The Potter Amseco VSR-4 is a vane type water-ow switch for use on wet sprinkler systems. It is UL Listed and FM Approved for use on steel pipe; schedules 10 through 40, size 4" (50 mm thru 20 mm).The VSR-4 may also be used as a sectional water-ow detector on large systems. The unit contains two single pole, double throw, snap action switches and an adjustable, instantly recycling pneumatic retard. The switches are actuated when a -ow of 10 GPM (38 LPM) or more occurs downstream of the device. The -ow condition must exist for a period of time necessary to overcome the selected retard period. Also known as -POTTER VSR-4 WATERFLOW SWITCH 4"VANE TYPE WITH RETARD
