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All in one pressure & temperature sensor for aqueous corrosive liquids
19th May 2007
 Measuring aggressive media directly can lead to a short life for sensors if they have not been designed and tested for use with a corrosive fluid. The Grundfos direct sensors range of pressure sensors have been developed for long lasting service on boilers, heating and other water management systems.
The Grundfos range includes a RPS gauge reference pressure sensor for 0.6, 1, 1.6, 2.5, 4, 6 & 10 bar system pressures.
The sensor technology is based around an exposed silicon chip diaphragm with a diffused piezo-resistive strain gauge bridge which is coated via a thin film diffusion process with a metal glass alloy. This corrosion resistant coating is one of the key components in producing a low cost pressure sensor that can tolerate aqueous liquids with a pH ranging from 2 to 11 over a temperature from 0 to 100 degrees Celsius. The RPS pressure transducer includes a temperature sensor which is located on the silicon chip in direct contact with the media for optimum thermal contact and response. The uncompensated signals from the pressure & temperature sensors are fed into a microprocessor where algorithms compensate using coefficients obtained from calibration data the incoming signal and convert it to a 0.5 to 3.5 volt analogue output.
The accuracy achieved after compensation is 2% for the pressure signal over +20 to +80 degrees Celsius and 1 degree Celsius for the temperature sensor.
The RPS water pressure sensor is packaged in an IP44 composite housing and can be either integrated into an OEM design or incorporated by a system integrator when supplied with the installation kit.
The Grundfos RPS liquid pressure sensor combines corrosion resistance, accuracy and affordability with an innovative and patented sensing technology to reduce costs on industrial water systems and introduce more control in domestic heating installations.
Related Products RPS product page for further details and requesting a quotation Sensors and instruments for measuring both temperature and pressure
Associated Topics Submersible data logger for corrosive liquids Hydrostatic level transmitter for aggressive chemicals IP68 plastic liquid level sensor for caustic media
Resources Technical terms related to pressure sensors Converting pressure units Temperature unit conversion
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