Description
The Reliable Model F1-FTR Fixed Temperature Release Pilot Line Detector (PLD) is designed to be used on wet or dry pilot line release systems to trigger the operation of deluge and preaction fire protection systems. It is identified as a fixed temperature release pilot line detector to differentiate it from a sprinkler.
The FTR incorporates a very sensitive 2.5 mm glass bulb in a Model F1 Sprinkler frame. During fire conditions, the heat sensitive liquid in the bulb expands until the bulb shatters, releasing the cap and spring assembly. This releases the hydraulic or pneumatic pressure holding the deluge valve closed, causing the valve to open and deliver water to the fire protection system discharge devices.