The D / PS-C air pressure difference sensor is an invisible transmitter that can reassure customers. The CPU corrects the temperature drift point by point according to the temperature change. The pressure jitter during measurement can be filtered out through the damping function. It is not necessary to consider whether the output is stable at low ranges, and there is no need to worry about the influence of moisture and dust on the sensor. It can be installed in an open environment of -20 ～ 70 ℃ The third-generation CDM differential pressure measurement technology is used, which is insensitive to the medium and has no pressure drift.