Armfield Instruction Manual
114
Log for 15 minutes, then set the PSV to 100%.
Continue logging for 15 minutes, then set the PSV to 0%.
Log for a final 15 minutes, then select the
icon to finish data logging.
Temperature Set Point
Investigate the effect of changing the temperature at which the on/off heater switch
operates:
In the software, alter the temperature set point to 50°C.
Select the
icon to begin data logging.
Log for 15 minutes, and then select the
icon to finish data logging.
Select the
icon to create a new results sheet.
Repeat the procedure, altering the set point and logging the change in temperature
until the oscillations reach stable values. Suggested values for the temperature set
point value are 60, 70 and 80°C. Remember to create a new results sheet for each
set of data.
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 N).
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.
Give examples of industrial control situations in which each type of variation in
starting conditions might occur. For each example, consider the suitability of an on/off
controller for that particular application.
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