PerkinElmer 200 UV/VIS Series, User Manual

Page: 138 / 177

Maintenance Routine Maintenance
7 - 8
Photodiode and Monochromator Windows
Over time, the photodiode windows in the detector head (which cover and protect the sample
and reference photodiodes) and the monochromator exit windows (which prevent the entry of
dust into the monochromator) may develop an invisible dirt layer which may be highly
absorbent in the low UV. Therefore, these windows should be periodically cleaned with a soft
cotton swab and a solvent such as methanol.
Cleaning the Photodiode Windows
1. Open the Access door.
2. Loosen the knurled nut and swing open the front panel.
3. Swing the detector head to the right to its fully open position.
4. Carefully wipe the photodetector windows with a cotton swab barely moist with metha-
nol.
5. Be sure to allow the windows to dry completely before closing. Close the detector head.
The light gaskets around the photodiodes are
made of a polyethylene foam. Do not permit
any solvent which could be corrosive to come
in contact with the gasket.