Exercise W
151
Note that there is a safety temperature cutout set to switch off the heating element if
the water temperature exceeds approximately 80°C. This will override any other
heater controls. It is suggested that thermostat Set Points close to or above 80°C are
avoided.
Repeat the investigation of Set Point with the gear pump set to 50%.
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Flow Rate’, ‘Set Point’, etc.). The entire workbook should
be saved with a suitable filename for future reference (e.g. PCT40 Exercise W).
Each set of data should be plotted on a graph of temperature T3 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
effect mixing (using the gear pump) has on the results.
Give examples of industrial control situations for which a simple on/off controller
would be suitable.
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