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The
precision digital controller is designed for fully automatic
microcontroller-controlled reaction vessels. With high
mass-transfer efficiency, this controller is used for
developing and manufacturing fine chemicals and bioengineered
products as well as drugs and their intermediates. Such
applications impose stringent requirements on temperature
and pH maintenance, foaming, and oxygen content over extended
periods of time (i.e., exceeding 48 hours). Such a facility
would help research labs and pharmaceuticals to define
application-specific control formats for multi-loop and
cascade-control configurations.
The
heart of the system is the CY8C26443-24PI. The ADC, PWM,
PGA, and timer blocks of the microcontroller were configured
to meet the application's requirements. An LCD panel is
connected to port 1 to display the values of the parameters
dynamically. Also, an audio buzzer is connected to port
2 to warn about parameter values that exceed the range.
A timer module counts the on time.
H.N.
Naveen and S. G. Sriharsha
India
navmys@lycos.com,
sriharshasg@yahoo.co.in
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