Armfield Instruction Manual
78
Allow the fluid level to rise until it reaches the desired level in the vessel. 200mm is
suggested.
In the software, enter a value of 0% for the PSV setting to close the valve and stop
the inlet flow.
Observe that the fluid level in the large process vessel falls as water continues to
drain.
Select the
icon to begin data logging.
Enter a value of 50% for the PSV, then use the arrow keys to adjust this value up or
down to return the fluid level in the vessel to 200mm. By continuing to operate the
PSV via the software, adjust the inlet flow rate to maintain the fluid level in the
process vessel at a constant value. Do not adjust the drain valve as this will change
the PSV setting required.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Disturbances
Within the software it is possible to introduce disturbances in the outflow from the
vessel by opening the Normally Closed solenoid valves SOL 2 and SOL 3.
Create a new results sheet by selecting the appropriate icon in the tool bar of the
software.
Select the
icon to begin data logging.
In the software, select the switch to open valve SOL 2. Adjust the PSV valve setting
to maintain the fluid level in the process vessel. Note the adjustment required.
Close valve SOL 2 and open valve SOL 3. Once again note the control action
required to maintain the fluid level in the process vessel.
Open valve SOL 2 so that both valves SOL 2 and SOL 3 are open. Note whether it is
possible to maintain the fluid level in the vessel by controlling the PSV valve alone.
Close both valves SOL 2 and SOL 3 and allow the fluid to return to the set point.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Feed Rate
Select the icon to begin data logging.
To change the inlet feed rate, adjust the pressure regulator on the inlet pipe of the
apparatus: Pull the knob outwards from the body of the regulator, turn the knob a
half-turn anticlockwise then lock the value by pushing the knob back in.
Note the action required to maintain the fluid level in the process vessel.
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