Temperature Measurement


Intrinsically safe temperature monitoring in Ex areas

May 2020 Temperature Measurement

All models of the versatile Raytek MI3 Compact series infrared transmitters are now also available as intrinsically safe versions for use in hazardous environments. Intrinsically safe devices prevent explosions in hazardous locations by limiting the energy and surface temperature of the device under normal operation, or when conditions arise that could become hazardous. Devices are approved as intrinsically safe only after passing the rigorous approval process required by a recognised entity.

The intelligent MI3 miniature sensors are now fully ATEX and IECEx certified for use in Zones 1 and 2 (gas) and Zones 21 and 22 (dust). The package includes the sensor, communication box and an Ex power supply. All three components are IP65 rated. One or two intrinsically safe MI3 sensing heads can be powered by one power supply. The sensor cables can be up to 30 m long in total, providing high flexibility for setting up safe monitoring scenarios. The communication box, power supply, and sensing heads can be easily exchanged in the field without re-calibration of the entire system.

With a separate IP65 housing for communications electronics, which can be mounted up to 15 m away, the Mi3 head sensor is possibly the smallest on the market and is easily installed in the tightest of locations.

The MI3 series comprises pyrometers for various spectral ranges and applications, including the 1M and 2M shortwave models with an excellent 100:1 resolution and 10 ms response time, which are suitable for monitoring temperatures up to 1800°C. Each intrinsically safe MI3 sensing head is labelled with the Ex certification. The MI3100 model’s Ex certification also covers the laser sighting function for easy positioning and aiming. MI3 sensors have excellent EMC characteristics and can be used in ambient temperatures up to 180°C. Communication boxes are available with RS-485, Modbus, Profibus, Ethernet TCP/IP and Profinet IO interfaces. Automatic head detection and digital communication between sensor and box enable plug-and-play setup.

With the addition of ATEX and ICEEx certification, the MI3 series can now be used in many additional areas – for example, in steel industry processes using hydrogen atmosphere, such as galvanising, annealing, plating and coating. Other application areas include hydrogen reduction in the solar industry, petrochemical (sulphur recovery, boilers, reactors, pipes, flare control) and chemical (fertiliser, starch, alcohols, flower, vinyl) processes, mining (monitoring) conveyors and equipment, fire detection and storage terminals (coal, wood pellets, sulphur, petroleum coke, starch), hazardous waste disposal and sewage, as well as ink, laminate and coating processes that emit volatile vapours, and more.

Thermalert TX

Although discontinued and replaced by Thermalert 4 for the standard version, the Ex certified TX is still available. Temperature ranges are up to 2000°C, and options include stainless steel or aluminium construction plus additional cooling for ambient temperatures of up to 175°C.

For more information contact R&C; Instrumentation, +27 11 608 1551, info@randci.co.za, www.randci.co.za


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