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Thermo Scientific
Figure 7–43. PMT Tube Replace-Screws
6. Using a #2 Phillips drive, unfasten three 8-32 pan head screws.
Equipment Damage Do not point the photomultiplier tube at a light
source. This can permanently damage the tube.
7. Pull the PMT and PMT base from cooler assembly by twisting it
slightly back and forth.
8. To install PMT, follow previous steps in reverse order making sure to
backfill the cooler with dry air or nitrogen prior to replacing the PMT.
9. Perform a PMT calibration as described on page 3-86.
DMC PMT Cooler and Reaction Chamber Replacement
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42iQ Instruction Manual
Servicing
7-39
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