Chapter 1: Introduction
Alarmline II Digital Linear Heat Sensor Cable Technical Manual 5
Alarm temperature Outer coating Spacing
105°C (221°F) Nylon Maximum spacing 4.5 m (15 ft.)
between sensor cable runs for
general area coverage
185°C (365°F) Nylon Proximity detection only
18 218°C (424°F) Silicone Proximity detection only
FM approvals
The sensor cables listed below have been tested and approved by FM (Fire
Detection, Heat Activated).
Table 3: FM approvals
Alarm temperature Outer coating Spacing
68°C (155°F) PVC Maximum spacing 9 m (30 ft.)
between sensor cable runs for
general area coverage
88°C (191°F) PVC Maximum spacing 9 m (30 ft.)
between sensor cable runs for
general area coverage
105°C (221°F) PVC Maximum spacing 7.6 m (25 ft.)
between sensor cable runs for
general area coverage
235°C (455°F) Silicone Proximity detection only
Technical specifications
Table 4: AD68 range
AD68 AD68N AD68P AD68SS
68°C (155°F)
PVC Nylon Polypropylene
Stainless steel
over PVC
Red Black Red Red
3.6 mm
(±0.12 mm)
0.142 in.
(±0.005 in.)
4.44 mm
(±0.12 mm)
(0.175 in.
(±0.005 in.)
4.5 mm
(±0.12 mm)
(0.177 in.
(±0.005 in.)
4.1 mm
(±0.12 mm)
(0.161 in.
(±0.005 in.)
2 × tri-metallic conductors Ø 0.912 mm (0.036 in.)
45°C (113°F) max.
−10°C (14°F) min.