Nissan stainless steel excavator fittings hydraulic sensor

Product description

The hydraulic system of excavator generally uses silicon piezoresistive pressure sensor. The resistance strain gauge in the hydraulic high pressure sensor induces mechanical deformation after sensing the pressure of the main pump, resulting in the change of the resistance value of the sensor. The electronic circuit detects this change and converts and outputs a standard measurement electrical signal corresponding to this pressure to the controller. The controller converts the electric signal into pressure value and displays it on the display, and finally realizes the detection, transmission and display of the pressure signal of the main pump for real-time monitoring and fault diagnosis. In the process of no-load operation of the newly assembled excavator, the display shows that the pressure difference between the front and rear pumps is greater than 0.8MPa, which is a fault. This is because the main pump of the newly assembled excavator has been calibrated by the manufacturer. In the process of no-load operation, the actual pressure difference of the main pump itself is very small and can be ignored. Considering the influence of temperature and other comprehensive factors on the measurement of pressure sensor, the maximum allowable error range is ±1% of the full range, and the ultimate display pressure difference value of the pump before and after the calculation of error is 0.8MPa. If the pressure difference between the front and rear pumps is greater than 0.8MPa when the excavator is running without load, it exceeds the maximum error range. At this time, the hydraulic high pressure sensor can be judged to be damaged and should be replaced.