The JCY8-82 pressure sensor is used for the air pillow pressure of the oxygen tank and the fuel tank, and the tank pressure sensor participates in the control. The digital output signal is the pressure value. The working principle of the JCY8-82 pressure sensor is shown in Figure 1. The pressure element is excited by the constant current source generated by the signal conditioning circuit. After feeling the pressure, it outputs an mV-level voltage signal. After processing and calibrating the voltage signal through the signal conditioning circuit, it is converted into a physical quantity. The signal sending circuit adopts a communication chip with its own power isolation to improve the anti-electromagnetic interference ability of the product and improve the reliability of the system.

Technical indicators (series of common parameters) Supply voltage: + 15V ± 1.5 VDC; Power consumption current: s80mA; Output (converted) pressure value at room temperature and atmospheric pressure (100kPa + 3kPa): 0.100 MPa ± 0.003 MPa; Accuracy at room temperature: ≤ 0, 2% F · S (including non-linearity, hysteresis, repeatability) The total accuracy of the whole temperature range: ≤ 1% F · S (-40 ℃ ~ + 60 ℃); Medium compatibility (design qualification test): The part of the sensor and medium needs to be adapted to methane and liquid oxygen; Leakage rate: ≤ 1.0 x10-7Pa-m3/s (mandatory checkpoint) Overload pressure: Under 1.5 times full range pressure, the product function will not be damaged, and it can be used normally after the overload pressure disappears; Safety pressure: Under the pressure of 2 times full range, the diaphragm of the product cannot leak; Digital output: RS-422 standard serial port off-output, differentially isolated from the internal circuit of the sensor, the interface circuit is shown in Figure 2, and the sending chip uses ADM2867ERNZ pressure data to send a frame every 20ms; Insulation resistance: 2100MQ (50V. DC) Product weight: ≤ 250g (cable length is 1m).