Field Instruments

General

The Model VSR-ST is a vane type waterflow switch for use on wet sprinkler systems that use 1", 1-1/4", 1-1/2" or 2" pipe sizes. It is equipped with a union to accommodate installation in confined spaces.

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 liters per minute) 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:

• Easy to read retard time delay adjustment knob
• 0-90 second field replaceable time delay retard
• Two SPDT (form C) contacts
• Weatherproof
• Easy to read wire terminal designations

Specifications

• Make : Potter
• Model: VSR-ST
• Connection Size:1’
• Minimum Flow for Alarm: 10 GPM (38 LPM)
• Enclosure Cover: Weather/UV/Flame Resistant High Impact Composite Base - Die-cast aluminum
• 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
• Conduit Entrances: Two 1/2” conduit connections provided. Individual switch compartments suitable for dissimilar voltages.
• Maximum Surge:18 FPS (5.5 m/s)
• Service Pressure: 300 PSI (20,68 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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