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Safe switching under extreme conditions

Switchgear with Atex approval
Safe switching under extreme conditions

Switching devices need to be protected from damp and extreme temperatures. Depending on the type of switch, vibration, dirt and corrosive media or gases can also affect their performance and lifespan. Steute has developed electromechanical and non-contact switching devices especially for use in extreme environments.

Switchgear with Atex approval

Safe switching under extreme conditions
Switching devices need to be protected from damp and extreme temperatures. Depending on the type of switch, vibration, dirt and corrosive media or gases can also affect their performance and lifespan. Steute has developed electromechanical and non-contact switching devices especially for use in extreme environments.
Steute’s Extreme range includes a position switch which does not work according to conventional on-off technology. Instead, it sends an analogue signal corresponding to the position of the actuator or plunger. This position is registered by an integral Hall sensor, which processes the outgoing signal as a standard signal depending on the version (0…20 mA, 4…20 mA, 0…10 V).
This functionality is available in the Extreme 98 position switch series, characterised amongst other things by robust metal housings, high protection classes and standardised dimensions in accordance with DIN EN 50041. The different actuators can be mounted in positions offset by 4 x 90°, meaning that the analogue position switch can be integrated flexibly in the surrounding structure. Particular flexibility is also ensured by the fact that this switch can be individually programmed in the factory and thus ideally adapted to suit the application in question.
Position monitoring of valve actuators
The explosion-proof HS 98 version has Atex/IEC Ex approval for use in gas Ex zones 1 and 2 as well as dust Ex zones 21 and 22. The features of this robust analogue position switch also make it suitable for precise position monitoring of flaps, valves and other control elements installed in explosive environments.
One of the first applications for this position switch involved monitoring the position of valve actuators in the shipping industry. It is integrated in Pleiger valve controls, which are used there for filling and emptying ballast, service water and fuel tanks in freight and cruise ships. These valves typically have a nominal diameter of 300 to 400 mm. The position switch is installed in the operating head of the valve and sends an analogue signal to the control showing the valve position.
Wireless technology for Ex zones
One current trend is the increasing use of wireless switching devices – especially in extreme and explosive environments. Steute offers a variety of sWave wireless technologies employing different frequencies (868/915 kHz/2.4 GHz) and providing different features and functions (uni- or bidirectional, with or without confirmation of receipt, self-sufficient or battery-powered). The sWave wireless technology has now also been adapted and certified for use in hazardous areas. Amongst other modifications, the signal output power was reduced without limiting its range or transmission reliability.
Current additions to the Steute wireless Ex range include the Ex RF 96 wireless position switch in a rectangular design as well as the Ex RF 96 ST wireless universal transmitter with an M12 slot for connecting Ex RF IS M 12, M 18 and M 30 wireless inductive sensors. All of these devices are Atex and IEC Ex approved for use in Ex zones 1 and 21. The RF 96 series comes with a battery which can be replaced directly in the hazardous area. Since the sWave technology is very energy efficient, this is often only necessary after several years, depending on the application.
www.cpp-net.com search: cpp0315steute

Rainer Lumme
Rainer Lumme
Product Manager Extreme,Steute Schaltgeräte
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