Leak Test; Prep Pump Leak Test Description - Agilent Technologies 1200 Series User Manual

6
Troubleshooting and Diagnostics

Leak Test

Leak Test

Prep Pump Leak Test Description

The leak test is a quick, built-in test designed to demonstrate the
pressure-tightness of the pump. The test involves monitoring the pump drive
steps needed to build up a pressure of 350 bar and 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 pump. Each step is separately performed
and evaluated separately for piston 1 and piston 2.
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 1 begins pumping solvent with a flow rate
of 2 ml/min until reaching a pressure of 150 bar, then the pump delivers at a
flow rate of 0.2 ml/min until reaching a pressure of 250 bar, then the pump
delivers at a flow rate of 0.1 ml/min until reaching a pressure of 345 bar, then
the pump switches into its "Keep pressure mode".
Step 3
The flow rate to compensate for leaks should from this point onwards be no
more than 10 µl/minute.
Step 4
Steps 2 and 3 are automatically repeated for piston 2.
98 Agilent 1200 Preparative Pump User Manual