Spectrex 20/20U (UB) - UV Flame Detector - Manual (Page 29)

Spectrex Inc. - SharpEye™ UV Flame Detector Manual – TM 20/20UB Rev. E, August 2004
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6.3 Preparations For Installation
Installation should comply with NFPA 72E, as applicable to flame detectors.
The detectors can be installed with the use of general-purpose common tools
and equipment.
1 Verify the appropriate Purchase Order. Record the part number and Serial
number of the detectors and the installation date in the appropriate Log-
book.
2 Open the container package prior to detector installation and visually inspect
the detector.
3 Verify that all components required for the detector installation are readily
available before commencing the installation. In case that the installation is
not completed in a single session, secure and seal detectors and conduits.
4 For wiring, use color coded conductors or suitable wire markings or labels.
Wire diameter between 12 to 20 AWG (3.1 x to 0.5 mm 2 ) may be used for
site wiring. The selection of wire gauge should be based on the number of
detectors used on the same line and the distance from the control unit, in
compliance with specifications (see Appendix A)
6.4 Conduit Installation
1 To avoid water condensation in the detector, it should be installed with the
conduits placed downward, and should include drain holes.
2 When using the optional swivel mount, use flexible conduits for the last
portion connecting to the detector.
3 For installations in atmospheres as defined in Group B of the NFPA, conduit
inlets should be sealed.
4 When pulling the cables through the conduits, ensure that they are not
tangled or stressed. Extend the cables about 12 in. (30 cm.) beyond the
detector location to accommodate wiring after installation.
5 After the conductor cables have been pulled through the conduits, perform a
continuity test.