Thermistor type liquid level annunciator circuit with temperature compensation

• Main Authors: TANG WENLONG, QIAO TAO, QIU YAOYUAN, LI YONGJIE
• Format: Patent
• Language: Chinese; English
• Published: 11.11.2022
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

According to the thermistor type liquid level annunciator circuit with the temperature compensation function, the first temperature compensation circuit and the second temperature compensation circuit are arranged, when a liquid level annunciator is located in low-temperature air, a switch module input signal is compensated into a low-voltage signal, an alarm signal is triggered, and when the liquid level annunciator is located in high-temperature fuel oil, the switch module input signal is compensated into a low-voltage signal, and the alarm signal is triggered. An input signal of the switch module is compensated into a high-voltage signal, an alarm signal is not triggered, and an additional temperature compensation resistor is added, so that when the external environment temperature changes drastically, the voltage value of an acquisition point can be adjusted through the temperature compensation resistor, and the voltage of the acquisition point changes in the opposite direction; according to the temperatu