Armfield Instruction Manual
108
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Flowrate’, ‘Volume’, etc.). The entire workbook should be
saved with a suitable filename for future reference (e.g. PCT40 Exercise M).
Each set of data not already graphed as part of the procedure should be plotted on a
graph of fluid level against time.
Make a comparison of each variation in the experimental conditions against the
graph of the initial set of results, noting the difference in response. Comment on the
results obtained by varying the values of P, I and D, and on the ease of optimisation
of the process. Compare the results obtained using PID control against those using a
simple on/off controller (as in Exercise K).
Give examples of industrial control situations in which each type of variation in
experimental conditions might occur. For each example, consider the suitability of
PID control for that particular application.
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