Armfield Instruction Manual
66
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
anticlockwise to reduce the flow to approximately 2/3 the original flow rate
(1000ml/min if the suggested flow rate of 1400ml/min was used) then lock the value
by pushing the knob back in.
Alter the feed rate again to approximately half the original value (700ml/min if a flow
rate of 1400ml/min was used), using the pressure regulator as before.
Continue to reduce the feed rate until the fluid level in the vessel no longer returns to
the set point level (the drain rate exceeds the inlet flow rate).
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Effect of Inlet and Outlet Flow Rates
Investigate the effect of an inflow rate greater than the outflow rate, and of an outflow
rate greater than the inflow rate.
Select the
icon to begin data logging.
Decrease the outflow rate by closing the drain valve in the base of the vessel, but do
not completely close the valve. This will decrease the outflow rate compared to the
inflow rate. Note the control actions required in the operation of valve SOL1 to
maintain fluid level.
Increase the outflow rate compared to the inflow rate by fully opening the drain valve.
Continue to maintain the level in the process vessel.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Reset the inlet flow rate to its original value (usually 1400 ml/min), and adjust the
drain valve to its original partly closed setting.
Effect of Vessel Volume
Carefully remove the lid on top of the large process vessel and remove the inner
cylinder. This increases the effective volume of the process vessel.
Select the
icon to begin data logging.
Manually maintain the fluid level in the tank at its Set Point level.
Select the
icon to finish data logging.
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