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TROUBLESHOOTING & REPAIR Teledyne API - T100H Addendum to T100 Operation Manual)
48
10.3.2.1. Adjusting the UV Lamp (Peaking the Lamp)
There are two ways in which ambient conditions can effect the UV Lamp output and therefore the accuracy of the
SO
2
concentration measurement: Lamp Aging and Lamp Positioning.
Lamp Aging - Over a period of months, the UV energy will show a downward trend, usually 30% in the first 90
days, and then a slower rate, until the end of useful life of the lamp. Periodically running the UV lamp calibration
routine (see Section 6.9.7) will compensate for this until the lamp output becomes too low to function at all.
Lamp Positioning – The UV output level of the lamp is not even across the entire length of the lamp. Some
portions of the lamp shine slightly more brightly than others. At the factory the position of the UV lamp is
adjusted to optimize the amount of UV light shining through the UV filter/lens and into the reaction cell. Changes
to the physical alignment of the lamp can affect the analyzers ability to accurately measure SO
2
.
UV Lamp Bracket
Mounting Screws
Shutter
Housing
Shutter Assy
UV Filter Retainer
& Lens Housing
UV Lamp Power
Supply Wires
Thumb
Screw
DO NOT
use Lamp Cap to
adjust Lamp
position
Reaction
Cell
Adjust Lamp
Position by
grasping lamp
body ONLY
Beam
Splitter
Reference
Detector
Housing
Reference
Detector
PCA
Figure 10-3: Shutter Assembly - Exploded View
CAUTION:
ALWAYS wear UV-Protective, Safety Glasses when working with the UV Lamp Assembly
1. Set the analyzer display to show the signal I/O function, UVLAMP_SIGNAL (see Section 11.1.3).
UVLAMP_SIGNAL is function 33.
2. Slightly loosen the large brass thumbscrew located on the shutter housing (see Figure 10-3) so that the
lamp can be moved.
3. While watching the UVLAMP_SIGNAL reading, slowly rotate the lamp or move it back and forth vertically
until the UVLAMP_SIGNAL reading is at its maximum.
DO NOT grasp the UV lamp by its cap when changing its position (see Figure 10-3).
Always grasp the main body of the lamp.
4. Compare the UVLAMP_SIGNAL reading to the information in Table 10-3 and follow the instructions there.
07265A DCN6038