Armfield Instruction Manual
144
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Flow Rate’, ‘Integral Setting’, etc.). The entire workbook
should be saved with a suitable filename for future reference (e.g. PCT40 Exercise
U).
Each set of data not already graphed as part of the procedure should be plotted on a
graph of temperature T1 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. If the level control exercises have already been performed, compare
the ease of optimisation for temperature control with the optimisations for PID level
control. Compare the results obtained using PID temperature control against those
using a simple on/off controller (as in Exercise Q) and time proportioning control
(Exercise T). Discuss the suitability of PID control for regulating process temperature.
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