UltiMate 3000 Series:
SD, RS, and BM Pumps
Operating Instructions
Page
181
8.5.3 Possible Gradient Combinations and Operating Principle (Schematics)
The HPG-3400 includes a "2 from 4" solvent selector. Channels A and C are connected to
the left pump head, while channels B and D are connected to right pump head. Thus, the
solvent selector supports the following combinations of binary high-pressure gradients:
Left pump head
Right pump head
Solvent A
Solvent B
Solvent A
Solvent D
Solvent C
Solvent B
Solvent C
Solvent D
In a specific time step, each pump head delivers only one of the two channels (100%). It is
not possible to specify a mixing ratio for the two channels connected to the same pump
head (A and C; B and D). Before you can enter a value for B, you have to set D to 0. The
same applies to all other channels.
Example 1
If you enter a portion for solvent C while solvent A is already set, the portion for solvent A is
automatically reduced to 0%.
Example 2
For example, portions are set for B and C (for example, B=40%, C=60%) and you want the
pump to deliver D=20%. First, set C=100% and then, set D=20%. The pump will now deliver
D=20% and C=80%. The same applies to all other channels.
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