The FM-approved FireChek® thermal shut-offs with resettable memory shape alloy can be used to automatically shut down a pneumatic control system when a nearby fire occurs or when the ambient temperature reaches 135, 150, or 165°F. When excessive heat is sensed from a nearby fire, the air supply line is immediately closed, preventing air from feeding the fire. The system simultaneously vents the spring return actuator to allow the return to fail-safe. The system triggers quickly, securing pneumatically operated process line valves in their fail-safe position for both on/off and throttling applications. The system responds to heat, not flame, offering improved protection compared with conventional plastic tubing burn-through.
The shape memory element senses the ambient temperature and, through a phase induction change, rapidly produces the force and motion to trigger the FireChek. The element is 100% reliable because the shape memory effect is intrinsic to the alloy. The manual reset of the system allows routine performance for safety maintenance programs. Three configurations of the product are available.