agency listings eps120-1 and eps120-2 supervisory pressure switches system sensor eps120 series switches are designed to supervise system air pressure in pipes or pressure tanks, as well as water or air pressure supplies of automatic water control valves. features pressure adjustment wheel, no special tools required field adjustable pressure sensitivity factory set for use in a nominal 115 psi system reinforced diaphragm resists pressure spikes two conduit entrances provided nema 4 rated ? ? ? ? ? ? the eps120-1 has a single spdt switch while the eps120-2 model contains two spdt switches. the eps120 series features fi eld adjustable pressure sensitivity to provide an alarm response between 10 and 200 psi. all models are factory set for use in a nominal 115 psi system. the eps120-1 is factory set to respond at 105 psi at decreasing pressure while the eps120-2 is factory set to respond at 125 psi on rising pressure and 105 psi on decreasing pressure. the pressure adjustment wheel requires no special tools and does not aff ect switch synchronization on the eps120-2. s739 cs169 7770-1209:147 3005863 167-93-e vds g4020027
3825 ohio avenue ? st. charles, il 60174 phone: 800-sensor2 ? fax: 630-377-6495 ?2007 system sensor. product specifi cations subject to change without notice. visit systemsensor.com for current product information, including the latest version of this data sheet. a05-0939-005 ? 4/07 ? #1676 ordering information ul model no. ulc/canadian model no. description eps120-1 EPSA120-1 low pressure supervisory switch, one spdt, 10C200 psi eps120-2 epsa120-2 high/low pressure supervisory switch, two spdt, 10C200 psi replacement parts s07-66-xx replacement tamper screws for cover of eps 546-8000 cover tamper switch for eps series wfdw replacement tamper proof wrench for cover of eps eps120 series specifications architectural/engineering specifi cations model shall be an eps120-1 or eps120-2 pressure type waterfl ow switch as manufactured by system sensor of st. charles, il. they shall be installed on the sprinkler system with connection as shown on the drawings and/or as specifi ed herein. pressure switches shall be of the bellows -activated type. switches shall have a maximum service pressure rating of 250 psi and shall be adjustable from 10C200 psi. there shall be one (1) or two (2) sp dt contacts rated at 10.0 amp @ 125/250 vac and 2.5 amp @ 6/12/24 vdc. the contractor shall furnish and install, where indicated on the plans, pressure switche s according to appropriate nfpa standards. switches shall be provided with a ?? npt male pressure connection to be connected into the air supply line on the sy stem side of any shut-off valve. switches shall provide 1 knockout type and 1 open hole for ?? conduit fi tting attachment and a ground screw provision for electrical grounding. the switch enclosure shall be weatherproof and carry a ul 4x/nema 4 rating when used with proper electrical fi ttings and conduit. the cove r shall incorporate tamper- resistant screws. the unit shall be listed by underwriters laboratories, inc. and underwriters laboratories of canada, inc. and approved by factory mutual. physical/operating specifi cations maximum operating pressure 250 psi diff erential approximately 3 psi @ 10 psi, 9 psi @ 200 psi pressure connection 1/2 npt male enclosure rated ul 4x, nema 4 for indoor or outdoor use maximum adjustment pressure range 100 to 200 psi dimensions 5.12? h 3.325? w 4.250? l (13.0 cm 8.4 cm 10.8 cm) operating temperature range indoor or outdoor use C40f to 160f (C40c to 71c) cover tamper switch ul models: optional p/n 546-8000 ulc models: factory installed factory setting eps120-1 operates at decreasing pressure at 105 psi eps120-2 operates at increasing pressure at 125 psi and decreasing pressure at 105 psi service use automatic sprinkler: nfpa 13 one or two family dwelling: nfpa 13d residential occupancies up to 4 stories: nfpa 13r national fire alarm code: nfpa 72 switch contact ratings eps120-1: one set spdt (form c) eps120-2: two sets spdt (form c) 10.0 a, 1/2 hp @ 125/250 vac 2.5 a @ 6/12/24 vdc shipping weight 1.2 lbs. (.54 kg) warranty 3 years pressure switch basic dimensions hex adjustment screw main adjustment wheel 4 1 / 4 5 1 / 8 locking screw 1 / 2 npt c o m ab ground screw (green) switch #2 electrical connections models eps120-1 switch at 115 p.s.i. (normal) switch at 105 p.s.i. (low trip pt.) b com a a com b switch 1 sw2 sw1 switches at 115 p.s.i. (normal) switches at 105 p.s.i. (low trip pt.) sw1 sw2 models eps120-2 switches at 125 p.s.i. (high trip pt.) sw1 sw2 b com a b com a b com a a com b a com b a com b typical sprinkler applications dry pipe valve os & y valve water by-pass test valve local alarm shut off valve water motor gong check valve eps120 check valve air line shut-off valve install bleeder valve for testing eps10 dry system wire to supervisory circuit of fire alarm control panel wire to alarm indicating circuit of fire alarm control panel to sprinkler system wet system alarm check valve os & y valve os & y valve water by-pass valve bleeder test valve local alarm shut off valve retard water motor gong wet system eps120
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