Uv Source Lamp Replacement; Figure 8-5: Photometer Assembly - Lamp Adjustment / Installation - Teledyne T700 Operation Manual

Teledyne API – Model T700 Dynamic Dilution Calibrator
Figure 8-5: Photometer Assembly – Lamp Adjustment / Installation

8.2.4. UV SOURCE LAMP REPLACEMENT

06873E DCN7106
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 8.2.3.
1. Turn the calibrator off.
2. Remove the cover from the calibrator.
3. Locate the Optical Bench Assembly (see Figure 3-6).
4. Locate the UV lamp at the front of the optical bench assembly (see Figure 8-5).
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 the new lamp in the housing, pushing it all the way in. Leave the UV lamp
setscrew loose for now.
8. Turn the calibrator back on and allow it to warm up for at least 30 minutes.
9. Turn the UV detector gain adjustment pot (See Figure 8-5) clockwise to its minimum
value. The pot may click softly when the limit is reached.
10. Perform the UV Lamp Adjustment procedure described in Section 8.2.3, with the
following exceptions:
a) Slowly rotate the lamp in its housing (up to ¼ turn in either direction) until a
MINIMUM value is observed.

Ensure 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 Teledyne API‟S Technical Support for assistance.
b) 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.
c) Adjust PHOTO_DET within the range of 4400 – 4600 mV.
11. Replace the cover on the calibrator.
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.
CAUTION
Maintenance
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