The normal output value is 10Mpa and the voltage is 1.13v. Pressure difference sensor through a certain design structure or according to the requirements of the installation, the change of the pressure difference before and after the change of the sensor built-in pressure sensor, and then the output of the weak signal generated by the deformation of the pressure sensor for processing modulation or through the analog-to-digital conversion and chip operation processing, the output analog signal or digital signal.