Exercise T
137
Temperature Set Point
Investigate the effect of changing the temperature at which the on/off heater switch
operates:
Create a new results sheet by selecting the
icon.
In the software, alter the temperature set point to 40°C (or ten degrees higher than
the original set point temperature if a value other than 30°C was selected).
Select the
icon to begin data logging.
Log the temperature for 10 minutes, then select the
icon to finish data logging.
Repeat the procedure, altering the set point and recording the change in temperature
over time. Suggested values for the temperature set point value are 50 and 60°C, but
more values may be attempted if laboratory time allows. Remember to create a new
results sheet for each set of data. Note that there is a safety cutout in the heater
circuit that will switch off the heater if the temperature in the vessel exceeds
approximately 80°C. Set Point values should therefore be kept well below this
temperature.
Return the temperature set point to its original value.
Cycle Time
Create a new results sheet by selecting the icon in the tool bar of the software.
In the software, set the cycle time to 5s.
Select the
icon to begin data logging.
Log the temperature in the vessel for 10 minutes, and then select the
icon to
finish data logging.
Alter the cycle time again, to 20s.
Select the
icon to begin data logging.
Log the temperature in the vessel for 15 minutes, and then select the
icon to
finish data logging.
Reset the cycle time to 10s.
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 T).
Each set of data 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. Compare the
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