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edge of the filter). The recommended method to attach the filter brackets is to tighten each
screw a little bit, going around to all six screws several times, rather than tightening first one
completely and then another screw. Tighten only enough to hold the filters gently in place.
G. REPLACING THE LAMPS
To either remove or install a
LS-60-254
,
LS-60-185
,
LM-60-312
,
LL-60-352,
or a
LL-60-
368
lamp, first unplug both the yellow, blue and black 115V AC plugs. Twist the knurled
knob attached to the cover that holds the cover on. Let the cover swing free. Reach in and
twist the lamp 90° along its axis and remove it from the lamp holders. Note, the white lamp
holders are positioned exactly a set distance apart; however, every lamp has a very slight
tolerance in length so some lamps may fit tightly in the lamp holders, and some might be
looser. The lamp manufacturer suggested that gloves be used when installing a new SW lamp
to keep fingerprints off of the lamp envelope because the oil in your fingers might block some
transmission of SW ultraviolet light. Or if you do not use gloves, the manufacturer suggested
that alcohol be used to wipe any finger marks off the SW lamp after the lamp is installed.
However, it is estimated that any finger oil would only have a very slight absorbing effect on
the SW UV, maybe only
1
/
2
% to 3%, so gloves are not absolutely necessary. Gloves are not
required for the MW, LW350, or LW370 lamps (since those wavelengths will pass through
finger oil).
The
Dual TripleBright II
has two special circuits that allow the lamps to be turned “on” and
“off” millions of times without affecting the normal life of the lamps. However, the lamps
will fail at some time, usually by failing to come “on”. A life cycle test was conducted that
operated three lamps, a
LS-60-254
, a
LM-60-312
, and a
LL-60-352
with each “on” for about
5 minutes and then “off” for about 39 seconds. The life test was stopped in Dec. 2000,
without any lamp failures and they had over 94,000 “on-off” cycles and a total of over 7,588
“on” hours each. Another life test had three
LS-60-254
lamps each “on” for 8.2 seconds and
“off” for only 1.8 seconds. That test was stopped in March 2005, with over 2.52 million “on-
off” cycles and a total of over 10,321 “on” hours
without any failures
!
The UV output of the
LM-60-312
,
LL-60-352,
and
LL-60-368
lamps will be reduced as the
lamp is used. One UV depreciation test indicates that the
LS-60-254
lamp will have about a
20% reduction in about 7,000 hours. Those same tests indicate that the
LL-60-352
lamp will
have about a 22% reduction, and the
LM-60-312
lamp will have about a 55% reduction both
in about 7,000 hours.
H.
PERIODIC MAINTENANCE
Because the fan draws in air from the outside of the case, it is important to clean the inside of
the
Dual TripleBright II
from time to time. Every six months (depending on the
environment) is suggested. The reflector, lamps, and filters should be wiped off with a clean
cloth to remove any dust. Also the SW UV might affect the blue powder coat finish that is on
the inside of the cover (in direct exposure to the SW UV) and turn it into dust, which just adds
to the dust that needs to be removed.
I. ELECTRICAL SCHEMATIC
An electrical schematic of the
Dual TripleBright II
is shown on the last page of these
instructions.
Summary of Contents for Dual TripleBright II
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