User manual

112 1260 Nanoflow Pump User Manual

8 Test Functions and Calibration

Normal Mode Pressure Test

Description

The System Pressure Test is a quick, built-in test designed to demonstrate the

pressure-tightness of the system. The test is required, if problems with small

leaks are suspected, or after maintenance of flow-path components (e.g.,

pump seals, injection seal) to prove pressure tightness up to 400 bar.

For running the test, please refer to the online help of the diagnostic software.

Preparation

The EMPV is not designed for pressure tightness towards the waste port.

Install the manual purge valve from the accessories kit to pump head A. Move

the inline filter outlet capillary from the EMPV to the manual purge valve.

Step 1

The test begins with the initialization of both pumpheads. After initialization,

pistons A1 and B1 are both at the top of their stroke. Next, pump A begins

pumping solvent with a flow rate of 510 µL/min and stroke of 100 µL. The

pump continues to pump until a system pressure of 390 bar is reached.

Step 2

When the system pressure reaches 390 bar, the pump switches off. The

pressure drop from this point onwards should be no more than 2 bar/min.

NOTE

For this test only channel A2 is active. To test the pressure tightness of the pump use the

leak test, see “Leak Test Description” on page 116.