Application notes

Download PDF-Anwendungshinweis: Auswahl des passenden Drucksensors 
Selection of the right pressure sensor

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's piezoresistive pressure sensors.

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Application advantages of LBA differential pressure sensors due to their
very high pneumatic impedance

First Sensor's LBA 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.

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Download PDF-Application Note LBA Differential Pressure Sensors: High Immunity to Dust Contamination
LBA differential pressure sensors - high immunity to dust contamination

First Sensor's flow-based LBA differential pressure sensors are experimentally compared in applications with dust-bearing air to other sensors which use the same sensing principle. Only the LBA sensors kept their calibrated sensitivity over the entire duration of the tests.

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Download PDF-Application Note LBA Differential Pressure Sensors: High Immunity to Humidity
LBA differential pressure sensors - high immunity to humidity

First Sensor's flow-based LBA differential pressure sensors are experimentally compared in applications with high humidity to other sensors which use the same sensing principle. Only the LBA sensors kept their calibrated sensitivity over the entire duration of the tests.

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I²C bus communication with digital HMI, HDI, HCLA, HCA and SSI
pressure sensors

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.

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SPI bus communication with digital HME and HCE pressure sensors

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.

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Constant current excitation for SSO stainless steel pressure sensors

First Sensor's 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.

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Download PDF-Anwendungshinweis: Signal Conditioning Circuitry for the RCO and HDO Series Pressure Sensors
Signal conditioning circuitry for the RCO and HDO series pressure sensors

The signal conditioning circuitry described below has been especially designed for First Sensor's 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's HDO series.

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Download PDF-Anwendungshinweis: Signal Conditioning Circuitry for the RXU and XSU Series Sensors
Signal conditioning circuitry for the RXU and XSU series sensors

This application note describes a low cost approach for temperature compensating First Sensor's RXU series sensors which is easy to implement in production. The discussed solution can also be used for other uncompensated pressure sensors such as First Sensor's XSU series.

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Operation principle and construction of zirconium dioxide oxygen sensors
of the XYA series

First Sensor's 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.

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Designing interface electronics for zirconium dioxide oxygen sensors
of the XYA series

If not using one of First Sensor's 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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Download PDF-Application Note: Measuring Transition Points in Liquids
Measuring transition points in liquids with different densities with
capacitive CLC and CLW level sensors


Due to their sensitivity and teaching possibilities First Sensor's capacitive  CLC and CLW sensors can be used to determine transition points between any two liquids with different densities and a sufficient difference in relative permittivity. A typical application is the detection of water accumulating at the bottom of an oil tank.

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Download PDF-Anwendungshinweis: Vergleich von Massenstrom und Volumenstrom
Mass flow versus volumetric flow

Mass flow is a dynamic mass per time unit measured in grams per minute (g/min). By referencing a volumetric flow (cm3/min) to its known temperature and pressure, an exact mass flow can be calculated. It is common in the industry to specify mass flow in terms of volumetric flow at standard (reference) conditions.

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Product note list