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Incremental encoder for explosive atmospheres

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Johannes Hübner Giessen is introducing an incremental encoder for explosive atmospheres in the heavy-duty sector.

Explosive atmospheres are a special field in heavy industry subject to stringent safety requirements. With this in mind Johannes Hübner Giessen developed the incremental encoder Ex FG 40 for applications in extremely harsh environments and stringent explosion protection requirements.

These include explosive gas environments such as in the production of oil and gas on platforms and offshore drilling rigs, petrochemical plants, oil and gas processing, paint shops in the steel sector as well as application fields with explosive dust atmospheres such as in mining and bulk materials handling terminals.

The Ex FG 40 is certified according to both the latest Directive ATEX 2014/34/EU across the European countries as well as the international IECEx concept for Zones 1 and 2 (gas) and Zones 21 and 22 (dust); the precise marking is: II 2G Ex db IIC T6-T5 Gb (gas) and II 2D Ex tb IIIC T85°C Db IP6x (dust). Dual certification means it is possible to deploy the Ex FG 40 in a very large number of countries without the need for additional national certificates of conformity.

The Ex FG 40 is a further development of the standard Hübner encoder FG 40, from which the electronics are derived. In contrast, the mechanical components are completely new.

Distinguishing features of the device are its extremely rugged construction thanks to the thick-walled enclosure, a long service life due to the large ball bearings and robust stainless steel shaft with feather key, its resistance to shock and vibration as well as the high-level of corrosion protection thanks to the high-quality anodic coating.

Despite the high protection class IP66 the Ex FG 40 offers a wide speed range up to 6000 rpm as well as suitability for an ambient temperature range of -40 °C to +60 °C. It is possible to deploy the device up to 4000 m AMSL.

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