Servicing
NO2-to-NO Converter Replacement
7-22 Model 42i Low Source Instruction Manual Thermo Electron Corporation
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.
Figure 7-12. NO
2
-to-NO Moly Converter Assembly
6. Remove the six screws holding the top housing assembly to the bottom
half.
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.
Moly Converter
O
3
Converter
Bottom Housing
Top Housing Assembly
Heater Assembly
Captive Screws (4)
Thermocouple Leads
and Heater Connector
Assembly
Assembly
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