Watson-Marlow Alitea 114 pumpheads: operating instructions
12
9 Flow rates and pressure
capabilities
Pumping conditions
For precise and repeatable performance it is important to determine flow rates under
operating conditions for each new piece of tubing.
114 pumpheads’ flow rates are the same whether rotating clockwise (cw) or count-
er-clockwise (ccw). Their pressure capabilities vary depending on rotation sense.
114, cw and ccw rotation:
Flow rates, ml/min
Tube bore
size
0.5mm
0.8mm 1.6mm 2.4mm 3.2mm 4.0mm 4.8mm
ml/rev
0.02
0.04
0.14
0.29
0.47
0.67
0.85
30 rpm
0.7
1.3
4.2
8.7
14
20
25.5
60 rpm
1.4
2.6
8.4
17.5
28.5
40.5
51
100 rpm
2.2
4.3
14
29
47.5
67
85
190 rpm
4.3
8.2
26.5
55
90.5
128
160
200 rpm
4.6
8.6
28
58
95
135
170
350 rpm
8.0
15
49
100
165
235
300
400 rpm
9.1
17
56
115
190
270
340
600 rpm
13.5
26
84
175
285
405
510
Flow rate tests were carried out using water at zero suction pressure and Bioprene
tubing, with the pumphead rotating cw. Actual flow rates achieved may vary because
of changes in temperature, viscosity, inlet and discharge pressures, system config-
uration and tubing performance against time. Flow rates may also vary due to nor-
mal manufacturing tolerances of the tubing.
Reduce the flow rates quoted by 10% if using Pumpsil tubing.
Recommended tubing
114DV: Bioprene, Marprene, Pumpsil, STA-PURE PCS and STA-PURE PFL
(formerly CHEM-SURE).
114DVP: Bioprene, Marprene, Pumpsil, STA-PURE PCS, STA-PURE PFL
(formerly CHEM-SURE), PVC and Neoprene.
114DV, 114DVP
114DV
114DVP
