To select the right pressure sensor for a specific application besides the pressure range first of all the type of pressure measurement has to be considered. Pressure sensors measure a certain pressure in comparison to a reference pressure and can be divided into absolute, gage and differential devices. This report will explain these terms on the basis of First Sensor piezoresistive pressure sensors.
First Sensor LDE/LME/LMI differential pressure sensors measure ultra low air or gas pressures from 25 Pa (0.1 inH2O) full scale. The sensors are based on a new and innovative MEMS technology which integrates a micro flow channel within the silicon sensor chip.
First Sensor flow-based LDE/LME/LMI differential pressure sensors are experimentally compared in applications with dust-bearing air to other sensors which use the same sensing principle. Only the LDE/LME/LMI sensors kept their calibrated sensitivity over the entire duration of the tests.
First Sensor flow-based LDE/LME/LMI differential pressure sensors are experimentally compared in applications with high humidity to other sensors which use the same sensing principle. Only the LDE/LME/LMI sensors kept their calibrated sensitivity over the entire duration of the tests.
The digital HMI, HDI, HCLA, HCA and SSI pressure sensors are calibrated and temperature compensated with an on-board ASIC, which provides a corrected digital pressure value. For the HDI, HCLA, HCA and SSI series an additional analog voltage output is available at the same time.
The digital HME and HCE pressure sensors are calibrated and temperature compensated with an on-board ASIC, which provides a corrected digital pressure value. For the HCE series an additional analog voltage output is available at the same time.
First Sensor SSO series offers rugged OEM pressure sensors in a fully welded, media isolated stainless steel construction. These devices are temperature compensated from 0...50 °C when using constant current excitation. This application note describes the design of an appropriate constant current source.
The signal conditioning circuitry described below has been especially designed for First Sensor RCO series pressure sensors. However it can be applied to all sensors with a Common Mode voltage which is half of the supply voltage (VCM≈½ VS), e.g. First Sensor HDO series.
First Sensor oxygen sensors of the XYA series consist of two zirconium dioxide (ZrO2) discs coated with thin porous layers of platinum which serve as electrodes. The two discs are attached to a platinum ring, forming a hermetically sealed chamber.
If not using one of First Sensor ZBXYA interface boards for sensor control and conditioning of the XYA oxygen sensors, this appication note describes the basic building blocks required to create an interface circuit.
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