1089962512 atlas copco sensor press parts

I. Working Principle

The operation of the pressure sensor is based on the conversion of physical effects. There are three common types:

Piezoresistive effect: The resistance value of semiconductor materials (such as silicon) changes when subjected to pressure. The resistance change is converted into a voltage signal through a Wheatstone bridge.

Piezoelectric effect: Certain crystals (such as quartz) generate charges when subjected to force. The charge quantity is measured to indirectly obtain the pressure value.

Capacitive effect: Pressure changes cause the spacing between capacitor plates to change, thereby causing a change in capacitance value, which is then converted into an electrical signal.

III. Core Application Scenarios

Pressure Control: Maintain the pressure of the storage tank within the set range (such as 0.6 - 0.8 MPa), automatically unload when the pressure reaches the upper limit, and restart when it drops below the lower limit.

Safety Protection: Monitor the exhaust pressure. When the pressure exceeds the limit, trigger the safety valve or emergency shutdown to prevent explosion risks.

Energy Efficiency Optimization: By monitoring the pressure difference between the inlet and outlet, calculate the compression ratio, and adjust the motor power to achieve energy conservation.

Fault Diagnosis: Abnormal pressure fluctuations (such as sudden pressure drop) can indicate leakage or valve failure.

IV. Key Parameters for Selection

Measurement Range: Choose based on the working pressure of the air compressor. Generally, it is 1.5 - 2 times the working pressure (for example, if the working pressure is 0.8 MPa, select a range of 0 - 1.6 MPa).

Accuracy Grade: Industrial grade commonly uses ±0.5% FS, while laboratory or medical equipment requires ±0.1% FS or above.

Output Signal: Commonly 4 - 20mA (strong anti-interference, suitable for long-distance transmission), 0 - 10V (good compatibility).

Interface Material: For corrosive environments, choose stainless steel or ceramic interface materials.

Protection Grade: Select IP65 or higher protection grade for humid or dusty environments.

V. Installation and Maintenance Tips

Installation Location:

Avoid installing in areas with high vibration (such as near the motor), and add a shock-absorbing device.

Ensure the pressure interface is vertically downward to prevent condensate water from entering the sensor interior.

Calibration Period: It is recommended to calibrate once a year. For high-precision applications, calibrate every six months.

Troubleshooting:

No signal output: Check if the power supply and wiring are loose, and if the sensor is burned out.

Large output value fluctuation: It may be due to pipeline vibration, medium pulsation, or sensor aging.

Zero drift: Re-calibrate or replace the sensor.

VI. Typical Application Cases

Case 1: A factory's air compressor frequently starts and stops. By monitoring with a pressure sensor, it was found that the pressure of the storage tank fluctuated too much. After adjusting the sensor installation position and optimizing the PID parameters, the start-stop frequency decreased by 30%, extending the equipment lifespan.

Case 2: Medical air compressors use piezoresistive sensors (±0.05% FS) to ensure the output pressure is stable at 0.3 - 0.4 MPa, meeting the strict requirements of medical devices.

VII. Future Trends

Intelligentization: Integrate microprocessors, support digital communication (such as Modbus) and self-diagnosis functions.

Internet of Things (IoT): Connect with cloud platforms to achieve remote monitoring and predictive maintenance.

Low Power Consumption: Use MEMS technology to reduce power consumption, suitable for battery-powered portable devices.