MANUAL NUMBER 160339
REVISION 09SEPT04 PAGE 8
LINEAR THERMAL DETECTOR (LTD)
The Linear Thermal Detector (LTD) is a twin conductor cable with temperature-sensitive
insulation protected by an outer sheath. It operates by short-circuiting in a fire or overheat
condition. The LTD provides economical detection in vehicle engine bays, fuel storage tanks
and any other location where the threat of fire exists. The LTD is capable of detecting a fire at
any point along its length and will react to a fire situation within 20 seconds. The cable is not
resettable however. If the wire alarms to a fire, the wire must be replaced or the damaged
section cut out and a new section added prior to returning the system to service. The added
section can be ordered as 420413-x where x indicates the length in feet required. Interface
connectors must be added to the original LTD. LTD’s are shock and vibration resistant.
FIGURE 4 – LINEAR THERMAL DETECTOR
END-OF-LINE DEVICE
The End-of-Line device is required for supervision of the fire detection circuits. It
consists of a resistor installed into a connector and is environmentally sealed with potting
compound. The End-of-Line device is installed on the last detector in each series of detectors.
FIGURE 5 – END-OF-LINE DEVICE
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