Wednesday 18 March 2015

Hazardous area media converters for fibre optic Ethernet

R. Stahl’s 9721 series of media converters for optical cables enable hot plugging of Ethernet connections in zone 1 and 2 hazardous areas, i.e. the safe plugging and unplugging of communication links during operation.

The compact, cost-efficient converters connect Twisted Pair copper cables and fibre optic cables by means of standard plug connectors (RJ45 and SC types), creating a joint network. On the fibre optic side, the converters provide the ignition protection class “inherently safe optical radiation (op is)”, which allows for the use of conventional fibre optic cables in hazardous areas according to EN 60079-0:2013 and 60079-28. Just like intrinsically safe bus connections, these optical cables can be disconnected and reconnected as required during operation. Even in hazardous areas, fibre optic cables can thus be used for interference-free bridging of distances up to 5 km (multi-mode version) or up to 30 km (single-mode version).

Featuring an elegant, painted stainless steel design, the converters are delivered with mounting clips for space-saving horizontal or upright installation on C-profile DIN rails. This is the default method for zone 2. In zone 1, users can install units in compact flameproof enclosures. Two diagnostic LEDs signal various operating conditions. Measuring merely 80 x 63 x 25 mm and designed to tolerate a wide ambient temperature range of -30°C … +75°C, the media converters can be used in applications with limited installation space and rugged environmental conditions. Moreover, the 9721 series is optimised for use with R. Stahl’s explosion-protected IS1+ Remote I/O system as well as operating and monitoring systems from R. Stahl HMI Systems.

• Stahl products are marketed in Ireland by Douglas Controls & Automation

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