Installing the Detector
TM40/40U Rev. (Af), February 2019
33
3
Installing the Detector
This chapter provides basic guidelines for installing the detector. It does not
attempt to cover all of the standard practices and codes of installation. Rather, it
emphasizes specific points of consideration and provides some general rules for
qualified personnel. Wherever applicable, special safety precautions are stressed.
3.1
General Guidelines
To ensure optimal performance and an efficient installation, consider the
following guidelines:
3.1.1
Sensitivity
•
To determine the level of sensitivity, consider the following:
•
Size of fire at the required distance to be detected
•
Type of flammable materials
3.1.2
Wiring
•
The wire gauge must be designed according to the distance from the detector
to the controller and the number of detectors on the same power line. See
on page 61.
•
To fully comply with EMC directive and protect against interference caused by
RFI and EMI, the cable to the detector must be shielded and the detector
must be grounded. The shield should be grounded at the detector end.
3.1.3
Spacing and Location
•
The number of detectors and their locations in the protected area are
determined by:
•
Size of the protected area
•
Sensitivity of the detectors
•
Obstructed lines of sight
•
Cone of view of the detectors
3.1.4
Environment
•
Dust, snow, or rain can reduce the detector
’
s sensitivity and require more
maintenance activities.
•
The presence of high intensity flickering IR sources may affect sensitivity.
