To choose the right piezoresistive pressure sensors, actually we must know the technical specifications of the pressure sensor, such as pressure range, accuracy, output signal, pressure connection, cable length, temperature compensation, impedance. In the following, we would like to describe the 2 main elements that affect the pressure sensors selection.
- How to choose the pressure range of the sensor. The first thing need to consider is the maximum pressure in your system, generally, the require pressure sensors should reach the 1.5 times the maximum pressure value on your system. We recommend these extra pressure range because many systems, particularly water treatment and process control, have pressure spikes, or successive pulses. These spikes may reach "maximum" pressure five times or even ten times, and can cause damage to the sensor. Continuous high-pressure pulse, close to or more than the maximum rated pressure sensor will shorten the life of the sensor. But just improve the rated pressure sensor is not a surefire plan, because it would sacrifice sensor resolution. You can use the bumper to weaken the spike, but this is only a compromise, because it will reduce the response time of the sensor.So you need to find a compromise solution between system performance and sensor life time.
- 2.Pay attention to the tested medium. Is there will be a viscous liquid or slurry material on the pressure connectioin or in the pressure hole ? the media in contact with the sensor whether it is solubility or corrosive or clean dry air, these are also important factors affecting the choice of materials and structures.