INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 86)

80 ISP-074-576-P1D 80
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.
NOTE: You may not be able to fully clean the 11.7 eV lamp window. The solarizaton effect
cannot be cleaned and will require replacement of the lamp (anticipated life is 1 - 3
months depending on amount of use).
Replacing the Sample Inlet Filter
The 2020ppbPRO is equipped with a combined dust and water filter to reduce
detector contamination. As the filter collects dust, the 2020ppbPRO
’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 the 2020ppbPRO!
Replace the filter on a weekly basis, or more frequently if the 2020ppbPRO is used
in a dusty or wet environment. You must replace the filter if the 2020ppbPRO has
been exposed to water. If you are sampling hot gases or vapors, condensation in
the sample line may also affect the filter.
WARNING
Do not replace the inlet filter in a hazardous location.
To replace the inlet filter:
1. Turn the instrument off. Unscrew the filter housing from the detector
housing. Be careful not to lose the O-ring seal.
2. Remove the Teflon/Polypropylene filter and install the new filter (Part
No. MX750100). Place the filter so that the Teflon side is facing down in
the filter housing and the mesh side is facing the 2020ppbPRO.