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Exercise BB - Manual control of flow rate
Objective
To manually control flow rate by varying the speed of a peristaltic pump.
Overview
Flow through a flow sensor is produced using a peristaltic pump. By manually
controlling the speed of the pump, the speed of flow is controlled.
Equipment Required
PCT40 bench.
Equipment set up
Ensure that the apparatus has been set up according to the Installation section.
Check that the mains water supply to the apparatus is off and the pressure regulator
is set to minimum. The apparatus should be connected to a suitable PC with the
PCT40 software installed, using the grey USB cable provided.
Take a length of 6.3mm diameter peristaltic tubing with a self-sealing fitting at one
end. Connect the quick-release fitting to the socket on SOL 1. Pass the other end
from right to left through the left-hand peristaltic pump (pump A) to a suitable drain.
Leave the lid of the pump open at this stage.
Take a second length of tube with a grey Guest push fitting at one end. Remove the
quick-release sealing plug from the end of the inlet plumbing (in front of SOL 1).
Connect the tubing to the pipe where the plug was located. Pass the other end from
right to left through the right-hand peristaltic pump (pump B) to a suitable drain.
Leave the lid of the pump open at this stage.
Check that the drain valve on the end of the plinth is open and that it is connected to
a suitable drain.
Procedure
Run the PCT40 software and select ‘Section 9: Flow Control’.
In the software, set the speed of pump B to 50%. Check that the rotor within the
pump rotates.
Turn the mains water supply to the apparatus on.
Carefully close the lid of the pump, ensuring that the tubing passes between the
guides on the sides of the pump and is not pinched. Water should be drawn through
the pump.
Increase the pump speed to 100%.
Adjust the pressure regulator on the inlet pipe of the apparatus to set the maximum
flow rate:
Pull the large grey knob on the pressure regulator away from the body of the
regulator.
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