POTTER VSR-2

Product Overview

The VSR-2 is a vane-type waterflow switch engineered for wet sprinkler systems, offering reliable flow detection across a wide range of steel pipe installations. UL Listed, FM Approved, and compliant with multiple international certifications, it supports pipe schedules 10 through 40 in 2" to 8" diameters, with LPC approval for the same range. This model can also function as a sectional flow detector in larger system layouts.

Designed for accuracy, the switch activates when downstream flow reaches 10 GPM (38 LPM) and includes an instantly recycling pneumatic retard to prevent false alarms. The unit incorporates two SPDT snap-action switches, a corrosion-resistant sleeve, and a rugged NEMA 4/IP54 enclosure suitable for indoor or outdoor use. Its construction and performance meet the requirements of key NFPA standards.

Key Features

• UL, CUL, CSFM Listed; FM and LPCB Approved
• Compatible with schedules 10–40 steel pipe, sizes 2"–8"
• CE/EN12259-5 and VdS compliance via VSR-EU model
• Detects waterflow of 10 GPM (38 LPM) or higher
• Adjustable pneumatic retard for accurate alarm timing
• Nominal Pipe Size: 2 in (DN50 mm)
• Pipe O.D.: 2.375 in (60.3 mm)
• Meets NFPA-13, NFPA-13D, NFPA-13R, and NFPA-72 requirements
• Maximum service pressure: 450 PSI (31 BAR)
• Sensitivity range: 4–10 GPM (15–38 LPM)
• Maximum surge: 18 FPS (5.5 m/s)
   
• Two SPDT (Form C) switches with ratings:
  • 10 A at 125/250 VAC
  • 2 A at 30 VDC (resistive)
  • 10 mA minimum at 24 VDC
     
• Two 1/2" conduit knockouts; isolated compartments for mixed voltages
• NEMA 4/IP54 rated enclosure with die-cast housing and gasket
• Operating temperature: 40°F to 120°F (4.5°C to 49°C)
• Factory-installed non-corrosive sleeve