2872769 is suitable for Cummins excavator liquid level sensor

Sensor working mode

When choosing a pressure sensor, we need to pay attention to many problems, such as the range and accuracy of the pressure sensor, the temperature characteristics and chemical characteristics of the pressure sensor, and the working mode of the pressure sensor is also an important issue to be considered.

For example, the situation is different when sensors are used to measure gas pressure and liquid pressure. Gas is a compressible fluid. When it increases, it will store a certain amount of compressive energy, and when it is depressurized, it will be released as kinetic energy, which will exert a shock wave on the elastic membrane of the sensor. The pressure sensor is required to have a large overload capacity. Liquid is an incompressible fluid. When the pressure sensor is installed, the pressure of the liquid can be increased beyond the pressure limit of the elastic membrane by tightening the bolt and there is no room for compression, which leads to the rupture of the elastic membrane. Because this happens frequently, the pressure sensor is also required to have a large overpressure capacity. When the working environment of pressure sensor is harsh, such as large vibration, impact and electromagnetic interference, more stringent requirements are put forward for the sensor. It not only has strong overpressure ability, but also requires reliable mechanical seal, anti-loosening and correct sensor installation. The leads, pins and external wires of the sensor itself should be electromagnetically shielded, and the shielding should be well grounded. In addition, the compatibility of the pressure sensor with the measured fluid medium should be considered. For example, the elastic membrane structure of the sensor should be separated from the corrosive medium. At this time, a stainless steel corrugated sleeve sensor is adopted, and silicone oil is used as the pressure transmission medium in the sensor. When the sensor detects the pressure of flammable and explosive media, it uses a small excitation current to prevent sparks and sparks when the elastic membrane breaks, and to increase the pressure resistance of the pressure sensor jacket.

Only by knowing the working mode of pressure sensor can we choose the pressure sensor better, especially now that the pressure sensor is developing rapidly, so it is very necessary to know the working mode of pressure sensor.