Operating Principle - Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS

8.1.3 Operating Principle

The NC pump provides two essentially identical solvent channels A and B. Each channel
has a dual-piston pump that can deliver flow continuously without need for refill cycles.
The flow meter module includes several sensors that measure the channel pressures and
flow rates, and thus control the pumps such that they meet the set values. At the flow meter
outlet, both partial flows are mixed, which results in the desired flow rate and solvent
composition.
8.1.3.1 ProFlow Flow Meter
In the ProFlow flow meter, each dual-piston pump (nos. 2a and 2b) is controlled by the
associated thermal flow sensor (nos. 5a and 5b). The partial flows of these flow-controlled
pumps (nos. 1a and 1b) are mixed in a Y piece (no. 6) at the outlet of the flow meter.
The picture illustrates the functional blocks of the pump with a ProFlow flow meter.
Fig. 87: Functional blocks of the NC pump with a ProFlow flow meter
No. Element
Flow-controlled pump, left (A) and
1a / 1b
right (B)
Dual-piston pump, left / right
2a / 2b
Filter unit, left / right
3a / 3b
Primary pressure transducer, left / right
4a / 4b
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No. Element
Thermal flow sensors, left/right
5a / 5b
Y piece
6
Flow meter outlet, capillary connection to
7
the other modules of the HPLC system
Flow meter module
8
Operating Instructions