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Method and system for measuring liquid level of conductive liquid

A liquid level measurement and conductivity technology, which is applied in the direction of fluid resistance measurement, liquid level indicator for physical variable measurement, etc. , the effect of extending the range

Inactive Publication Date: 2009-10-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this feature, there are basically two types of existing methods for dynamic measurement of the liquid level of conductive liquids: one is to mark the contact of the conductive electrode with the liquid, and use the moving electrode to track the change of the liquid level. Measurement, such as patent 200510019924.7, etc., is characterized in that the measurement of the liquid level can be independent of the conductivity value of the liquid, but the mechanism of the follower device is relatively complicated; the second is to use the resistance value between the electrodes inserted in the liquid to measure the liquid level, Such as patents 01802236.7, 00130050.4 and 01100074.0, etc., which are characterized by a very simple mechanism of the system, but the liquid level measurement value of this method is based on the occasion where the conductivity value of the liquid is fixed
Patent 200710037413.7 uses a liquid level measurement method with two measuring electrodes and two signaling electrodes to realize a liquid level measurement method independent of the liquid conductivity value. This measurement method with four electrodes is mainly used in non-full water The liquid level measurement of the tube electromagnetic flowmeter, due to the large number of electrodes, is more complicated when it is directly applied to the liquid level measurement of open channels, water tanks and storage tanks.

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  • Method and system for measuring liquid level of conductive liquid
  • Method and system for measuring liquid level of conductive liquid
  • Method and system for measuring liquid level of conductive liquid

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Experimental program
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Embodiment 1

[0022] Preferred embodiments of the present invention are as follows:

[0023] see figure 1 , figure 2 , image 3 and Figure 4 , the liquid level measuring method of the conductive liquid adopts the conductive liquid 1 whose liquid level H to be measured changes between the low liquid level H1 to the high liquid level H2, the container 2 of the liquid 1, and a measuring electrode 3 in the liquid 1, A sending electrode 4 and a reference electrode 5: It is characterized in that the upper end U of the measuring electrode 3 is higher than the liquid level H2, the lower end D is lower than the liquid level H1 and is A1 away from the bottom of the container, and is horizontally connected to the far end of the container The wall is A5 away from the reference electrode 5, A4 away from the reference electrode 5, the sending electrode 4 is lower than the liquid level H1, and the measuring electrode 3 is on the same horizontal plane as the sending electrode 4 A2 away, the upper end ...

Embodiment 2

[0034] see figure 1 and image 3 , the liquid level measurement system of the conductive liquid, including the conductive liquid 1 whose measured liquid level H changes between the low liquid level H1 and the high liquid level H2, a container 2 of the liquid 1; a measuring electrode 3, a The sending electrode 4 and a reference electrode 5 apply an electrical signal X1 with a voltage amplitude V1 between the sending electrode 4 and the reference electrode 5. The electrical signal X1 is coupled by the liquid 1, and there is a signal at both ends of the measuring electrode 3 and the reference electrode 5. Electrical signal X2 of voltage magnitude V2; and having:

[0035] (a). One end of a sending unit 6 is connected to the sending electrode 4, the other end of the sending unit 6 is connected to one end of the resistor R, the other end of the resistor R is connected to the reference electrode 5, and the sending unit 6 outputs positive and negative alternating The electrical sign...

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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 [0001] The invention relates to a method and system for measuring the liquid level of a conductive liquid. Background technique [0002] When the liquid is conductive, the most simple and direct method is to use electrodes to measure the liquid level of the liquid. According to this feature, there are basically two types of existing methods for dynamic measurement of the liquid level of conductive liquids: one is to mark the contact of the conductive electrode with the liquid, and use the moving electrode to track the change of the liquid level. Measurement, such as patent 200510019924.7, etc., is characterized in that the measurement of the liquid level can be independent of the conductivity value of the liquid, but the mechanism of the follower device is relatively complicated; the second is to use the resistance value between the electrodes inserted in the liquid to measure the liquid level, Such as patents 01802236.7, 00130050.4 and 01100074.0, etc., are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/22G01R27/22
Inventor 李斌臧楠沈天飞王逸俊李伟
Owner SHANGHAI UNIV