Liquid level transmitters are mainly used in industrial site level measurement, urban water supply and sewage treatment petroleum, chemical, power plant, hydrological monitoring, reservoir, dam, hydropower construction and other fields. Based on the principle that the hydrostatic pressure is proportional to the height of the liquid, the level transmitter uses the piezoresistive effect of diffused silicon elements to convert the static pressure into an electrical signal. Temperature-compensated and linear-corrected to convert standard signal outputs. In level transmitters, temperature drift is an important parameter. The temperature drift of the level transmitter can be divided into zero temperature drift and sensitivity temperature drift. Zero point temperature drift is the drift caused by temperature change in the output of the liquid level transmitter when it is not pressurized, in the application of liquid level transmitter, constant current power supply is often used, and the compensation method of zero point and its temperature drift can be used by the resistance series parallel method. The level transmitter of the constant current power supply bridge, the sensitivity temperature compensation usually uses the circuit shown in the figure. Among them, Rt in the R network is the thermistor with the temperature coefficient and sensitivity temperature drift in the same direction, and Rs, Rp, and Rz are the resistors with negligible temperature coefficient to adjust the temperature coefficient of Rt. The output signal of the level transmitter compensated by the above zero point and sensitivity can be considered to be independent of temperature changes within a certain temperature range.

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