Installation, Flow rates – Watson-Marlow 501RL User Manual
Page 10
Part 3: 205BA & 505BA pumpheads
Description
The 205BA/505BA pumpheads have eight rollers driven by planetary gearing
providing virtually pulse free flow. They are easy loading cassette pumpheads
available in 4, 8, 12 or 16 channel versions. If more channels are required, 12
or 16 channel 205BAX/505BAX extension pumpheads can be added.
Installation
Remove the drive-shaft cover from the 205BA/505BA and fit the pumphead
over the drive "nose" (1), ensuring that the tongue on the drive shaft locates
on the slot in the pumphead centre shaft. Tighten the retaining screws (2) at
the top and bottom of the mounting plate.
1
2
3
4
To fit an extension pumphead, remove the end cover
plate (3) on the first pumphead, exposing the two locating
pins and the drive shaft slot. Spring off the planetary gear
system cover plate from the 205BAX/505BAX extension
pumphead.
Fitting an
extension
pumphead
Locate the 205BAX/505BAX extension pumphead on to the two locating pins,
ensuring that the tongue of its drive shaft engages in the slot in the shaft of
the 205BAX/505BAX. Tighten the two retaining screws (4) on the right and left
of the 205BAX/505BAX to be added. Fit the end plate to the last pumphead.
Flow rates
These flow rates were obtained using PVC tubing pumping water at 20C with
zero suction and delivery pressures. Critical flow rates should be measured
under operating conditions where the important factors are suction and
delivery, temperature and viscosity. Flow rates are given in ml/minute.
205BA flow rates (ml/min)
Tubing internal diameter (mm)
0.13 0.19 0.25 0.38
0.50
0.63
0.76 Maximum
Drive rpm
0.005" 0.007" 0.01" 0.015"
0.02" 0.025"
0.03" Channels
205S &
0.5 0.0003 0.0011 0.001 0.002
0.004
0.007
0.011
32
205U 90
0.045 0.116 0.265 0.439
0.720
1.30
1.89
32
0.88 1.02 1.14 1.29
1.42
1.47
1.52
32
Drive rpm
0.035" 0.04" 0.045" 0.05" 0.055" 0.058"
0.06"
32
205S &
0.5 0.014 0.019 0.023 0.029
0.035
0.038
0.040
32
205U 90
2.52 3.33 4.10 5.27
6.25
6.78
7.15
32
1.65 1.85 2.05
2.38
2.54
2.79
32
Drive rpm
0.065" 0.07" 0.08" 0.09"
0.1"
0.11"
32
205S &
0.5 0.046 0.057 0.069 0.089
0.010
0.117
32
205U 90
8.26 10.3 12.4 16.1
18.0
21.0
32
The 205BA pumphead is dedicated to the 205S and 205U drives.
11