Ex position switch for sub-zero applications

Written by: Tom Austin-Morgan | Published:

The light and robust Ex 97 switching devices with plastic housings from steute are tested and certified according to ATEX and IECEx for use in Gas Ex zones 1 and 2, as well as dust Ex zones 21 and 22. They can also be used in temperatures down to -60°C. The high protection class (IP 66) is said to remain guaranteed at such low temperatures, even during a 7-Joule impact test.

The robust housings are manufactured from high-quality plastic with a glass fibre reinforcement which is partly textile in structure. In addition, the housing covers are vulcanised, guaranteeing that they remain sealed even upon impact. To seal the plungers, steute has implemented a redundant sealing system comprising an external sealing cuff suitable for low temperatures and an internal Teflon sealing ring. The sealing materials used have been classified for temperatures down to -95°C, and the lubricants used for temperatures down to -75°C.

Due to their broad range of actuators and compact dimensions, the Ex norm switches are versatile and can be integrated in an existing construction. Their protectively insulated plastic design also makes earthing and potential equalisation unnecessary.

The switches are suited to the position monitoring of flaps, valves, covers and other moving components, for example in plants within the oil and gas industry or in shipbuilding and ports. Other application areas include handling systems on oil rigs, as well as position monitoring on crane booms.


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