22 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
Pressure Test
The pressure test is a quick, built-in test designed to demonstrate the
pressure-tightness of the system. The test should be used when problems with
leaks are suspected, or after maintenance of flow-path components (e.g.,
pump seals, injection seal) to prove pressure tightness up to 400 bar. The test
involves monitoring the pressure profile as the nano pump runs through a
predefined pumping sequence. The resulting pressure profile provides
information about the pressure tightness of the system. ( "Normal Mode
Pressure Test" on page 68).
Leak Test
The leak test is a diagnostic test designed to determine the pressure tightness
of the nano pump. Especially when a problem with the pistons the AIV or the
OBV is suspected, use this test to help troubleshoot the nano pump and its
pumping performance ("Leak Test" on page 73).
EMPV Test
The test is designed to verify the performance of the EMPV. The test must
always be done when the EMPV valve is exchanged. The test should also be
done if column flow stability problems occurs in micro mode (see)
The EMPV test is not a substitute for the leak test or pressure test. The leak
and pressure tests should also be done when leaks within the pump heads
might be the problem ("EMPV Test" on page 84)
Flow Sensor Accuracy Calibration
The flow sensor accuracy calibration test is designed to calibrate the flow
accuracy and to compensate the electronic offset of the nano flow sensor. This
test should be done if high flow accuracy is needed at flow rates lower than
500 nl/min.
The calibration of the flow sensor is based in the linear relationship between
the flow rate and pressure drop in a capillary. The zero point is corrected and
calibration factors are evaluated ("Flow Sensor Accuracy Calibration" on
page 86)
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