Reaction Chamber Cleaning Or Removal - Thermo Scientific 42i Instruction Manual

Servicing

Reaction Chamber Cleaning or Removal

Reaction Chamber
Cleaning or Removal
7-20 Model 42i Trace Level Instruction Manual
2. Set the NO BKG and NO
"Calibration Factors Menu" in the "Operation" chapter.
3. Set the NO COEF, NO
4. Set the Averaging Time to 10 seconds. Refer to "Averaging Time" in
the "Operation" chapter.
5. Connect the calibration gas and allow the instrument to sample
calibration gas until the reading stabilizes.
6. From the Main Menu, press
to scroll to PMT Voltage Adjustment > and press
The Set PMT Voltage screen appears.
Note If Service Mode is not displayed, refer to "Accessing the Service
Mode" on page , then return to the beginning of this step.
7. At the Set PMT Voltage screen, use
increment/decrement the counts until the instrument displays the
calibration gas concentration value.
Use the following procedure to clean or remove the reaction chamber (see
Figure 7–10).
Equipment Required:
Allen Wrench, 9/64-inch
Wrench, 7/16-inch
Wrench, 9/16-inch
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.
1. Remove PMT cooler as described in "PMT Cooler and Reaction
Chamber Replacement" in this chapter.
2. Disconnect all plumbing connections from the reaction chamber.
BKG calibration factors to 0.0. Refer to
x
COEF, and NO COEF to 1.000.
x 2
to scroll to Service > press >
.
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to
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