agency listings wfdexp explosion proof waterfow detector the system sensor wfdexp series is designed to handle extreme conditions. features new wfd30-2exp models install in 2? hole sizes ? designed and approved to operate in hazardous locations ? nema 4 enclosure rating ? sensitivity-setting spring mechanism located outside of explosion ? environment sealed retard mechanism ? visual switch activation ? synchronized activation circuit ? field-replaceable terminal block and retard mechanism ? only one conduit entrance required for hook-up ? these units are ideal for installation in hazardous locations classifed 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 32f to 160f. inside, two sets of spdt (form c) synchronized switches are enclosed in a rugged terminal block to assure reliable performance. reliable performance. the wfdexp series ofers 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 wfdexps reliability is its sealed retard mechanism, which prevents contamination by dust and dirt when the cover is removed. simplifed operation. like all system sensor waterfow detectors, the wfdexp series is designed for easy installation. with its visible switch activation, the wfdexps retard timing can be verifed, even during noisy conditions. e200116 c169 3006195 44-00-e 7770-1653:145
3825 ohio avenue ? st. charles, il 60174 phone: 800-sensor2 ? fax: 630-377-6495 ?2009 system sensor. product specifcations subject to change without notice. visit systemsensor.com for current product information, including the latest version of this data sheet. a05-1030-006 ? 2/09 ? #1925 ordering information model number pipe size hole size weight wfd20exp 2? 1?? 10.6 lbs. wfd25exp 2?? 1?? 10.7 lbs. wfd30-2exp 3? 2? 10.9 lbs. wfd35exp 3?? 1?? 11.2 lbs. wfd40exp 4? 2? 11.5 lbs. wfd50exp 5? 2? 12.1 lbs. wfd60exp 6? 2? 12.5 lbs. WFD80EXP 8? 2? 13.5 lbs. accessories a3008-0 replacement retard mechanism for all sizes 2?C8? a77-01-02 replacement terminal block wfdrk replacement hardware kit (contains tamper screws, wrench and conduit plug) wfdexp series specifications architectural/engineering specifcations vane-type, explosion-proof waterfow detectors shall be installed on system piping on the drawing and/or as specifed herein. detectors shall be mounted in hazardous locations classifed as: class i, div. 1 and 2, groups b, c, d; or class ii, div. 1 and 2, groups e, f, g; or class iii, div. 1 and 2. detectors shall mount on any clear pipe span of the appropriate nominal size, either a vertical upfow or horizontal run, at least 6? from any fttings which may change water direction, fow rate, or pipe diameter or no closer than 24? from a valve or drain. detectors shall have a sensitivity in the range of 4 to 10 gallons per minute and a static pressure rating of 450 psi for 2?C8? pipes. the detector shall respond to waterfow in the specifed direction after a preset time delay that is feld adjustable. the delay mechanism shall be a sealed mechanical pneumatic unit with visual indication of actuation. the actuation mechanism shall include a polyethylene vane inserted through a hole in the pipe and connected by a mechanical linkage to the delay mechanism. outputs shall consist of dual spdt switches (form c contacts). two conduit entrances (one of which is a knockout type) for standard fttings of commonly used electrical conduit shall be provided on the detectors. a grounding provision is provided. enclosures shall be nema 4 listed by underwriters laboratories inc. all detectors shall be listed by underwriters laboratories inc. for indoor or outdoor use. physical/operating specifcations hazardous locations classifcations class i, div 1 and 2, groups b, c, d class ii, div 1 and 2, groups e, f, g class iii, div 1 and 2 static pressure rating 450 psi (max.) triggered threshold bandwidth (flow rate) 4 to 10 gpm maximum surge 18 feet per second (fps) contact ratings two sets of spdt (form c) 10.0 a @ 125/250 vac 2.5 a @ 24 vdc compatible pipe steel water pipe, schedule 10 through 40 conduit entrances two openings for ?? conduit operating temperature range 32f to 120f (0c to 49c) enclosure rating nema 4 C suitable for indoor/outdoor use service use automatic sprinkler: nfpa-13 national fire alarm code: nfpa-72 overall dimensions 6?h 9?l 6.5?w weight (see ordering information) warranty 3 years u.s. patent numbers 5,213,205
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