Thermo Scientific 410i Instruction Manual page 148

Preventive Maintenance
Pump Rebuilding
Leaks Across the Optional
Zero/Span and Sample
Solenoid Valves
Pump Rebuilding
Disassembly
5-6 Model 410i Instruction Manual
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
line and follow the "External
If the pressure drops below 250 mmHg, the valve associated with the zero
line is functioning normally.
For new technology pump, use the following procedure to rebuild the
pump (Figure 5–3). The new technology pump will have the repair kit part
number on its label. If no repair kit part number is listed, refer to the
procedure for the older model pump following this procedure. To replace
the pump, see "Pump Replacement" on page 7-23.
Equipment Required:
Flatblade screwdriver
Pump rebuild kit (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 instrument OFF, unplug the power cord, and remove the cover.
Make a sketch of the position of any tubes and fittings for ease of re-
assembly later.
2. Mark the position of the pump top plate, bottom plate and compressor
housing relative to each other by drawing a line on the edges with a
pencil or marker to ensure proper re-assembly.
3. The aluminum compressor housing cover must be removed to gain
access to the inside compressor housing. Remove the four screws and
then remove the cover. Re-use any gasketing. Remove any debris that
may have accumulated in the bottom of the compressor housing.
until zero appears in the status
Leaks" procedure.
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