Potter Electric Signal VSR-ST Waterflow Alarm Switch

Product Description

The Potter Electric Signal Co. VSR-ST is a vane type waterflow alarm switch designed for use in wet-pipe fire sprinkler systems. When water flows through the pipe, the internal paddle vane deflects and actuates the switch, signaling the fire alarm control panel. The VSR-ST is built for reliable detection of sustained waterflow events while providing a retard mechanism to prevent false alarms from pressure surges or minor fluctuations. Installation and commissioning are performed by licensed fire protection contractors and NICET-certified technicians.

The VSR-ST is intended for wet-pipe fire sprinkler systems in residential and commercial applications. It mounts directly to the sprinkler piping and connects to the building fire alarm system to provide supervisory or initiating zone signals. The switch is suited for horizontal or vertical pipe runs where flow detection is required at a branch, main, or riser location. Specific pipe size compatibility and mounting requirements should be confirmed against the manufacturer data sheet prior to installation.

Key Features

• Vane actuation design responds to sustained waterflow while resisting false trips from transient pressure surges
• Integral retard adjustment allows field calibration to match system pressure characteristics
• Designed for wet-pipe sprinkler system applications in residential and commercial buildings
• Signals fire alarm control panels upon waterflow detection for fast notification
• Sold as a single unit for direct replacement or new installation

Compatibility

Designed as an OEM-style replacement or new-installation waterflow alarm switch for wet-pipe fire sprinkler systems. Confirm pipe size and system pressure ratings against the manufacturer data sheet before installation.

Installation Notes

Installation must be performed by a qualified fire protection contractor in accordance with NFPA 13 and applicable local codes. Shut down and drain the affected sprinkler zone before cutting into the piping. Verify that the electrical connections to the fire alarm control panel comply with NEC wiring requirements for fire alarm circuits. Do not operate the vane mechanism dry or force the paddle beyond its designed travel range.