Analogue, Mixed Signal, LSI

Low-profile pressure transmitters

29 January 2020 Analogue, Mixed Signal, LSI

TDK has expanded its portfolio with new EPCOS pressure transmitters whose performance profiles are specially tailored to the requirements of Industry 4.0. These low-profile pressure sensors are characterised by their compact design, high accuracy and excellent long-term stability.

Big data is the prerequisite for Industry 4.0 solutions and processes. The basis for generating the required data in industrial processes and environments is the various types of sensors. The demand for pressure sensors and transmitters is increasing accordingly.

The leading basic pressure sensing technologies for MEMS are based on the piezoresistive and capacitive principles. While the latter is mainly suitable for consumer applications, the strengths of the piezoresistive principle are especially important for automotive and industrial applications.

Piezoresistive pressure sensors excel in terms of the following key performance parameters:

High absolute accuracy.

• Low temperature coefficient.

• Low temperature hysteresis.

• High robustness against different media.

• High long-term stability.

Absolute, gauge and differential measuring methods are used for a wide variety of tasks and requirements in industrial pressure measurement. These methods can be realised particularly well with piezoresistive MEMS technology.

Ultra-flat and networkable

Figure 1.

The new EPCOS series of low-profile pressure transmitters specially designed for Industry 4.0 applications features an extremely flat insertion height of only 6 mm and a footprint of 24 x 26 mm; with feedthroughs for simple, maintenance-friendly screw mounting (Figure 1).

This transmitter series is designed for a wide range of maximum rated pressures from 16 mbar to 7 bar FS (full scale). In the temperature range from -25°C to +85°C it achieves an accuracy of ±1% FS. The transmitters can be used for a wide range of applications, and installation is very simple as only two screws are required.

The integrated SPI interface with a resolution of 16 bits enables simple implementation in digital Industry 4.0 architectures. Thanks to the two connectors integrated in the transmitters, they can be easily networked in daisy chain topologies. These transmitters are optimised for differential pressure measurement that, for example, is used in the predictive maintenance of filter systems, pump control or gas flows.

MiniCell – robust, versatile and accurate

Figure 2.

The MiniCell family of miniaturised pressure transmitters is suitable for a wide range of industrial applications, especially in harsh environments (Figure 2). They cover a pressure range from 0,5 to 10  and can be operated at temperatures between -40°C and +140°C. They also achieve an accuracy of sub-1,5% FS over the entire temperature range and lifetime.

Particularly noteworthy is the high media resistance of these transmitters. It is made possible by a stainless steel diaphragm, which transmits the pressure to the sensor element via oil-filled and media-separated sensor cells. This enables the pressure measurement of aggressive liquids and gases. Despite their great robustness, these transmitters have miniaturised insertion height of just 11 mm and footprint of 16,2 x 19,6 mm.

Types available are for absolute, relative or differential measurement. The analog interface offers an output signal of 0,5 to 4,5 V. Together, these analog and digital solutions provide TDK with a platform of rugged and, above all, low-profile transmitters for a wide range of Industry 4.0 applications.


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