Product Overview
7
®
General Requirements
1. As close as possible — 30sor closer.
2. As cool as possible — Not over 200q F (93q C).
3. Avoid sighting the spark — Resight scanner, shield between spark and scanner, or orifice to
reduce reflected signal from spark.
4. Must see pilot and/or main flame — Scanner view must be unobstructed,
5. Minimum pilot test — See page 22.
Typical Scanner Installations
Wiring of UV Scanners
The UV1A scanner is supplied with 36” or 72” of flexible cable. The UV-2 scanner is supplied with
36” of flexible cable. If it is necessary to extend the scanner leads, the following instructions apply:
1. Scanners without armored cable must be wired using metal cable or rigid conduit.
2. High voltage wiring must not be installed in the same conduit with flame detector wiring.
3. Selection of Scanner Wire:
a. Use #14, 16, or 18 gauge wire with 90q C, 600 volt insulation for up to 200 feet of distance.
(approx. 20% signal loss at 100 feet, 40% signal loss at 200 feet).
b. Asbestos insulated wire should not be used.
c. Multi-conductor cable is not recommended without prior factory approval.
d. High voltage ignition wiring should not be installed in the same conduit with flame detector
wires.
SCANNER MUST HAVE UNOBSTRUCTED
VIEW OF FLAME
NOT THIS NOT THIS BUT THIS
FLAME MUST COMPLETELY COVER
SIGHT OPENING
NOT THIS
NOT THIS BUT THIS
The maximum UV signal
from a flame is found in
the first one-third of the
visible flame taken from
the point where the flame
begins. The scanner sight
pipe should be aimed at
this area.
SCANNER
METHODS OF COOLING SCANNER
INSULATING
TUBING
SEALING UNION
FORCED
AIR
EXTEND SIGHTING TUBE
6”(152.4mm) OR 8”(203.2mm)
DO NOT EXTEND MORE THAN
HALF-WAY INTO REFRACTORY