Replacing The Optical Bench Uv Lamp - Teledyne T400 User Manual

5. Using an insulated pot adjustment tool, turn the UV DETECTOR GAIN
ADJUST POT until the Photo Detector signal value is as close as possible to
4600 mV. (Additional adjustments can be made by physically rotating the lamp
in its housing: loosen the UV lamp setscrew and slightly rotating the lamp up to
¼ turn in either direction while watching the signal value. Retighten setscrew
when complete).
•
6. Replace the cover on the analyzer.
5.6.9 R
EPLACING THE
This procedure details the steps for replacement of the UV source lamp in the optical
bench assembly. This procedure should be done whenever the Photo Detector signal
value can no longer adjusted to or above 3500 mV.
1. Power off the analyzer.
2. Remove the cover from the analyzer.
3. Locate the UV lamp at the front of the optical bench assembly (see Figure 2-3).
4. Unplug the lamp cable from the power supply connector on the side of the optical
5. Slightly loosen (do not remove) the UV lamp setscrew and pull the lamp from its
6. Install a new lamp in the housing, pushing it all the way in.
7. Turn the analyzer back on and allow it to warm up for at least 15 minutes.
8. Navigate to Utilities>Diagnostics>Analog Inputs>Photo Detector.
9. Turn the UV GAIN ADJUSTMENT POT (Figure 5-8) clockwise to its minimum value
10. While ensuring that the new lamp is pushed all the way into the housing, slightly
11. At the point where the Photo Detector signal reaches minimum observed value,
12. Using an insulated pot adjustment tool, turn the UV DETECTOR GAIN ADJUST
13. Replace the cover on the analyzer.
083730400A DCN8130
If a minimum reading of 3500.0 mV cannot be reached, the lamp must be
replaced.
O B
PTICAL ENCH
CAUTION – UV Radiation Risk
Power off the instrument before proceeding with lamp replacement.
When the instrument is powered back on during this procedure, do
not look directly at the light of the UV lamp. Use safety glasses rated
for UV protection while performing the adjustments.
bench.
housing.
Leave the UV lamp setscrew loose for now.
•
(the pot should click softly when the limit is reached).
rotate the lamp up to ¼ turn in either direction until the MINIMUM Photo Detector
signal value is observed.
tighten the lamp setscrew at that position.
POT (Figure 5-8) until the Photo Detector signal value is as close as possible to
4600 mV.
Teledyne API – Model T400 O
UV L
AMP
Analyzer
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