Armfield Instruction Manual
158
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.
Run the PCT40 software and select ‘Section 7: Temperature Control (indirect
heating)’.
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 PSV and connect it to one side of the gear pump.
Using another length of tube with quick release fittings at both ends, connect the
other socket on the side of the small process vessel to the other side of the gear
pump.
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 quick-release fitting mounted on the lid).
Take a second length of tube with a quick-release fitting at one end and an open end
at the other. Connect the quick release fitting to the other side of the coil, and direct
the opposite end of the tube to a suitable drain.
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.
In the PCT40 software, enter a set point value for the temperature of 30 degrees
centigrade, unless the local water temperature is close to this value when 40°C may
be chosen instead.
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 automatic logging at intervals of 10 seconds with continuous
duration.
Select the
icon to begin data logging.
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