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  • A photograph of an AP615 Flow Switches installed on piping in the field.

Guardian AP275-615 and AP275-617 Series Flow Switches for Emergency Equipment

Item #: AP275-615

Normal Availability: 1-2 business days

Product Description


The Guardian Equipment 615 and 617 series flow switches are designed to sense the activation of emergency equipment such as combination safety stations, eye/face washes, drench hoses, and safety showers. The switch can be used to activate a local alarm system, or send an electrical signal to a remote monitoring system.  Several models are available:

  • AP275-615 - A single pole, double throw flow switch for 1-1/4" IPS pipe typically found on the combination safety stations.
  • AP275-615C1D2 - Same as the AP275-615, but designed for Class 1 division 2 Environments
  • AP275-617 - Same as the AP275-615 but with a double pole, double throw switch.
  • AP280-615 - A single pole, double throw flow switch for 1" IPS pipe typically found on safety showers.
  • AP285-615  - A single pole, double throw flow switch for 1/2" IPS pipe typically found eye/face wash stations (pricing is the same as the AP275-615).

Single pole switches have one set of leads for connection to either a local or remote alarm system. Double pole switches have two sets of leads for connection to both a local and remote alarm system.


Application: Single pole, double throw flow switch for use with emergency equipment. The flow switch is installed in the water supply line upstream of emergency unit. When the unit is activated, the switch senses the movement of water in the supply line. The switch can be used to activate a (user-supplied) alarm horn and light, and sends electrical signal to monitoring system.

Installation: The flow switch is mounted in a tee fitting that is installed in the water supply line to emergency unit. The switch must be installed with the tee fitting in the horizontal position, the flow switch body in vertical position, and at least 6" from the closest fitting. The direction of flow is marked on the switch body. Standard versions have a weatherproof electrical junction box with gasketed cover. The switch operates at 125 volt up to a 5 amp max electrical connection.

Activation Range:

  • AP275-615 activates at 2.4 GPM, deactivates at 2.0 GPM.
  • AP280-615 activates at 3.0 GPM and deactivates at 1.75 GPM.
  • AP285-615 activates at 1.5 GPM and deactivates at 1 GPM.

Quality Assurance: Each unit is fully assembled, wired and factory tested prior to shipment.

Documentation available: Specification sheet for the AP275-615

Common replacement parts: None are required under normal conditions of use.

All Guardian items are manufactured in the USA. This item ships in a box approximately 13" x 12" x 4" (33 x 31 x 10 cm) weighing approximately 5 lb (2.2 kg).

Warranty Information

2-year limited manufacturer warranty.

Other Details

Manufactured in: USA

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