Figure 5-1. Inspecting And Cleaning The Fan; Leak Test And Pump Check Out - Thermo Scientific 48i Instruction Manual

Preventive Maintenance

Leak Test and Pump Check Out

Leak Test and
Pump Check Out
External Leaks
5-4 Model 48i Instruction Manual
Figure 5–1. Inspecting and Cleaning the Fan
There are two major types of leaks: external leaks and leaks across the
optional zero/span solenoid valve seals.
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
display the Diagnostics menu.
4. Press to move the cursor to Flow and press
Sample Flow screen. The flow reading should indicate zero flow and
the pressure reading should be less than 250 mmHg. 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 mmHg is obtained.
Mounting Screws (4)
Filter
Fan Guard
Thermo Fisher Scientific
to
to display the