Waters 2489, Operator'S Manual

Page: 152 / 234

4-18 Maintaining the Detector
Replace the lamp on your detector when
• it fails to ignite at startup.
• the energy level in the lamp causes a decrease in sensitivity to the point
where the baseline is too noisy for your LC application.
Rule:
Always run the procedure in “Recording sample and reference beam
energies” on page 3-28 when you change the detector lamp.
Performance requirements and permitted tolerances vary from application to
application. If the lamp no longer provides an adequate signal-to-noise ratio
for your specific application, replace it.
The 2489 UV/Visible Detector source lamp is warranted to light and pass
startup diagnostic tests for 2000 hours or one year from the date of purchase,
whichever comes first.
Removing the lamp
To remove the lamp:
1. Extinguish the lamp using the keypad by pressing <Shift> <Lamp> and
then pressing <Shift> <Lamp> again.
Tip:
Using the keypad to extinguish the lamp allows the lamp to cool
faster, because the instrument fan blows cool air on the hot lamp. To
power-off the lamp using a timed event, see the instructions in the
Empower or MassLynx help.
2. Power-off the detector and disconnect the power cord.
Warning: The lamp housing gets extremely hot during operation. To
prevent burn injuries,
• allow the lamp to cool for 30 minutes before removing it.
• keep the lamp in the housing when handling the lamp.
Warning:
To avoid eye injury from ultraviolet radiation exposure,
• power-off the detector before changing the lamp.
• wear eye protection that filters ultraviolet light.
• keep the lamp in the housing during operation.