Armfield Instruction Manual
56
Select the
icon to begin data logging.
In the software, select the switch to open valve SOL 2.
Allow the fluid level oscillations to settle to steady values.
Open valve SOL 3, so that SOL2 and SOL3 are both open.
Note whether the fluid level oscillates around the pressure switch set point or
continues to drain from the process vessel.
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.
Feed Rate
Create a new results sheet by selecting the icon in the tool bar of the software.
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 gradually anticlockwise to reduce the indicated flow rate to 1000ml/min
(or to a value that is approximately 2/3 of the previous flow rate if this was less than
1400ml/min).
Lock the value by pushing the knob back in.
Allow the oscillations in fluid level to reach steady values of magnitude and duration.
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.
Alter the feed rate to 700ml/min (or to half the original flow rate if this was less than
1400ml/min).
Allow the fluid level oscillations to stabilise again.
Select the
icon to finish data logging.
Continue to reduce the feed rate and log the results until the fluid level in the vessel
no longer returns to the set point level (the drain rate exceeds the inlet flow rate).
Remember to create a new results sheet for each set of data.
Open the pressure regulator again: Pull the knob outwards from the body of the
regulator and turn the knob steadily clockwise until the flow rate (indicated in the
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