Cleaning The Lithium Fluoride Window; Replacing The Sample Inlet Filter - PerkinElmer Photovac 2020 Manual

Portable photoionization detector

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2020 Software Manual

Cleaning the Lithium Fluoride Window

To clean the 11.7 eV lamp window:

NOTE: You may not be able to fully clean the 11.7 eV lamp window.

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.

120

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.

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