UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Page
174
Operating Instructions
6.7 Checking the Compression Values (Loading Pump)
Relevant only for the loading pump
Tip:
The following applies only when the loading pump has backpressure.
The compression value of the pump head can provide valuable information for
troubleshooting. If you observe pump pulsation and/or shifts in retention times, check the
compression values:
•
On the pump display, select the
Diagnostics
menu and
Compression
.
•
In Chromeleon, open the
Commands
dialog box for the loading pump and select
LoadingPump_Wellness_RightBlock
and
Compression
.
The values are indicated in percent; they show the compression of the last stroke. The
compression value should be lower than 100% and remain stable. If the value is close to
100%, the required precompression may not be reached and pulsation may occur.
The table shows guides values for some solvents:
Solvent
Compression*
Acetonitrile
70 %
±
10 %
Methanol
75 %
±
10 %
Water
50 %
±
10 %
* with 100 % of degassed solvent delivered at 40 MPa, pump purged and stable for some time The values
are linear to the pressure.
•
If the compression value is lower than indicated in the table, the valve cartridge (outlet
check valve) may be defective. Replace the cartridge (
→
page 182).
•
If the compression value is
higher
than indicated in the table
♦
The piston seals may be defective. Replace the piston seals (
→
page 194).
♦
The valve cartridge (inlet check valve) may be defective. Replace the cartridge
(
→
page 182).
•
If the compression is very high and the pressure is low, there may be air bubbles in the
system. Purge the loading pump (
→
page 76).
Summary of Contents for Dionex UltiMate 3000 Series
Page 2: ...UltiMate 3000 Series NCS 3500RS and NCP 3200RS Operating Instructions ...
Page 8: ...UltiMate 3000 Series NCS 3500RS and NCP 3200RS Page vi Operating Instructions ...
Page 24: ...UltiMate 3000 Series NCS 3500RS and NCP 3200RS Page 16 Operating Instructions ...
Page 62: ...UltiMate 3000 Series NCS 3500RS and NCP 3200RS Page 54 Operating Instructions ...
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