The Model VSR-FEX is a vane type waterflow switch for use on wet sprinkler systems located in hazardous locations as shown above. 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 10 gallons per minute (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.
The unit is enclosed in a cast aluminum housing. The cover is held in place with six M6 x 1mm-6g; 30mm long socket head cap screws with a 5mm hexagonal drive head and a property class of 8.8. These screws can only be replaced with identical ones.
Compatible Pipe/Installation Requirements