PerkinElmer Photovac 2020, Manual

Page: 122 / 190

2020 Software Manual
120
Cleaning the Lithium Fluoride Window
To clean the 11.7 eV lamp window:
1. Clean the lamp window with dry aluminum oxide
powder on a dry cotton swab. Do not use methanol or
water.
2. Wipe the window and the lamp with a dry, lint free
tissue to remove any trace amounts of the cleaning
compound and methanol. All traces of cleaning
compound must be removed.
3. The lamp window can also be regenerated by storing
the lamp in a desiccator for at least 5 days.
NOTE: You may not be able to fully clean the 11.7 eV lamp window.
Replacing the Sample Inlet Filter
2020 is equipped with a combined dust and water filter to reduce
detector contamination. As the filter collects dust, 2020’s inlet flow
rate and sensitivity decrease. The filter will not allow water to pass
through, but the filter will not stop all solvents.
NOTE: Do not aspirate liquid samples with 2020!
Replace the filter on a weekly basis, or more frequently if 2020 is
used in a dusty or wet environment. You must replace the filter if
2020 has been exposed to liquid water. If you are sampling hot
gases or vapors, condensation in the sample line may also affect the
filter. The pump will sound labored when the filter requires
replacement.