Download Model 42i - User Manual

Servicing
NO2-to-NO Converter Replacement
CAUTION Avoid contact with converter heated components. Allow
converter to cool to room temperature before handling converter
components. ▲
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. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Allow converter to cool to room temperature to prevent contact with
heated components.
3. Disconnect plumbing at converter inlet and outlet.
4. Disconnect thermocouple leads and heater connector from temperature
control board.
5. Loosen the four captive screws holding converter housing to floor plate.
Top Housing Assembly
Moly Converter Assembly
Heater Assembly
Thermocouple Leads
and Heater Connector
O3 Converter
Bottom Housing Assembly
Captive Screws (4)
Figure 7–10. NO2-to-NO Molybdenum Converter Assembly
Thermo Fisher Scientific
Model 42i Instruction Manual
7-19