Field Instruments

General

The Model VSR is a vane type water flow switch for use on wet sprinkler systems. It is UL Listed for use on a steel pipe; schedules 5 through 40, sizes 2" - 6" and is UL Listed and FM Approved for use on steel pipe; schedules 10 through 40, sizes 2" thru 8" (50 mm thru 200 mm). LPC approved sizes are 2" thru 8" (50 mm thru 200 mm).

The VSR may also be used as a sectional water flow detector on large systems. The VSR 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.

Features:

• Assembled in USA
• 0-90 second field replaceable time delay retard
• Easy to read retard time delay adjustment knob
• UL Listed models for 2"-6" steel pipe schedules 5 through 40
• UL Listed and FM approved models for 2"-8" steel pipe schedules 10 through 40
• Two SPDT (form C) contacts
• Weatherproof
• Easy to read wire terminal designations

Specifications

• Make : Potter
• Model: VSR-3 1/2
• Nominal Pipe Size: 3 1/2” ,
• Conduit Entrances: Two knockouts provided for 1/2" conduit. Individual switch compartments suitable for dissimilar voltages
• Contact  Ratings:  Two sets of SPDT (Form C) 10.0 Amps at 125/250VAC 2.0 Amps at 30VDC  Resistive 10 mAmps min. at 24VDC
• Enclosure Cover - Weather/UV/Flame Resistant High Impact Composite Base - Die-cast aluminum
• Environmental Specifications NEMA 4/IP54 Rated Enclosure suitable for indoor or outdoor use with factory installed gasket when used with appropriate conduit fitting.
• Temperature Range:  40°F - 120°F, (4.5°C - 49°C) - UL Non-corrosive sleeve factory installed in saddle.
• Flow Sensitivity Range for Signal 4-10 GPM (15-38 LPM) – UL
• Maximum Surge:18 FPS (5.5 m/s)
• Service Pressure: 450 PSI (31 BAR) – UL
• Service Use:
  • • Automatic Sprinkler: NFPA-13
    • One or two family dwelling: NFPA-13D
    • Residential occupancy up to four stories: NFPA-13R
    • National Fire Alarm Code: NFPA-72

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