GE Analytical Instruments ©2006 15-10 DLM 14291 Rev. A
Vacuum Test
After the reaction cell has been cleaned, repeat the vacuum test described in
Chapter 4 (page 4-9), to make sure the o-rings are properly positioned in the
reaction cell. With the sample inlet and ozone gas supply inlet capped off, the cell
pressure should drop to <1 torr. If the pressure is above 1 torr, there may be a
leak due to the o-ring being out of its groove. Follow the procedures described
above to remove the PMT, disconnect the cooler from the reaction cell and slide
the cooler away from the cell. Check the position of the o-rings, reconnect the
cooler and replace the PMT. Repeat the vacuum test after reconnecting the
reaction cell.
Reset the Cell Cleaning Timer
To reset the timers for the Reaction Cell, the NOA must be in the Stop or Stand-by
mode. From the Main Menu, use the Arrow Buttons to scroll to Maintenance and
press ENTER. The Maintenance Menu is displayed. Use the Arrow Buttons to scroll
to Consumables and press ENTER. The display will change giving the option to view
or install the consumables. Select Install and press ENTER to display the
Consumables Menu. Select the Cell option and press ENTER to display the Reaction
Cell Menu. Press ENTER to display a confirmation screen. Select Install and press
ENTER to reset the Reaction Cell Timer. The Reaction Cell Menu will be displayed
with the remaining time reset to 900 hours.
Light Leak Test
After the temperature of the cooler has stabilized at –12 °C, check that the o-rings
are properly positioned by checking if ambient light is getting into the reaction
cell. To perform the light leak test:
• Turn on the oxygen supply to the NOA.
• From the Main Menu, press CLEAR to display the Status screen.
• Confirm that the Cooler Temperature is at –12 °C and the supply pressure is 6
psi.
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