System Sensor EPS120 Series switches are design to supervise system air pressure in pipes or pressure tanks, as well as water or air pressure supplies of automatic water control valves. Also, the System Sensor EPS120-2 model contains two SPDT switches. The EPS120 Series features field adjustable pressure sensitivity to provide an alarm response between 10 and 200 psi. Besides, all models are factory set for use in a nominal 115 psi system. In general, the System Sensor 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 affect switch synchronization on the EPS120-2.
The model shall be an EPS120-1 or System Sensor EPS120-2 pressure-type waterflow switch as manufactured by System Sensor of St. Charles, IL. Furthermore, they shall be install on the sprinkler system with connection as shown on the drawings and/or as specified herein. Pressure switches shall be of the bellows-activated type. Switches shall have a maximum service pressure rating of 300 psi as well as shall be adjustable from 10–200 psi. There shall be one (1) or two (2) SPDT contacts rate at 10.0 Amp @ 125/250 VAC and 2.5 Amp @ 6/12/24 VDC. In addition, the contractor shall furnish and install, where indicated on the plans, pressure switches according to appropriate NFPA standards. Switches shall be provide with a ½˝ NPT male pressure connection to be connect into the air supply line on the system side of any shut-off valve.
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