94 Agilent 1200 Preparative Pump User Manual
6 Troubleshooting and Diagnostics
Pressure Test
Pressure Test
Prep Pump Pressure Test Description
The pressure test is a quick, built-in test designed to demonstrate the
pressure-tightness of the system. The test involves monitoring the flow rate,
required to keep a constant pressure of 350 bar, as the preparative pump runs
through a predefined pumping sequence. The resulting flow rate provides
information about the pressure tightness of the system.
Step 1
The test begins with an automated flushing of the pump at a flow rate of
25 ml/min with an open EMPV.
Step 2
The EMPV is closed and next, piston A begins pumping solvent with a flow
rate of 0.5 ml/min until reaching a pressure of 150 bar. At this point, the pump
delivers at a flow rate of 0.2 ml/min until reaching a pressure of 250 bar. The
pump then delivers at a flow rate of 0.1 ml/min until reaching a pressure of
345 bar, then switches into its “Keep pressure mode”.
Step 3
When the system pressure reaches 350 bar, the preparative pump switches to
its “Keep-pressure-mode”. The flow rate to compensate for leaks should from
this point onwards be no more than 10 µl/minute.
To test the pressure tightness of all individual components in the flow path of the pump
itself use the leak test, see “Prep Pump Leak Test Description” on page 98.
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