Mass Flow Controller Replacement - Thermo Scientific 146i Instruction Manual

Servicing

Mass Flow Controller Replacement

Mass Flow Controller
Replacement
7-14 Model 146i Instruction Manual
7. Verify that the pressure drops below 180 mm Hg by reading the vacuum
gauge attached to the pump assembly.
8. If the instrument does not meet the previously described conditions,
begin troubleshooting beginning at the top of this procedure.
Use the following procedure to replace a mass flow controller
Equipment required:
Wrenches, 7/16 and 9/16
Philips screwdrivers, #1 and #2
Flatblade screwdriver
New mass flow controller
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. Loosen all four fittings to mass flow controllers.
(Figure 7-4).
Thermo Fisher Scientific