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6. Replace the front cover.
7. Flush the flow cell (refer to
3.2 Replacing the Lamp
Replace the lamp in the 996 detector when either of the following conditions exists:
• Intensity is low enough that sensitivity is not sufficient for your method.
• The sampling rate requires an exposure time shorter than the minimum exposure
time you can set with the current lamp.
Before you replace the detector lamp, check the lamp usage indicator located to the front
of the lamp retainer, as described in
3.2.1 Checking Lamp Usage
The Waters 996 detector lamp is designed to provide adequate energy for more than 1000
hours of operation. You can monitor lamp usage by checking the lamp usage indicator, a
mercury column with a scale of 0 to 10, where 10 represents 1000 hours. As the lamp
ages, the bubble in the mercury column moves toward the 10.
Caution:
To avoid electrical hazards and exposure to UV light, turn off the power and
disconnect the power cord before you begin this procedure. Note that the lamp and
housing are extremely hot. To avoid the possibility of contacting hot surfaces, allow the
lamp to cool for 15 minutes before you handle the lamp assembly or surfaces close to the
lamp.
Procedure
To inspect the lamp usage indicator:
1. Power off the 996 detector, remove the power cord, and allow the lamp to cool for at
least 15 minutes.
2. Lift up the front panel cover and pull it away from the chassis.
3. Open the lamp access door by pulling the thumbtab, then pulling the door toward
you
(Figure
Section 3.1.1, Flushing the Flow
Section 3.2.1, Checking Lamp
3-5).
Cell).
Usage.
Replacing the Lamp
39
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