Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual page 231

Except for the dual-piston pumps (nos. 2a and 2b), all parts shown in the picture are
located in a plug-in flow meter module (no. 8).
For a detailed flow meter diagram for the ProFlow flow meter, see section 8.1.3.3, page 224.
8.1.3.2 Classic Flow Meter
In the Classic flow meter, each dual-piston pump (nos. 2a and 2b) is controlled by the
associated pressure sensor (nos. 4a and 4b). Each of these pressure-controlled pumps
(nos. 1a and 1b) delivers its partial flow through a calibrated flow restrictor (nos. 5a and
5b). Both partial flows are mixed in a Y piece (no. 7). The pressure at the flow meter outlet
(no. 8) is measured by the column pressure transducer (no. 6), which is connected to the Y
piece (7) by means of a short connection capillary (no. 9).
Both flow restrictors (nos. 5a and 5b) are located in a common flow selector cartridge that can
be replaced to select a different flow range.
The picture illustrates the functional blocks of the pump with the Classic flow meter.
Fig. 88: Functional blocks of the NC pump with a Classic flow meter
No. Element
Pressure-controlled pump, left (A) and
1a / 1b
right (B)
Dual-piston pump, left / right
2a / 2b
Filter unit, left / right
3a / 3b
Operating Instructions
NCS-3500RS and NCP-3200RS
No. Element
Column pressure transducer
6
Y piece
7
Flow meter outlet, capillary connection to
8
the other modules of the HPLC system
UltiMate 3000 Series:
Page 223