YL9120 UV/Vis Detector
Chapter 4. Maintenance
4-1. D2 lamp
The Deuterium Lamp (D
2
) is covered from 190 to 600 nm of wavelength. The replacement time is either in
case you use the lamp more than 2000 hours or in case the light intensity is a half (50%) of the original
intensity when you installed the lamp at first. An using time of D2 lamp is counted in the system indicating
the total hours of operation after lamp on.
Check the lamp intensity as follows:
1) Power on the unit if it is not already on. Wait for a period of approximately 10 minutes.
2) Set the wavelength to 254 nm by YL-Clarity software
3) Select the Reference Light Intensity.
4) If the displayed value is less than a half of the original intensity, the lamp should be replaced to
new one. Generally, you have to consider the lamp exchange when the light intensity of reference
energy is less than 50 nA.
4-1-1. How to remove the D
2
lamp
1) Make sure that the power cord is disconnected from the rear panel of the detector.
2) Unscrew the screws and remove the lamp assembly on the right front panel.
3) CAUTION ; UV light can damage eyes and skin. Always disconnect the power cord before
working in the vicinity of the lamp. The D
2
lamp gets quite hot. Care must be taken while handling
it to prevent from burning. Always allow the lamp to cool before removing it.
4) Disconnect the UV lamp from the detector by gently pulling it straight back toward you. DO NOT
twist the connector while pulling.
5) Unscrew the two thumbscrews holding the lamp mount in place, and pull the lamp mount straight
back
6) towards you. Be careful not to lose the two thumbscrews. Be careful not to get fingerprints on the
lamp.
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