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M400E Ozone Analyzer Operator’s Manual Maintenance Schedule & Procedures
Figure 12-3: Optical Bench – Lamp Adjustment/ Installation
12.3.6.3. UV Lamp Replacement
This procedure details the steps for replacement of the UV source lamp in the optical bench assembly. This
procedure should be done whenever the lamp can no longer be adjusted as described in Section 12.3.6.2.
1.
Turn the analyzer off.
2. Remove the cover from the analyzer.
3. Locate the Optical Bench Assembly (see Figure 3-4).
4.
Locate the UV lamp at the front of the optical bench assembly (see Figure 11-16)
5.
Unplug the lamp cable from the power supply connector on the side of the optical bench.
6. Slightly loosen (do not remove) the UV lamp setscrew and pull the lamp from its housing.
7. Install a new lamp in the housing, pushing it all the way in.
Leave the UV lamp setscrew loose for now.
8. Turn the analyzer back on and allow it to warm up for at least 15 minutes.
9. Turn the UV detector gain adjustment pot (See Section 12.3.6.2) clockwise to its minimum value. The
pot sho
uld click softly when the limit is reached.
10. Perform the UV Lamp Adjustment procedure described in Section 12.3.6.2 with the following exceptions:
e)
Slowly rotate the lamp in its housing (up to ¼ turn in either direction) until a
MINIMUM value is
observed.
Make sure the lamp is pushed all the way into the housing while performing this rotation.
If the
PHOTO_DET will not drop below 5000 mV while performing this rotation, contact T-API
Customer Service for assistance.
f) Once a lamp position is found that corresponds to a minimum observed value for
PHOTO_DET,
tighten the lamp setscrew at the approximate minimum value observed.
g) Adjust
PHOTO_DET within the range of 4400 – 4600 mV.
11. Replace the cover on the analyzer.
NOTE
The UV lamp contains mercury (Hg), which is considered hazardous waste. The lamp should be
disposed of in accordance with local regulations regarding waste containing mercury.
04315 Rev. C1 229