56
Teledyne API Model 465M O
3
Monitor User Manual
06160J DCN7969
9.4.
UV Lamp Adjustment
CAUTION – GENERAL SAFETY HAZARD
Do not look at the UV lamp while the unit is operating. UV light can
cause eye damage. Always use safety glasses made from UV blocking
material. (Generic plastic glasses are not adequate).
WARNING - RISK OF ELECTRICAL SHOCK
HIGH VOLTAGE MAY BE PRESENT WHEN POWER IS CONNECTED TO
THE INSTRUMENT!
1.
Instrument should be running and warmed up for at least 20 minutes.
2.
With instrument running, remove the six screws and the top cover (Rack Mount
Configuration) or open front panel (NEMA Configuration.)
3.
Locate the Reference UV Detector adjustment pot, PR3, on the Mainboard PCA
(see Figure 9-1 or Figure 9-2.)
4.
Navigate the front panel menu to VIEW menu and scroll to REF display and press
ENT
. At this point there should be a scrolling display similar to “REF = XXXX
MV.” See Section 7.2 for details on menu navigation.
5.
While observing the REF value on the display, slowly turn the pot to adjust the
value. The target adjustment range is as high as possible within the range of
800
– 1150 mV.
6.
Locate the Measure UV Detector adjustment pot, PR4, on the mainboard PCA
(see Figure 9-1 or Figure 9-2.)
7.
Navigate the front panel menu to VIEW menu and scroll to MEAS display and
press
ENT
. At this point there should be a scrolling display similar to “MEAS =
XXXX MV.” See Section 7.2 for details on menu navigation.
8.
While observing the MEAS value on the display, slowly turn the pot to adjust the
value. The target adjustment range is as high as possible within the range of
800
– 1150 mV.
9.
If the required adjustment cannot be achieved by adjusting the UV Detector pot
alone, then additional adjustment can be made by loosening the two UV lamp
setscrews on the UV lamp housing (see Figure 9-1 or Figure 9-2) and rotating the
lamp. Rotate the lamp very slowly while observing the REF or MEAS value on
the display. Make sure the lamp does not pull out and remains seated in the
housing while it is being rotated. Re-tighten the two setscrews when a desired
point has been reached.
10.
If necessary, additional “fine tuning” can now be done with the UV Detector
adjustment pots per steps 4-8.
11.
Re-Install instrument cover and observe REF and MEAS values on display for a
couple minutes to verify it does not drift out of the adjustment range.