Linear Detection Wire
The linear detection wire consists of two, spring steel conductors that are separated by a heat-sensitive insulator. At the temperature rating of the wire, 356 °F (180 °C), the insulator melts, allowing the two conductors to make contact. This contact provides electrical continuity between the two conductors. The linear detection wire is supplied in lengths of 100 ft (30.5 m) or 500 ft (152.4 m) and must be ordered separately.
Spot Thermal Detection
Thermal Detectors are normally open, contact closure devices. The fixed temperature design of these detectors will cause the contacts to close when the temperature of the surrounding air reaches the set point temperature of the detector. Thermal detectors are available in three preset temperatures, 270 °F (132 °C), 325 °F (163 °C), and 360 °F (182 °C).
The CHECKFIRE MP-N offers two reliable forms of detection used individually or in combination.
Linear Wire Detection consists of two spring-steel conductors separated by a heat sensitive insulator. At the temperature rating of the wire, 356 °F (180 °C), the insulator melts and the two conductors make contact, sending a signal to the detection module which signals the control module to actuate the fire suppression system.
With Spot Thermal Detection, the thermal detector contacts close and signal the control module to initiate fire suppression when the temperature reaches either 250 °F or 350 °F (121 °C or 177 °C) depending on the model selected.