Agilent Technologies G6600-90006 User Manual
Page 87

Operation and Maintenance Manual
87
8
Clean any deposits on the optical filter using a soft cloth or Kimwipe
dampened with methanol or deionized (DI) water. Do not leave fingerprints
or fibers on the cleaned filter. Deposits inside the reaction cell can be
cleaned in the same manner, however, care must be taken to avoid bending
the ozone inlet tube that extends into the cell.
9
Reseat the pass filter into the PMT housing. Confirm that the two o-rings
around the reaction cell are properly seated in the O-ring grooves (see
). Carefully re-align the reaction cell to the PMT housing, making
sure the o-rings remain properly seated, and secure the cell to the housing
with the three screws. (The two o-rings must be correctly seated in order to
obtain a vacuum-tight and light-tight seal.)
10
To re-install the PMT, minimize all light sources. Remove the PMT cap,
being careful not to touch the PMT window. Insert the PMT and the socket
assembly into the PMT housing and screw in the socket assembly until it is
seated tightly against the housing. The room lights may now be turned on.
11
Reconnect the PMT high voltage cable to the MHV connector (longer
connector) and the PMT signal cable to the BNC connector (shorter
connector) at the back of the socket assembly (see
12
While the side panel is still removed, reconnect the AC power cord to the
Detector and switch the front panel power to ON. To ensure that the o-rings
have been properly sealed, monitor the Detector baseline at "attenuation 1"
for several minutes (with the room light ON), and after noting the baseline
signal, turn the room lights OFF. If the baseline signal significantly
decreases, the o-rings are incorrectly positioned and the PMT must be
removed and the cell re-installed.
13
If no change in the baseline is observed, check the system for vacuum leaks
by turning on the vacuum pump and monitoring the pressure as described
in Section 7. If the pressure readings are comparable to start-up values, the
o-rings are properly positioned. If a significantly higher pressure is
observed, the PMT must be removed and the cell re-installed.
WA R N I N G
The high voltage and signal cables must be attached to the proper connectors on the pmt
socket; damage to the pmt will occur if the cables are not properly connected.