Sample/Reference Solenoid Replacement - Thermo Scientific 49i Instruction Manual

Servicing

Sample/Reference Solenoid Replacement

Sample/Reference
Solenoid
Replacement
7-32 Model 49i Instruction Manual
7. Calibrate the instrument. Refer to the "Calibration" chapter in this
manual.
Use the following procedure to replace a sample/reference solenoid valve.
Equipment required:
Solenoid
Flatblade screwdriver
Open-end wrench, 5/8-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. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Disconnect the Sample and Ref connection cables from the
measurement interface board.
3. Remove the plumbing from the solenoids.
4. Loosen the four captive screws and lift out the solenoids and the
solenoid plate.
5. Remove the solenoid retaining nuts from the underside of the faulty
solenoid and remove the solenoid.
6. Replace the new solenoid by following the previous steps in reverse
making sure that all connections are tight.
7. Perform a leak test. Refer to the "Solenoid Leaks" procedure in the
"Preventive Maintenance" chapter.
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