Integrated pressure/temperature sensors fill low-cost gap in harsh environs

October 13, 2017 ECD Staff

The latest addition to DunAn Sensing’s sensor product line, the TP Series of integrated pressure/temperature sensors, can survive the most rigorous harsh media environments. And it comes at a price point that suits it for both consumer and commercial HVAC systems. The TP series uses DunAn’s proprietary DURAsense packaging and microelectromechanical systems (MEMS) pressure sensor technology for high accuracy.

The core of the TP Series is a ceramic packaged module that comprises a ceramic substrate on which the MEMS piezo resistive pressure sensor and the thermistor are mounted. The button utilizes a media compatible rear-entry packaging strategy for media contact with the silicon sensor, thereby eliminating the contact of bond wires and electrical signals to the media. This also enhances reliability and the ability to operate in conductive media.

This packaging approach provides improved performance and lower price over those pressure sensors that use an oil-filled cavity and a metallic diaphragm. The pressure sensor and thermistor are eutectic bonded to the ceramic substrate which give the TP series enhanced ruggedness and reliability and avoids potential delamination. Signal conditioning for the pressure measurement and performance compensation is provided by an ASIC mounted on a PCB.

The DunAn TP Series is available in pressure ranges from 0-15 to 0-750 psi in both absolute and sealed gage. Device accuracy at 25°C (combined linearity, hysteresis and repeatability) is +/- 0.5% span. The guaranteed proof pressure of 3X rated pressure (maximum of 1500 psi) and burst pressure of 5X rated pressure (maximum of 2500 psi) insures trouble- free operation in demanding applications. All elements are enclosed in sealed cavity with a plastic lid.

The DunAn TP Series unit price is $74.00 in quantities up to 500. Evaluation units are available from stock.

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