6
£
8.
The UV-eye scanner is designed to seal off the sight pipe up to pressures of 1 PSI (.07kg/cm
2
)
when the scanner lock nut is firmly tightened. Pressures in excess of 1 PSI (.07kg/cm
2
) should
be blocked from the scanner. A quartz lens coupling (Part #60-1290) or quartz window coupling
(Part #60-1257) may be used. Each is rated from -3 to +100 PSI max. (-.2kg/cm
2
to +7kg/cm
2
max.).
9.
To increase scanner sensitivity, a quartz lens coupling (Part #60-1290) may be used. The quartz
lens permits location of the UV-eye twice the distance noted in Item 1. Use
1
/
2
s
x
1
1
/
2
s
nipple
between UV1A scanner and union. Use
3
/
8
s
close nipple and
1
/
2
s
by
3
/
8
s
bushing on UV-2 appli-
cations.
General Requirements
1.
As close as possible — 30
s
(76cm)
or closer.
2.
As cool as possible — Not over 200
q
F/93
q
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 12.
Typical Scanner Installations
Wiring of UV Scanners
The UV1A scanner is supplied with 3' (90cm) or 6' (180cm) of flexible cable. The UV-2 scanner is
supplied with 3' (90cm) 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 90
q
C, 600 volt insulation for up to 200 feet (60M)of
distance. (approx. 20% signal loss at 100 feet [30M], 40% signal loss at 200 feet [60M]).
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.
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”(152mm) OR 8”(203mm)
DO NOT EXTEND MORE THAN
HALF-WAY INTO REFRACTORY
