JPH0371055B2 - - Google Patents
Info
- Publication number
- JPH0371055B2 JPH0371055B2 JP59048492A JP4849284A JPH0371055B2 JP H0371055 B2 JPH0371055 B2 JP H0371055B2 JP 59048492 A JP59048492 A JP 59048492A JP 4849284 A JP4849284 A JP 4849284A JP H0371055 B2 JPH0371055 B2 JP H0371055B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- segment
- lead wire
- insulating substrate
- capacitance
- 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 - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 14
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000011162 core material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は、静電容量式液面計に適した電極構造
に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an electrode structure suitable for a capacitive liquid level gauge.
（従来技術）
地下タンク等に収容された燃料油の残量は、タ
ンクの上部から底部に亘る長さを持つた同軸状の
２本の電極からなる静電容量測定棒を用い、液面
レベルに比例して電極の静電容量が変化すること
を利用して測定されている。(Prior art) The remaining amount of fuel oil stored in an underground tank, etc. can be determined by measuring the liquid level using a capacitance measuring rod consisting of two coaxial electrodes with a length extending from the top to the bottom of the tank. It is measured by utilizing the fact that the capacitance of the electrode changes in proportion to .
ところで、タンクに収容されている燃料油は、
外気温度の影響を受けて誘電率が変化し易く、測
定値に大きな誤差を含むという不都合がある。こ
のような不都合を解消するため、第５図に示した
ように液深電極を上下方向に複数に分割してセグ
メント電極A1〜A5を形成し、電極の切れ目B1〜
B4に合せてフロートスイツチLS1〜LS4を設けた
デジタル・アナログ型の静電容量式液面計が提案
されている。 By the way, the fuel oil stored in the tank is
There is a disadvantage that the dielectric constant easily changes due to the influence of the outside temperature, and the measured value contains a large error. In order to eliminate this inconvenience, as shown in FIG. 5, the deep liquid electrode is divided into a plurality of segments in the vertical direction to form segment electrodes A 1 to A 5 , and the electrode cuts B 1 to
A digital/analog capacitive liquid level gauge has been proposed that is equipped with float switches LS 1 to LS 4 in conjunction with B 4 .
これによれば、フロートスイツチを基準レベル
としてセグメント電極による測定値を校正するこ
とができ、外気温度の変化による測定誤差を軽減
することができる。 According to this, the values measured by the segment electrodes can be calibrated using the float switch as a reference level, and measurement errors due to changes in outside temperature can be reduced.
ところが、セグメント電極を測定装置に接続す
る関係上、リード線を一方の端部から引出さねば
ならず、各電極を通るリード線の本数が相違して
セグメント電極に作用する漂遊容量が異なり、測
定精度が低下するという別の問題があつた。 However, in order to connect the segment electrodes to the measurement device, the lead wires must be drawn out from one end, and the number of lead wires passing through each electrode is different, resulting in different stray capacitances acting on the segment electrodes. Another problem was the loss of accuracy.
（目的）
本発明はこのような問題に鑑み、漂遊容量によ
る測定誤差をなくしたデイジタル・アナログ型の
静電容量式液面計に適した電極構造を提供するこ
とである。(Objective) In view of these problems, it is an object of the present invention to provide an electrode structure suitable for a digital/analog type capacitive liquid level gauge that eliminates measurement errors due to stray capacitance.
（構成）
そこで、以下に本発明の詳細を図示した実施例
に基づいて説明する。(Structure) Therefore, details of the present invention will be described below based on illustrated embodiments.
第１図イ〜ハは、本発明の測定電極基体の実施
例を示すものであつて、図中符号１は、測定すべ
き液深範囲以上の長さを持つ長尺状の絶縁基板
で、後述する用途に合せて可撓性もしくは剛性を
持つように耐油性高分子材料をフイルム状もしく
は板状に形成し、表面に矩形状をなす複数の導電
面を蒸着やエツチング技術（以下、これをプリン
ト配線技術と呼ぶ）により間隔２ａ〜２ｇを設け
てセグメント電極パターン３ａ〜３ｉを、また裏
面には少なくともセグメント電極パターンの数以
上のリード線パターン４ａ〜４ｈを基板１の上端
から下端に亘つて一直線状にプリント技術により
形成されている。電極パターン３ａ〜３ｈは、い
ずれか１本のリード線パターンと対向する位置に
穿設したスルーホール５ａ〜５ｈを介して１本の
リード線４ａ〜４ｈに電気接続され、基板上部の
引出端子６ａ〜６ｈに静電容量値を伝達するよう
構成されている。なお、表面に形成した電極パタ
ーンとリード線パターンとの間で静電結合を防止
するため、絶縁基板は、静電結合を無視し得る程
度の厚さを保持するように構成されている。 1A to 1C show an embodiment of the measurement electrode substrate of the present invention, and reference numeral 1 in the figure is an elongated insulating substrate having a length longer than the liquid depth range to be measured; An oil-resistant polymer material is formed into a film or plate shape to have flexibility or rigidity according to the application described below, and multiple rectangular conductive surfaces are formed on the surface using vapor deposition or etching techniques (hereinafter referred to as this). Segment electrode patterns 3a to 3i are provided at intervals 2a to 2g using printed wiring technology (referred to as printed wiring technology), and lead wire patterns 4a to 4h, which are at least as many as the number of segment electrode patterns, are formed on the back surface from the upper end to the lower end of the substrate 1. It is formed in a straight line using printing technology. The electrode patterns 3a to 3h are electrically connected to one of the lead wires 4a to 4h via through holes 5a to 5h formed at positions facing any one of the lead wire patterns, and are electrically connected to one of the lead wires 4a to 4h at a lead-out terminal 6a on the upper part of the board. ~6h is configured to transmit the capacitance value. Note that in order to prevent electrostatic coupling between the electrode pattern formed on the surface and the lead wire pattern, the insulating substrate is configured to have a thickness that allows the electrostatic coupling to be ignored.
この実施例によれば、各セグメント電極パター
ンには同じ本数のリード線が裏面で対向させて配
設されるため、セグメント電極に発生する漂遊静
電容量は、それぞれのセグメント電極で同じ値と
なり、液面レベルを正確に測定することができ
る。 According to this embodiment, since the same number of lead wires are arranged facing each other on the back side of each segment electrode pattern, the stray capacitance generated in the segment electrodes has the same value in each segment electrode. The liquid level can be measured accurately.
第２図イ，ロは、本発明の測定電極基体の第２
の実施例を示すものであつて、フイルム状の絶縁
基板１の表面に上下方向に間隔を存して複数のセ
グメント電極３ａ〜３ｅと、これらの電極３ａ〜
３ｅの両側に２つのリード線パターン４a′〜４
e′及び４a′〜４e′を点対称となるようにグループ
化してプリント技術により形成し、一方のグルー
プをダミーとするようにしたものである。 Figures 2A and 2B show the second part of the measurement electrode base of the present invention.
This embodiment shows a plurality of segment electrodes 3a to 3e arranged vertically at intervals on the surface of a film-like insulating substrate 1, and these electrodes 3a to 3e.
Two lead wire patterns 4a' to 4 on both sides of 3e
e' and 4a' to 4e' are grouped point-symmetrically and formed by printing technology, and one group is used as a dummy.
この実施例によれば、各セグメント電極に作用
する漂遊容量を均一することができるばかりでな
く、絶縁基板を可及的に薄く形成してもリード線
を介してセグメント電極同士が静電結合する虞れ
がなく、さらに導電パターンの形成を片面だけで
済ませることができ、製作工程の簡素化ができて
製造コストの引下げが可能となる。 According to this embodiment, not only can the stray capacitance acting on each segment electrode be made uniform, but also the segment electrodes can be electrostatically coupled to each other via the lead wires even if the insulating substrate is made as thin as possible. There is no risk, and the conductive pattern can be formed on only one side, which simplifies the manufacturing process and reduces manufacturing costs.
第３図は、上述した測定電極を円筒状にして用
いた液深測定電極の実施例を示すものであつて、
図中符号７は、絶縁基板１（第１，２図）を可撓
性材料により形成した前述の測定電極基体で、絶
縁材料により形成した円筒状芯材８の表面に絶縁
基板１の側面が重なり合わないようにセグメント
電極パターン３ａ〜３ｈを表側にして巻付け、こ
れの外周に絶縁カバー９を覆せて構成されてい
る。１０は、外筒を兼ねた共通電極で、電極パタ
ーンの切目２ａ〜２ｇと一致する箇所に燃料油流
入口１１，１１…を穿設した金属製パイプからな
り、下部に合成樹脂材料の封止部材１２を設けて
測定電極基体７の下端を固定し、上部に測定電極
基体の各電極パターン３ａ〜３ｈからの静電容量
値を周波数信号に変換するデータ発振器１３を合
成樹脂１４によりモールドして収容し、上端に継
手１５を設けて延長パイプ１６を接続して構成さ
れている。なお、図中符号１７は、データ発信器
１３からの出力をモニターに伝送するための伝送
ケーブルを、１８は、電極基体７を共通電極１０
に同心状に取付ける支持部材をそれぞれ示してい
る。 FIG. 3 shows an embodiment of a liquid depth measuring electrode using the above-mentioned measuring electrode in a cylindrical shape.
Reference numeral 7 in the figure is the aforementioned measurement electrode base in which the insulating substrate 1 (FIGS. 1 and 2) is formed of a flexible material, and the side surface of the insulating substrate 1 is on the surface of the cylindrical core material 8 formed of an insulating material. The segment electrode patterns 3a to 3h are wound on the front side so as not to overlap, and an insulating cover 9 is placed over the outer periphery of the segment electrode patterns 3a to 3h. Reference numeral 10 denotes a common electrode that also serves as an outer cylinder, and is made of a metal pipe with fuel oil inlets 11, 11... drilled at locations corresponding to the cuts 2a to 2g of the electrode pattern, and a synthetic resin material sealed at the bottom. A member 12 is provided to fix the lower end of the measuring electrode base 7, and a data oscillator 13 for converting the capacitance value from each electrode pattern 3a to 3h of the measuring electrode base into a frequency signal is molded on the upper part with synthetic resin 14. A joint 15 is provided at the upper end to connect an extension pipe 16. In the figure, reference numeral 17 denotes a transmission cable for transmitting the output from the data transmitter 13 to the monitor, and 18 denotes a transmission cable for connecting the electrode base 7 to the common electrode 10.
The supporting members are shown to be concentrically attached to each other.
第４図は、液深測定電極を板状として用いたも
のであつて、図中符号１９は、自己姿勢保持可能
な程度の剛性を持つ絶縁基板１を使用した液深測
定電極基体で、外表面を弗素樹脂２０により被覆
し、電極パターン側に金属板を平行に配設して共
通電極２１を設け、両者の下端を絶縁材２２によ
り固定するとともに、上端をデータ発信器１３を
収容した支持部材２３に取付けて測定電極棒とし
て構成したものである。 FIG. 4 shows a liquid depth measuring electrode in the form of a plate, and reference numeral 19 in the figure is a liquid depth measuring electrode base using an insulating substrate 1 having enough rigidity to maintain its own posture. The surface is coated with fluororesin 20, a metal plate is arranged parallel to the electrode pattern side, a common electrode 21 is provided, the lower ends of both are fixed with an insulating material 22, and the upper end is a support housing the data transmitter 13. It is attached to the member 23 and configured as a measuring electrode rod.
これらの実施例によれば、測定電極の表面が絶
縁性皮膜９，２０により覆われているので、測定
電極板及びリード線の損傷や、異物による電極板
同士もしくは液深測定電極と共通電極間の短絡を
防止することができる。 According to these embodiments, since the surfaces of the measurement electrodes are covered with the insulating films 9 and 20, damage to the measurement electrode plates and lead wires, and damage caused by foreign matter between the electrode plates or between the liquid depth measurement electrode and the common electrode can be avoided. can prevent short circuits.
（効果）
以上説明したように本発明によれば、電気絶縁
基板の一方の面に上下方向に間隔を設けて複数の
セグメント電極を、また前記電気絶縁基板の他方
の面に少なくとも前記セグメント電極の上下端に
及ぶ長さのリード線部を前記セグメント電極の数
以上形成し、１本のリード線に１つのセグメント
電極をスルーホールを介して電気接続するととも
に、スルーホールを挟む外部接続側と反対側のリ
ード線部を浮遊静電容量補正用静電容量としたの
で、セグメント電極自体のサイズを調整するとい
つた面倒な操作を必要とすることなく、各セグメ
ント電極間での静電容量のばらつきを補正するこ
とができて高い精度で液深を測定することができ
る。(Effects) As described above, according to the present invention, a plurality of segment electrodes are provided at intervals in the vertical direction on one surface of an electrically insulating substrate, and at least a plurality of segment electrodes are provided on the other surface of the electrically insulating substrate. A lead wire portion having a length extending over the upper and lower ends is formed in a number equal to or greater than the number of the segment electrodes, and one segment electrode is electrically connected to one lead wire through a through hole, and a wire portion opposite to the external connection side sandwiching the through hole is formed. Since the side lead wire part has a capacitance for correcting stray capacitance, variations in capacitance between each segment electrode can be eliminated without the need for troublesome operations such as adjusting the size of the segment electrode itself. can be corrected and the liquid depth can be measured with high accuracy.
第１図イ〜ハは、それぞれ本発明の第１の実施
例を示す液深測定電極基体の正面図、背面図及び
断面図、第２図イ，ロは、それぞれ本発明の第２
の実施例をなす液深測定電極基体の正面図と断面
図、第３，４図は、それぞれ第１，２図に示した
電極基体を用いた液深測定電極棒の実施例を示す
装置の断面図、第５図は、従来の液深測定電極の
一例示す側面図である。
１……絶縁基板、２ａ〜２ｇ……間隙、３ａ〜
３ｈ……セグメント電極パターン、４ａ〜４ｈ，
４a′〜４h′……リード線パターン、５ａ〜５ｈ…
…スルーホール。
1A to 1C are a front view, a back view, and a cross-sectional view of a liquid depth measuring electrode base, respectively, showing a first embodiment of the present invention, and FIGS.
Figures 3 and 4 are a front view and a sectional view of a liquid depth measuring electrode base according to an embodiment of the present invention, and Figures 3 and 4 are diagrams of an apparatus showing an example of a liquid depth measuring electrode rod using the electrode base shown in Figures 1 and 2, respectively. The sectional view and FIG. 5 are side views showing an example of a conventional liquid depth measuring electrode. 1...Insulating substrate, 2a-2g...Gap, 3a-
3h...Segment electrode pattern, 4a to 4h,
4a' to 4h'...Lead wire pattern, 5a to 5h...
...Through hole.
Claims (1)
設けて複数のセグメント電極を、また前記電気絶
縁基板の他方の面に少なくとも前記セグメント電
極の上下端に及ぶ長さのリード線部を前記セグメ
ント電極の数以上形成し、１本のリード線に１つ
のセグメント電極をスルーホールを介して電気接
続するとともに、前記スルーホールを挟む外部接
続側と反対側のリード線部を浮遊静電容量補正用
静電容量とした液深測定用電極。1 A plurality of segment electrodes are provided at intervals in the vertical direction on one surface of the electrically insulating substrate, and a lead wire portion having a length extending at least to the upper and lower ends of the segment electrodes is provided on the other surface of the electrically insulating substrate. One segment electrode is electrically connected to one lead wire via a through hole, and the lead wire portion on the side opposite to the external connection side across the through hole is used for stray capacitance correction. Electrode for liquid depth measurement using capacitance.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59048492A JPS60192228A (en) | 1984-03-14 | 1984-03-14 | Electrode for measuring liquid depth |
| US06/709,165 US4601201A (en) | 1984-03-14 | 1985-03-07 | Liquid level and quantity measuring apparatus |
| CA000476243A CA1223460A (en) | 1984-03-14 | 1985-03-11 | Liquid level and quantity measuring apparatus |
| DE8585301714T DE3576199D1 (en) | 1984-03-14 | 1985-03-13 | MEASURING APPARATUS FOR LIQUID LEVEL AND QUANTITY OF LIQUID. |
| DK115585A DK163380C (en) | 1984-03-14 | 1985-03-13 | APPLICATION FOR MEASURING LEVEL AND VOLUME |
| EP85301714A EP0155179B1 (en) | 1984-03-14 | 1985-03-13 | Liquid level and quantity measuring apparatus |
| ES541652A ES8608154A1 (en) | 1984-03-14 | 1985-03-13 | Liquid level and quantity measuring apparatus. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59048492A JPS60192228A (en) | 1984-03-14 | 1984-03-14 | Electrode for measuring liquid depth |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60192228A JPS60192228A (en) | 1985-09-30 |
| JPH0371055B2 true JPH0371055B2 (en) | 1991-11-11 |
Family
ID=12804879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59048492A Granted JPS60192228A (en) | 1984-03-14 | 1984-03-14 | Electrode for measuring liquid depth |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60192228A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2660517B2 (en) * | 1987-10-02 | 1997-10-08 | 株式会社ノーケン | Capacitive level sensor |
| KR20040045068A (en) * | 2002-11-22 | 2004-06-01 | 현대자동차주식회사 | Fuel sender appraising method |
| JP6132960B1 (en) * | 2016-05-30 | 2017-05-24 | ニシム電子工業株式会社 | Water level measuring device and calibration method thereof |
| JP6132961B1 (en) * | 2016-05-30 | 2017-05-24 | ニシム電子工業株式会社 | Water level measuring device |
| US20200072651A1 (en) * | 2018-08-30 | 2020-03-05 | Sensata Technologies, Inc. | Fluid level sensor apparatus with inter-digitated planr capacitors for directly inserting into a fluid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53135363A (en) * | 1977-04-30 | 1978-11-25 | Eastern Eng Kk | Electronic meter for liquid level and volume measurements |
| JPS55119018A (en) * | 1979-03-05 | 1980-09-12 | Vdo Schindling | Capacitanceetype liquid level measuring device |
-
1984
- 1984-03-14 JP JP59048492A patent/JPS60192228A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53135363A (en) * | 1977-04-30 | 1978-11-25 | Eastern Eng Kk | Electronic meter for liquid level and volume measurements |
| JPS55119018A (en) * | 1979-03-05 | 1980-09-12 | Vdo Schindling | Capacitanceetype liquid level measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60192228A (en) | 1985-09-30 |
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