Chapter 4: Application guidelines
Alarmline II Digital Linear Heat Sensor Cable Technical Manual 31
Cold storage and freezer warehouses
Cold storage areas and freezer warehouses provide a difficult environment for
many types of fire detection due to the sub-zero operating temperatures of such
areas. With its minimum operating temperature of −40°C (−40°F) Alarmline II
Digital Sensor Cable can provide an acceptable solution, allowing it to be
installed in the risk area without being effected by the environment.
There are two ways the sensor cable can be used to provide fire detection in
such an application:
• General area coverage, or
• In-rack detection
General area coverage follows the requirements detailed in “Area coverage” on
page 11.
The alternative type of installation for these applications is storage rack
detection. As with other applications, a significant advantage of using sensor
cable is the flexibility to install it close to the point of risk. In storage areas by
being able to install the cable within the storage racking itself it is closer to the
risk and therefore able to detect an overheat or fire condition considerably
quicker than general area heat sensors. This system also allows more accurate
location of where the condition occurs.
Installation of the sensor cable can be done quickly and easily by using edge
clips to fix the cable to the framework of the racking. Ensure that the cable is
installed in a position where it is not likely to be damaged by loading and
unloading of the storage racks.
The following precautionary measures must be considered when installing the
sensor cable:
• Installation should not occur in temperatures lower than −11°C (12°F) as this
can make the cable less flexible and more prone to damage. It may be
necessary to raise the temperature of the area during installation and then
return to the normal operating temperature after installation.
• Electronic interfaces and monitoring equipment must be installed outside the
low temperature area – therefore interposing/leader cables and IP66/67
junction boxes will be required.
• The minimum bend radius at low temperatures is increased to 100 mm.
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