A dual-parameter liquid level discrimination method for a heated differential thermocouple liquid level sensor
A technology of liquid level sensor and thermocouple, which is applied in the direction of liquid level indicator for physical variable measurement, can solve the problem of slow signal change rate, achieve the effect of shortening time, improving accuracy and reliability, and improving response speed
Active Publication Date: 2021-03-09
NINGBO AUQI AUTO INSTR EQUIP
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[0003] When the heating power of the heating liquid level sensor is constant, due to the existence of thermal inertia, when the state of the liquid level changes, the rate of change of the signal is relatively slow, and the correct judgment of the state of the liquid level cannot be completed in a short time by using the threshold judgment method
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[0015] The present invention will be further described below in conjunction with accompanying drawings and embodiments.
[0016] like figure 1 As shown, when the heating differential thermocouple liquid level sensor measures, the liquid level change state is divided into two types, one is the liquid level rising state, and the digital signal curve of the heating differential thermocouple liquid level sensor in this state shows a rapid decline. ; The other is the liquid level drop state, in this state the digital signal curve of the heating differential thermocouple liquid level sensor shows a slow rise.
[0017] In the rising state of the liquid level, the liquid level discrimination is composed of two parameters, one of which is the cumulative value of the slope, that is, the slope
[0018] The cumulative value of △(△T) / △t (△T is the temperature difference, △t is the time difference), another parameter is the threshold value for judging the rise of the liquid level-the thres...
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A dual-parameter liquid level discrimination method for a heating differential thermocouple liquid level sensor, characterized in that the differential temperature signal of the sensor representing the state of the liquid level is converted into a digital signal, and the real-time slope △(△T) / △ t is calculated, and the slope is accumulated at the same time. If the accumulated slope value is positive, it is judged that the liquid level is in a declining state. Discriminant threshold when the level drops - - When the threshold is low, it is judged that the liquid level has left the liquid level measuring point; if the accumulated slope value is negative, it is judged that the liquid level is in a rising state; when the absolute value of the accumulated slope is greater than / equal to the liquid level rising When the absolute value of the accumulative value liquid at the time, and the digital signal △T value is less than / equal to the discrimination threshold when the liquid level rises--threshold liquid, it is determined that the liquid level has submerged the liquid level measuring point. The invention can improve the accuracy and reliability of liquid level discrimination and improve the response speed.
Description
technical field [0001] The invention relates to a method for processing liquid level signals of a heating type differential thermocouple liquid level sensor. Background technique [0002] The existing liquid level discrimination method of the heating liquid level sensor mainly adopts a single threshold judgment, that is, the converted digital signal is lower than the threshold, indicating that the liquid level has submerged the liquid level measuring point; when the converted digital signal is higher than the threshold, it indicates The liquid level has moved away from the liquid level measuring point. [0003] When the heating power of the heating liquid level sensor is constant, due to the existence of thermal inertia, when the liquid level state changes, the signal change rate is relatively slow, and the threshold judgment method cannot complete the correct judgment of the liquid level state in a short time. [0004] Therefore, how to shorten the response time of state d...
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IPC IPC(8): G01F23/22
CPCG01F23/22
Inventor 孙智超孙炯朱陈洛陈臻郑典俊查美生张宓黄炳臣黄伟杰李亮范瑾
Owner NINGBO AUQI AUTO INSTR EQUIP