic perspective view of a detector of another conventional injection type liquid level transmitter.
【符号の説明】 ２Ａ…封入液、３Ａ…圧力センサ、４Ａ…信号増幅変換
部、７…受圧ダイアフラム８、１３…導圧路、１４、１
５…保護カバー[Explanation of Symbols] 2A: Filled liquid, 3A: Pressure sensor, 4A: Signal amplification conversion unit, 7: Pressure receiving diaphragm 8, 13, ... Pressure guide path, 14, 1
5 ... Protective cover
Claims (2)
前記受圧ダイアフラムにかかる圧力を検出して液位を測
定するセンサとを有する検出器を備えた投込式液位伝送
器において、前記受圧ダイアフラムは検出器の落下方向
に対して上向きに配置され、前記受圧ダイアフラムで受
けた下向きに作用する圧力を前記センサヘ伝達する導圧
手段を備えたことを特徴とする投込式液位伝送器。1. A pressure receiving diaphragm provided at a tip end,
In a immersion type liquid level transmitter having a sensor having a sensor for detecting a pressure applied to the pressure receiving diaphragm and measuring a liquid level, the pressure receiving diaphragm is arranged upward with respect to a falling direction of the detector, An injection type liquid level transmitter, comprising: a pressure guiding means for transmitting a downwardly acting pressure received by the pressure receiving diaphragm to the sensor.
圧ダイアフラムと、前記受圧ダイアフラムにかかる圧力
を検出して液位を測定するセンサと、前記受圧ダイアフ
ラムで受けた下向きに作用する圧力を前記センサヘ伝達
する導圧手段とを備える圧力検出器。2. A pressure receiving diaphragm arranged upward with respect to a falling direction, a sensor for detecting a pressure applied to the pressure receiving diaphragm to measure a liquid level, and a pressure acting downward received by the pressure receiving diaphragm. Pressure-guiding means for transmitting to a sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001151919A JP2002340652A (en) | 2001-05-22 | 2001-05-22 | Immersion type liquid level transmitter, and pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001151919A JP2002340652A (en) | 2001-05-22 | 2001-05-22 | Immersion type liquid level transmitter, and pressure detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002340652A true JP2002340652A (en) | 2002-11-27 |
Family
ID=18996670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001151919A Pending JP2002340652A (en) | 2001-05-22 | 2001-05-22 | Immersion type liquid level transmitter, and pressure detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002340652A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013083494A (en) * | 2011-10-07 | 2013-05-09 | Musashino Kiki Kk | Liquid level gauge |
| JP2016128756A (en) * | 2015-01-09 | 2016-07-14 | 中国電力株式会社 | Protection tool of throw-in type water gauge |
-
2001
- 2001-05-22 JP JP2001151919A patent/JP2002340652A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013083494A (en) * | 2011-10-07 | 2013-05-09 | Musashino Kiki Kk | Liquid level gauge |
| JP2016128756A (en) * | 2015-01-09 | 2016-07-14 | 中国電力株式会社 | Protection tool of throw-in type water gauge |
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