Servicing
Reaction Chamber Cleaning or Removal
Thermo Electron Corporation Model 42i Low Source Instruction Manual 7-19
a. At the Main Menu, press to scroll to Instrument Controls >
press > to scroll to Service Mode > and press .
The Service Mode screen appears.
b. Press to toggle the Service Mode to ON.
c. Press > to return to the Main Menu.
d. Continue the procedure at the beginning of Step 6 to display the Set
PMT Voltage screen.
7. At the Set PMT Voltage screen, use to
increment/decrement the counts until the instrument displays the
calibration gas concentration value.
Reaction Chamber
Cleaning or Removal
Use the following procedure to clean and/or remove the reaction chamber
(see Figure 7-11).
Equipment Required:
Allen Wrench, 9/64-inch
Wrench, 7/16-inch
Wrench, 9/16-inch
1. Remove PMT cooler as described in “PMT Cooler and Reaction
Chamber Replacement” in this chapter.
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly grounded antistatic wrist strap must
be worn while handling any internal component.
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