Temperature monitoring relays offer more functions in less space

22 June 2020

Siemens Smart Infrastructure has transformed the temperature monitoring relays from its Sirius portfolio. The new series 3RS2 devices are available in analogue and digital versions and they use sensors to measure the temperature – of engine, bearing, and transmission oils, or cooling liquids – in industrial control cabinets.

The relays are also able to monitor heating, air-conditioning, and ventilation systems, solar collectors, heat pumps, and hot water supply systems. The devices in the new Sirius 3RS2 series are approved for safety applications up to SIL 1/PL c, for use in industrial furnaces, as well as for monitoring burners and ATEX applications, among other things. 

With a width of 22.5mm, the Sirius 3RS26 digital devices are parameterised via an LCD display and can be connected to a sensor that evaluates whether the temperature is above or below a certain value or within a specific operating range (window function). A SIL1-certified infrared communications interface makes it possible to wirelessly add two resistance sensors and one analogue input. 


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