Process control instrumentation technology
This book gives readers an understanding and appreciation of some of the theories behind control system elements and operations--without advanced math or calculus. It also presents some of the practical details of how elements of a control system are designed and operated--without the benefit of on-the-job experience. Chapter topics include process control; analog and digital signal conditioning; thermal, mechanical, and optical sensors; controller principles; and control loop characteristics. For those in the industry who will need to design the elements of a control system from a practical, working perspective, and comprehend how these elements affect overall system operation and tuning.
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INTRODUCTION TO PROCESS CONTROL
ANALOG SIGNAL CONDITIONING
DIGITAL SIGNAL CONDITIONING
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acceleration accelerometer actual adjusted amplifier analog analog signal Angular frequency applications binary number Bode plot bridge bridge circuit Calculate chapter characteristics circuit constant control loop control system controlled variable controller modes controller output converts data logging defined derivative detector deviation device dynamic variable electrical electronic Equation error example final control element flow diagram flow rate frequency implemented linear liquid load change maximum measurement method microcomputer motor neutral zone Note null octal offset oscillation output voltage parameters phase pneumatic pressure problem process-control loop proportional band proportional controller proportional gain proportional mode proportional-integral rad/s radiation range resistance resistor response sample scale setpoint setpoint value shown in Figure signal conditioning SOLUTION specific speed temperature thermistor thermocouple three-mode controller tion transducer transfer function two-position typical unit voltage volts wavelength zero