Agilent Technologies G6600-90006 manual Wa R N I N G

8Clean 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.

9Reseat 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 Figure 24). 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.)

10To 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.

11Reconnect 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 Figure 23).

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.

12While 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.

13If 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.

Operation and Maintenance Manual 87