POTTER VSG-4

Product Overview

The VSG-4 is a flexible vane-type waterflow switch engineered for wet pipe water mist systems that require reliable alarm activation at very low flow rates. Designed for installation on 4-inch stainless steel or brass piping, it fits systems built within specific wall-thickness parameters. Its durable die-cast enclosure, factory-installed gasket, and non-corrosive internal components make it suitable for both indoor and outdoor environments. Additionally, the model can serve as a sectional waterflow detector in larger system layouts.

Key Features

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Listings & Approvals: UL, ULC, and CSFM certified

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Pipe Compatibility: 4" pipe (114.3 mm OD) with wall thickness from 5.4 mm to 6.4 mm

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System Performance:

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Service pressure up to 450 PSI (31 bar)

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Alarm activation at 3.0 GPM (11.4 LPM)

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Maximum surge velocity of 18 FPS (5.5 m/s)

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Electrical Requirements:

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Standby: 10 mA at 120 VAC or 1.5 mA at 24 VAC/DC

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Alarm: 40 mA at 120 VAC or 35 mA at 24 VAC/DC

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Contacts: DPDT (Form C), rated 2 A at 0–30 VDC or 0–125 VAC (resistive)

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Installation Details:

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Includes two ½" conduit knockouts

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NEMA 4 enclosure rating with proper conduit fitting

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Factory-installed non-corrosive sleeve in saddle

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Environmental Specifications:

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Temperature range: 40°F to 120°F (4.5°C to 49°C)

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Suitable for indoor or outdoor applications

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Important Notice: Not designed for use in hazardous or explosive environments