These units are ideal for installation in hazardous locations classified as follows: Class I, Groups B, C, D, Division 1 & 2 Class II, Groups E, F, G, Division 1 & 2 Class III, Division 1 & 2 Robust Construction: The WFDEXP series consists of a rugged, NEMA 4-rated cast aluminum housing. Designed for both indoor and outdoor use, the WFDEXP series operates across a wide temperature range, from 32ºF to 160ºF. Inside, two sets of SPDT (Form C) synchronized switches are enclosed in a rugged terminal blo ck to assure reliable performance.
Reliable Performance: The WFDEXP series offers unique features that assure greater operational reliability. By housing the spring mechanism separately from the explosion environment, the sensitivity of the adjustment spring and the detector is protected at all times. Adding to WFDEXP's reliability is its sealed retard mechanism, which prevents contamination by dust and dirt when the cover is removed.
Simplified Operation: Like all System Sensor waterflow detector s, the WFDEXP series is designed for easy installation. With its visible switch activation, the WFDEXP's retard timing can be verified, even during noisy conditions.
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