![background image](http://html.mh-extra.com/html/watson-marlow/100-series/100-series_manual_876371026.webp)
Watson-Marlow 114DV pumphead: operating instructions
7
3.8 114DV
Performance data
Flow rates are normalised test values obtained using
new tubing with the pumphead rotating clockwise
pumping water at 20C with negligible inlet and
discharge pressure. Actual flow rate achieved may
vary because of changes in temperature, viscosity,
inlet and discharge pressures, system configuration
and tubing performance against time. Flow rates may
also vary due to normal manufacturing tolerances of
the tubing. These tolerances will make flow rate
variance more pronounced at smaller bore sizes.
For precise and repeatable performance it
is important to determine flow rates under
operating conditions for each new piece of
tubing.
Note
: Flow rates quoted have been rounded for
simplicity, but are accurate to within 5%, well
within the normal tubing tolerance variation of
flow rate. They should therefore be taken as a
guide. Real flow rates in any application must be
determined empirically.
120F: All tubing materials (ml/min)
Fixed
speed
0.5
mm
0.8
mm
1.6
mm
2.4
mm
3.2
mm
4.0
mm
4.8
mm
10 rpm
0.2
0.4
1.4
2.9 4.7 6.7 8.5
17 rpm
0.3
0.7
2.4
4.9
8
11
14
31 rpm
0.6
1.2
4.3
9.0
15
21
26
52 rpm
1.0
2.1
7.3
15
25
35
44
220 rpm
4.4
8.8
31
64
100 150 190
120S: All tubing materials (ml/min)
Speed
0.5mm
0.8mm
1.6mm
2.4mm
3.2mm
4.0mm
4.8mm
1-200
rpm
0.02-4
0.04-8
0.14-28
0.29-58
0.47-94
0.67-130
0.85-170
120U: All tubing materials (ml/min)
Speed
0.5mm
0.8mm
1.6mm
2.4mm
3.2mm
4.0mm
4.8mm
0.1-200
rpm
0.002-4
0.004-8
0.01-28
0.03-58
0.05-94
0.07-130
0.09-170
Pressure and flow performance curve
Marprene tubing, 1.6mm wall, 100 rpm, CCW
rotation.
Note
: The 120S and the 120U must be
run counter-clockwise to achieve pressures up to 2
bar. The 120F is a transfer-only, 0 bar pump.
suction (bar) pressure (bar)
0
1
2
Flow rate: ml/min
0
20
40
70
80
100
10
30
50
60
90
-0.5
-0.3
0
-0.1
-0.2
-0.4
114DV, standard occlusion
pressure (+) bar
suction (-) bar
-0.5 -0.4 -0.3 -0.2 -0.1 0
100
90
80
70
60
50
40
30
20
10
0
ml/min
0
1
2
4.8 x 1.6
4.0 x 1.6
3.2 x 1.6
2.4 x 1.6
1.6 x 1.6
0.8 x 1.6