Description
Linear Heat Sensing Cable Conventional Type – Overview
Linear Heat Detection (LHD) is a continuous heat detector in the form of a cable. It can detect heat at any points along its entire length. It is composed of Linear Heat Sensing Cable (LHSC), adapter unit and termination unit. The digital LHSC is composed of two twisted shield conductors insulated with a heat sensitive material, then wrapped with a protective tape and finished with an outer jacket. The heat sensitive material will soften and fuse at specific fixed temperature which causes the contact of the conductors, the short circuit will trigger an alarm to the Fire Alarm Control Panel (FACP), thus realize the function of fire detection and warning.
Technical Specification
| Material of Core Conductor | Steel | |||
|---|---|---|---|---|
| Diameter of Core Conductor | 0.92 mm (0.04″) | |||
| Length of Cable | 200 m (656 ft), 500 m (1640 ft) | |||
| Resistance of Core Conductor (Two-cores, 25°C) |
0.64 ± 0.06 Ω/m | |||
| Min Bend Radius | 15 cm (5.9″) | |||
| UL Approvals / Max. Listed Spacing | 15.2 m (50 ft) | |||
| Alarm Temperature | 68°C (154°F) | 88°C (190°F) | 105°C (221°F) | 138°C (280°F) |
| Accuracy | ±3°C (±5.4°F) | ±5°C (±9.0°F) | ±5°C (±9.0°F) | ±5°C (±9.0°F) |
| Responding Time | ≤ 10 s | ≤ 10 s | ≤ 15 s | ≤ 20 s |
| Color of Outer Jacket | Blue | Red | White | Yellow |
| Operating Temperature | −40°C to +45°C (−40°F to +113°F) | −40°C to +60°C (−40°F to +140°F) | −40°C to +75°C (−40°F to +167°F) | −40°C to +93°C (−40°F to +199.4°F) |
| Storage Temperature | −20°C to 50°C (−4°F to +122°F) | |||
| Operating Humidity | ≤ 95% RH (non-condensing) | |||
