JPS60192226A - Electrostatic capacity type level gauge - Google Patents

Electrostatic capacity type level gauge

Info

Publication number
JPS60192226A
JPS60192226A JP59048490A JP4849084A JPS60192226A JP S60192226 A JPS60192226 A JP S60192226A JP 59048490 A JP59048490 A JP 59048490A JP 4849084 A JP4849084 A JP 4849084A JP S60192226 A JPS60192226 A JP S60192226A
Authority
JP
Japan
Prior art keywords
segment
electrode
liquid level
liquid
electrostatic capacity
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
Application number
JP59048490A
Other languages
Japanese (ja)
Inventor
Keizo Endo
遠藤 景三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Tatsuno Co Ltd
Original Assignee
Tokyo Tatsuno Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Tatsuno Co Ltd filed Critical Tokyo Tatsuno Co Ltd
Priority to JP59048490A priority Critical patent/JPS60192226A/en
Publication of JPS60192226A publication Critical patent/JPS60192226A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating 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
    • G01F23/26Indicating 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
    • G01F23/263Indicating 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

Abstract

PURPOSE:To correct fluctuations of electrostatic capacity characteristics, by dividing a liquid depth measuring electrode rod into plural segment electrodes and finding data on the liquid quantity based on the liquid level-electrostatic capacity characteristic of each segment electrode stored in advance. CONSTITUTION:Segment electrodes 5a-5d are formed on the surface of a segment electrode constituting body 4 with spaces between them in the vertical direction. An insulating substrate 7 with lead wires 6a-6d to be connected with each segment electrode being formed on one surface is wound around an electrically insulating cylindrical core material 8. After winding the insulating substrate 7 an insulating cover 9 is put on the substrate 7 and they are united in one body. A common electrode 10 is fitted to the body 4 so that its oil inlets 12 and flow switches 13a-13c can meet the gaps 11a-11c of the segment electrodes 5a-5d. The flow switches 13a-13c are turned on or off when oil surface rises or drops to levels coincident with the gaps 11a-11c of the segment electrodes 5a-5c, and arrival of the oil surface to a reference level is detected.

Description

【発明の詳細な説明】 (技術分野) 本発明は、静′逝容量式液面計に関する。[Detailed description of the invention] (Technical field) The present invention relates to a static displacement type liquid level gauge.

(従来技術) 地Fタンク等に収容された燃料油量の残量は、タンクの
1一部から底部に亘る長さを持った同軸状の11^極か
らなる静電容酸測定棒を用い、この電極の静゛71を容
量が液面レベルに比例して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 the ground F tank, etc. is measured using a capacitive acid measuring rod consisting of a coaxial 11^ pole with a length extending from one part of the tank to the bottom. Measurement is performed by utilizing the fact that the capacitance of this electrode changes in proportion to the liquid level.

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か変化し易く、測定値に大きな誤
差を含むという不都合がある。
Incidentally, the dielectric constant of the fuel oil stored in the tank tends to change due to the influence of the outside temperature, and there is a disadvantage that the measured value includes a large error.

このような不都合を解消するため、第6図にポしたよう
に液深測定電極を上下刃向に複数に分7−i11してセ
グメント電極A、−A5を形成し、電極の切れ口B1〜
B4に合せてフロー−スイッチLS。
In order to eliminate this inconvenience, as shown in Fig. 6, the liquid depth measuring electrode is divided into a plurality of segments 7-i11 in the upper and lower blade directions to form segment electrodes A and -A5, and the cut ends of the electrode are B1 to B1.
Flow switch LS to match B4.

〜LS4を設けたディジタル・アナログをの静電界ψ式
液面計が提案されている。
A digital/analog electrostatic field ψ type liquid level gauge equipped with ~LS4 has been proposed.

これによれは、フロートスイッチを基べらレベルとして
セグメン+−′;ti極による測定値を校Il−するこ
とができて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。
Accordingly, the value measured by the segment +-';ti pole can be calibrated using the float switch as a base level, and measurement errors due to changes in outside temperature can be reduced.

しかし、反面、セグメント電極ごとの!rZ面レベルー
静電容量特性にバラつきがあるため、セグメント電極間
土間で71111定値が異なり、結果として4111定
誤差が大きくなるという新たな問題かある。
However, on the other hand, each segment electrode! Since there are variations in the rZ surface level-capacitance characteristics, the 71111 constant value differs between the segment electrodes and the dirt floor, resulting in a new problem that the 4111 constant error increases.

(目的) 本発明はこのような問題に鑑み、各セグメント電極t極
の静電容量特性のパラつきを補正して液面しベルを正確
に測定することができる静電容量式液[荀計を提供する
ことを目的とする。
(Purpose) In view of these problems, the present invention has developed a capacitive liquid [Xuankei] that can accurately measure the liquid level by correcting variations in the capacitance characteristics of each segment electrode t-pole. The purpose is to provide

(発明の明示) すなわち、本発明の特徴とするところは、複数のセグメ
ント電極の切れ目に液面レベルが到達したことを検出す
る基準レベル検出手段と、基準レベル検出手段からの信
号によりセグメント′屹極ごとの液面レベル−静電容量
特性を選釈して液量データを算出する手段を設けた点に
ある。
(Clarification of the Invention) In other words, the present invention is characterized by: a reference level detection means for detecting that the liquid level has reached the break between a plurality of segment electrodes; The point is that a means is provided for calculating liquid volume data by interpreting the liquid level-capacitance characteristics for each pole.

(構成) そこで、以下に本発明の詳細を図示した実施例に基つい
て説明する。
(Structure) Therefore, the details of the present invention will be described below based on illustrated embodiments.

第1図は、本発明の実施例を示す装置の構成図であって
、図中符号1は、地下タンク等の燃料油貯蔵槽Tに垂設
したセグメント電極からなる液深測定電極棒で、測定ケ
ーブル2を介してモニター装置3に接続し、貯蔵槽T内
の燃料油の残量をディジタル表示するように構成されて
いる。
FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention, and reference numeral 1 in the figure is a liquid depth measuring electrode consisting of a segment electrode vertically installed in a fuel oil storage tank T such as an underground tank. It is connected to a monitor device 3 via a measurement cable 2, and is configured to digitally display the remaining amount of fuel oil in the storage tank T.

第2図は、」一連の液深測定電極棒の実施例を示すもの
であって、図中符号4は、セグメント電極構成体で、表
面にセグメント電極5a、5b、5c、5dを」−下方
向に間隔をあけて形成し、他面に各セグメント電極と接
続するリード線6a、6b、6C56dを形成した絶縁
基板7を電気絶縁性円筒状芯材8の表面に巻付け、絶縁
カバー9を覆せて一体化して構成されている。10は、
共通電極で、内部に同軸状にセグメント′電極構成体4
を収容するとともに、セグメント電極のすJれ1111
a−11cに一致させて油流入1」12.12.12を
穿設した金属製パイプからなり、外周にセグメント電極
の切れ口11a−11cに一致させてフローI・スイッ
チ13a〜13cを配設して構成されている。このフロ
ートスイッチL3a〜13cは、油面がセグメント電極
のすJれ目11a〜llcに一致するレベルにまで−に
昇、または降下したとき0N−OFFL、油面が基準レ
ベルに到達したことを検出し又後述するモニター装置に
信号を出力する基準レベル検出器を構成している。14
は、データ発信器で、合成樹脂15によりモールドされ
て共通電極10を形成する金属パイプの上部に収容され
、セグメント電極5a〜5dからのリード線6a〜6d
及び共通電極10に接続されている。
FIG. 2 shows an embodiment of a series of liquid depth measuring electrode rods, in which reference numeral 4 is a segment electrode structure, on the surface of which segment electrodes 5a, 5b, 5c, and 5d are attached. An insulating substrate 7 formed at intervals in the direction and having lead wires 6a, 6b, 6C56d formed on the other side to connect to each segment electrode is wound around the surface of an electrically insulating cylindrical core material 8, and an insulating cover 9 is attached. It is composed of an integrated structure that can be reversed. 10 is
Segment 'electrode structure 4 coaxially inside the common electrode
1111 of the segment electrode.
It consists of a metal pipe with an oil inflow 1" 12.12.12 drilled in line with a-11c, and flow I/switches 13a to 13c are arranged on the outer periphery in line with segment electrode cuts 11a-11c. It is configured as follows. These float switches L3a to 13c are 0N-OFF when the oil level rises or falls to a level that matches the segment electrode gaps 11a to llc, and detects that the oil level has reached the reference level. It also constitutes a reference level detector that outputs a signal to a monitor device to be described later. 14
is a data transmitter, which is housed in the upper part of a metal pipe molded with synthetic resin 15 and forming the common electrode 10, and has lead wires 6a to 6d from segment electrodes 5a to 5d.
and is connected to the common electrode 10.

なお、図中符号16は、液深測定電極棒と延長パイプ1
7を接続する継手を示している。
In addition, the reference numeral 16 in the figure indicates the liquid depth measuring electrode rod and the extension pipe 1.
7 is shown.

第3図は、測定回路の実施例を示すもので、図中符号1
4は、前述しだ液深測定電極棒に収容されているデータ
発信器で、モニター装置3からの制御信壮により0N−
OFFするサンプリングリレー14a〜14dと、これ
を介して各セグメント電極5a〜5dに接続するLC発
信器14eからなり、セグメント電極の静電容量値を周
波数11:弓に変換してモニター装置3に出力するよう
に構成されている。3は、前述のモニター装置でフロー
トスイッチ13a−13cからの液面基準レベル信号、
データ発信器14からの周波数倍りと、リレーの制御信
号が入出力するI10インタフェイス3aと、セグメン
ト電極ごとの静電界1−−液面レベル特性、静電容量式
液量特性及び演算プログラムを格納する記憶回路3bと
、このプログラムと110インターフエイス3aからの
データに基づいて液量(K文)を算出するマイクロプロ
セッサ3Cと、クロ・ンク発振器3dと、これからの出
力を表示する表示計3eとの1ら構成されている。
Fig. 3 shows an embodiment of the measuring circuit, and the reference numeral 1 in the figure shows an embodiment of the measuring circuit.
4 is a data transmitter housed in the electrode rod for measuring the depth of saliva;
It consists of sampling relays 14a to 14d that turn off, and an LC transmitter 14e connected to each segment electrode 5a to 5d via this, converts the capacitance value of the segment electrode to a frequency of 11: bow, and outputs it to the monitor device 3. is configured to do so. 3 is a liquid level reference level signal from the float switches 13a to 13c in the above-mentioned monitor device;
The frequency doubling from the data transmitter 14, the I10 interface 3a where relay control signals are input/output, and the electrostatic field 1 for each segment electrode - liquid level characteristics, capacitive liquid volume characteristics, and calculation program. A memory circuit 3b for storing data, a microprocessor 3C for calculating the liquid volume (K statement) based on this program and data from the 110 interface 3a, a clock oscillator 3d, and a display meter 3e for displaying future output. It consists of 1 and 1.

次に、このように構成した装置の動作をNJr 41Δ
に示したフローチャートに基づuXて説明する。
Next, the operation of the device configured in this way is expressed as NJr 41Δ
This will be explained based on the flowchart shown in .

ノ夜探測定電極棒をタンクに設置して装置を1′「動す
ると、フロートスイッチ13a−13cの内、!イセ面
の下に存在するスイ、7チ、例え(オフロートスイッチ
13bがONの状yハ(となって信はを114ツノする
。この信−りによりモニター装置ζ±、ル−チン11を
選釈してデータ発信器14のサンプIJング゛IJレー
14cをONとしてセグメント電極電極5Cの+’+争
電容量(Hに基づイ周波数信号の計数を1)FllIi
ロ〜サンプリング時間Tの経過後にこのサンプ1ノンク
゛1)レー14cをOFFとする。
When the night probe measurement electrode is installed in the tank and the device is moved 1', among the float switches 13a-13c, the switch 7, which exists under the ! In this state, a signal is generated at 114. Based on this signal, the monitor device ζ± selects the routine 11, turns on the sampling IJ relay 14c of the data transmitter 14, and turns on the segment electrode. +'+ competitive capacitance of electrode 5C (counting frequency signal 1 based on H)FllIi
After the sampling time T has elapsed, the sampling 1 non-quadrature 14c is turned off.

言うまでもなく、このサブリング゛よりtltられた周
波数信号は、セグメント電極−5cをii 4s’i 
している液面レベルに基づくデータである力1ら、′″
tめ記憶回路3bに格納されているセグメント電極5C
の静電容量−液面レベル特性によりセグメン+−’rc
極の容−・υ特性のバラツキが補jEされてjJ二確な
液面レベル値に変換される。この液面レベル値は、フロ
ートスイッチ13bが設けられているタンク底面からの
高さ、つまりフロートスイッチ13bの液面レベルに加
算されて絶対液面レベルに変換され、ついで記憶回路3
bに格納されている液面レベル−液量特性により液は(
k文)に換算されて表示計38に表示される。このよう
にして液面レベルが検出されて液量が表示される。そし
て液面が電極5Cの範囲に存在する間は、モニター装置
はサンプリングリレー14cを再び作動してこの電極5
Cの静電容量値をサンプリングし、tj室を前句表示す
る。
Needless to say, the frequency signal transmitted from this sub-ring is applied to the segment electrode -5c from ii to 4s'i.
Force 1, which is data based on the liquid level
Segment electrode 5C stored in the tth memory circuit 3b
Due to the capacitance-liquid level characteristics of the segment +-'rc
Variations in the capacitance and υ characteristics of the poles are compensated for and converted into an accurate liquid level value. This liquid level value is added to the height from the bottom of the tank where the float switch 13b is installed, that is, the liquid level of the float switch 13b, and converted to an absolute liquid level.
The liquid is (
k sentences) and displayed on the display total 38. In this way, the liquid level is detected and the liquid amount is displayed. While the liquid level is within the range of the electrode 5C, the monitoring device again activates the sampling relay 14c to
Sample the capacitance value of C and display the tj chamber in the previous phrase.

このようにして、タンク内の燃料油が消費が進んで、液
面レベルがフロートスイッチ13bのレベルを下回ると
、フロートスイッチは、直ちにOFFとなって信号を出
力する。この信号は、モニター装置3に入力してセグメ
ント電極5Cに接続するリレーを不作動と゛し、同時に
ルーチンIIIを選択してサンプリングリレー14bを
作動し、セグメント’m8i5 bからの静電界−1a
、値のサンプリングを行なってセグメント電極5bでの
液面レベルによる静電容量値を測定し、記憶回路3bに
格納されているセグメント電極5bの静電界::’+l
 :#’j ir+iレベル特性に基づいて相対液面レ
ベルをめる。
In this manner, when the fuel oil in the tank is consumed and the liquid level falls below the level of the float switch 13b, the float switch immediately turns OFF and outputs a signal. This signal is input to the monitor device 3 to deactivate the relay connected to the segment electrode 5C, and at the same time selects routine III to activate the sampling relay 14b, thereby suppressing the electrostatic field -1a from the segment 'm8i5b.
, the value is sampled to measure the capacitance value according to the liquid level at the segment electrode 5b, and the electrostatic field of the segment electrode 5b stored in the memory circuit 3b is::'+l
:#'j Calculate the relative liquid level based on the ir+i level characteristics.

この相対液面レベルは、フロートスイッチ13aが配置
された液面レベルに加算され、ついで4イkllシ(K
M)に換算される。以後、このようにしてIイタ面レベ
ル直下に配設されているフロートスイッチを基樵点とし
、これより」一方の液面レベル分だけをセグメント電極
により検出する。
This relative liquid level is added to the liquid level at which the float switch 13a is located, and then 4 kll (K
M). Thereafter, the float switch disposed just below the level of the I-plane is used as the reference point, and from this point only one liquid level is detected by the segment electrode.

なお、」−述の動作説明においては、タンク内の燃料?
d+が消費される場合に例を採ったか、タンクローりか
ら給油を受けて燃料油が増加する場合についても同様な
動作により液面を連続的に測定できることは言うまでも
ない。
In addition, in the explanation of operation mentioned above, the fuel in the tank?
It goes without saying that the liquid level can be continuously measured by the same operation as in the case where d+ is consumed, or when the fuel oil increases due to refueling from a tank truck.

なお、この実施例においては、基準レベルの検知をフロ
ートスイッチにより行なうように17ているが、セグメ
ント電極の切れ口ご゛とにリミットスイッチを配設し、
これを液面の−[−下動に追従するフロートにより作動
させたり、またセグメント電極の切れ目に液面が到達し
たときに生じるセグメント71i極からの信号の不連続
性を検知しても同様な作用を奏する。
In this embodiment, the reference level is detected by a float switch 17, but a limit switch is provided at each cut end of the segment electrode.
The same effect can be achieved by operating this with a float that follows the -[- downward movement of the liquid level, or by detecting the discontinuity of the signal from the segment 71i pole that occurs when the liquid level reaches the break in the segment electrode. play an action.

(効果) 以L、説明したように本発明によれば、液深測定電極棒
を複数のセグメント電極に分割して形成し、予しめ格納
されている各セグメンI・電極の鹸面しベルー静′屯容
量−特性に基づいて液量データをめるようにしたので、
セグメント電極間の静電容r4特性のバラツキを補正す
ることができ、いわゆるディジタル・アナログ型液面計
の利点、つまり11、N度変化にノ1(づく誤差が軽減
できるという利点を牛しつつ、J&、量を正確に411
1定することができるはかりでなく、液深測定電極棒の
製作にあたっては寸法粘度を必要とせずコストを下げる
ことができる。
(Effects) As described below, according to the present invention, the liquid depth measuring electrode rod is formed by dividing it into a plurality of segment electrodes, and the surface of each segment I/electrode stored in advance is Since the liquid volume data is calculated based on the ton capacity characteristic,
It is possible to correct the variation in the capacitance r4 characteristics between the segment electrodes, and while taking advantage of the advantage of so-called digital/analog type liquid level gauges, that is, the error caused by 11.N degree change can be reduced, J&, exactly the amount 411
It is not a scale that can be fixed at one time, and when manufacturing a liquid depth measuring electrode rod, dimensional viscosity is not required and costs can be reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明の概要を示す装置の構成図。 第2図は、同上装置における液深測定電極棒の一実施例
を示す断面図、第3図は、同]−装置における電気回路
の一実施例を示す装置のブロック図、第4図は、同一1
−装置の動作を示すフローチセート、第5図は、従来の
静電界1□)液面計のセグメント電極の一例を示す斜視
図である。 ■・・・・油深4111定電極杯 3・・・・モニター
装]°ざ15a〜5d・・・・セグメント電極 lO・・・・共通゛電極 11a〜lie・・・・しJれ目 13a〜13c・・・・フローI・スイッチ14・・・
・データ発信器 出願人 株式会社 東京タンク 代理人 弁理士 西 川 1票 冶 旨J 文i) ノ Lン) 9 第2日
FIG. 1 is a configuration diagram of an apparatus showing an outline of the present invention. FIG. 2 is a sectional view showing an embodiment of the liquid depth measuring electrode rod in the above device, FIG. 3 is a block diagram of the device showing an embodiment of the electrical circuit in the same device, and FIG. Same 1
FIG. 5 is a perspective view showing an example of a segment electrode of a conventional electrostatic field 1□) liquid level gauge. ■...Oil depth 4111 Constant electrode cup 3...Monitor equipment]° 15a-5d...Segment electrode lO...Common electrode 11a-lie...J-eye 13a ~13c...Flow I switch 14...
・Data Transmitter Applicant Tokyo Tank Co., Ltd. Agent Patent Attorney Nishikawa 1 vote Jigiri J I) ノ Ln) 9 2nd day

Claims (1)

【特許請求の範囲】[Claims] 複数のセグメント電極1を間隔を稍たせて上下関係に配
設してなる液深測定手段、前記セグメント゛iΣ極の電
極間に液面レベルが到達したことを検出する手段、及び
該手段からの信号により対応するセクメンIパ市極の液
[mレベル−静電容は特性データを選択して液面レベル
をめる手段からなる静゛屯容量式液面計。
A liquid depth measuring means formed by arranging a plurality of segment electrodes 1 in a vertical relationship with slight intervals, a means for detecting that the liquid level has reached between the electrodes of the segment iΣ pole, and a signal from the means. A static capacitive liquid level gauge consisting of a means for determining the liquid level by selecting characteristic data.
JP59048490A 1984-03-14 1984-03-14 Electrostatic capacity type level gauge Pending JPS60192226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59048490A JPS60192226A (en) 1984-03-14 1984-03-14 Electrostatic capacity type level gauge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59048490A JPS60192226A (en) 1984-03-14 1984-03-14 Electrostatic capacity type level gauge

Publications (1)

Publication Number Publication Date
JPS60192226A true JPS60192226A (en) 1985-09-30

Family

ID=12804825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59048490A Pending JPS60192226A (en) 1984-03-14 1984-03-14 Electrostatic capacity type level gauge

Country Status (1)

Country Link
JP (1) JPS60192226A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040045068A (en) * 2002-11-22 2004-06-01 현대자동차주식회사 Fuel sender appraising method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5059058A (en) * 1973-09-22 1975-05-22
JPS518966A (en) * 1974-06-10 1976-01-24 Nabarutoronitsuku As
JPS58186017A (en) * 1982-04-26 1983-10-29 Hitachi Ltd Level indicating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5059058A (en) * 1973-09-22 1975-05-22
JPS518966A (en) * 1974-06-10 1976-01-24 Nabarutoronitsuku As
JPS58186017A (en) * 1982-04-26 1983-10-29 Hitachi Ltd Level indicating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040045068A (en) * 2002-11-22 2004-06-01 현대자동차주식회사 Fuel sender appraising method

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