Self-sufficient control devices for explosion protection

24 October 2011

The control devices in the Steute Ex RF BF 80 series, designed for use in explosive zones, are now also wireless and self-sufficient.

In order to assemble the control and command devices, the enclosure has to be simply affixed to the wall or machine. No power or signal cables are required, because signals are transmitted by radio. A miniaturised electrodynamic energy transformer mounted on the switch plunger transforms kinetic energy to electrical energy and a signal is sent to the receiver unit by radio, producing power.

This wireless technology has long been tried and tested in both industrial applications and building automation, and has now begun to assert itself in the field of explosion protection. The steute ‘Energy Harvesting’ technology has been approved by the appropriate authorities – with the result that the command devices in its Ex RF BF 80 series are certified for use in gas-Ex zones 1 and 2, as well as dust-Ex zones 21 and 22, in accordance with the ATEX guidelines.

The plastic enclosure of our new command devices is robust and the range offers variants for one, two and three control elements available, with users being able to choose from a range of pushbuttons, mushroom pushbuttons, selector and key switches. The wireless protocol guarantees a high degree of transmission safety over distances of up to 30m indoors or 200m outdoors.

The switching insert with its electrodynamic energy generator has been developed for operation in rough industrial applications, achieving a mechanical lifetime of over one million switching cycles.

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