Armfield Instruction Manual
120
Switch on mains power to the apparatus and run the PCT software. Select ‘Section 5:
Temperature Control (direct batch heating)’.
Fill the small process vessel with water:
Using a length of tubing with a quick release fitting at both ends, connect the PSV to
one of the fittings on the side of the small process vessel. Ensure that the other fitting
on the side of the process vessel is not connected.
Close the drain valve on the process vessel.
In the software, set the PSV to 100% and watch as the small process vessel fills with
water.
Wait until the coil inside the vessel is fully covered with water, then set the PSV to
0%.
Disconnect the tube from the small process vessel, then disconnect the other end
from the PSV.
Take a length of tube with a quick release fitting at one end and a Guest push fitting
at the other. Connect one end to the PSV and the other end to the coil inside the
small process vessel (via the push fitting mounted on the lid).
Take a second length of tube with a quick-release fitting at one end and a drain valve
at the other. Connect this end to the other side of the coil, and direct the opposite end
of the tube to a suitable drain. Open the drain valve at the end of the tube.
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.
Select ‘Configure’ from the Sample menu, and set sampling to Automatic at intervals
of 30 seconds, with duration as Continuous.
In the PCT40 software, enter a set point value for the temperature of 30 degrees
centigrade. If the local water temperature is close to 30°C then a higher value may be
selected. At least 10°C higher than the mains water temperature is recommended.
Set the PID values for the controller in the appropriate boxes in the software.
Suggested starting values are Proportional Band (P) of 100%, Integral Time Constant
(I) of 0s and Differential Time Constant (D) of 0s.
Set the software to log at intervals of 10 seconds.
Select the
icon to begin data logging.
Log the temperature within the vessel for 10 minutes, then select the
icon to stop
logging.
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