VSR-AT

Auto-Test Waterflow Alarm Switch with Electronic Retard

The Model VSR-AT is an electronic vane type waterflow 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 waterflow 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 waterflow 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.

Potter's Auto-ITM line of products set a new benchmark in fire safety maintenance by automating inspection, testing, and maintenance processes to boost reliability and safety. This innovative approach reduces human error, cuts down labor costs, and enhances compliance, ensuring fire protection systems remain operational and up to code. For building owners, facility managers, and contractors, Auto-ITM delivers peace of mind, streamlining operations and supporting consistent system readiness. Embracing Auto-ITM means embracing a future where efficiency and safety lead the way in fire system maintenance.

For additional information on the VSR-AT Waterflow Alarm Switch visit our Wet Pipe System Information Portal.

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Documents & Resources

Videos

VSR-AT Installation

VSR-AT in a Normal Waterflow Event

VSR-AT Auto Test with Water Present in Pipe

VSR-AT Auto Test without Water Present in Pipe

Literature

Corrosion Solutions Catalog

Potter Academy Training

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• VSR-AT Auto-Test Waterflow Alarm Switch Curriculum