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Article: How should I calibrate, part 2: calibrating and testing control components on your heat process. (Heating Highlights).
- Article from:
- Process Heating
- Article date:
- October 1, 2002
- Author:
CopyrightCOPYRIGHT 2002 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Last month, I covered the test equipment you should have in your calibrating toolbox. In this issue, I'll explain control signal and temperature sensor calibration.
Control Signals. Control signals are put out by controllers and expect to be obeyed by such final control devices as motorized valves, electropneumatic valves, motor drives and SCR heater controllers. How well they are obeyed is often pretty rough and nonlinear. Checking at this stage--while nor called calibration--is important to control performance.
You can inject simulated control signals into these devices and see what the output does. Be wary about what their feedback signals (if any) ...