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Potter VSR-F-EX-2.5, Vane-Type Waterflow Switch for 2.5-inch Steel Pipe, with Retard, SPDT

Potter VSR-F-EX-2.5, Vane-Type Waterflow Switch for 2.5-inch Steel Pipe, with Retard, SPDT

Manufacturer:Potter Electric
Manufacturer Part#:1113225
Our Part#:VSR-F-EX-25
Stock Status: Ships in 12-15 Days
Retail Price:$2,225.00
Your Savings:$756.17(34%)
Your Price:$1,468.83


Potter Electric







Feature 5


Feature 7

Switch Type:Explosion Proof Flow Switch|Pipe Type:Steel|Nominal Pipe Size:2.5|Mounting Type:Saddle|Activation Type:Vane|Activation Delay (Retard):Yes|Contact Type:SPDT


  • cUL, UL, CSFM and NYMEA Listed and FM Approved
  • Service Pressure: Up to 450 PSI (31 BAR)
  • Minimum Flow Rate for Alarm: 10 GPM (38 LPM)
  • Maximum Surge: 18 FPS (10 m/s)
  • Contact Ratings:
    • Two sets of SPDT (Form C)
    • 15.0 Amps at 125/250 VAC
    • 2.0 Amps at 30 VDC Resistive
  • Conduit Entrance: Two conduit entrances provided for ½" conduit with ½" NPT threaded connections. Use an ATEX certified plug of protection "d", "tb", and IP66 for all unused conduit openings.
  • For use in hazardous locations, Classified as:
    • Class I: Div. 1 & Div. 2, Groups C, D
    • Class II: Div. 1 & Div. 2, Groups E, F, G
    • Class III: Div. 1 & Div. 2
  • Suitable for indoor or outdoor use with factory installed gasket andcast aluminum housing
  • NEMA 4 Rated Enclosure - use with appropriate conduit fitting
  • Temperature range: 40°F / 120°F, 4,5°C/49°C
  • Non-corrosive sleeve factory installed in saddle


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

ModelPipe SizeHole Size
VSR-F-EX-22501¼ + 1⁄8 - 1⁄1633 ± 2
VSR-F-EX-33802 ± 1⁄850 ± 2
The Potter model VSR-F-EX-2.5 is a vane-type explosion proof flow switch with retard and SPDT contact(s), designed for use with 2.5-inch steel pipe.

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