The Model VSR-M is a vane type waterflow switch for use on wet sprinkler systems. It is UL Recognized for use on the Globe Sprinkler Model UMC Manifolds.
The VSR-M contains two single pole, double throw, snap action switches and an adjustable, instantly recycling pneumatic retard. The switches are actuated when a flow of 10 GPM (38 LPM) or more occurs downstream of the device. The flow condition must exist for a period of time necessary to overcome the selected retard period.