1100 Series Nano Pump Service Manual 71
Troubleshooting and Test Functions 2
Once the test is started, the nano pump increase the pressure up to
approximately 390 bar. Afterwards the flow stops and the pressure drop is
monitored and displayed on the control module. The control module
displays a graphical representation of the pressure. “Evaluating the
Results” on page 71 describes the evaluation and interpretation of the
pressure test results.
7 When the test is finished slowly unscrew the blank nut.
Evaluating the Results
The sum of all leaks between the pump and the blank nut will be indicated by a
pressure drop of >2 bar/minute at the plateau. Note that small leaks may cause
the test to fail, but solvent may not be seen leaking from a module.
If the pressure test fails:
• Ensure all fittings between the pump and the blank nut are tight. Repeat the
pressure test.
• If the test fails again, insert the blank nut at the outlet of the previous
module in the stack and repeat the pressure test. Exclude each module one
by one to determine which module is leaking.
• If the pump is determined to be the source of the leak, run the EMPV
cleaning procedure, repeat the pressure test and if the test fails again, run
the leak test.
NOTE
Please notice the difference between an error in the test and a failure of the test! An error
means that during the operation of the test there was an abnormal termination. If a test
failed, this means that the results of the test where not within the specified limits.
NOTE
Often it is only a damaged blank nut itself (poorly shaped from overtightening) that causes
a failure of the test. Before investigating on any other possible sources of failure make sure
that the blank nut you are using is in good condition and properly tightened!
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