Self-heating differential thermoresistor liquid level sensor and liquid level measurement method thereof
A technology of liquid level sensor and thermal resistance, which is applied to the liquid level indicator of physical variable measurement, etc., can solve the problems of medium density fluctuation, short service life, low reliability, etc., and achieves simple structure, reliable performance, and anti-interference. powerful effect
Active Publication Date: 2015-04-29
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology
Some of these liquid level gauges need to open holes on the liquid storage tank / container or liquid storage pool, which brings a risk of leakage; some are affected by medium density fluctuations; some are not reliable; some have a short service life; some are not suitable for high temperature , high pressure, high radioactivity and other harsh environments
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[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0014] The liquid level sensor provided by the present invention adopts two armored thermal resistors of the same structure and equal quality as sensitive elements, and the thermal resistance wire in one of the sensitive elements is heated by itself with electricity to sense the liquid level, which is called a measuring element. The other one is not heated by electricity, and it is used to measure the ambient temperature and compensate for the influence of the ambient temperature, which is called a compensation element. The thermal resistances of the two sensitive elements are connected differentially or output independently, and the resistance values are subtracted to form a resistance difference. The specific resistance measurement method is a well-known technique in the art, and will not be repeated here. The liquid level sensor utilizes the obv...
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The invention belongs to the field of the sensor technology thermal parameter measurement, and particularly relates to a self-heating differential thermoresistor liquid level sensor and a liquid level measurement method thereof. According to the method, identical parts of two sheathed thermoresistors which are same in structure and equal in mass and serve as sensitive elements are put at the position of a measured liquid level; the thermal resistance wire of one of the sensitive elements is electrified to be heated and serves as a measurement element; the thermal resistance wire of the other sensitive elements is not electrified and serves as a compensating element; with the change of the liquid level, the resistance difference value of the thermal resistance wires of the two sensitive elements is measured through a resistance value measurement circuit, and liquid level height is worked out according to a relation between liquid level height obtained from experiments and the resistance difference value. The liquid level sensor provided by the invention is simple in structure, reliable in performance, high in sensitivity and high in anti-jamming capability.
Description
technical field [0001] The invention belongs to the field of sensor technology and thermal parameter measurement, in particular to a self-heating differential thermal resistance liquid level sensor and a method for measuring liquid level. Background technique [0002] At present, the liquid level measurement of many liquid storage tanks / containers or liquid storage tanks in the industry mostly uses differential pressure liquid level gauges, float level gauges, magnetic liquid level gauges, ultrasonic liquid level gauges, radar liquid level gauges, etc. Some of these liquid level gauges need to open holes on the liquid storage tank / container or liquid storage pool, which brings a risk of leakage; some are affected by medium density fluctuations; some are not reliable; some have a short service life; some are not suitable for high temperature , high pressure, high radioactivity and other harsh environments. Therefore, there is an urgent need for a liquid level measuring instr...
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IPC IPC(8): G01F23/22G01F23/24
Inventor 赵博査美生孙炯张瑞萍李昌磊李艳霞李珊珊闫桂银
Owner CHINA NUCLEAR POWER ENG CO LTD