FireChek® thermal shutoffs 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. The testability and reset ability of the FireChek make it a preferred choice over emergency isolation valves that rely on fusible links or plastic burn-through tubing.
When the FireChek senses excessive heat from a nearby fire, it immediately closes the air supply line preventing the air from feeding the fire. It simultaneously vents the spring return actuator to allow the return to fail-safe position. The FireChek triggers quickly, securing pneumatically operated process line valves in their fail-safe position for both on/off and throttling applications. Because FireChek responds to heat, not flame, it offers dramatically improved protection compared with conventional plastic tubing burn-through.