82 Model 5380 PFPD Operator’s Manual
Rev. 3.1
11. Using a clean tissue, push the light pipe into the light pipe housing until it is
flush with the edge of the PMT mounting. If the light pipe does not slide in
easily, loosen the light pipe clamp and try again. Tighten the light pipe clamp
an additional Q/r–Q/w turn. Ensure that the light pipe does not extend more than
1.5 mm beyond the edge of the light pipe mount. Greater protrusion could
result in damage to the light pipe, filter(s), and/or PMT.
12. Verify that the PMT Viton O-ring, which causes the PMT housing assembly
to fit snugly onto the PMT mounting, is in place and not damaged. Replace if
necessary. Twist the PMT housing assembly back and forth onto the PMT
mounting and attach it using the thumbscrew.
13. Route the PMT cables to avoid high thermal zones, sharp edges, or places
where they could be pinched or sheared.
14. Connect the PMT signal cable and the PMT HV cable to their respective
connectors at the back of the Detector Controller.
15. Using WinPulse, reset the PMT voltage to its appropriate voltage (e.g.,
nominally 600 V).
16. Optimize the PMT voltage. See step 12 in “Starting the PFPD System” in
Chapter 5.
Cleaning the Model 5380 PFPD
The following procedures can be used for cleaning the various components, tools,
and optics of the Model 5380 PFPD.
Cleaning Optical Components
Optical components consist of the light pipe, optical filter, and the PMT window
(face of the PMT).
1. Dampen a clean, lint-free lab tissue or optical tissue with methanol (or
isopropanol) and lightly wipe the surfaces to remove fingerprints or other
sources of contamination.
2. Handle the components with white latex gloves, optical tissues, or clean, lint-
free lab tissues. Store in their protective containers.
Cleaning Combustors
In most cases, the combustor cannot be cleaned back to original performance
levels. If the combustors are not performing properly, they should normally be
replaced. Store combustors in their protective containers.
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