Armfield Instruction Manual
146
Check that the drain valve on the end of the plinth is open and that it is connected to
a suitable drain.
Procedure
SAFETY NOTE: During this exercise, the apparatus may reach temperatures hot
enough to cause burns or scalds. Do not touch the process vessel during the
exercise, or remove the coil or sensors from within the vessel. Allow the apparatus to
cool before draining the water or disconnecting any of the tubes from the process
vessel.
Switch on mains power to the console and run the PCT40 software.
Check that the temperature readings T1, T2 and T3 are giving sensible values
(usually between 5 and 30 degrees Celsius depending on mains water temperature).
The heating element is switched on and off manually using the switch on the
software screen. Switch on the heater, and observe the temperature T1. Check that
this rises as the heater operates. Switch off the heater again.
Select ‘Configure...’ from the Sample menu and set data logging to Automatic with a
sample interval of 10 seconds and Continuous duration.
Heating Characteristics in Continuous Operation
The temperature in the vessel may be manually controlled by switching the power to
the heating element off and on. By switching the heater on and off using the switch
on the software screen raise the temperature of the water in the vessel to 30°C and
maintain this temperature by powering the heater off and on. Note the control actions
required to maintain a constant temperature within the water flowing through the
vessel. Record any differences between the time required for the water to rise and
fall in temperature. Note any time lag between applying a control action and
observing its effect.
Select the
icon to begin data logging.
Control the temperature manually for five minutes.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon.
The water in the small process vessel may be circulated (stirred or mixed) using the
gear pump. Set the gear pump to 50% and repeat the procedure in the paragraph
above, noting any difference in response between the system with and without the
gear pump in operation.
Select the
icon to begin data logging.
Control the temperature manually for five minutes.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon.
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