25
GA0383P02 Rev. C
Disconnect the differential pressure gauge and replace the sealing caps on the zone
manifold taps.
Adjusting the Cloud Chamber Airflow
When CHAMBER FLOW ADJ is selected, the GCM-A will stop monitoring particulate levels
and the SYSTEM TROUBLE LED will illuminate. The prompt CONNECT FLOWMETER will
be displayed on the LCD display for reference. Press the FN key to return to the SETUP
MENU.
To check and or adjust the cloud chamber flow disconnect the air sample line from the quick
disconnect fitting on the manifold and insert it into the cloud chamber flow meter (Part #
FA0263G01). Adjust the air flow to 1.1 LPM by adjusting the Chamber Flow Adjust screw (1/
16 allen screw) located on the Chamber/Humidifier assembly on the bottom front side of the
cloud chamber. Remove the air flow meter and reconnect the air sample line to the Inlet
Manifold fitting. Press the FN key to return to normal functioning.
Setting the Ambient Gain
The ambient gain determines the sensitivity of the submicron particle detector. The higher
the ambient gain setting, the more sensitive the detector. The factory default value for the
ambient gain is 1. The ambient gain can be changed by selecting AMBIENT GAIN from the
SETUP MENU.
When AMBIENT GAIN is selected, the ambient gain will be displayed on the LCD display.
Press the UP ARROW key to increase it. Press the DOWN ARROW key to decrease it. It
cannot be decreased below 1 or increased beyond 9.9. Press the ENTER key to save your
changes and return to the SETUP MENU. Press the FN key to discard the changes and
return to the SETUP MENU.
Setting the Ambient Warning Level
The ambient warning level determines what electrical output from the cloud chamber
detector will trigger a WARNING indication The ambient warning level is expressed as a
percentage of full scale. A WARNING indication is given when the output of the cloud
chamber detector exceeds the value of ambient warning level. The factory default value for
the ambient warning level is 50 percent. The ambient warning level can be changed by
selecting AMBIENT WARNING from the SETUP MENU.
When AMBIENT WARNING is selected, the ambient warning level will be displayed on the
LCD display. Press the UP ARROW key to increase it. Press the DOWN ARROW key to
decrease it. It cannot be decreased below one or increased beyond the ambient alarm level.
Press the ENTER key to save your changes and return to the SETUP MENU. Press the FN
key to discard the changes and return to the SETUP MENU.
Setting the Ambient Alarm Level
The ambient alarm level determines what electrical output from the cloud chamber detector
will trigger an ALARM indication. The ambient alarm level is expressed as a percentage of full
scale. An ALARM indication is given when the output of the cloud chamber detector exceeds
the value of ambient alarm level. The factory default value for the ambient alarm level is 80
percent. The ambient alarm level can be changed by selecting AMBIENT ALARM from the
SETUP MENU.
(Adjusting the Generator Airflow, cont’d)
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