Agilent 1200 Preparative Pump User Manual 97
Troubleshooting and Diagnostics
6
Pressure Test
Evaluating the Results
The sum of all leaks between the pump and the blank nut will be indicated by
flow rate of > 10 µl/minute to keep the pressure constant. Note that small
leaks may cause the test to fail, but solvent may not be seen leaking from a
module.
Large internal leaks at the EMPV can easily be identified by observing a flow
out through the waste tubing of the EMPV, while the EMPV should be closed.
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.
Do not overtighten fittings! After the first major increase of resistance when tightening a
previously loose fitting, the fitting should not be tightened any further than an additional
1/8 to 1/4 wrench turn.
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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