What issues need to be considered when choosing a pressure sensor? What kind of pressure is measured by the sensor, what kind of accuracy the sensor needs to achieve, how is the temperature resistance of the sensor, etc. The following is a detailed introduction.
- What pressure does the sensor measure?
The first thing to consider is the pressure limit of the system. Usually the required pressure sensor pressure range should reach 1.5 times the system equipped pressure value. The reason for this proposal is that these additional pressure ranges are due to the fact that many systems have pressure spikes or continuous pulses. These spikes can reach five to ten times the pressure and can cause damage to the sensor. Continuous high pressure pulses, approaching or exceeding the maximum pressure rating of the sensor, will shorten sensor life.
Simply increasing the sensor pressure rating when selecting a sensor is not a surefire way to sacrifice sensor resolution. The compromise is to opt to use a buffer to dampen the spikes, and even that will slow down the sensor’s response somewhat.
- What kind of accuracy does the sensor need to achieve?
Accuracy is often a term commonly used for sensor output error. These errors may originate from nonlinearity, hysteresis, non-repeatability, temperature, zero balance, calibration and humidity effects. For many sensors, the “accuracy” will be lower than nominal due to temperature, zero balance, etc.
- What is the temperature resistance of the sensor?
Pressure sensors, like all physical equipment systems, can fail or even fail in extreme temperature environments. Generally, each sensor will have two temperature ranges, namely the working range and the compensation range. The compensation range is included in the working range.
The operating range is the range within which the sensor can be exposed to the medium without damage after power-on. However, this does not mean that it will perform to the nominal specification (temperature coefficient) when outside the compensation range.