JPH045336B2 - - Google Patents
Info
- Publication number
- JPH045336B2 JPH045336B2 JP60217836A JP21783685A JPH045336B2 JP H045336 B2 JPH045336 B2 JP H045336B2 JP 60217836 A JP60217836 A JP 60217836A JP 21783685 A JP21783685 A JP 21783685A JP H045336 B2 JPH045336 B2 JP H045336B2
- Authority
- JP
- Japan
- Prior art keywords
- level
- liquid
- temperature
- voltage
- 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.)
- Expired - Lifetime
Links
- 239000007791 liquid phase Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 9
- 239000012071 phase Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 1
- 238000012546 transfer Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、槽内の液体と気体のように熱伝達率
に差異のある二相の界面を測定する方法および装
置に係わり、特に、高粘度、高温での液面レベル
測定に適するレベル測定方法および装置に関する
ものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method and apparatus for measuring the interface between two phases having different heat transfer coefficients, such as a liquid and a gas in a tank. The present invention relates to a level measuring method and device suitable for measuring liquid level at high temperatures.
従来の液面レベルを検知する方法は、エレクト
ロニクスインダストリー（ELECTRONICS
INDUSTRY）MARCH 1980VOL.6No.
3PAGE37、39に記載されているように、サーミ
スター（THERMISTOR）に定電圧を印加して、
サーミスターに接触する媒体（水とか、空気）の
熱伝達の差によつて生じるサーミスターの温度変
化（＝抵抗値変化）を電流値の変化で監視するこ
とによつて液面レベルの変化を検知するようにな
つていた。
The traditional method of detecting liquid level is based on the electronics industry (ELECTRONICS
INDUSTRY）MARCH 1980VOL.6No.
As described on 3PAGE37, 39, by applying a constant voltage to the thermistor,
Changes in the liquid level can be detected by monitoring the temperature change (= resistance value change) of the thermistor caused by the difference in heat transfer between the medium (water, air, etc.) in contact with the thermistor by the change in current value. It was beginning to be detected.
しかしながら、この方法では、レベルスイツチ
として作用するのみで、レベルの連続測定という
点については考慮されていなかつた。 However, this method only functions as a level switch and does not take into account continuous level measurement.
本発明の目的は、槽の運転条件（温度、圧力、
振動等）の変動に対して、常に正確な液面の連続
測定のできる信頼性および制度の高いレベル測定
方法および装置を提供することにある。
The purpose of the present invention is to
The object of the present invention is to provide a highly reliable and accurate level measuring method and device that can always accurately and continuously measure the liquid level despite fluctuations in vibrations, etc.).
本発明は、槽内に挿入され吉の抵抗値を有する
低抗体を内包し、液相レベル面とエレメントの節
液面とが比例関係にあるレベル測定用エレメント
に供給される電気的エネルギーを電流と電圧とで
検出すると共に、槽内の液温を検出し、レベル測
定用エレメントが液温より一定温度だけ高い温度
になるように演算し、該演算結果に基づいてレベ
ル測定用エレメントに供給する電気エネルギーを
供給電圧の増減で調節することにより、該電気的
エネルギーと液相レベルとが比例関係となる減少
を利用して、該電気的エネルギーの大きさにより
液相レベルの連続測定を行なうようにしたもので
ある。
In the present invention, electrical energy is supplied to a level measuring element which is inserted into a tank, contains a low antibody having a suitable resistance value, and has a proportional relationship between the liquid phase level surface and the liquid nodal surface of the element. and voltage, and also detects the liquid temperature in the tank, calculates so that the level measuring element becomes a certain temperature higher than the liquid temperature, and supplies it to the level measuring element based on the calculation result. By adjusting the electrical energy by increasing or decreasing the supply voltage, the proportional relationship between the electrical energy and the liquid phase level is utilized to continuously measure the liquid phase level based on the magnitude of the electrical energy. This is what I did.
以下、本発明の一実施例を第１図、第２図を用
いて説明する。第１図は実施例の構成を示すもの
で、１は槽を示し、２は液相部、３は気相部を示
す。４は槽１内に縦向き挿入されたレベル測定用
エレメント（以下、エレメントと略す）で、既知
の抵抗値を持つ低抗体を内包している。５は外部
接続用の端子箱、６および７はエレメント４の低
抗体に供給される電流および電圧を検出する電流
検出器および電圧検出器、８は電源装置で、調節
計１２からの出力信号によつて、エレメント４に
供給する電圧を増減する機能を有する。９は電源
装置８に供給される外部からの電源、１０は槽１
内の液温を検出する液温検出器、１１は電流検出
器６からの電流値、電圧検出器７からの電圧値お
よび液温検出器１０からの温度値を入力し、各種
演算を行ない、レベル表示およびエレメント４と
液温検出器１０からの温度偏差を調節計１２に出
力する機能を有する演算処理装置を示す。
An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows the structure of the embodiment, in which 1 represents a tank, 2 represents a liquid phase portion, and 3 represents a gas phase portion. 4 is a level measuring element (hereinafter abbreviated as element) inserted vertically into the tank 1 and contains a low antibody having a known resistance value. 5 is a terminal box for external connections; 6 and 7 are current detectors and voltage detectors that detect the current and voltage supplied to the low antibody of element 4; 8 is a power supply device, which is connected to the output signal from the controller 12; Therefore, it has the function of increasing or decreasing the voltage supplied to the element 4. 9 is an external power supply supplied to the power supply device 8; 10 is the tank 1;
A liquid temperature detector 11 for detecting the liquid temperature in the liquid temperature detector 11 inputs the current value from the current detector 6, the voltage value from the voltage detector 7, and the temperature value from the liquid temperature detector 10, and performs various calculations. 1 shows a processing unit having a function of displaying a level and outputting temperature deviations from an element 4 and a liquid temperature detector 10 to a controller 12.
上述の構成において、液相レベル測定方法につ
いて説明する。 In the above-described configuration, a method of measuring the liquid phase level will be explained.
まず、エレメント４は、液温検出器１０より△
Ｔだけ高い温度になるように、電源装置８の出力
電圧が調節されている状態では、以下の関係が成
立する。 First, the element 4 detects △ from the liquid temperature detector 10.
In a state where the output voltage of the power supply device 8 is adjusted so that the temperature becomes higher by T, the following relationship holds true.
R1＝K1・（Ｉ・Ｖ−I2・RA） ……(1)
P2＝△Ｔ・AL・UL＋△Ｔ・AG・UG ……(2)
ここで、
P1：入力エネルギー
P2＝電熱量
Ｉ：電流値(A)
K1＝係数＝0.0011628（kcal／KWH）
Ｖ：電圧値（Ｖ）
RA：電流検出器６の内部抵抗値（Ω）
△Ｔ：温度偏差＝TE−TL＝TE＋TG（℃）
TE：エレメント４温度（℃）
TL：液相部２温度（℃）
TG：気相部３温度（℃）
AE：エレメント４表面積＝AL＋AG（m2）
AL：エレメント４と液相部２の接液面積（m2）
AG：エレメント４と気相部３の接触面積（m2）
UL：エレメント４と液相部２との総括伝熱係数
（kcal／m2・Ｈ・℃）
UG：エレメント４と気相部３との総括伝熱係数
（kcal／m2・Ｈ・℃）
また、エレメント４に入力された電気的エネル
ギーP1と、エレメント４から伝熱により液相部
２、気相部３に移動した熱量P2とは等しい。 R 1 = K 1・(I・V−I 2・R A ) ……(1) P 2 =△T・AL・U L +△T・A G・U G ……(2) Here, P 1 : Input energy P 2 = Electric heat amount I: Current value (A) K 1 = Coefficient = 0.0011628 (kcal/KWH) V: Voltage value (V) R A : Internal resistance value of current detector 6 (Ω) △T : Temperature deviation = T E - T L = T E + T G (℃) T E : Element 4 temperature (℃) T L : Liquid phase part 2 temperature (℃) T G : Gas phase part 3 temperature (℃) A E : Surface area of element 4 = A L + A G (m 2 ) A L : Contact area of element 4 and liquid phase part 2 (m 2 ) A G : Contact area of element 4 and gas phase part 3 (m 2 ) U L : Overall heat transfer coefficient between element 4 and liquid phase 2 (kcal/m 2・H ・℃) U G : Overall heat transfer coefficient between element 4 and gas phase 3 (kcal/m 2・H ・℃) Further, the electrical energy P 1 input to the element 4 is equal to the amount of heat P 2 transferred from the element 4 to the liquid phase portion 2 and the gas phase portion 3 by heat transfer.
P1＝P2＝Ｐ ……(3)
上記(1)、(2)、(3)式から
(2)式は、
P2＝△Ｔ・AL・UL＋△Ｔ・（AE−AL）・UG
＝△Ｔ・AL・（UL−UG）＋△Ｔ・AE・UG
ここで、
△Ｔ・（UL−UG）＝C1（CONSTANT）
△Ｔ・AE・UG＝C2（CONSTANT）
Ｐ＝AL・C1＋C2……(4)となり、エネ
ルギーＰはALの１次関数となり、ＰからALを求
めることができる。 P 1 = P 2 = P ...(3) From equations (1), (2), and (3) above, equation (2) is: P 2 = △T・A L・U L +△T・(A E −A L )・U G = △T・A L・(U L −U G )＋△T・A E・U GHere , △T・(U L −U G )=C 1 (CONSTANT) △ T・A E・U G =C 2 (CONSTANT) P=A L・C 1 +C 2 (4), and the energy P becomes a linear function of A L , and A L can be found from P.
しかして、ALと液相レベルとが比例関係とな
るようなエレメント４の形状を選定する（例えば
円筒形等）ことにより、(1)式は、測定により既知
であり、(3)式によつて液相レベルを求めることが
できる。 By selecting the shape of element 4 such that A L and the liquid phase level are in a proportional relationship (for example, cylindrical, etc.), equation (1) is known through measurement, and equation (3) can be Therefore, the liquid phase level can be determined.
つぎに、演算処理装置１１の機能について説明
すると
() 入力処理機能
(1) 電流値 Ｉ
(2) 電圧値 Ｖ
(3) 液相部温度 TL
() 演算処理機能
(1) 温度偏差 △Ｔ＝TE−TL ……(5)
ここで、エレメント４の温度TEは下記演
算によつて算出する。 Next, the functions of the arithmetic processing unit 11 will be explained: () Input processing function (1) Current value I (2) Voltage value V (3) Liquid phase temperature T L () Arithmetic processing function (1) Temperature deviation △T =T E −T L (5) Here, the temperature T E of the element 4 is calculated by the following calculation.
Ｒ＝Ｖ／ＩαTE ……(6)
エレメント４に内包した低抗体は、あらかじ
め温度と抵抗値の関係を求めておけば、(6)式
によつて得られた抵抗値により、エレメント
４の温度TEを求めることができる。 R=V/IαT E ……(6) If the relationship between temperature and resistance value of the low antibody contained in element 4 is determined in advance, the resistance value of element 4 can be determined by the resistance value obtained by equation (6). Temperature T E can be determined.
(2) 液相レベル (1)、(4)式から AL＝K2Ｐ−C2／C1 ……(7) ここで、K2は実験定数とする。 (2) Liquid phase level From equations (1) and (4), A L = K 2 P - C 2 /C 1 ... (7) Here, K 2 is an experimental constant.
() 出力処理機能
(1) レベル表示
(7)式によつて得られた液相レベルをデイジ
タルあるいはアナログ量として表示する。() Output processing function (1) Level display Displays the liquid phase level obtained by equation (7) as a digital or analog quantity.
(2) △Ｔ出力
(5)、(6)式によつて得られた△Ｔを調節計１
２に出力する。 (2) △T output △T obtained from equations (5) and (6) is
Output to 2.
以上の一連の処理によつて槽１内の液相レベル
を知ることができる。 Through the series of processes described above, the liquid phase level in the tank 1 can be determined.
液相レベルと入力エネルギーの関係を第２図に
示す。 Figure 2 shows the relationship between liquid phase level and input energy.
本発明によれば、槽の運転条件（温度、圧力、
振動等）の変動に対しても、常に正確な液面を連
続測定することができ、信頼性および制度の高い
液相レベルの測定方法および装置を得ることがで
きる。
According to the invention, the operating conditions of the tank (temperature, pressure,
It is possible to continuously and accurately measure the liquid level even when there are fluctuations in vibrations, etc.), and it is possible to obtain a highly reliable and accurate liquid phase level measuring method and device.
第１図は本発明の一実施例を示す液相レベル測
定装置の略図、第２図は液相レベル測定装置での
液相レベルと入力エネルギーとの関係を示す線図
である。
１……槽、２……液相部、３……気相部、４…
…レベル測定用エレメント、５……端子箱、６…
…電流検出器、７……電圧検出器、８……電源装
置、９……外部電源、１０……液温検出器、１１
……演算処理装置、１２……調節計。
FIG. 1 is a schematic diagram of a liquid phase level measuring device showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the liquid phase level and input energy in the liquid phase level measuring device. 1... Tank, 2... Liquid phase part, 3... Gas phase part, 4...
...Level measurement element, 5...Terminal box, 6...
...Current detector, 7...Voltage detector, 8...Power supply device, 9...External power supply, 10...Liquid temperature detector, 11
... Arithmetic processing unit, 12 ... Controller.
Claims (1)
を内包し、液相レベル面とエレメントの接液面と
が比例関係にあるレベル測定用エレメントに供給
される電気的エネルギーを電流と電圧とで検出す
ると共に、槽内の液温を検出し、レベル測定用エ
レメントが液温より、一定温度だけ高い温度にな
るように演算し、該演算結果に基づいてレベル測
定用エレメントに供給する電気エネルギーを供給
電圧の増減で調節し、該電気的エネルギーの大き
さより液相レベルを検知することを特徴とするレ
ベル測定方法。 ２ 液相部と気相部とを備えた槽と、抵抗体を内
包し槽内に縦向きに挿入されたレベル測定用エレ
メントと、該レベル測定用エレメントに供給され
る電気的エネルギーを検出する電流検出器および
電圧検出器と、槽内の液温を検出する液温検出器
と、前記電流検出器からの電流値、電圧検出器か
らの電圧値および液温検出器からの温度値を入力
して演算し、レベル測定用エレメントと液温検出
器からの温度偏差を調節計に出力する演算処理装
置と、調節計からの出力信号によつてレベル測定
用エレメントに供給する電圧を増減する電源装置
とからなることを特徴とするレベル測定装置。[Claims] 1. Electrical power supplied to a level measuring element which is inserted into a tank and contains a low antibody having a known resistance value, and where the liquid phase level surface and the liquid contact surface of the element are in a proportional relationship. In addition to detecting energy as current and voltage, the temperature of the liquid in the tank is also detected, the level measurement element is calculated to be a certain temperature higher than the liquid temperature, and based on the calculation result, the level measurement element is A level measuring method characterized by adjusting the electrical energy supplied to the element by increasing or decreasing the supply voltage, and detecting the liquid phase level from the magnitude of the electrical energy. 2. A tank having a liquid phase part and a gas phase part, a level measuring element containing a resistor and inserted vertically into the tank, and detecting the electrical energy supplied to the level measuring element. Input a current detector, a voltage detector, a liquid temperature detector that detects the liquid temperature in the tank, the current value from the current detector, the voltage value from the voltage detector, and the temperature value from the liquid temperature detector. A processing unit that calculates the temperature deviation from the level measurement element and the liquid temperature detector and outputs it to the controller, and a power supply that increases or decreases the voltage supplied to the level measurement element based on the output signal from the controller. A level measuring device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21783685A JPS6279318A (en) | 1985-10-02 | 1985-10-02 | Method and apparatus for measuring level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21783685A JPS6279318A (en) | 1985-10-02 | 1985-10-02 | Method and apparatus for measuring level |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6279318A JPS6279318A (en) | 1987-04-11 |
| JPH045336B2 true JPH045336B2 (en) | 1992-01-31 |
Family
ID=16710511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21783685A Granted JPS6279318A (en) | 1985-10-02 | 1985-10-02 | Method and apparatus for measuring level |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6279318A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5875029A (en) * | 1981-10-07 | 1983-05-06 | ジヤガ− | Regulator for surface of liquid in vessel |
| JPS61165518A (en) * | 1985-01-16 | 1986-07-26 | Central Res Inst Of Electric Power Ind | Method to operate slag tap furnace |
-
1985
- 1985-10-02 JP JP21783685A patent/JPS6279318A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5875029A (en) * | 1981-10-07 | 1983-05-06 | ジヤガ− | Regulator for surface of liquid in vessel |
| JPS61165518A (en) * | 1985-01-16 | 1986-07-26 | Central Res Inst Of Electric Power Ind | Method to operate slag tap furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6279318A (en) | 1987-04-11 |
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