Agilent Technologies 1100 Series, Service Manual

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1100 Series Nano Pump Service Manual 77
Troubleshooting and Test Functions 2
Evaluating the Results of the Leak Test
Defective or leaky components in the pump head lead to changes in the
leak-test pressure plot. Typical failure modes are described below.
Figure 10 Leak Test Pressure Plot
Plateau 1 Plateau 2
Plateau 3
Plateau 4
Time [minutes]
Pressure
[bar]
N O T E
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.
N O T E
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!
N O T E
The pressure plots shown below are examples only. The plots may vary depending on the
type and degree of leakage.