Watson-Marlow 114 - Manual (Page 8)

Watson-Marlow Alitea 114 pumpheads: operating instructions 8
0.3
0.25
0.2
0.15
0.1
0.05
0
Nm
Tube bore
0.5
Torque requirement, 1.6mm wall tube
0.8
1.6
2.4
3.2 4.0 4.8
Required torque depends on many parameters. The chart above includes standard
materials, direction, occlusion setting, pressure and running temperature.
Starting torques are approximately the above figures x 2.
Assess your application’s torque requirement from the top of the arrows if all the
parameters listed are those requiring more torque, as shown in the graph below, or
to be sure to have sufficient torque for all conditions; use the bottom of the arrows
if all the parameters listed are those requiring less torque, as shown in the graph
below.
Factors affecting torque requirement
Pumpsil
CW
Standard occlusion
High temperature
CCW
Bioprene
+Pressure occlusion
Low temperature
More torque
Less torque
6 Torque requirement
114DV, 114DVP