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Preventive Maintenance
Pump Rebuilding
Thermo Fisher Scientific
Model 15
i
Instruction Manual
5-5
In order to check for leaks across the optional valves, plug the SPAN inlet
line, press
until span appears in the status line and follow the
“
External Leaks
” procedure.
If the pressure drops below 250 mmHg the valve associated with the span
line is functioning normally. Repeat for the valve associated with the zero
line by plugging the zero inlet, press
until zero appears in the status
line and follow the “
External Leaks
” procedure.
If the pressure drops below 250 mmHg, the valve associated with the zero
line is functioning normally.
Use the following procedure to rebuild the pump (
Figure 5–2
). To replace
the pump, see “
Pump Replacement
” on page
7-20
.
Equipment Required:
Flatblade screwdriver
Flapper valve and diaphragm
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 the instrument OFF, unplug the power cord, and remove the
cover.
2.
Loosen the fittings and remove both lines going to the pump.
3.
Remove the four screws from the top plate, remove top plate, flapper
valve, and the bottom plate.
Leaks Across the Optional
Zero/Span and Sample
Solenoid Valves
Pump Rebuilding