Potter PS25 Low High Supervisory Pressure Switch for Low Differential Dry and Preaction Valves - Nominal System Pressure 25 psi

Features Two switch model Independent switch adjustment no tools needed Two 1 2 conduit cable entrances Separate isolated wiring chambers Non corrosive pressure connection Non Conductive Enclosure VdS version available document contains important information on the installation operation of PS25 pressure switches Please read all instructions before beginning installation A copy of this document is by NFPA 72 to be maintained on site Potter PS25 Series Supervisory Pressure Actuated Switches are primarily to detect an increase and or decrease from normal pressure in automatic fire sprinkler systems Typical applications air nitrogen supervision in dry pipe and pre action systems pressure air supplies and water supplies The PS25 2 has two switches Low switch is factory set to activate at approximately 18 psi bar on a decrease in pressure The High switch is factory set to at approximately 28 psi 1,9 bar on an increase in pressure 72 requires a supervisory signal for both high and low pressure The PS25 is factory set for a normal air pressure of 23 psi section heading Adjustments and Testing if other than factory set is required Connect the PS25 to the system side of any shutoff or check valve Apply Teflon tape to the threaded male connection on the device Device should be mounted in the upright position Threaded not use pipe dope down Tighten the device using a wrench on the flats on the device Specifications Entrances Ratings Tamper Adjustment knockouts for 1 2 conduit provided Individual switch and ground screw suitable for dissimilar voltages SPDT Form C Switches Amps at 125 250 VAC 2.0 Amps at 30 VDC incorporates tamper resistant fastener that requires a special for removal One key is supplied with each device 1 lb at 10 psi 07 at 7 bar lbs at 60 psi 28 at 4,1 bar Weather UV Flame Resistant High Impact Composite Die Cast parts have corrosion resistant finishes F to 140 40 to 60 4 IP66 Rated Enclosure indoor or outdoor when used with 4 conduit fittings operates on increase at 28 psi 1,9 bar and on decrease at psi 1,2 bar psi 20,68 bar System Connection Nylon 1 2 NPT male psi 7 4,1 bar Range Use 13 13D 13R 72 subject to change without notice PAGE 1 OF 4 Pressure Switch5401564 REV B 2 20Potter Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal comfirealarmresources com Clamping Terminal Plate 2 uninsulated section of a single conductor should not be looped the terminal and serve as two separate connections The must be severed thereby providing supervision of the in the event that the wire becomes dislodged from the terminal Sprinkler Applications 3 SUPERVISORY PRESSURE SWITCH LINE PIPE Y 924 1A of any shutoff valves between the alarm check valve the PS10 will render the PS10 inoperative To comply with IFC and NFPA 13 any such valve shall be electrically with a supervisory switch such as Potter Model Instructions Remove the tamper resistant screw with the special key provided it is necessary to remove the sealed knockouts carefully place a on the edge of the knockout and sharply apply a force to dislodge the knockout plug See Fig 9 Run wires through an approved conduit connector and affix connector to the device A NEMA 4 rated conduit fitting is for outdoor use Connect the wires to the appropriate terminal connections for the intended See Figures 2,4,5 and 6 NEMA 4 rated conduit is required for outdoor use and Testing Testing the PS25 may activate other system connected devices operation of the pressure supervisory switch should be tested upon of installation and periodically thereafter in accordance with applicable local national and NFPA codes and standards and or the having jurisdiction manufacturer recommends quarterly or frequently use of a Potter BVL see product bulletin 5400799 for details recommended to facilitate setting and testing of the PS25 pressure When a BVL bleeder valve is used the pressure to the switch be isolated and bled from the exhaust port on the BVL without the supervisory pressure of the entire system See Fig 3 operation point of the PS25 Pressure Switch can be adjusted to any between 10 and 60 psi 0,7 4,1 bar by turning the adjustment clockwise to raise the actuation point and counter clockwise lower the actuation point In the case of the PS25 2 both switches independent of each other Each switch may be independently to actuate at any point across the switch adjustment range If the needs to be adjusted from the factory settings adjust the system to the desired trip point Use an ohmmeter on the appropriate COM and 2 for pressure decrease and COM and 1 for pressure Adjust the knurled knob until the meter changes state At that the switch is set for that particular pressure Final adjustments be verified with a pressure gauge position of the top of the adjustment knob across to the printed on the switch bracket can be used to provide an approximate visual of the pressure switch setting 1 NPT To prevent leakage apply Teflon tape sealant to male threads only 930 1 PAGE 2 OF 4 REV B 2 20Potter Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal comPS25Supervisory Pressure Switchfirealarmresources com Electrical Connections 4 Conduit Wiring 7 FIRE NORMAL SYSTEM PRESSURE APPLIED HIGH TERMINAL 1 WILL CLOSE PRESSURE INCREASE NORMAL SYSTEM PRESSURE APPLIED LOW TERMINAL 2 CLOSES ON DROP Pressure Signal Connection 5 FIRE ALARM PANEL PRESSURE SWITCH 928 4 Pressure 8 Pressure Switch PRESSURE SWITCH Pressure Switch PRESSURE SWITCH 928 1 Pressure Signal Connection 6 FIRE ALARM PANEL Common PRESSURE SWITCH 930 3 Open when installed normal system Closes on in pressure Use high air signal Closed under normal pressure Closed when installed normal system 930 3 Open when installed normal system Closes on drop Use for air signal Knockouts 9 928 2 PAGE 3 OF 4 REV B 2 20Potter Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal comPS25Supervisory Pressure Switchfirealarmresources com Specifications Type Waterflow Switch type supervisory switches shall be a Model PS25 as by Potter Electric Signal Company St Louis MO and be installed on the fire sprinkler system as shown and or specified shall be provided with a 1 2 NPT male pressure connection be connected into the air supply line on the system side of any shut valve A Model BVL bleeder valve as supplied by Potter Electric Company of St Louis MO or equivalent shall be connected line with the PS25 to provide a means of testing the operation of the switch See Fig 3 switch unit shall contain SPDT Form C switch es One switch be set to operate at 18 psi 1,2 bar on a pressure decrease The switch shall be set to operate at a 28 psi 1,9 bar on a pressure contacts shall be rated at 10.1 Amps at 125 250VAC and 2.0 at 30VDC The units shall have a maximum pressure rating of psi 20,68 bar and shall be adjustable from 10 to 60 psi 0,7 to bar switches shall have two conduit entrances one for each switch compartment to facilitate the use of