Armfield Instruction Manual
154
When you have finished, continue logging the steady value for a further 2 minutes,
then select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Controller-controlled time proportioning
In the PCT40 software, select ‘Control’ to open the PID controller window.
Set the Set Point to 30°C (if local mains water supply is close to 30°C then a higher
Set Point value should be selected. 10°C higher than the mains water temperature is
recommended).
Leave the PID settings and the Cycle Time unchanged.
Select the Automatic Control radio button and click on ‘Apply’. The valve should
begin to operate intermittently as the time proportional controller sends signals to
control it.
Select the
icon to begin data logging, and observe the temperature T3. Note the
behaviour of the heater as the temperature approaches the Set Point. When the
oscillations around the Set Point have settled, select the
icon to finish data
logging.
In the graph screen of the software, plot a graph of temperature T3 against time. New
plots will be added automatically as the software records them.
Log the temperature within the vessel for 10 minutes, then select the
icon to stop
logging.
Select the
icon to create a new results sheet.
Effect of stirring
Set the PSV to 100%, allowing cold water to flow through the coil in the small
process vessel. When the temperature T1 has reduced to around 20 – 30°C, set the
PSV back to 20%.
Set the Hot Pump to a speed of 50% to circulate (stir or mix) the water in the process
vessel.
Select the
icon to begin data logging.
Log the temperature within the vessel for 10 minutes, then select the
icon to stop
logging.
Return the gear pump setting to 0%.
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.
To Next Page
Loading...