Armfield Instruction Manual
150
Disturbances
Within the software it is possible to introduce disturbances in the temperature inside
the process vessel by changing the flowrate of water through the vessel:
In the software, select the
icon to create a new results sheet.
Select the
icon to begin data logging.
In the software, increase the PSV setting by 20%. Open the drain valve at the base
of the process vessel enough to balance the flow in and out of the vessel, so that the
fluid level in the vessel remains constant.
Log the temperature for 10 minutes.
Select the
icon to finish data logging.
Plot a graph of T3 against time, as before, and modify the thermostat setting as
before. Make further data logging runs as before until T3 is maintained at or near the
desired Set Point value. Remember to select a new results sheet before each data
logging run.
Set the gear pump to 50% to circulate and mix the water in the process vessel, and
repeat the investigation of disturbances.
If time allows, make a further adjustment of 20% in the PSV setting, and adjust the
thermostat to maintain the temperature of T3. Note whether it is possible to maintain
the original Set Point at this increased flow rate.
Return the settings for the PSV and the thermostat to their original values.
Temperature Set Point
Investigate the effect of changing the temperature set point for T3:
Select the
icon to create a new results sheet.
Choose a new Set Point value for T3. 40°C is suggested, unless this was the initial
value chosen, when 50°C may be used instead.
Using the previous data gathered as a reference, adjust the temperature set point on
top of the thermostat in a way that should produce the desired change in T3.
Select the
icon to begin data logging.
Log the temperature for 5 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 temperature T3 can be maintained at or near the desired value. Remember
to create a new results sheet for each set of data.
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