Two-parameter liquid level judging method of heating type differential thermocouple liquid level sensor

• Main Authors: ZHU CHENLUO, ZHA MEISHENG, CHEN ZHEN, ZHENG DIANJUN, SUN JIONG, SUN ZHICHAO
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2019
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

The invention discloses a two-parameter liquid level judging method of a heating type differential thermocouple liquid level sensor. The method is characterized by converting a sensor differential temperature signal, used for representing a liquid surface state, into a digital signal, and performing real-time slope Delta (Delta T/Delta t) calculation for the digital signal, simultaneously, performing slope accumulation, if an accumulation slope value is positive, judging that the liquid level is in a dropping state, and when the accumulation slope value is greater than a judged value --accumulated value gas of a time when the liquid level drops, and the a Delta T value of the digital signal is greater than a judged threshold value --threshold value gas of a time when the liquid level drops, judging that the liquid surface is away from a liquid level measurement point; and if the accumulation slope value is negative, judging that the liquid level is in a rising state, and when an absolute value of the accumula