Leine & Linde's Model 841 ATEX-approved encoder for use in potentially explosive environments is now available from ATI Systems. The unit replaces Model 840 and has been redesigned to meet with all requirements in the new ATEX directive 94/9/EC. The directive stipulates among other things that all suppliers of components for explosion-proof products are required to CE-label and issue a declaration of manufacture for each product.
Leine & Linde's new explosion-proof model, as its predecessor, is meant primarily for motor speed feedback, positioning of heavy motor operations or generators.
The Model 841 incremental encoder, featuring hollow-shaft mounting, rides on the driving shaft and is available with either 12 or 16 mm hollow shafts. All electrical outputs are short-circuit protected against both 0 V as well as supply voltage, which is itself protected against polarity reversal. Another feature is that Model 841 can be delivered with the advanced diagnostic system ADS, making preventative maintenance possible.
Model 841 is certified by SP (Swedish National Testing and Research Institute) for use in Category II, Zone 1 and 2 (gas), and Zone 21 and 22 (dust). The encoder is certified according to Type Ex d, flameproof enclosure.
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