Det-Tronics SW9200x Slickwatch IR Oil Detection System - Manual (Page 14)

SCHEDULED MAINTENANCE
NOTE
To avoid dropping assemblies, tools, etc., into the
water, it is recommended that all maintenance pro-
cedures be accomplished with the mount and
instrument rotated up to face the technician.
It is recommended that the following maintenance pro-
cedures be performed periodically as described:
Maintenance Procedure Scheduled Interval
12 mo. 24 mo.
Clean exterior optical components X
Clean interior optical components X
Replace filterwheel motor X
Replace 250W lamp* X*
Replace desiccant X
* Interval is dependent on line voltage (see Replacement
of Transmitter Lamp procedure).
CLEANING OF OPTICAL COMPONENTS
Exterior (12 month interval) - Due to the gradual accumu-
lation of dust, chemical deposits, or other foreign matter,
the exterior optical surfaces must be cleaned at least
every twelve months. In some applications, cleaning of
the windows may be required more frequently. The
need for cleaning can usually be detected by a gradual
decrease in the NUMERATOR and DENOMINATOR out-
puts and/or by visual inspection of the optical surfaces.
1. Disconnect all power to the instrument.
NOTE
If possible, direct a flow of clean, oil-free com-
pressed air onto the optical surfaces before and
after cleaning.
2. Clean the outer surfaces of the transmitter and
receiver windows with clean cotton swabs and alco-
hol. Finish with clean optical tissue. DO NOT
TOUCH the windows or other optical surfaces with
bare hands.
3. Reconnect the instrument and reapply power.
Interior (24 month interval) - Interior optical components
(inside surface of window, lens, filters and sync pickoff)
should be cleaned every two years. Although it is possi-
ble to perform all these procedures on-site, a lab envi-
ronment is preferable as it is cleaner and easier to work
in. (See ACCESS TO INTERNAL COMPONENTS.)
Window
Interior windows are reached by removal of the transmit-
ter and receiver window assemblies. Clean as
described in exterior optical cleaning procedure above.
Lens, Sync Pickoff and Optical Filters
1. Remove motor and filterwheel by following
Replacement of Filterwheel Motor procedure.
2. The lens is located in the center of the receiver
baseplate. Using clean cotton swabs and alcohol,
clean both sides of the lens. Finish with clean opti-
cal tissue.
3. The sync pickoff is located at the center of the Rear
Panel p.c. board on the inside of the motorbox. The
optical surfaces are located on the inside of the “U”
shaped device. Using clean cotton swabs and alco-
hol, clean both optical surfaces of the sync pickoff.
Remove any excess alcohol and completely dry the
surfaces with clean, dry cotton swabs.
4. The optical filters are located in the filterwheel,
which is attached to the motor shaft. Clean both
sides of each filter using clean cotton swabs and
alcohol. Finish with clean optical tissue.
REPLACEMENT OF FILTERWHEEL MOTOR (12 month
interval)
It is recommended that this procedure be performed in a
lab environment. (See ACCESS TO INTERNAL COMPO-
NENTS). Cleaning of interior optical components should
be done after the filterwheel motor is removed. Power
should be disconnected for this procedure.
1. The receiver cover and internal components should
be placed so that the open side of the motorbox
faces the technician and so that the power supplies
are to the left. The assembly should be securely
propped during this procedure to avoid damage to
the internal components.
2. Remove the Sync Demod and Options p.c. boards
and disconnect the motor connectors. Note the
routing of the wires.
3. While holding the motor still, remove the four 6-32
screws that attach the motor and standoffs to the
front panel.
13 95-8409