74 1100 Series Nano Pump Service Manual
2 Troubleshooting and Test Functions
Ramp 2 The nano pump continues pumping solvent with a flow rate of 150 µl/min.
Channel A delivers for one pump cycle (first, plunger A2 delivers, then plunger
A1), followed by channel B (plunger B2, then plunger B1), both channels with
a stroke of 20 µl. The pressure increase during this phase should be linear.
Large leaks or defects will be characterized by an unstable, non-linear slope.
Ramp 3 Just before the start of the first plateau, plunger A2 delivers with a flow rate
of 50 µl/min for approximately 8 seconds. The system pressure should be 240
bar or higher.
Plateau 1 At plateau 1 plunger A2 delivers with a flow rate of 3 µl/min for 30 seconds.
During this time, the slope should be horizontal or slightly positive (slight
pressure increase). A negative slope indicates a leak rate greater than
3µl/min.
Ramp 4 Plunger B2 delivers 50 µl/min for approximately 8 seconds.
Plateau 2 Plunger B2 delivers with a flow rate of 3 µl/min for 30 seconds. The slope
should be horizontal or slightly positive. A negative slope indicates a leak rate
greater than 3 µl/min.
Ramp 5 Plunger A1 delivers 50 µl/min for approximately 8 seconds.
Plateau 3 Plunger A1 with a flow rate of 3 µl/min for 30 seconds. The slope should be
horizontal or slightly positive. A negative slope indicates a leak rate greater
than 3 µl/min.
Ramp 6 Plunger B1 delivers 50 µl/min for approximately 7 seconds.
Plateau 4 Plunger B1 delivers with a flow rate of 3 µl/min for approximately 30 seconds.
The slope should be horizontal or slightly positive. A negative slope indicates a
leak rate greater than 3 µl/min. At the end of the fourth plateau, the test is
finished and the nano pump switches off.
Running the Leak Test
Tools required Wrench 1/4 inch
Parts and materials
required
Restriction Capillary,G1313-87305
Blank nut, 01080-83202
Isopropanol, 500ml
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