Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual page 232

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
No. Element
Primary pressure transducer, left / right
4a / 4b
Flow restrictor, left / right
5a / 5b
For a detailed flow meter diagram for the Classic flow meter, see section 8.1.3.3
(→ page 224).
8.1.3.3 Flow Meter Diagrams
The pictures show how the flow and solvent composition are controlled.
The control unit calculates the required partial flow rates, Fl
channels from the set total flow rate and the set solvent composition (gradient point).
Fig. 89: Operating principle of the pump (Classic flow meter)
In case of the Classic flow meter, Fl
resistance R and R
A B
added to obtain the set primary pressures P
B deliver the related pressures so that exactly the required partial flows pass the restrictors R
and R . Both partial flows are combined at the flow meter outlet so that the desired total flow
B
rate and solvent composition are delivered.
Page 224
and Fl
Set_A
of the corresponding flow restrictor. Then, the column pressure P
No. Element
Capillary connecting the column pressure
9
transducer to the Y piece
Flow meter module
10
Set_A
are multiplied by the known fluidic
Set_B
and P . The constant pressure pumps A and
Set_A Set_B
and Fl , for both
Set_B
Col
Operating Instructions
is
A