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1. Turn the electrometer off.
2. Turn hydrogen, air, and auxiliary gas supplies
to the detector off. Turn the heaters off.
Wait for the detector to cool.
Caution
Always turn the electrometer off before
removing the PMT housing to avoid destroy-
ing the tube.
3. Release the retaining spring around the pho-
tomultiplier housing.
Released: April 2004
4. Pull the PMT housing off the detector
Figure 1-17. Removing the PMT filter
6850 Series Gas Chromatograph Service Procedures
module and remove the filter from the detec-
tor. Use lint-free lens tissue to clean the
filter on both sides. Also clean the window in
the PMT tube. Be careful to not scratch the
surfaces; do not use a cleaning fluid that
might leave a film upon drying. Keep the
open end of the PMT covered whenever prac-
tical to avoid light damage to the tube.
Loosen screw
Filter
Loosen screws
177
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