Thermo Scientific Dionex UltiMate 3000 Series, Operating Instructions Manual, Page: 230 / 270

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Page 222 Operating Instructions
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 No. Element
1a / 1b Flow-controlled pump, left (A) and
right (B)
5a / 5b Thermal flow sensors, left/right
2a / 2b Dual-piston pump, left / right 6
Y piece
3a / 3b Filter unit, left / right 7
Flow meter outlet, capillary connection to
the other modules of the HPLC system
4a / 4b Primary pressure transducer, left / right 8
Flow meter module