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.
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