Application
notes

Application notes

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 piezoresistive pressure sensors.

Selection of the Right Pressure Sensor
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Application advantages of LDE/LME differential pressure sensors due to their very high pneumatic impedance

First Sensor LDE/LME 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.

Download PDF-Application Note Application advantages of LDE/LME differential pressure sensors due to their very high pneumatic impedance
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LDE/LME differential pressure sensors - high immunity to dust contamination

First Sensor flow-based LDE/LME 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 sensors kept their calibrated sensitivity over the entire duration of the tests.

Download PDF-Application Note LBA Differential Pressure Sensors: High Immunity to Dust Contamination
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LDE/LME differential pressure sensors - high immunity to humidity

First Sensor flow-based LDE/LME differential pressure sensors are experimentally compared in applications with high humidity to other sensors which use the same sensing principle. Only the LDE/LME 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 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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Signal conditioning circuitry for the RCO and HDO series pressure sensors

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.

v Signal Conditioning Circuitry for the RCO and HDO Series Pressure Sensors
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Operation principle and construction of zirconium dioxide oxygen sensors of the XYA 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.


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

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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CLC liquid level sensor performance optimization

The performance and resolution of the CLC liquid level sensor basically depends on the application conditions such as the medium to be measured, vessel material and wall thickness, air gap between the sensor and the vessel and GND condition as well as changing electrical potentials in the vicinity of the sensor.

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Measuring transition points in liquids with different densities withcapacitive CLC and CLW level sensors

Due to their sensitivity and teaching possibilities First Sensor 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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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.

Download PDF-Anwendungshinweis: Vergleich von Massenstrom und Volumenstrom
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First Sensor AG is one of the world's leading suppliers in the field of sensor systems. In the growth market of sensor systems, First Sensor develops and produces customer-specific solutions for the ever-increasing number of applications in the industrial, medical, and mobility target markets. Our goal here is to identify, meet and solve the challenges of the future with our innovative sensor solutions early on.
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In many market-specific applications, sensors are components that are critical to your success. First Sensor is the partner you need on projects that call for careful selection, customized adaptation and the highest standards of excellence. Our Business Units Industrial, Medical and Mobility are clearly aligned to the core markets of industrial applications, medical technology as well as automotive and transport.
Tailored Solutions
In the growth market of sensor systems, First Sensor develops and produces customer-specific sensors, electronics, modules and complex systems for the ever-increasing number of applications in the industrial, medical, and mobility target markets. As a solution provider the company offers complete development services from a first draft and proof of concept up to the development of prototypes and finally serial production. First Sensor offers comprehensive development expertise, state-of-the-art packaging technologies and production capacities in clean rooms from ISO class 8 to 5.
Tailored Solutions
In the growth market of sensor systems, First Sensor develops and produces customer-specific sensors, electronics, modules and complex systems for the ever-increasing number of applications in the industrial, medical, and mobility target markets. As a solution provider the company offers complete development services from a first draft and proof of concept up to the development of prototypes and finally serial production. First Sensor offers comprehensive development expertise, state-of-the-art packaging technologies and production capacities in clean rooms from ISO class 8 to 5.

Tailored Solutions
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Innovation, excellence, proximity – these are our values, our ambition, our drive. Anything less is not an option. Our sensor solutions stand for technical innovation and economic growth. As such, they form the basis for the development and application of new technologies in almost all areas of life. We aim to shape this future together with you.