Armfield Instruction Manual
176
Note how easy it is to maintain a fixed flow rate using manual control, and how
quickly the system responds to control actions.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Disturbances
Within the software, it is possible to introduce a disturbance to the system by
increasing the flow rate using a second peristaltic pump:
Select the
icon to begin data logging.
In the software, set the speed of pump B to 10%
Note how rapidly the flow rate changes as a result of this new setting, and the control
actions required to return the flow rate to its previous value.
Set the speed of pump B to 30%, and once more note the speed of response and the
action required to return the flow rate to the Set Point.
Set pump B to 0%. Note any difference between the response produced by an
increase in pump speed.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Disturbance’, etc.). The entire workbook should be saved
with a suitable filename for future reference (e.g. PCT40 Exercise BB).
Each set of data not already graphed as part of the procedure should be plotted on a
graph of flow rate F1 against time.
Write up your experiment, discussing the speed of response when controlling Flow
Rate directly, and the ease of manual control for this variable. Comment on the
sensitivity of the process to disturbances.
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