user manual

Maintenance Schedule & Procedures Teledyne API T703 Calibrator Operation Manual

186

Figure 10-3: Photometer – Location of UV Detector Gain Adjustment & UV Lamp Set Screw

10.6. PHOTOMETER UV SOURCE 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 10.2.3.

1. Turn the analyzer off.

2. Remove the cover from the analyzer.

3. Locate the Optical Bench Assembly (see Figure 3-5)

4. Locate the UV lamp at the rear of

the optical bench assembly (see Figure 10-3)

Unpl

ug 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 analyzer back on and allow it to warm up for at least 15 minutes.

9. Turn the UV detector gain adjustment pot (See Figure 10-3) clockwise to its minimum value. The pot

sho

ld click softly when the limit is reached.

10. Perform the UV Lamp Adjustment procedure described in Section 10.5, with the following exceptions:

Slowly rotate the lamp in its hou

sing (up to ¼ turn in either direction) until a MAXIMUM

value (or 4600

mVDC) 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.

Once a lamp position is found that corresponds to a maximum observed value for PHOTO_DET, tighten

the lamp setscrew at the approximate maximum value observed.

If the value of PHOTO_DET is not within the range of 4400 – 4600 mV, adjust it accordingly.

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.

07223B DCN6378