Exercise H
87
Allow the fluid level in the process vessel to approach a value of 200mm. By
switching the valve SOL 2, control the outflow rate in order to maintain the fluid level
at 200mm.
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 valve SOL 3:
Select the
icon to begin data logging.
In the software, select the switch to open valve SOL 3. Operate valve SOL 2 in order
to maintain a fluid level of 200mm.
Close valve SOL 3 and continue to maintain the fluid level.
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, change the setting of the Proportioning Solenoid Valve
as shown in the software. A step change may be produced by typing the new setting
directly into the display box. A change of 20% of total range up or down is suggested.
Use the valve SOL 2 to maintain fluid level. Note the change in control action
required due to the inlet flow rate change, and whether the change in flow rate was
an increase or a decrease.
Change the PSV valve setting to 100% (fully open). Note whether the fluid level can
be maintained using SOL 2 alone at this maximum inlet flow rate.
Change the PSV valve setting to 0% (fully closed). Again note whether the fluid level
can be maintained using only valve SOL 2 at this minimum 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.
Return the PSV valve setting to the valve it was set to before commencing the next
section of the exercise.
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.
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