08/27/2010 • Automation • Machine safety, industrial safety

Intrinsically safe electric circuits

With Dynamic Arc Recognition and Termination, Pepperl+Fuchs have presented a totally new concept for intrinsically safe electric circuits. It does not prevent the formation of a spark by drastically limiting the maximum effective power, but uses a dynamic electronic circuit, which automatically stops the flow of current, before a spark is able to ignite the atmosphere. Dynamic Arc Recognition and Terminations is based upon a totally new approach to guarantee the intrinsic safety (Ex i) demanded for explosion hazardous areas. With DART the formation of any potentially dangerous spark is turned off before it reaches ignition capability. Doing so DART uses the fact that any spark is accompanied by a sudden change of the flow of current within the electric circuit which is characterized by a typical pattern. DART detects this effect and reacts within only a few micro seconds by switching off the circuit. DARTS puts an end to the presently known power limitations and will allow the use of intrinsically safe field devices with a power rating of up to 50 watts within the explosion hazardous area.

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Pepperl+Fuchs SE

Lilienthalstraße 200
68307 Mannheim

Phone: +49 621 776-0
Fax: +49 621 776-1111