JP3348006B2 - Fluid detection sensor - Google Patents
Fluid detection sensorInfo
- Publication number
- JP3348006B2 JP3348006B2 JP03268998A JP3268998A JP3348006B2 JP 3348006 B2 JP3348006 B2 JP 3348006B2 JP 03268998 A JP03268998 A JP 03268998A JP 3268998 A JP3268998 A JP 3268998A JP 3348006 B2 JP3348006 B2 JP 3348006B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- detection
- housing
- detection sensor
- fluid
- 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 - Fee Related
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Geophysics And Detection Of Objects (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、絶縁性の管路を通
じて移送される、液体、気体、粉体又はそれらの混合物
などの流体の有無、構成や状態の変化などを検知する流
体検知センサに関するものであり、さらに詳しくは静電
容量形近接センサを用い、しかも小さいスペースにも設
置可能な流体検知センサに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid detection sensor for detecting the presence or absence of a fluid such as a liquid, a gas, a powder, or a mixture thereof, a change in a configuration or a state of the fluid, and the like. More specifically, the present invention relates to a fluid detection sensor that uses a capacitance type proximity sensor and can be installed in a small space.
【０００２】[0002]
【従来の技術】流体の移送手段を有する機器、例えば飲
料などの液体の自動販売機やディスペンサにおいて管路
内を通過する飲料が無くなり、又は変化したときにそれ
を検知して利用者や管理者のために表示、警報、自動停
止などを行う必要が生じる。従来、このように管路を通
じて移送される流体の有無、構成や状態の変化などを検
知する手段として、静電容量形近接センサがよく用いら
れている。図７は、従来の静電容量形近接センサ８０を
示す模式図で、管路Ｐの近くに静電容量形近接センサ８
０を設置して、その検知電極８１と大地間の静電容量の
変化を検知するようにしたものである。この静電容量形
近接センサ８０は、検知電極８１と検知回路８２と筐体
８３などを備えており、必要に応じて、感度調整用のポ
テンショメータＭ、動作表示ランプＬ、検知回路８２の
出力信号を所定の制御機器等に伝送するリード線ｗなど
を設けたものである。この静電容量形近接センサ８０
は、イ、その検知電極が電気的に露出しているため、外
部からの影響を受けやすく、センサ付近に配線や他の近
接スイッチなどがあるとその影響を受けて正確な検出が
できなくなり、センサ付近にデッドスペースを設ける必
要があり、また周辺に構造物があると、それと検知電極
との距離によって対大地静電容量のレベルが変わるの
で、それを一定に保つため、取り付け作業に熟練を必要
とする、ロ、さらに、検知電極と検知回路とが長手方向
に細長状に配列され、しかも管路に対して垂直方向に配
列されているので、管路周辺に大きいスペースを必要と
する、という問題があった。2. Description of the Related Art In a device having a means for transferring a fluid, for example, a vending machine or a dispenser for liquid such as a beverage, when the beverage passing through the pipeline is lost or changed, the beverage is detected and the user or manager is detected. Display, alarm, automatic stop, etc. need to be performed. Conventionally, a capacitance type proximity sensor is often used as a means for detecting the presence / absence of a fluid transferred through a pipeline, a change in the configuration or state, and the like. FIG. 7 is a schematic diagram showing a conventional capacitance type proximity sensor 80.
0 is provided to detect a change in capacitance between the detection electrode 81 and the ground. The capacitance type proximity sensor 80 includes a detection electrode 81, a detection circuit 82, a housing 83, and the like. If necessary, a potentiometer M for sensitivity adjustment, an operation display lamp L, and an output signal of the detection circuit 82 are provided. And a lead wire w for transmitting the data to a predetermined control device or the like. This capacitance type proximity sensor 80
A) Because the sensing electrode is electrically exposed, it is susceptible to external influences, and if there is a wiring or other proximity switch near the sensor, it will not be able to perform accurate detection due to the influence. It is necessary to provide a dead space near the sensor, and if there is a structure around the sensor, the level of the capacitance to ground changes depending on the distance between the sensor and the sensing electrode. Required, b, furthermore, since the detection electrodes and the detection circuits are arranged in a slender shape in the longitudinal direction and are arranged in a direction perpendicular to the pipeline, a large space is required around the pipeline, There was a problem.
【０００３】そこで、外径の異なる同心状の円筒形導体
を配置し、内部の円筒形導体を検知電極、外部の円筒形
導体をガード電極とするセンサヘッドと、検知回路を分
離し、同軸コードで接続することにより、管路に検出電
極を有するセンサヘッドを挿入して取り付け、省スペー
スを図った分離形静電容量形近接センサからなる液体検
出装置が提案されている（特開平７−２８０６２４号参
照）。このようにすれば、ガード電極があるので外部の
影響は遮断され、しかも管路周辺にはセンサヘッドだけ
を設けるので管路周辺に大きいスペースを設ける必要は
ないので、上記イ及びロの問題は解決される。しかし、 センサヘッドの取り付け、取り外し作業が面倒であ
り、 センサヘッドと検知回路のほかに両者を接続する同
軸コードが必要となり、これを配線するなどの手間がか
かり、しかも同軸コードの付加容量をキャンセルするた
め補償回路が必要となり高価になるという問題がある。Therefore, a sensor head having concentric cylindrical conductors having different outer diameters, the inner cylindrical conductor as a detection electrode, and the outer cylindrical conductor as a guard electrode, and a detection circuit are separated to form a coaxial cable. A liquid detecting device comprising a separated capacitance type proximity sensor which saves space by inserting and attaching a sensor head having a detecting electrode to a conduit by connecting with a pipe has been proposed (JP-A-7-280624). No.). In this way, since there is a guard electrode, the external influence is cut off, and since only the sensor head is provided around the pipeline, there is no need to provide a large space around the pipeline. Will be resolved. However, attaching and detaching the sensor head is troublesome, requiring a coaxial cable to connect the sensor head and the detection circuit in addition to the sensor head, which requires labor such as wiring, and cancels the additional capacity of the coaxial cable. Therefore, there is a problem that a compensation circuit is required and the cost becomes high.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、このような
問題を解決するためになされたもので、請求項１乃至請
求項８の発明は、電極部と検出回路部を分離することな
く、小型で、取り付け、取り外し作業が容易であり、し
かも外部からの影響を受けることのない流体検知センサ
を安価に提供することを課題とする。SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and the inventions of claims 1 to 8 have been made without separating the electrode section and the detection circuit section. An object of the present invention is to provide a fluid detection sensor that is small in size, easy to attach and detach, and free from external influences.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するた
め、請求項１記載の流体検知センサは、検知電極と前記
検知電極の対大地静電容量を検知する検知回路と前記検
知電極への外部の影響を遮断するガード電極とそれらを
収納する筐体とを有し、管路内の流体の変化を検知する
流体検知センサにおいて、前記筐体は、管路を挟んで着
脱容易な第１及び第２の細長の筐体からなり、前記検知
電極は第１の筐体に、前記ガード電極は第２の筐体にそ
れぞれ収納され、前記第１の筐体と前記第２の筐体とを
結合手段により前記管路を挟んで結合したとき、前記検
知電極と前記ガード電極が前記管路を介して対向し、前
記ガード電極が前記検知電極に対する外部の影響を遮断
するように配設され、前記検知回路は前記第１又は第２
の筐体に、検知電極又はガード電極とともに長手方向を
一致させて層状に配設してなることを特徴とする。According to a first aspect of the present invention, there is provided a fluid detection sensor for detecting a detection electrode, a detection circuit for detecting a capacitance of the detection electrode with respect to the ground, and an external connection to the detection electrode. In a fluid detection sensor for detecting a change in fluid in a pipeline having a guard electrode for blocking the influence of the above and a housing for accommodating them, the housing has first and second attachment / detachments that are easy to attach / detach across the pipeline. The detection electrode is housed in the first housing, and the guard electrode is housed in the second housing. The first housing and the second housing are connected to each other. When coupled via the conduit by the coupling means, the detection electrode and the guard electrode are opposed via the conduit, and the guard electrode is disposed so as to block external influence on the detection electrode, The detection circuit is configured to detect the first or second
Are arranged in layers with the detection electrodes or the guard electrodes in the same longitudinal direction.
【０００６】請求項２記載の発明は、請求項１記載の流
体検知センサにおいて、前記検知回路は、前記検知電極
に接続されてその対大地静電容量の変化により発振周波
数が変化する発振回路と、この発振回路の出力信号から
前記対大地静電容量の変化を判定する判定回路とを有
し、前記ガード電極は、前記発振回路の出力部に接続し
てなることを特徴とする。According to a second aspect of the present invention, in the fluid detection sensor according to the first aspect, the detecting circuit is connected to the detecting electrode and has an oscillation frequency that changes according to a change in its capacitance to ground. A determination circuit for determining a change in the electrostatic capacitance to ground from an output signal of the oscillation circuit, wherein the guard electrode is connected to an output section of the oscillation circuit.
【０００７】請求項３記載の発明は、請求項１又は２記
載の流体検知センサにおいて、前記検知電極は、ほぼ矩
形状の導電性平板又はそれを管路の形状に対応するよう
湾曲させた導電性板からなり、前記ガード電極は、ほぼ
矩形状の導電性板を開口側の幅が前記検知電極の幅より
広い断面ほぼコの字形に形成してなり、前記検知電極の
少なくとも両側端部が前記ガード電極の開口端面内に入
るように配設してなることを特徴とする。According to a third aspect of the present invention, in the fluid detection sensor according to the first or second aspect, the detection electrode is a substantially rectangular conductive flat plate or a conductive plate curved so as to correspond to the shape of a conduit. The guard electrode is formed by forming a substantially rectangular conductive plate into a substantially U-shaped cross section having a width on the opening side larger than the width of the detection electrode, and at least both side ends of the detection electrode are formed. The guard electrode is disposed so as to enter the opening end face of the guard electrode.
【０００８】請求項４記載の発明は、請求項３記載の流
体検知センサにおいて、前記第１及び第２の筐体は、矩
形柱状をなし、その対向面側の幅方向中央には管路の貫
通部を、その両側には溝部をそれぞれ有し、前記第２の
筐体の両側の溝部にはスリットを設けてなり、前記第１
の筐体の前記管路貫通部には検知電極を、前記第２の筐
体には、前記断面コの字形のガード電極の両側面を前記
スリットに嵌め込み、前記第１及び第２の筐体を結合し
たとき、前記検知電極と前記ガード電極が対向するよう
に配設してなることを特徴とする。According to a fourth aspect of the present invention, in the fluid detection sensor according to the third aspect, the first and second housings have a rectangular column shape, and a conduit is provided at the center in the width direction on the opposing surface side. The penetrating portion has grooves on both sides thereof, and slits are provided on the grooves on both sides of the second housing.
A detection electrode is fitted in the conduit penetrating portion of the housing, and both sides of the guard electrode having a U-shaped cross section are fitted in the slit in the second housing, and the first and second housings are fitted. When the detection electrodes are coupled, the detection electrode and the guard electrode are disposed so as to face each other.
【０００９】請求項５記載の発明は、請求項４記載の流
体検知センサにおいて、第１及び第２の筐体の長手方向
両端部の溝側に両筐体を結合するボルト等の取り付け手
段を貫通する貫通孔を有することを特徴とする。According to a fifth aspect of the present invention, in the fluid detection sensor according to the fourth aspect, a mounting means such as a bolt for connecting the first and second housings to the groove sides at both ends in the longitudinal direction is provided. It is characterized by having a penetrating hole.
【００１０】請求項６記載の発明は、請求項４又は５に
記載の流体検知センサにおいて、前記検知回路は、前記
検知電極とともに前記第１の筐体に収納されることを特
徴とする。According to a sixth aspect of the present invention, in the fluid detection sensor according to the fourth or fifth aspect, the detection circuit is housed in the first housing together with the detection electrode.
【００１１】請求項７記載の発明は、請求項６記載の流
体検知センサにおいて、前記第１の筐体は、検知電極配
設部と、検知回路配設部とを有し、両者の仕切る中板に
設けた接続孔を介して前記検知電極の一端と前記発振回
路の入力部とを接続してなることを特徴とする。According to a seventh aspect of the present invention, in the fluid detection sensor according to the sixth aspect, the first housing has a detection electrode disposition portion and a detection circuit disposition portion, and the first housing has a partitioning portion. One end of the detection electrode is connected to an input portion of the oscillation circuit via a connection hole provided in a plate.
【００１２】請求項８記載の発明は、請求項６又は７記
載の流体検知センサにおいて、前記第１及び第２の筐体
は、対向するいずれかの溝部の一端に設けた接続孔を介
して前記ガード電極と前記発振回路の出力部とを接続可
能に形成してなることを特徴とする。According to an eighth aspect of the present invention, in the fluid detection sensor according to the sixth or seventh aspect, the first and second housings are connected via a connection hole provided at one end of one of the opposed grooves. The guard electrode and the output section of the oscillation circuit are formed so as to be connectable.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１は、本発明の流体検知センサ
の一例を示す展開斜視図であり、図２はその第１の筐体
の展開斜視図、図３は、第２の筐体の展開斜視図であ
る。図１乃至図３において、流体検知センサ１は、検知
電極２とこの検知電極への外部の影響を遮断するガード
電極３と図示されない検知回路と、それらを収納する筐
体とを備えている。検知電極２は第１の筐体１０に収納
され、ガード電極３は第２の筐体２０に収納される。検
知電極２及びガード電極３をそれぞれ収容した第１及び
第２の筐体は、図示しない管路−例えば生ビールを移送
するゴム管を挟んで着脱容易に結合される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an example of the fluid detection sensor of the present invention, FIG. 2 is an exploded perspective view of a first case, and FIG. 3 is an exploded perspective view of a second case. 1 to 3, the fluid detection sensor 1 includes a detection electrode 2, a guard electrode 3 for blocking external influences on the detection electrode, a detection circuit (not shown), and a housing for accommodating them. The detection electrode 2 is housed in the first housing 10, and the guard electrode 3 is housed in the second housing 20. The first and second housings containing the detection electrode 2 and the guard electrode 3, respectively, are easily connected to and detached from each other via a conduit (not shown), for example, a rubber tube for transferring draft beer.
【００１４】図４は、第１及び第２の筐体を結合した状
態における電極収納部の横断面の模式図である。第１及
び第２の筐体１０，２０は、管路Ｐを挟んで面Ｃで当接
して、後述する結合手段により結合されている。図１乃
至３を参照しつつ図４に基づいて内部を説明する。ま
ず、第１の筐体１０は、図２及び図４に示すように、中
板１６により上下に仕切られており、上部は中壁１３に
よって貫通部１１と溝部１２に仕切られている。貫通部
１１には、検知電極２が収納される。また、中板１６の
下部には、図４に示すように、支持部１６ａを介して基
板３０が収納され、基板３０には、検知回路４０が形成
されている。検知回路４０は、発振回路５０と判定回路
５０とで構成される。FIG. 4 is a schematic cross-sectional view of the electrode housing in a state where the first and second housings are connected. The first and second housings 10 and 20 abut on a surface C with the pipe P interposed therebetween, and are connected by connecting means described later. The interior will be described based on FIG. 4 with reference to FIGS. First, as shown in FIGS. 2 and 4, the first housing 10 is vertically partitioned by a middle plate 16, and the upper portion is partitioned into a through portion 11 and a groove 12 by a middle wall 13. The sensing electrode 2 is housed in the through portion 11. As shown in FIG. 4, a substrate 30 is accommodated below the middle plate 16 via a support portion 16a, and a detection circuit 40 is formed on the substrate 30. The detection circuit 40 includes an oscillation circuit 50 and a determination circuit 50.
【００１５】検知電極２は、図２に示すようにほぼ矩形
状の導電性平板を管路Ｐの形状に対応するよう湾曲させ
て形成し、その一端に端子部２ａを設けてある。この端
子部２ａにリード線ｗ1 を取り付け、中板１６に設けら
れた接続孔１６ｂを介して発振回路５０に接続される。
また、第１の筐体１０の両側溝部１２、１２の対角線上
の端部に設けられた接続孔１７，１７には、ナットＮが
埋め込まれる。このナットＮに対し図示しないビスを用
いて図４に示すリード線ｗ2 を取り付け、発振回路５０
の出力部に接続しておく。また、検知された信号を出力
する判定回路の出力は電線ｗ3 を通して所要の表示部、
警報部、又は制御回路に接続される。As shown in FIG. 2, the sensing electrode 2 is formed by bending a substantially rectangular conductive flat plate so as to correspond to the shape of the conduit P, and has a terminal 2a at one end. The terminal portion 2a mounting the lead w 1, is connected to the oscillation circuit 50 via the connecting hole 16b provided in the intermediate plate 16.
In addition, nuts N are embedded in connection holes 17, 17 provided at diagonal ends of both side grooves 12, 12 of the first housing 10. Attaching a lead wire w 2 shown in FIG. 4 with screws (not shown) to the nut N, the oscillation circuit 50
Output unit. Further, the required display output through the electric wire w 3 of the decision circuit for outputting a detection signal,
Connected to an alarm unit or control circuit.
【００１６】次に図３及び図４に示すように、第２の筐
体２０は、ガード電極収納部が中板２６によって上下に
仕切られており、その下部は中壁２３によって貫通部２
１と溝部２２に仕切られている。溝部２２には図３に示
すように、断面コの字形のガード電極３の両側面部３ａ
を挿通可能なスリット２４が設けられており、ガード電
極３は、中板２６の上部からその両側面部３ａをスリッ
トに差し込み、その底面部３ｂを中板２６の上面に両面
テープ２５を介して当接して接着させ、その上に上蓋２
７を嵌め込む。ガード電極３の底面３ｂの一端には端子
３ｃが設けられており、中板２６及び上蓋２７の形状も
それに対応する部分２６ｃ及び２７ｃを設けてある。ま
た、端子３ｃには端子孔３ｄが設けられており、中板２
６及び上蓋２７にもこれに対応する接続孔２６ｄ、２７
ｄが設けられている。Next, as shown in FIG. 3 and FIG. 4, the second housing 20 has a guard electrode housing portion vertically divided by an intermediate plate 26, and a lower portion thereof is formed by a middle wall 23 with a penetrating portion 2.
1 and a groove 22. As shown in FIG. 3, both sides 3a of the guard electrode 3 having a U-shaped cross section are formed in the groove 22.
The guard electrode 3 is formed by inserting both side surfaces 3 a into the slit from above the middle plate 26, and applying the bottom surface 3 b to the upper surface of the middle plate 26 via a double-sided tape 25. Touch and adhere, and then cover 2
7 is fitted. A terminal 3c is provided at one end of the bottom surface 3b of the guard electrode 3, and the shapes of the middle plate 26 and the upper lid 27 are also provided with corresponding portions 26c and 27c. The terminal 3c is provided with a terminal hole 3d.
6 and the upper lid 27 also have corresponding connection holes 26d, 27
d is provided.
【００１７】以上のように構成された第１及び第２の筐
体１０，２０を前述のように管路Ｐを挟んで結合する。
この例では、結合手段はビスＢとナットＮからなり、ほ
ぼ矩形状の筐体１０，２０の対角線上のコーナー部に設
けられた孔を介して結合される。その際、図２に示す第
１の筐体のコーナー部１７，１７には予めナットＮを取
り付けておく。そして、一方のコーナー部では図１乃至
図３に示すように、接続孔２６ｄ、２７ｄ及び端子孔３
ｄを介して、ビスＢでナットＮに結合する。そうすると
ガード電極３は、端子３ｃ、ビスＢ、ナットＮ及びリー
ド線Ｗ2 を介して発振回路５０の出力部に接続されるこ
とになる。そして、もう一方のコーナー部で図１に示す
ように第２の筐体の孔２８を介して、ビスＢを第１の筐
体の孔１７に取り付けられたナットＮに結合すれば、流
体検知センサ１が出来上がる。The first and second housings 10 and 20 configured as described above are connected with the pipe P interposed therebetween as described above.
In this example, the coupling means includes a screw B and a nut N, and is coupled via holes provided at diagonal corners of the substantially rectangular casings 10 and 20. At this time, nuts N are attached to the corner portions 17, 17 of the first housing shown in FIG. 2 in advance. In one corner, as shown in FIGS. 1 to 3, the connection holes 26d and 27d and the terminal holes 3d are formed.
Via d, it is connected to the nut N with a screw B. Then the guard electrode 3, the terminal 3c, bis B, and through the nut N and the lead wire W 2 is to be connected to the output of the oscillation circuit 50. Then, as shown in FIG. 1, the screw B is connected to the nut N attached to the hole 17 of the first housing at the other corner through the hole 28 of the second housing, as shown in FIG. The sensor 1 is completed.
【００１８】以上のように、簡単な構造の第１及び第２
の筐体に検知電極２及びガード電極３を収納し、簡単な
結合手段で組み立てるだけで、検知電極２がガード電極
３の開口端面内に入るように組み合わされるので、検知
電極２に対する外部からの影響は、ガード電極３によっ
て遮断される。また、第１の筐体において、検知電極２
と検知回路４０を有する基板３０とは中板１６を介して
層状に配列されるので長手方向にも径方向にもスペース
が少なくてすむ。なお、上記の例では、検知電極２は矩
形板を湾曲させたものとしたが、平板であってもよく、
また必ずしも矩形状に限定されず、細長いほぼ矩形状の
平板又は湾曲板であればよい。また、ガード電極３は、
検知電極２と別の筐体に収納され、第１及び第２の筐体
を結合したとき、検知電極２をガードするように配置さ
れるものであればよいが、断面ほぼコの字形とすると、
矩形状の第１及び第２の筐体の体積を小さくすることが
できる。As described above, the first and second structures having a simple structure are used.
The detection electrode 2 and the guard electrode 3 are housed in the housing of the above, and the detection electrode 2 is assembled so as to enter the opening end face of the guard electrode 3 simply by assembling with a simple coupling means. The influence is blocked by the guard electrode 3. In the first housing, the detection electrode 2
And the substrate 30 having the detection circuit 40 are arranged in a layered manner with the middle plate 16 interposed therebetween, so that a small space is required in both the longitudinal direction and the radial direction. In the above example, the detection electrode 2 is formed by bending a rectangular plate, but may be a flat plate.
The shape is not necessarily limited to the rectangular shape, but may be any long and narrow rectangular or flat plate or curved plate. Also, the guard electrode 3
If it is housed in a separate housing from the detection electrode 2 and is coupled to the first and second housings, it may be arranged so as to guard the detection electrode 2. ,
The volume of the first and second rectangular housings can be reduced.
【００１９】検知回路４０の一例を図５に示す。検知回
路４０は、発振回路５０と判定回路６０とからなる。発
振回路５０は、演算増幅器Ａと静電容量素子Ｃ1 及び抵
抗素子Ｒ1 ，Ｒ2 ，Ｒ3 ，Ｒ4 とで構成され、その入力
端子５１に接続される検知電極２の対大地静電容量Ｃx
と前記静電容量素子Ｃ1 及び抵抗素子Ｒ1 ，Ｒ2 ，
Ｒ3 ，Ｒ4 とでウィーンブリッジ発振器が構成される。
発振周波数 fx は、 fx ＝１／（２π）×（Ｃ1 ×Ｃx ×Ｒ1 ×Ｒ4 ）1/2 (1) となる。したがって、静電容量Ｃx が小さくなると、発
振周波数 fx は大きくなる。この条件で定まる周波数 f
x の信号が出力端子５２から出力される。FIG. 5 shows an example of the detection circuit 40. The detection circuit 40 includes an oscillation circuit 50 and a determination circuit 60. The oscillation circuit 50 includes an operational amplifier A, a capacitance element C 1, and resistance elements R 1 , R 2 , R 3 , and R 4. Capacity C x
And the capacitance element C 1 and the resistance elements R 1 , R 2 ,
R 3 and R 4 constitute a Wien bridge oscillator.
Oscillation frequency f x is, f x = 1 / (2π ) × (C 1 × C x × R 1 × R 4) becomes 1/2 (1). Therefore, when the capacitance C x decreases, the oscillation frequency f x increases. Frequency f determined by this condition
The signal of x is output from the output terminal 52.
【００２０】判定回路６０は、発振回路５０の出力端子
５２から出力される信号の周波数 f x の変化を監視し、
目的に応じて所要の信号に変換して出力する回路であ
る。例えば、発振周波数 fx をそれに比例する直流電圧
Ｖx に変換する周期／電圧変換回路と、この周期／電圧
変換回路の出力を基準値に照らしてそれを下回ったり又
は上回ったりしているかどうかを判定するコンパレータ
と、コンパレータが作動したとき、所定の警報又は制御
信号を発する出力回路などで構成される。また、対大地
静電容量が基準値に達したときに発振回路５０が発振す
るように回路定数を設定しておき、判定回路６０によっ
て発振出力の有無を検知するようにしてもよい。以上の
ように簡単な回路で構成され、しかも、検知電極２やガ
ード電極３と検知回路４０との接続が短い距離で行わ
れ、外部から影響を受けにくい。また、発振回路に演算
増幅器Ａを用いており、ガード電極３は発振回路５０の
出力側に接続されるので、この点からみた演算増幅器Ａ
の入力インピーダンスが小さく、外部からの静電誘導、
電磁誘導を受けるおそれがない。The judgment circuit 60 is an output terminal of the oscillation circuit 50.
52, the frequency f of the signal output from xMonitor changes in
It is a circuit that converts the signal into a required signal according to the purpose and outputs it.
You. For example, the oscillation frequency fxIs the proportional DC voltage
VxAnd a cycle / voltage conversion circuit for converting the
If the output of the conversion circuit falls below the reference value,
Is a comparator that determines whether or not
And a predetermined alarm or control when the comparator is activated
It is composed of an output circuit that emits a signal. Against the earth
The oscillation circuit 50 oscillates when the capacitance reaches the reference value.
The circuit constants are set so that
Alternatively, the presence or absence of an oscillation output may be detected. More than
It is composed of a simple circuit as shown in FIG.
The connection between the lead electrode 3 and the detection circuit 40 is made over a short distance.
And is less susceptible to external influences. Also, calculate
The amplifier A is used, and the guard electrode 3
Since it is connected to the output side, the operational amplifier A
Input impedance is small, electrostatic induction from the outside,
There is no possibility of receiving electromagnetic induction.
【００２１】次に、図６にもとづいて上記流体検知セン
サの用途の一例とその作動について説明する。７０は飲
料液のディスペンサである。飲料液ディスペンサ７０
は、筐体７１とその外部にある飲料液貯蔵タンク７２と
図示しない制御装置の指令に基づいて生ビールを送り出
す加圧装置７３と、この飲料液を移送する絶縁性ゴム管
Ｐと、この飲料液を冷却するクーラー７４と、飲料液を
注ぐコック７５等を備えている。そして、流体検知セン
サ１の出力部は表示ランプＬやガス抜き弁７８などに接
続されている。コック７５が開かれる度に、飲料液貯蔵
タンク７２から飲料液が送出され、飲料液の残量が少な
くなったり、無くなった場合には、これを飲料液貯蔵タ
ンク７２に補給するか又は新しい飲料液貯蔵タンクと交
換する必要がある。そして、この補給や交換をクーラ７
４内で冷却されている飲料液がなくなってから行ってい
たのでは、補給や交換の間客を待たせることになり、ま
た、管路Ｐ内の飲料液が残り少ない状態になると、コッ
ク７５の抽出口から飲料液が飛び散って操作者にかかっ
てしまうことがある。飲料液がビールのように泡を含ん
でいる場合は特にその飛散度が大きい。そこで、クーラ
ー７４より上流側（飲料液貯蔵タンク側）に流体検知セ
ンサ１を取り付け、クーラー７４内にまだ飲料液が残っ
ている間に、飲料液貯蔵タンク７２内の飲料液の残量が
なくなったことを検知する。飲料液の誘電率は、空気の
それよりも大きいので、流体検知センサ１の検知電極２
の対大地静電容量Ｃx は、検知電極２に対向する管路内
部に飲料液があるとき最大値ＣMAX であり、無くなって
いくにつれて小さくなり、完全になくなったときに最小
値ＣMIN となる。したがって、前述のように、発振回路
５０の発振周波数 fx が大きくなるので、これが基準値
に達したとき判定回路６０で検知するようにしておけば
よい。また、対大地静電容量Ｃx が最大値ＣMAX と最小
値ＣMIN との中間の適切な基準値に達したときに発振回
路５０が発振するように回路定数を設定しておき、判定
回路６０によって発振出力の有無を検知するようにして
もよい。判定回路６０が作動すると、その出力によって
表示ランプＬが点灯し、管理者や操作者に知らせる。ま
た、ガス抜き弁７８を作動させ、ガス圧を下げるので飲
料液の飛散を防止することができる。Next, an example of the use of the fluid detection sensor and its operation will be described with reference to FIG. Reference numeral 70 denotes a beverage dispenser. Beverage dispenser 70
Is a housing 71, a beverage storage tank 72 outside thereof, a pressurizing device 73 for sending draft beer based on a command from a control device (not shown), an insulating rubber pipe P for transporting the beverage, And a cock 75 for pouring a drink. The output of the fluid detection sensor 1 is connected to the display lamp L, the vent valve 78 and the like. Each time the cock 75 is opened, the beverage is discharged from the beverage storage tank 72. When the remaining amount of the beverage is low or exhausted, the beverage is supplied to the beverage storage tank 72 or a new beverage is supplied. It needs to be replaced with a liquid storage tank. And this supply and exchange
If the beverage is cooled after the liquid in the pipe 4 is exhausted, the customer is kept waiting for replenishment or replacement. When the amount of the liquid in the pipe P is low, the cock 75 is closed. In some cases, the beverage splatters out of the extraction port and impinges on the operator. Particularly when the beverage contains foam like beer, the degree of scattering is large. Therefore, the fluid detection sensor 1 is mounted on the upstream side of the cooler 74 (on the side of the beverage storage tank), and while the beverage still remains in the cooler 74, the remaining amount of the beverage in the beverage storage tank 72 is exhausted. Is detected. Since the dielectric constant of the drinking liquid is higher than that of air, the detection electrode 2 of the fluid detection sensor 1
Vs. earth capacitance C x of a maximum value C MAX when the internal pipe facing the sensing electrode 2 is the beverage liquid, disappeared decreases as going, and a minimum value C MIN when completely disappeared Become. Therefore, as described above, the oscillation frequency f x of the oscillator circuit 50 is increased, it is sufficient so as to sense the determination circuit 60 when it reaches the reference value. Alternatively, it is acceptable to set the circuit constants such that the oscillation circuit 50 oscillates when the pair earth capacitance C x reaches the appropriate reference value intermediate between the maximum value C MAX and the minimum value C MIN, the determination circuit 60 may be used to detect the presence or absence of an oscillation output. When the determination circuit 60 operates, the display lamp L is turned on by the output to notify the manager or the operator. Further, since the gas vent valve 78 is operated to lower the gas pressure, it is possible to prevent the beverage liquid from scattering.
【００２２】なお、流体検知センサ１の取り付け位置
は、壁面に近い位置が好ましく、例えば図示のように壁
面に設けた厚肉部７６にネジを切り、これにボルト７７
を図１に示す取り付け孔２９、１８を通して締着する。
このように取り付けが２本のボルトでできるので極めて
簡単である。また、流体検知センサ１内部の検知電極２
に対するガード電極３や回路素子及びゴム管Ｐの位置関
係が一定になるだけでなく、壁面や外部の構成物に対す
る位置関係も一定となるので、検知電極２の対大地静電
容量のレベルが安定し、正確な測定ができる。The mounting position of the fluid detection sensor 1 is preferably close to the wall surface. For example, a thick portion 76 provided on the wall surface is threaded as shown in FIG.
Are fastened through the mounting holes 29 and 18 shown in FIG.
As described above, the attachment can be made with two bolts, so that it is extremely simple. The detection electrode 2 inside the fluid detection sensor 1
Not only is the positional relationship between the guard electrode 3 and the circuit element and the rubber tube P constant, but also the positional relationship with respect to the wall surface and external components is constant, so that the level of the detection electrode 2 with respect to the ground is stable. And accurate measurements can be made.
【００２３】[0023]
【発明の効果】以上に説明したように、請求項１の発明
は、前記筐体が、管路を挟んで着脱容易な第１及び第２
の細長の筐体からなり、検知電極は第１の筐体に、ガー
ド電極は第２の筐体にそれぞれ収納され、しかも検知回
路は、第１又は第２の筐体に、検知電極又はガード電極
とともに長手方向を一致させて層状に配設してあるの
で、管路に対して垂直方向の長さが短く、管路周辺のス
ペースが少なくてすみ、着脱が容易であるから、取り付
け、取り外し作業が簡単であり、しかも、前記第１の筐
体と前記第２の筐体とを結合手段により前記管路を挟ん
で結合したとき、前記検知電極と前記ガード電極が前記
管路を介して対向し、前記ガード電極が前記検知電極に
対する外部の影響を遮断するように配設されているの
で、静電容量の検知が正確になり、また、検知回路は第
１又は第２の筐体に、検知電極又はガード電極とともに
層状に配設されるので、長手方向にも、径方向にも省ス
ペースができるという効果を奏する。As described above, according to the first aspect of the present invention, the first and second housings can be easily attached and detached with the conduit interposed therebetween.
The detection electrode is housed in the first housing, the guard electrode is housed in the second housing, and the detection circuit is mounted on the first or second housing. Since it is arranged in layers with the electrodes aligned in the longitudinal direction, the length in the vertical direction to the pipe is short, the space around the pipe is small, and it is easy to attach and remove The operation is simple, and when the first housing and the second housing are connected with the connecting means sandwiching the conduit, the detection electrode and the guard electrode are connected via the conduit. Since the guard electrodes are opposed to each other and are arranged so as to block external influences on the detection electrodes, the detection of the capacitance is accurate, and the detection circuit is provided in the first or second housing. Since it is arranged in layers with the detection electrode or guard electrode, Longitudinally, nor radially an effect that it is space-saving.
【００２４】請求項２の発明は、請求項１の発明におい
て、検知回路は、検知電極に接続されてその対大地静電
容量の変化により発振周波数が変化する発振回路と、こ
の発振回路の出力信号から前記対大地静電容量の変化を
判定する判定回路とを有し、ガード電極は、発振回路の
出力部に接続してあるので、ガード電極が検知電極とほ
ぼ同電位に保持され両者間の静電容量はほぼゼロに近い
ものとなり、外部の影響が遮断される。またガード電極
が接続される発振回路出力部の入力インピーダンスが小
さいので、ガード電極自体に外部からの静電、電磁誘導
の生じるおそれも少なく、したがって検知電極に対する
２次的影響も生じないという効果を奏する。According to a second aspect of the present invention, in the first aspect of the present invention, the detection circuit is connected to the detection electrode, the oscillation frequency of which changes due to a change in the capacitance with respect to the ground, and the output of the oscillation circuit. A judgment circuit for judging a change in the electrostatic capacitance with respect to the ground from a signal, and since the guard electrode is connected to the output portion of the oscillation circuit, the guard electrode is held at substantially the same potential as the detection electrode, and Becomes almost zero, and the external influence is cut off. In addition, since the input impedance of the oscillation circuit output section to which the guard electrode is connected is small, there is little possibility that external static electricity or electromagnetic induction will occur on the guard electrode itself, and therefore, there is no secondary effect on the detection electrode. Play.
【００２５】請求項３記載の発明は、請求項１又は２記
載の発明の効果に加えて、検知電極が、ほぼ矩形状の導
電性平板又はそれを管路の形状に対応するよう湾曲させ
た導電性板からなり、ガード電極が、ほぼ矩形状の導電
性板を開口側の幅が前記検知電極の幅より広い断面ほぼ
コの字形に形成してなり、検知電極の少なくとも両側端
部が前記ガード電極の開口端面内に入るように配設して
なるので、筐体を含む流体検知センサの体積をより小さ
くすることができるという効果を奏する。According to a third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, the detection electrode is formed in a substantially rectangular conductive flat plate or curved so as to correspond to the shape of a conduit. The guard electrode is made of a conductive plate, and the guard electrode is formed by forming a substantially rectangular conductive plate into a substantially U-shaped cross section whose width on the opening side is wider than the width of the detection electrode, and at least both end portions of the detection electrode are Since it is arranged so as to be located within the opening end face of the guard electrode, there is an effect that the volume of the fluid detection sensor including the housing can be further reduced.
【００２６】請求項４記載の発明は、請求項３記載の発
明の効果に加えて、第１及び第２の筐体が、矩形柱状を
なし、その対向面側の幅方向中央には管路の貫通部を、
その両側には溝部をそれぞれ有し、第２の筐体の両側の
溝部にはスリットを設けてなり、第１の筐体の前記管路
貫通部には検知電極を、第２の筐体には、断面コの字形
のガード電極の両側面を前記スリットに嵌め込み、前記
第１及び第２の筐体を結合したとき、前記検知電極と前
記ガード電極が対向するように配設してなるので、ガー
ド電極が簡単に第２の筐体に固定でき、しかも検知電極
とガード電極とが、第１の筐体の中板によって確実に絶
縁されるという効果を奏する。According to a fourth aspect of the present invention, in addition to the effect of the third aspect, the first and second housings have a rectangular columnar shape, and a conduit is provided at the center in the width direction on the opposing surface side. Through the
A groove is provided on each side thereof, and slits are provided on both sides of the second housing. A detection electrode is provided on the conduit passage portion of the first housing, and a detection electrode is provided on the second housing. Since the guard electrode having a U-shaped cross section is fitted into the slit, the detection electrode and the guard electrode are disposed so as to face each other when the first and second housings are combined. In addition, the guard electrode can be easily fixed to the second housing, and the detection electrode and the guard electrode are reliably insulated by the middle plate of the first housing.
【００２７】請求項５記載の発明は、請求項４記載の発
明の効果に加えて、第１及び第２の筐体の長手方向両端
部の溝側に両筐体を結合するボルト等の取り付け手段を
貫通する貫通孔を有するので、取り付け手段を差し込
み、又は取り外すことによって両筐体を壁面等に簡単に
着脱することができるという効果を奏する。According to a fifth aspect of the present invention, in addition to the effect of the fourth aspect, a bolt or the like for connecting the two housings to the grooves at both ends in the longitudinal direction of the first and second housings. Since there is a through hole penetrating the means, there is an effect that both housings can be easily attached to and detached from a wall surface or the like by inserting or removing the attaching means.
【００２８】請求項６記載の発明は、請求項４又は５に
記載の発明の効果に加えて、検知回路が、検知電極とと
もに第１の筐体に収納されるので、両者を接続する接続
部の距離が短く、検知電極が接続部を通じて外部からの
電気的影響を受けるおそれがないという効果を奏する。According to a sixth aspect of the present invention, in addition to the effect of the fourth or fifth aspect, since the detection circuit is housed in the first housing together with the detection electrode, a connection portion for connecting the two is provided. Is short, and there is no effect that the sensing electrode is not likely to be externally influenced by the electric connection through the connection portion.
【００２９】請求項７記載の発明は、請求項６記載の流
体検知センサにおいて、第１の筐体が、検知電極配設部
と、検知回路配設部とを有し、両者を仕切る中板に設け
た接続孔を介して前記検知電極の一端と前記発振回路の
入力部とが接続されるので、接続が簡単であり、しかも
検知回路各部の検知電極や被検知流体に対する距離が一
定となるので、浮遊静電容量が一定となり、検知電極と
被検知流体との間の静電容量の検知がより確実になると
いう効果を奏する。According to a seventh aspect of the present invention, in the fluid detection sensor according to the sixth aspect, the first housing has a detection electrode disposition portion and a detection circuit disposition portion, and the middle plate partitions the two. Since one end of the detection electrode and the input portion of the oscillation circuit are connected through the connection hole provided in the sensor circuit, the connection is simple, and the distance of each part of the detection circuit to the detection electrode and the fluid to be detected is constant. Therefore, there is an effect that the floating capacitance becomes constant and the detection of the capacitance between the detection electrode and the fluid to be detected becomes more reliable.
【００３０】請求項８記載の発明は、請求項６又は７記
載の費の効果に加えて、第１及び第２の筐体が、対向す
るいずれかの溝部の一端に設けた接続孔を介して前記ガ
ード電極と前記発振回路の出力部とを接続可能に形成し
てなるので、ガード電極と発振回路の出力部との接続が
確実かつ容易に行われるという効果を奏する。According to an eighth aspect of the present invention, in addition to the cost effect of the sixth or seventh aspect, the first and second housings are connected via a connection hole provided at one end of one of the opposed grooves. Thus, since the guard electrode and the output section of the oscillation circuit are formed so as to be connectable, there is an effect that the connection between the guard electrode and the output section of the oscillation circuit is reliably and easily performed.
【図１】本発明の流体検知センサの一例を示す展開斜視
図である。FIG. 1 is a developed perspective view showing one example of a fluid detection sensor of the present invention.
【図２】本発明の流体検知センサの第１の筐体の展開斜
視図である。FIG. 2 is an exploded perspective view of a first housing of the fluid detection sensor of the present invention.
【図３】本発明の流体検知センサの第２の筐体の展開斜
視図である。FIG. 3 is an exploded perspective view of a second housing of the fluid detection sensor according to the present invention.
【図４】本発明の流体検知センサの電極収納部横断面模
式図である。FIG. 4 is a schematic cross-sectional view of an electrode housing portion of the fluid detection sensor of the present invention.
【図５】本発明の流体検知センサの検知回路のブロック
図である。FIG. 5 is a block diagram of a detection circuit of the fluid detection sensor according to the present invention.
【図６】本発明の流体検知センサの使用例の説明図であ
る。FIG. 6 is an explanatory diagram of a usage example of the fluid detection sensor of the present invention.
【図７】従来の静電容量形近接センサの模式図である。FIG. 7 is a schematic diagram of a conventional capacitive proximity sensor.
１ 流体検知センサ ２ 検知電極 ３ ガード電極 １０ 第１の筐体 １１ 第１の筐体の管路貫通部 ２０ 第２の筐体 ２１ 第２の筐体の管路貫通部 ３０ 基板 ４０ 検知回路 ５０ 発振回路 ６０ 判定回路 ７０ 飲料液ディスペンサ DESCRIPTION OF SYMBOLS 1 Fluid detection sensor 2 Detecting electrode 3 Guard electrode 10 1st case 11 Pipe penetration part of the 1st case 20 Second case 21 Pipe penetration part of the 2nd case 30 Substrate 40 Detection circuit 50 Oscillation circuit 60 Judgment circuit 70 Drinking liquid dispenser
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山下 貴弘 大阪府東大阪市岩田町２丁目３番１号 タツタ電線株式会社内 (72)発明者 小池 輝男 三重県四日市市富士町一番27号 富士電 機株式会社民生機器事業本部 三重工場 内 (72)発明者 栗山 直紀 岐阜県可児市下切姫ケ丘１−23 富士電 機冷機製造株式会社内 (56)参考文献 特開 平７−280624（ＪＰ，Ａ) 特開 平５−180795（ＪＰ，Ａ) 特開 昭56−48520（ＪＰ，Ａ) 特開 昭59−73825（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01F 23/26 G01P 13/00 H01H 36/00 G01N 27/22 G01V 3/08 H01H 35/00 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takahiro Yamashita 2-3-1, Iwata-cho, Higashi-Osaka-shi, Osaka Tatsuta Electric Wire Co., Ltd. (72) Inventor Teruo Koike No. 27, Fuji-cho, Fuji-cho, Yokkaichi-shi, Mie Prefecture Fuji (72) Inventor Naoki Kuriyama 1-23 Shimogiri Himegaoka, Kani City, Gifu Prefecture Fuji Electric Refrigeration Machine Manufacturing Co., Ltd. (56) Reference JP-A 7-280624 (JP, A JP-A-5-180795 (JP, A) JP-A-56-48520 (JP, A) JP-A-59-73825 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G01F 23/26 G01P 13/00 H01H 36/00 G01N 27/22 G01V 3/08 H01H 35/00
Claims (8)
量を検知する検知回路と前記検知電極への外部の影響を
遮断するガード電極とそれらを収納する筐体とを有し、
管路内の流体の変化を検知する流体検知センサにおい
て、 前記筐体は、管路を挟んで着脱容易な第１及び第２の細
長の筐体からなり、前記検知電極は第１の筐体に、前記
ガード電極は第２の筐体にそれぞれ収納され、 前記第１の筐体と前記第２の筐体とを結合手段により前
記管路を挟んで結合したとき、前記検知電極と前記ガー
ド電極が前記管路を介して対向し、前記ガード電極が前
記検知電極に対する外部の影響を遮断するように配設さ
れ、 前記検知回路は前記第１又は第２の筐体に、検知電極又
はガード電極とともに長手方向を一致させて層状に配設
してなることを特徴とする流体検知センサ。A detection circuit for detecting a capacitance of the detection electrode with respect to the ground, a guard electrode for blocking external influences on the detection electrode, and a housing for accommodating them.
In a fluid detection sensor for detecting a change in fluid in a pipeline, the housing includes first and second elongated housings that are easily attached and detached across the pipeline, and the detection electrode is a first housing. The guard electrode is housed in a second housing, respectively, and when the first housing and the second housing are connected to each other across the conduit by a connecting means, the detection electrode and the guard are Electrodes are opposed to each other through the conduit, and the guard electrode is disposed so as to block external influences on the detection electrode. The detection circuit is provided on the first or second housing, with the detection electrode or the guard. A fluid detection sensor characterized by being disposed in layers with the electrodes in the same longitudinal direction.
て、 前記検知回路は、前記検知電極に接続されてその対大地
静電容量の変化により発振周波数が変化する発振回路
と、この発振回路の出力信号から前記対大地静電容量の
変化を判定する判定回路とを有し、 前記ガード電極は、前記発振回路の出力部に接続してな
ることを特徴とする流体検知センサ。2. The fluid detection sensor according to claim 1, wherein the detection circuit is connected to the detection electrode and has an oscillation frequency that changes according to a change in capacitance with respect to the ground, and an output of the oscillation circuit. A judging circuit for judging a change in the capacitance to ground from a signal, wherein the guard electrode is connected to an output section of the oscillation circuit.
おいて、 前記検知電極は、ほぼ矩形状の導電性平板又はそれを管
路の形状に対応するよう湾曲させた導電性板からなり、 前記ガード電極は、ほぼ矩形状の導電性板を開口側の幅
が前記検知電極の幅より広い断面ほぼコの字形に形成し
てなり、 前記検知電極の少なくとも両側端部が前記ガード電極の
開口端面内に入るように配設してなることを特徴とする
流体検知センサ。3. The fluid detection sensor according to claim 1, wherein the detection electrode is formed of a substantially rectangular conductive flat plate or a conductive plate which is curved so as to correspond to the shape of a conduit. The guard electrode is formed by forming a substantially rectangular conductive plate into a substantially U-shaped cross section whose opening side is wider than the width of the detection electrode, and at least both side ends of the detection electrode are open end surfaces of the guard electrode. A fluid detection sensor, which is disposed so as to enter inside.
て、 前記第１及び第２の筐体は、矩形柱状をなし、その対向
面側の幅方向中央には管路の貫通部を、その両側には溝
部をそれぞれ有し、前記第２の筐体の両側の溝部にはス
リットを設けてなり、 前記第１の筐体の前記管路貫通部には検知電極を、前記
第２の筐体には、前記断面コの字形のガード電極の両側
面を前記スリットに嵌め込み、前記第１及び第２の筐体
を結合したとき、前記検知電極と前記ガード電極が対向
するように配設してなることを特徴とする流体検知セン
サ。4. The fluid detection sensor according to claim 3, wherein the first and second housings have a rectangular column shape, and have a pipe passage penetrating portion at the center in the width direction on the opposite surface side, and both sides thereof. , Each of which has a groove, slits are provided in the grooves on both sides of the second housing, a detection electrode is provided in the conduit penetrating portion of the first housing, and a second housing is provided. The guard electrode having a U-shaped cross section is fitted into both sides of the guard electrode, and the detection electrode and the guard electrode are arranged to face each other when the first and second housings are combined. A fluid detection sensor, comprising:
おいて、 第１及び第２の筐体の長手方向両端部の溝側に両筐体を
結合するボルト等の取り付け手段を貫通する貫通孔を有
することを特徴とする流体検知センサ。5. The fluid detection sensor according to claim 4, wherein the first and second housings have through-holes penetrating through mounting means such as bolts connecting the two housings to groove sides of both ends in the longitudinal direction of the first and second housings. A fluid detection sensor comprising:
において、 前記検知回路は、前記検知電極とともに前記第１の筐体
に収納されることを特徴とする流体検知センサ。6. The fluid detection sensor according to claim 4, wherein the detection circuit is housed in the first housing together with the detection electrode.
て、 前記第１の筐体は、検知電極配設部と、検知回路配設部
とを有し、両者の仕切る中板に設けた接続孔を介して前
記検知電極の一端と前記発振回路の入力部とを接続して
なることを特徴とする流体検知センサ。7. The fluid detection sensor according to claim 6, wherein the first housing has a detection electrode disposition portion and a detection circuit disposition portion, and a connection hole formed in a middle plate separating the two. A fluid detection sensor, wherein one end of the detection electrode is connected to an input portion of the oscillation circuit via
おいて、 前記第１及び第２の筐体は、対向するいずれかの溝部の
一端に設けた接続孔を介して前記ガード電極と前記発振
回路の出力部とを接続可能に形成してなることを特徴と
する流体検知センサ。8. The fluid detection sensor according to claim 6, wherein the first and second housings are connected to the guard electrode and the oscillation via a connection hole provided at one end of one of the opposed grooves. A fluid detection sensor formed so as to be connectable to an output section of a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03268998A JP3348006B2 (en) | 1998-02-16 | 1998-02-16 | Fluid detection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03268998A JP3348006B2 (en) | 1998-02-16 | 1998-02-16 | Fluid detection sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11230815A JPH11230815A (en) | 1999-08-27 |
| JP3348006B2 true JP3348006B2 (en) | 2002-11-20 |
Family
ID=12365843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03268998A Expired - Fee Related JP3348006B2 (en) | 1998-02-16 | 1998-02-16 | Fluid detection sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3348006B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1380109B1 (en) * | 2001-04-12 | 2006-09-13 | AB Automotive Electronics Ltd. | Capacitive sensor |
| WO2014185241A1 (en) * | 2013-05-16 | 2014-11-20 | シャープ株式会社 | Capacitance sensor |
| JP7093924B2 (en) * | 2018-07-18 | 2022-07-01 | 島根県 | Non-contact measurement system |
| JP7253146B2 (en) | 2019-07-31 | 2023-04-06 | 株式会社リコー | Powder amount detection device, powder replenishment device and image forming device |
| CN112512752A (en) * | 2019-08-02 | 2021-03-16 | 深圳市越疆科技有限公司 | Obstacle avoidance method and device of device and controller |
-
1998
- 1998-02-16 JP JP03268998A patent/JP3348006B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11230815A (en) | 1999-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5187979A (en) | Multi-sensor probe assembly and method for fuel storage system including overflow protection means | |
| US6920787B2 (en) | Apparatus for determining and/or monitoring the filling level of a filling material in a container | |
| JP3348006B2 (en) | Fluid detection sensor | |
| US7728606B2 (en) | Measurement instrument | |
| RU2761102C9 (en) | Capacitive media interface level sensor | |
| KR20140002298A (en) | Water level sensor and test apparatus the same | |
| US20230296546A1 (en) | Sensor Device and Method for Detecting Properties of a Medium | |
| RU2759784C1 (en) | Inventions relating to capacitive level sensor of interface of media | |
| RU2761094C1 (en) | System related to capacitive interface level sensor | |
| RU2759692C1 (en) | Inventions related to capacitive level sensor of interface of media | |
| RU2761758C1 (en) | Inventions related to a capacitive media interface level sensor | |
| RU2761540C1 (en) | Capacitive level sensor of interface of media with coupling for housing for electrodes | |
| RU2761492C1 (en) | System related to capacitive interface level sensor | |
| RU2761093C1 (en) | Inventions related to a capacitive media interface level sensor | |
| RU2763017C1 (en) | Liquid flow monitoring system containing one capacitive sensor for the interface level | |
| RU2784596C2 (en) | Sensitive element of capacitive level sensor of interface( | |
| RU2784613C2 (en) | Liquid flow monitoring system containing several capacitive interface level sensors | |
| RU2784614C2 (en) | Liquid flow monitoring system containing one capacitive interface level sensor | |
| RU2789665C2 (en) | Fuel canister for fuel transport, containing one capacitive interface level sensor | |
| RU2784608C2 (en) | Capacitive interface level sensor | |
| RU208412U1 (en) | ELECTRODE HOUSING FOR CAPACITIVE SENSOR OF SECTION BORDER LEVEL | |
| RU2784579C2 (en) | Tank for fuel transport, containing several capacitive interface level sensors | |
| RU2789718C2 (en) | Fuel canister for fuel transport, containing one capacitive interface level sensor | |
| RU2758995C1 (en) | Inventions related to capacitive level sensor of media interface | |
| RU2789719C2 (en) | Fuel canister for fuel transport, containing one capacitive interface level sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313117 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070906 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080906 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080906 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090906 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090906 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100906 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110906 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110906 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120906 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120906 Year of fee payment: 10 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120906 Year of fee payment: 10 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120906 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130906 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130906 Year of fee payment: 11 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130906 Year of fee payment: 11 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |