3. Preparation
3-10
CBM-20A/20Alite
The "Isocratic pump" refers to a pump used in the LC-30A/LC-20A series except LC-
20AB.
The pumping-mode selection is reflected in the [Operation Mode] column of the configuration
table in the following way.
Pump allocation:
• Allocate isocratic pumps to the gray boxes in the table. Do not allocate different pump
models.
• If isocratic pumps are allocated to the white boxes in the table, operation will be in
ISO mode, and if binary pumps are allocated to these boxes, operation will be in
B.GE mode.
The LC-20AB can only used as a binary pump. It cannot be used in place of an
isocratic pump. More specifically, correct operation is not possible in the following
cases.
• The LC-20AB is connected as pumps A and B in B.GE mode.
• The LC-20AB is connected as pumps A, B, and C in T.GE mode.
• The LC-20AB is connected as pump A in LP.GE mode.
• The LC-20AB is connected as pumps A, B, C, and D in B.GEx2 mode.
Even if a pump which is not compatible with a low-pressure gradient (such as the LC-
10AS) is connected in LP.GE mode, it will not operate properly.
T.GE
Select this mode to use the ternary gradient mode in combination with 3
isocratic pumps connected to Pump A, B, and C. This enables the high-
pressure gradient pumping of 3 solvents.
LP.GE
Select this mode to use the low-pressure gradient mode with an
isocratic pump connected to Pump A. This enables the low-pressure
gradient pumping of 4 solutions.
B.GEx2
Select this mode to use binary gradient with 2 flow lines and a
combination of 2 isocratic pumps for each flow line. In this case, 4
pumps are required.
Pump
Pumping mode
ISO/Binary
Pump
B.GE T.GE LP.GE B.GEx2
Pump A ISO1/B.GE1
B.GE1 T.GE1 LP.GE B.GE1
Pump B ISO2/B.GE2
B.GE1 T.GE1 ISO2/B.GE2 B.GE1
Pump C ISO3/B.GE3 ISO3/B.GE3
T.GE1 ISO3/B.GE3 B.GE3
Pump D ISO4/B.GE4 ISO4/B.GE4 ISO4/B.GE4 ISO4/B.GE4
B.GE3
Pumping mode Description
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