Field Instruments

General

The Model VSR-AT is an electronic vane type water flow switch for use on wet sprinkler systems which may be remotely tested without flowing water. It is UL Listed and FM Approved for use on steel pipe schedules 10 thru 40 sizes 2" thru 8". See ordering Information chart. The VSR-AT may also be used as a sectional water flow detector on large systems. The VSR-AT has two sets of alarm contacts and an adjustable instantly recycling electronic retard. The alarm contacts 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 time.

The VSR-AT may be remotely tested without flowing water by using the optional auto test Control model ATC-1 or ATC-4 or the use of addressable relays and monitor modules as part of a listed addressable fire alarm panel.

When the auto test feature is initiated, the VSR-AT performs a self test to ensure compliance with UL requirements regarding water flow detection and retard time. In addition, the auto test feature ensures the integrity of the paddle/trip stem assembly. A successful completion of the auto test will activate both sets of normally open contacts on the flow switch. If the auto test detects a problem with the trip stem/paddle assembly or if there is no water in the pipe, neither normally open contact will operate and the flow switch will indicate a trouble condition at the test switch and transmit a trouble signal to the fire alarm panel.

Features:

• Assembled in USA
• Can be remotely tested without flowing water
• 0-90 second field replaceable time delay retard
• 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 AT-2
• Nominal Pipe Size: 2” , DN50
• 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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