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How to choose a piezoresistive pressure sensor(accuracy and temperature compensation)
2015-01-26

3, What kind of accuracy sensors need. Accuracy is a term used to describe the sensors' output error, these errors may be derived from non-linearity, hysteresis and non-repeatability, temperature, zero balance, calibration and humidity effects. Typically, the accuracy is specified as non-linearity, hysteresis and repeatability combined effects.

For examples, sendo ss2xx series pressure sensor is a kind of low cost pressure sensor, offer 1.0% to 2.0% accuracy. (see pic1). Another application is for industrial, sendo ss3xx series industrial pressure sensor with a better accuracy with 0.5% or even 0.25%, these sensors are suitable for almost all kind of environment,for example, high temperature, moist, for ocean depth measurements, groundwater monitoring ect. (see pic2).
electric fuel pressure sensoranalog hydraulic pressure sensor
pic1: ss2xx series pressure sensor                                  pic2 : industrial pressure sensor


4, Temperature resistance performance of the sensor. Pressure sensors, like all physical devices systems, will get an error in extreme temperature conditions or even not working. Generally speaking, each sensor will have two temperature ranges, working temperature and compensation temprature. Compensation range is included in the scope of work.

The operating temperature is within this range, the sensor can be exposed to the medium without damage.However, this does not mean that the performance can reach the nominal specifications when the temperature is out of compensation (temperature coefficient).

Temperature compensation range is generally a period within the working range, more narrow. Within this range, the sensor can be ensure the nominal specifications. Changes in temperature affect the sensor in two ways: One is zero drift, the second is the impact of the output of the entire range. Usually the temperature range is room temp to 70°C, and also may require further compensation from -30 to 120degC.

Sendo sensor offer typical wider temperature compensated range from 0 to 80 deg C or -10 to 70 degC, and the working temperature can be -20 to 100 degC, some types of our sensor can work from -40 degC to 300 degC(SS303 series miniature high temperature pressure sensor)(see pic 3), and sensors desgined with all stainless steel structure without o-ring can work under -40degC(oem pressure sensors for industrial application )(see pic 4)

High temperature air pressure sensor oem pressure sensors for industrial application

pic 3: high temperature pressure sensor                                         pic4: oem pressure sensors for industrial application