Armfield Instruction Manual
110
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.
Check that the temperature reading T1 is a sensible value (usually between 5 and 30
degrees Celsius depending on mains water temperature).
A target temperature for the fluid in the vessel is required. 40 degrees centigrade is
suggested. (If the mains water temperature is very high- approaching or exceeding
30 °C- then 50 °C may instead be used as the target Set Point 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.
Heating Characteristics in Batch Operation
The temperature in the vessel may be manually controlled by switching the power to
the heating element off and on. When using manual control, consideration should be
given to the following:
Time lag between applying a control action and observing a response.
Differences in the rate of heating and cooling.
Take notes on these and other factors that affect the control actions required to reach
and then obtain a constant temperature within the process vessel.
Select the
icon to begin data logging.
Manually control the temperature in the tank for a period of five minutes.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon.
Disturbances
Within the software it is possible to introduce disturbances in the temperature inside
the process vessel by passing cold water through the coil inside the vessel:
Select the
icon to begin data logging.
In the software, send cold water through the coil within the process vessel by setting
the PSV to 50%.
Control the heater to maintain the temperature in the vessel.
Increase the PSV setting to 100%.
Continue to control the temperature at the chosen Set Point value.
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