Watson-Marlow 202BA - Manual

205BA pumphead Installation and
operating
nstructions i
Introduction
Thank you for selecting the Watson-Marlow 205BA pumphead.
This pump head is very similar to the 202AA pumphead, but the 502BA has eight driven
rollers giving the benefit of delivering lower pulsation. It is easy-loading, uses the same
range of manifold tubing as the 202AA and is available in 4, 8 and 12 channel versions.
These supplementary instructions should be read in conjunction with either the
202U/AA or 202S/AA operating instruction manual.
Tube range
The tubing used in the 205BA is the same sizes and five materials of manifold tubing
manufactured for the 202AA - please see the relevant page in your manual.
Flow rates
These flow rates were obtained pumping water at 20C with zero suction and delivery
pressures. If flow rate is critical, it should be measured under operating conditions
where the important factors are suction and delivery, temperature and viscosity.
205BA flow rates at the maximum speed setting (50rpm)
Tubing internal diameter
0.13mm 0.19mm 0.25mm 0.38mm 0.50mm 0.63mm 0.76mm
0.005" 0.007" 0.01" 0.015" 0.02" 0.025" 0.03"
ml/min 0.025
0.060 0.130 0.240 0.40 0.75 1.05
Tubing internal diameter
0.88mm 1.02mm 1.14mm 1.29mm 1.42mm 1.47mm 1.52mm
0.035" 0.04" 0.045" 0.05" 0.055" 0.058" 0.06"
ml/min
1.40 1.85 2.28 2.93 3.48 3.75 3.98
Tubing internal diameter
1.65mm 1.85mm 2.05mm 2.38mm 2.54mm 2.79mm
0.065" 0.07" 0.08" 0.09" 0.1" 0.11"
ml/min
4.60 5.75 6.90 8.95 10.0 11.7
Cassette loading
For safety reasons, all cassettes should be in position in the pumphead during
normal running, even if some do not contain tubing.
Do not place fingers in the pumphead
Pumphead care and maintenance
When the pumphead needs cleaning, switch the drive off and isolate it from the mains.
Withdraw the cassettes from the pumphead and remove the tubing. Wash the cassettes
in water and mild detergent. If fluid has been spilled into the pumphead, removal of the
pumphead from the drive will make cleaning easier. Periodically, inspect all moving
parts for wear and ensure all bearings and rollers are free to rotate.