These are documents and circuits which will help learn Basic Temperature closed loop control, There are many ways to control temperature.
for Industrial Controls
The first one is an electronic emulation of Thermostat or Electro-Mechanical Controls. The second is Time Proportional like a slow PWM. The third is the complete adaptive control.
While the first is like a limit switch, the second works like a SMPS, the third PID takes into account the speed of the process and dynamic changes or disturbances of the system and compensates in real time.
Example - In a Oven, one batch may have 100 metal boxes to heat, the second batch may have 10 boxes, the door may be frequently opened and the mains power (heater) may be fluctuating. A system that is able to adapt to these changes, without much readjustments is the objective of an ideal process control. The Accuracy and the Energy efficiency being the most important.
This could take current or voltage inputs from many remote
transmitters, 4-20mA or 0-1 V Inputs. Then it would display the
calibrated value in a LED display. The Zone number was a digital
display. This serves as a monitor of process values. It had a
analog output with a digital channel byte-word output for
interface with other instruments.
This is a Milli-Volt and Milli-Amp Source for Calibration of
Temperature Measurement and Control Instruments using
Thermocouples. There is also a Passive Variable Resistance
Source for Simulating a PT-100 RTD Sensor.
This calibrator was a simple solution i built. This
instrument itself was calibrated by Instruments like the
Calibrators from Omega which are the best you can get.
Back to Process Control Instrumentation
30th Aug 2020
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