Servicing
Solenoid Valve Replacement
Thermo Electron Corporation Model 42i Low Source Instruction Manual 7-23
7. Remove the converter cartridge/heater assembly from the bottom
housing assembly.
8. Loosen the heater clamp, pry heater apart no wider than necessary and
remove the converter cartridge noting the proper orientation of heater
wires and thermocouple probe.
9. To replace converter, follow previous steps in reverse. Note Be sure to
wrap the O
3
converter tube snugly around the heater.
Solenoid Valve
Replacement
Use the following procedure to replace the solenoid valve (Figure 7-13).
Equipment Required:
Solenoid valve
Wrench, 5/16-inch
Philips screwdriver
1. Refer to “Removing the Measurement Bench and Lowering the
Partition Panel” in this chapter to lower the partition panel, then
proceed to the next step below.
2. Disconnect solenoid from the Measurement Interface board (NO/NO
X
connector). Note electrical connections to facilitate re-connection.
3. Remove plumbing from solenoid. Note plumbing connections to
facilitate re-connection.
4. Pull solenoid valve from mounting clip.
5. To replace solenoid, follow above in reverse.
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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