Preventive Maintenance
Leak Test and Pump Check Out
5-4 Model 48i Instruction Manual Thermo Electron Corporation
Leak Test and Pump
Check Out
There are two major types of leaks: external leaks and leaks across the
optional zero/span solenoid valve seals.
External Leaks Use the following procedure to test for external leaks.
1. Disconnect the sample input line and plug the SAMPLE fitting.
2. Press to display the Main Menu.
3. Press to move the cursor to Diagnostics and press to
display the Diagnostics menu.
4. Press to move the cursor to Flow and press to display the
Sample Flow screen. The flow reading should indicate zero flow and the
pressure reading should be less than 250 mm Hg. If not, check to see
that all fittings are tight and that none of the input lines are cracked or
broken. For detailed information about this screen, refer to the
“Operation” chapter.
If the pump diaphragm is in good condition and the capillary not blocked,
it should take less than one minute from the time the inlet is plugged to the
time the reading below 250 mm Hg is obtained.
Leaks Across the Optional
Zero/Span and Sample
Solenoid Valves
In order to check for leaks across the optional valves, plug the SPAN inlet
line, press and follow the “External Leaks” procedure.
If the pressure drops below 250 mm Hg 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 and follow the “External Leaks”
procedure.
If the pressure drops below 250 mm Hg, the valve associated with the zero
line is functioning normally.
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