14
m-505ca-en-01
11 CA cassette adjustment and flow
rates
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Flow rates for pumping water at 20 °C with zero suction and delivery pressure in PVC tubing, with
clockwise rotation of the pumphead are published at the back of this manual.
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Dedicated occlusion adjustment with a vernier indicator has been incorporated into the cassette.
This is to enable repeatable accurate flow rates despite variations that may be caused by the system
or when pumping fluids other than water.
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The track geometry has been designed so that when the indicator is at the centre position it is
indicating the normal set-up.
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To adjust, pull out the adjusting knob and turn. To lock, push back.
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Moving the indicator towards the '+' will increase the track occlusion (reduced roller/track gap)
enabling higher pressures to be obtained without a fall off in flow rate.
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Moving the indicator towards the '-' will reduce the occlusion. Remember that higher the occlusion,
the shorter the tube life.
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The mechanism also enables small adjustments in the flow rate. This is particularly useful when
using a number of channels where the inter channel flow rate is critical. As a guide only, one
graduation move will vary the flow by approximately 1%.