Range range of pressure sensor

Pressure sensorThe pressure application range of is graded. This is because the elastic film of the pressure sensor has a limit to withstand fluid pressure. This is commonly known as the pressure limit, beyond which the elastic film ruptures. Generally speaking, each sensor has an overvoltage capacity of 20-300%. Therefore, the maximum pressure range stated in the product manual is 30-80% of the pressure limit Choosing an excessively high pressure range is unnecessary.

The selection of pressure range should mainly consider three factors:

The relationship between the maximum overpressure capacity, accuracy, and pressure range of the sensor, as well as the relationship between the price and pressure range of the sensor.

There is a significant difference in the maximum overpressure capacity of a sensor under static and dynamic pressure conditions. The latter often experiences shock pressure or even shock waves. The impact pressure is much higher than the static pressure. If the maximum working pressure range selected refers to static pressure, the sensor should choose a larger overpressure capacity when subjected to dynamic pressure. Otherwise, the impact pressure can easily reach the ultimate withstand voltage, causing damage to the pressure sensor. For the relationship between accuracy and pressure range. The thermal zero drift, thermal sensitivity drift coefficient, and nonlinear error of pressure sensors are important indicators that affect sensor accuracy. For the same pressure sensor, the thermal zero drift coefficient decreases with increasing working pressure, while the thermal sensitivity coefficient and nonlinear error increase with increasing working pressure. Therefore, increasing working pressure is beneficial for reducing thermal zero drift, but not for thermal sensitivity drift and nonlinear error. When the thermal zero drift is relatively large, increasing the working pressure range is beneficial for improving the accuracy of the pressure sensor. When the thermal zero drift is relatively small, reducing the working pressure range is beneficial for improving accuracy. For sensors with different pressure ranges, the sensitivity varies. The sensitivity and high resolution of low pressure range sensors are naturally high.

For the relationship between the price of sensors and the pressure range, generally speaking, pressure sensors with a pressure range of 013-1MPa are cheaper, while pressure sensors with a pressure range below 011MPa or above are more expensive. When measuring the pressure of 2-3kPa, a pressure sensor of 10-50kPa can be selected. Especially when users design and select compensation circuits themselves, the accuracy can be further improved. This can significantly reduce costs. Generally speaking, high-quality pressure sensors can achieve a full range output of 100mV/10V If only half of the pressure range is used, the corresponding output is only 50mV/10V Therefore, the maximum operating range should be as close as possible to the range level of the pressure sensor indicated in the product manual.