84 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
EMPV Test
Description
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 (micro mode only).
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.
Step 1 The test starts with a short flushing sequence and a cleaning procedure for the
EMPV.
Step 2 Afterwards, low and high pressure is controlled by the EMPV and the
appropriate current is monitored.
Step 3 Finally, a linear pressure ramp is performed.
Running the test
1 Select the ChemStation’s Diagnosis screen; from the nano pump tests
selection box, select “Micro Mode Pressure Test”.
2 Start the test and follow the online instructions
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