INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 78)

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Also, unlike other UV lamp windows, LiF readily absorbs water from atmospheric
humidity. When contaminated by moisture, the window loses its ability to transmit
UV light.
NOTE: Do not touch the lamp window or handle it near water.
Using the 11.7 eV UV Lamp
With an 11.7 eV lamp installed, your instrument functions as a detector responding
to compounds which ionize at 11.7 eV or less. The 11.7 eV lamp may be useful for
detecting compounds not ionized by the standard 10.6 eV lamp.
Due to the lamp window limitations, the lifetime of the 11.7 eV lamp is restricted and
it must be used sparingly according to the following instructions.
To use the 11.7 eV lamp in your the 2020ppbPRO:
1. Remove the 11.7 eV lamp from the supplied desiccant bottle and install
the lamp as outlined in Removing and Replacing the UV Lamp on page 7.
NOTE: Do not remove or replace any detector lamp in a hazardous location.
2. Turn the instrument on and wait for the ready status. If the lamp cannot
be started, contact INFICON
’s Technical Support Department.
3. Calibrate the 2020ppbPRO. See Calibration Using the Flow-Match
Regulator on page 61.
4. All response factors are invalid when an 11.7 eV lamp is installed. The
response factor must be set to 1.
5. Every hour of operation, switch off the instrument, remove the lamp and
examine the window for yellowing. If the window is yellow, then
regenerate the window according to the procedure in
6. Cleaning the Lithium Fluoride Window on page 80.
7. After use, remove the lamp and store it in the supplied desiccant bottle.
Do not leave the 11.7 eV lamp in the instrument when you turn it off. Always remove
the 11.7 eV lamp and store it in the supplied desiccant bottle.