Fire Detection Devices offers the standard CR 135 detector specially designed to respond to a rate of temperature increase resulting from an attack on a vault or safe door. The unit is calibrated to recognize a rate of increase of 4 Celsius degrees per minute. The Model 7050 complies with the requirements set out in UL 681. The Model 7050 is UL and ULC listed under control number 97Y8.
The Model 7050 is a combination Rate-of-Rise and Fixed Temperature detector. A set of normally open contacts will close when the surrounding air temperature increases at a (minimum) rate of 4 Celsius degrees (6 degrees F.) per minute. Closing the contacts initiates the alarm sequence. Independent of the rate-of-rise operation, the fixed temperature portion consists of a spring-loaded plunger retained by a fusible alloy that releases when the ceiling temperature reaches 57 degrees Celsius, (135 degrees F). When released, the plunger strikes the contacts and holds them closed.
The Model 7050 is installed on brackets on the door inside the vault, with the heat collector facing toward the door. It is important that the brackets are arranged so that they will not interfere with convection currents that may pass by the detector. The unit may be vestibule mounted as well providing that it is as close as possible to the vault door in the closed position.
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