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Temperature Measurement Built for Challenging Environments

| Editor: Dr. Jörg Kempf

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Jumo has extended its Wtrans wireless temperature measuring system, adding transmitters with Atex approval and for environmental temperatures up to 125 °C. The body of the Atex transmitter can be mounted in a Zone 1 hazardous area, with the probe itself in either Zone 0 or Zone 1. A wireless link to a receiver located in a safe area eliminates the need for cables and protective barriers. The high-temperature transmitters are for applications such as furnaces where the entire transmitter needs to be located within the process equipment. Versions are available with a fixed protection tube to measure temperatures of –30 to +260 °C, while a range of –200 to +600 °C is possible with transmitter versions using a remote temperature sensor. Jumo’s rail-mounted receivers provide either four analog outputs or two analog outputs and two floating relays, plus an RS-485 interface with Modbus. Up to 16 Wtrans transmitters can connect to each receiver. Wireless transmitters are especially useful in challenging environments such as potentially explosive atmospheres and high air temperatures, the firm points out.

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