Installing The Detector; General Guidelines - Emerson Rosemount 975UF Reference Manual

Reference Manual
00809-0100-4977
2

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.
2.1

General guidelines

To ensure optimal performance and an efficient installation, consider the following
guidelines:
• Sensitivity: To determine the level of sensitivity, consider the following:
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• Wiring:
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• Spacing and location: The number of detectors and their locations in the protected
area are determined by:
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• Environment:
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• Aiming the detector:
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Installations must comply with National Fire Protection Agency (NFPA) 72E or any other
local and international regulations and standards, as applicable to flame detectors and
installation of Ex approved products.
Rosemount 975UF
Size of fire at the required distance to be detected
Type of flammable materials
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
instructions.
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. Ground the shield at the detector end.
Size of the protected area
Sensitivity of the detectors
Obstructed lines of sight
Cone of view of the detectors
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.
Aim the detector toward the center of the detection zone and make sure the view
of the protected area is completely unobstructed.
Whenever possible, tilt the detector face down at a 45-degree angle to maximize
coverage and prevent accumulation of dust and dirt.
Take into account all conceivable considerations regarding detection location
before starting an installation.
Installing the detector
June 2021
Wiring
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