6.4.7 UV Lamp Check
The UV lamp intensity decreases over time, to compensate for this the instrument will increase the
Input pot. When the Input Pot increases above 200 the lamps intensity is not suitable for accurate
measurement and the UV lamp should be replaced.
Equipment Required
• 1.5 mm Hex Key
Procedure
1. Turn OFF the Vacuum source and allow the instrument to return to ambient.
2. Turn the instrument OFF.
3. Open the lid to access the Optical Bench (refer to Section 2.1, Opening the Instrument).
4. Disconnect the UV lamp from the lamp driver PCA (located under the Optical Bench).
5. Loosen the grub screw (1.5 mm hex key) located in the centre of the lamp block (refer to
Figure 137) securing the UV lamp and slowly pull the UV lamp out of the block.
Figure 137 – Location of UV Lamp Securing Grub Screw
6. Install the new UV lamp in reverse order of the above steps. Be sure to insert the UV lamp
completely in the block to achieve maximum signal strength.
CAUTION
Be careful when securing UV lamp with grub screw not to tighten the grub screw
too much and damage lamp. The grub screw has a special rubber tip that
protects the lamp housing but still holds the UV lamp in place.
7. Turn ON the instrument and allow one hour to stabilise.
8. Perform a zero and span calibration (refer to Section 5.4 and Section 5.5).
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