The Model VSR-S (EU) is a vane type waterflow switch for use on wet sprinkler systems that use 25mm (1”), 32mm (1¼”), 40mm (1½”) or 50mm (2”) pipe size. The unit may also be used as a sectional waterflow 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 flow of 38 LPM (10 GPM) or more occurs downstream of the device. The flow condition must exist for a period of time necessary to overcome the selected retard period.