CN101566491A - Method and system for measuring liquid level of conductive liquid - Google Patents
Method and system for measuring liquid level of conductive liquid Download PDFInfo
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- CN101566491A CN101566491A CNA2009100503438A CN200910050343A CN101566491A CN 101566491 A CN101566491 A CN 101566491A CN A2009100503438 A CNA2009100503438 A CN A2009100503438A CN 200910050343 A CN200910050343 A CN 200910050343A CN 101566491 A CN101566491 A CN 101566491A
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Abstract
The invention relates to a method and a system for measuring liquid level of a conductive liquid. The invention adopts a method for measuring the liquid level of the conductive liquid, comprising a conductive liquid with a measured liquid level H changing between a low liquid level H1 and a high liquid level H2, a liquid container, a measurement electrode, a signaling electrode and a reference electrode that are contacted with the liquid; the measurement electrode is arranged between the signaling electrode and the reference electrode in the horizontal direction; the horizontal height of the signaling electrode is lower than the low liquid level H1; an electric signal X1 with the voltage amplitude V1 is applied between the signaling electrode and the reference electrode; the electric signal X1 is coupled by the liquid; and the electric signals X2 at two ends of the measurement electrode and the reference electrode are provided with a voltage amplitude V2 corresponding to the change of the liquid level H. The method has simple structure; particularly when the liquid container is a conductor, the liquid container can be directly used as the reference electrode in the instruction so that the method is simpler and more effective; simultaneously, when the depth of the container of the liquid to be measured is deep, the method of adding a signaling electrode above the signaling electrode directly can be used for extending the measurement range and improving the measurement precision.
Description
Technical field
The present invention relates to a kind of level measuring method and system of conductive liquid.
Background technology
The simplest direct method is to utilize electrode to measure the liquid level of liquid when liquid has electric conductivity.According to these characteristics, existing can have two classes substantially to the method that the liquid level of conductive liquid is carried out kinetic measurement: the one, and touching liquid with conductor electrode is sign, carry out the measurement of tracking mode with the electrode pair changes in liquid level of servo-actuated, as patent 200510019924.7 etc., characteristics are that the measurement of liquid level can be irrelevant with the conductivity value of liquid, but mechanism's more complicated of hunting gear; The 2nd, adopt the interelectrode resistance value that is inserted in the liquid to measure liquid level, as patent 01802236.7,00130050.4 and 01100074.0 etc., characteristics are that the mechanism of system is very simple, but the level gauging value of these class methods is to be based upon liquid to stop the fixing occasion of conductivity value.Patent 200710037413.7 adopts the level measuring method of two potential electrode and two sender electrodes, realized a kind of level measuring method that has nothing to do with the liquid electric conductivity value, the measuring method of four electrodes of this usefulness mainly is the level gauging that is applied in the non-full pipe electromagnetic flowmeter, because electrode number is more, more complicated will seem when directly being applied in level gauging such as open channel, water tank and hold-up vessel.
Summary of the invention
The level measuring method and the system that the purpose of this invention is to provide a kind of conductive liquid, realize a kind of maximum three electrodes with irrelevant method for measuring liquid level of liquid and the system of liquid electric conductivity value.Have simultaneously and have the ability of measuring the liquid electric conductivity value.
For achieving the above object, design of the present invention is: use a sender electrode, a potential electrode and the signal relation that reference electrode forms in liquid, between a sender electrode and reference electrode, apply electric signal X1, make the electric signal of corresponding liquid level change X2 is arranged between potential electrode and reference electrode, according to the ratio of electric signal X1 amplitude and potential electrode power on signal X2 amplitude, can draw and the irrelevant liquid level value of liquid electric conductivity value; Simultaneously, can estimate the conductivity value of liquid again by the current value between measurement sender electrode and reference electrode.When the container of liquid was conductor, the container of liquid can make the present invention more seem effectively simple directly as the reference electrode among the present invention.
According to the design of foregoing invention, the present invention by the following technical solutions:
A kind of level measuring method of conductive liquid, the conductive liquid and the container thereof that adopt tested liquid level H to change between the low paramount liquid level H2 of liquid level H1 contact or a potential electrode in liquid, a sender electrode and a reference electrode with liquid phase; It is characterized in that described potential electrode from horizontal direction between sender electrode and reference electrode, the level height of sender electrode is lower than liquid level H1, between sender electrode and reference electrode, apply the electric signal X1 of voltage magnitude V1, electric signal X1 is by the coupling of liquid, and the electric signal X2 at potential electrode and reference electrode two ends has with liquid level H and changes corresponding voltage magnitude V2.The ratio B of described voltage magnitude V1 and described voltage magnitude V2 and the conductivity of liquid are worth irrelevant and form one-to-one relationship with the level value H of liquid, thereby record liquid level H.When the distance of described potential electrode and sender electrode more less than potential electrode and reference electrode apart from the time, the variation of ratio B correspondence liquid level H has big more sensitivity.
In the level measuring method of above-mentioned conductive liquid, when described container is conductor, directly container as described reference electrode.
In the level measuring method of above-mentioned conductive liquid, described container depth chin-deep can directly increase the sender electrode and expand range and improve measuring accuracy above existing sender electrode.
In the level measuring method of above-mentioned conductive liquid, should not produce polarization phenomena in order to make described potential electrode, sender electrode and reference electrode, the electric signal X1 that is applied between sender electrode and the reference electrode is positive and negative alternation.
In the level measuring method of above-mentioned conductive liquid, make the corresponding current value I that produces between sender electrode and the reference electrode by described electric signal X1, can draw conductivity's value of liquid 1:
K1 is the constant that experiment is determined in the formula.
A kind of liquid level measuring system of conductive liquid is applied to the level measuring method of described conductive liquid, comprises the conductive liquid that tested liquid level H changes between the low paramount liquid level H2 of liquid level H1, the container of liquid; With the contacted potential electrode of liquid, a sender electrode and a reference electrode; Apply the electric signal X1 of voltage magnitude V1 between sender electrode and reference electrode, electric signal X1 is by the coupling of liquid, and the electric signal X2 of voltage magnitude V2 is arranged at potential electrode and reference electrode two ends; It is characterized in that:
(a). an end of a sender unit connects the sender electrode, the other end of sender unit connects an end of resistance R, the other end of resistance R connects reference electrode, the electric signal X0 of positive and negative alternation is exported in the sender unit, make the electric signal of voltage magnitude V1 X1 is arranged on sender electrode and the reference electrode, described electric signal X1 is by the coupling of liquid, make potential electrode and reference electrode two ends form the electric signal X2 of voltage magnitude V2, electric signal X1 makes between sender electrode and reference electrode and produces current value I, simultaneously current value I makes the resistance R two ends that the electric signal X3 of voltage magnitude V3, i.e. V3=I * R be arranged;
(b). described electric signal X1, electric signal X2 and electric signal X3 are connected to a signal processing unit, and signal processing unit calculates level value H and conductivity's value of liquid according to the voltage magnitude V3 of the voltage magnitude V2 of voltage magnitude V1, the electric signal X2 of electric signal X1 and electric signal X3.
The present invention compared with prior art has following conspicuous outstanding substantive distinguishing features and remarkable advantage: adopted the system architecture of maximum three electrodes, obtained and irrelevant level value dynamic measurement method and the system of liquid electric conductivity value.And also can measuring to liquid electric conductivity.Obviously, liquid level detection system of the present invention is electric signal transmission, measurement and a disposal system fully.Realizing and using to have simple and reliable characteristics.Directly conduct was with reference to electrode when container was conductor, and structure is simpler effectively, and the container chin-deep can come expanded range and raising measuring accuracy as long as increase a sender electrode.
Description of drawings
Fig. 1 is the system architecture synoptic diagram of one embodiment of the present of invention.
Fig. 2 is the system architecture synoptic diagram of Fig. 1 example when liquid container is conductor.
Fig. 3 is the system architecture synoptic diagram of Fig. 1 example at the container depth chin-deep.
Fig. 4 is that Fig. 1 example is the system architecture synoptic diagram of conductor and container depth chin-deep at liquid container.
Embodiment
Embodiment one:
The preferred embodiments of the present invention such as following:
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the level measuring method of this conductive liquid, the conductive liquid 1 that adopts tested liquid level H between the low paramount liquid level H2 of liquid level H1, to change, the container 2 of liquid 1, a potential electrode 3 in liquid 1, a sender electrode 4 and a reference electrode 5: it is characterized in that described potential electrode 3 upper end U are higher than liquid level H2, lower end D is lower than liquid level H1 and is A1 apart from container bottom, in the horizontal direction with container far-end wall at a distance of A5, with reference electrode 5 at a distance of A4, sender electrode 4 is lower than liquid level H1, with potential electrode 3 on same surface level with sender electrode 4 at a distance of A2, reference electrode 5 upper end U are higher than liquid level H2, lower end D and potential electrode 3 are on same surface level, in the horizontal direction with container near-end wall at a distance of A3, apply the electric signal X1 of voltage magnitude V1 at sender electrode 4 and 5 of reference electrodes, electric signal X1 is by the coupling of liquid 1, and the electric signal X2 at potential electrode 3 and reference electrode 5 two ends has with liquid 1 liquid level H and changes corresponding voltage magnitude V2.
In this method, come the level value H of corresponding liquid 1 with voltage magnitude V1 and the ratio B of the voltage magnitude V2 of described electric signal X2 of described electric signal X1.Because ratio B is worth irrelevant with the conductivity of liquid 1.Promptly have:
When the minimum distance that makes described potential electrode 3 and sender electrode 4 less than potential electrode 3 and reference electrode 5 apart from the time, the variation of the corresponding liquid level H of ratio B has bigger sensitivity.
In the method, when described container 2 is conductor, directly container 2 as described reference electrode 5.As shown in Figure 2.
In the method, described container 2 degree of depth chin-deeps, the sensitivity of the high more sensor of liquid level is low more, can be above existing sender electrode 4 the certain altitude place add sender electrode 4 again and come expanded range and improve sensitivity.As shown in Figure 3, Figure 4.
In the level measuring method of above-mentioned conductive liquid, do not produce polarization phenomena in order to make described potential electrode 3, sender electrode 4 and reference electrode 5, the electric signal X1 that is applied between sender electrode 4 and the reference electrode 5 is positive and negative alternation.The frequency of electric signal X1 can be between 50～2000Hz.Adopt bigger frequency when generally, the conductivity of liquid 1 is big.
In the method, make the corresponding current value I that produces between sender electrode 4 and the reference electrode 5, can draw conductivity's value of liquid 1 by described electric signal X1:
K1 is the constant that experiment is determined in the formula.
Embodiment two:
Referring to Fig. 1 and Fig. 3, the liquid level measuring system of this conductive liquid comprises the conductive liquid 1 that tested liquid level H changes, the container 2 of liquid 1 between the low paramount liquid level H2 of liquid level H1; A potential electrode 3, a sender electrode 4 and a reference electrode 5 are arranged in the liquid 1, apply the electric signal X1 of voltage magnitude V1 at sender electrode 4 and 5 of reference electrodes, the coupling of electric signal X1 by liquid 1 has the electric signal X2 of voltage magnitude V2 at potential electrode 3 and reference electrode 5 two ends; And have:
(a). an end of a sender unit 6 connects sender electrode 4, the other end of sender unit 6 connects an end of resistance R, the other end of resistance R connects reference electrode 5, the electric signal X0 of the positive and negative alternation of sender unit 6 outputs, make the electric signal X1 that voltage magnitude V1 is arranged on sender electrode 4 and the reference electrode 5, described electric signal X1 is by the coupling of liquid 1, make potential electrode 3 and reference electrode 5 two ends form the electric signal X2 of voltage magnitude V2, electric signal X1 makes sender electrode 4 and 5 of reference electrodes produce current value I, simultaneously current value I makes the resistance R two ends that the electric signal X3 of voltage magnitude V3, i.e. V3=I * R be arranged;
(b). described electric signal X1, electric signal X2 and electric signal X3 are connected to a signal processing unit 7, and signal processing unit 7 calculates level value H and conductivity's value of liquid 1 according to the voltage magnitude V3 of the voltage magnitude V2 of voltage magnitude V1, the electric signal X2 of electric signal X1 and electric signal X3.Referring to Fig. 2 and Fig. 4, when described container 2 is conductor, directly container 2 as described reference electrode 5.Referring to Fig. 3 and Fig. 4,, increase a sender electrode 4 at container 2 chin-deeps.
Claims (5)
1. the level measuring method of a conductive liquid, the conductive liquid (1) that adopts tested liquid level H between the low paramount liquid level H2 of liquid level H1, to change, the container (2) of liquid (1) is with the contacted potential electrode of liquid (1) (3), a sender electrode (4) and a reference electrode (5); It is characterized in that being positioned at from horizontal direction between sender electrode (4) and the reference electrode (5) in described potential electrode (3), the level height of sender electrode (4) is lower than liquid level H1, between sender electrode (4) and reference electrode (5), apply the electric signal X1 of voltage magnitude V1, electric signal X1 is by the coupling of liquid (1), and the electric signal X2 at potential electrode (3) and reference electrode (5) two ends has and liquid (1) liquid level H changes corresponding voltage magnitude V2; Described voltage magnitude V1 is worth irrelevant with the ratio B of described voltage magnitude V2 with the conductivity of liquid (1) and becomes one-to-one relationship with the level value H of liquid (1), thereby records liquid level H.
2. the level measuring method of conductive liquid according to claim 1 is characterized in that described container (2) when being conductor, directly container (2) as described reference electrode (5).
3. the level measuring method of conductive liquid according to claim 1, it is characterized in that the electric signal X1 that is applied between sender electrode (4) and the reference electrode (5) is positive and negative alternation in order to make described potential electrode (3), sender electrode (4) and reference electrode (5) not produce polarization phenomena.
4. the level measuring method of conductive liquid according to claim 1, it is characterized in that making the corresponding current value I that produces between sender electrode (4) and the reference electrode (5) by described electric signal X1, conductivity's value of the voltage magnitude V1 of described current value I, electric signal X1 and liquid (1) has following relation:
K1 is the constant that experiment is determined in the formula.
5. the liquid level measuring system of a conductive liquid, be applied to the level measuring method of the described conductive liquid of claim 1, comprise the conductive liquid (1) that tested liquid level H changes between the low paramount liquid level H2 of liquid level H1, the container (2) of liquid (1) is with the contacted potential electrode of liquid (1) (3), a sender electrode (4) and a reference electrode (5); It is characterized in that applying between described sender electrode (4) and reference electrode (5) the electric signal X1 of voltage magnitude V1, the coupling of electric signal X1 by liquid (1) has the electric signal X2 of voltage magnitude V2 at potential electrode (3) and reference electrode (5) two ends; It is characterized in that:
(a). an end of a sender unit (6) connects sender electrode (4), the other end of sender unit (6) connects an end of resistance R, the other end of resistance R connects reference electrode (5), the electric signal X0 of the positive and negative alternation of sender unit (6) output, make the electric signal X1 that voltage magnitude V1 is arranged on sender electrode (4) and the reference electrode (5), described electric signal X1 is by the coupling of liquid (1), make potential electrode (3) and reference electrode (5) two ends form the electric signal X2 of voltage magnitude V2, electric signal X1 makes between sender electrode (4) and reference electrode (5) and produces current value I, simultaneously current value I makes the resistance R two ends that the electric signal X3 of voltage magnitude V3, i.e. V3=I * R be arranged;
(b). described electric signal X1, electric signal X2 and electric signal X3 are connected to a signal processing unit (7), and signal processing unit (7) calculates level value H and conductivity's value of liquid (1) according to the voltage magnitude V3 of the voltage magnitude V2 of voltage magnitude V1, the electric signal X2 of electric signal X1 and electric signal X3.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102200463A (en) * | 2011-03-23 | 2011-09-28 | 泰州市瑞芝电子有限公司 | Liquid level linear measurement method based on impedance measurement |
| CN106500797A (en) * | 2016-12-09 | 2017-03-15 | 深圳市朗科智能电气股份有限公司 | Liquid level detection device and method |
| CN106768101A (en) * | 2016-12-09 | 2017-05-31 | 深圳市朗科智能电气股份有限公司 | Detecting device for liquid flow and method |
| WO2018103198A1 (en) * | 2016-12-09 | 2018-06-14 | 深圳市朗科智能电气股份有限公司 | Apparatus and method for liquid level detection |
| CN108309089A (en) * | 2017-01-17 | 2018-07-24 | 佛山市顺德区美的电热电器制造有限公司 | Food cooking machine and concentration detection method for food cooking machine |
| CN109632023A (en) * | 2019-01-25 | 2019-04-16 | 浙江大学 | A kind of flowmeter and its method based on electrical principles |
| CN110487353A (en) * | 2019-08-07 | 2019-11-22 | 青岛海信电子设备股份有限公司 | A kind of liquid level detection system |
| CN111380590A (en) * | 2018-12-27 | 2020-07-07 | 添可智能科技有限公司 | Cleaning equipment and detection circuit |
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| CN1362616A (en) * | 2001-01-08 | 2002-08-07 | 王晓峰 | Method of measuring level of conducting liquid |
| CN2650125Y (en) * | 2003-08-28 | 2004-10-20 | 叶大林 | Measuring electrode for liquid conductivity |
| CN100347526C (en) * | 2005-12-01 | 2007-11-07 | 武汉大学 | Conducting liquid level measuring device |
| CN100451572C (en) * | 2007-02-09 | 2009-01-14 | 李斌 | Liquid-level detecting method of conductive liquid and system |
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- 2009-04-30 CN CN2009100503438A patent/CN101566491B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102200463A (en) * | 2011-03-23 | 2011-09-28 | 泰州市瑞芝电子有限公司 | Liquid level linear measurement method based on impedance measurement |
| CN106500797A (en) * | 2016-12-09 | 2017-03-15 | 深圳市朗科智能电气股份有限公司 | Liquid level detection device and method |
| CN106768101A (en) * | 2016-12-09 | 2017-05-31 | 深圳市朗科智能电气股份有限公司 | Detecting device for liquid flow and method |
| WO2018103198A1 (en) * | 2016-12-09 | 2018-06-14 | 深圳市朗科智能电气股份有限公司 | Apparatus and method for liquid level detection |
| CN108309089A (en) * | 2017-01-17 | 2018-07-24 | 佛山市顺德区美的电热电器制造有限公司 | Food cooking machine and concentration detection method for food cooking machine |
| CN111380590A (en) * | 2018-12-27 | 2020-07-07 | 添可智能科技有限公司 | Cleaning equipment and detection circuit |
| CN111380590B (en) * | 2018-12-27 | 2022-04-05 | 添可智能科技有限公司 | Cleaning equipment and detection circuit |
| CN109632023A (en) * | 2019-01-25 | 2019-04-16 | 浙江大学 | A kind of flowmeter and its method based on electrical principles |
| CN110487353A (en) * | 2019-08-07 | 2019-11-22 | 青岛海信电子设备股份有限公司 | A kind of liquid level detection system |
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