Armfield Instruction Manual
90
Type in the Set Point value at which the on/off controller will operate. A
recommended starting value is 200mm for pressure.
Apply the settings and close the controller window.
Set data logging to automatic at intervals of ten seconds. Check that the level
reading L1 is varying with the rising water levels.
Partially close the drain valve at the base of the large process vessel to produce a
constant low outflow to drain.
Select the
icon to begin data logging.
Note the behaviour of the valve SOL 2 as the fluid level approaches the pressure set
point.
Continue logging until the oscillations in fluid level reach stable values for magnitude
(height) and duration. Select the
icon to finish data logging.
Disturbances
Within the software it is possible to introduce disturbances in the outflow from the
vessel by opening the Normally Closed solenoid valve SOL 3:
Create a new results sheet by selecting the
icon in the tool bar of the software.
Select the
icon to begin data logging.
On the software screen, select the switch that operates valve SOL 3.
Allow the fluid level oscillations to settle to their original values.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Select the
icon to begin data logging.
Close the valve SOL 3.
Allow the fluid level oscillations to settle to their original values.
Select the
icon to finish data logging.
Set Point
Investigate the effect of changing the pressure level at which the on/off controller
operates SOL 1:
In the software, select the Controller button then alter the Set Point to 100mm. Apply
the new setting and close the controller window.
Select the
icon to begin data logging.
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