Process Control Instrumentation Technology
This manual is designed to provide users with an understanding and appreciation of some of the theoretical concepts behind control system elements and operations, without the need of advanced math and theory. It also presents some of the practical details of how elements of a control system are designed and operated, such as would be gained from on-the-job experience. This middle ground of knowledge enables users to design the elements of a control system from a practical, working perspective, and comprehend how these elements affect overall system operation and tuning. This edition includes treatment of modern fieldbus approaches to networked and distributed control systems. Generally, this guidebook provides an introduction to process control, and covers analog and digital signal conditioning, thermal, mechanical and optical sensors, final control, discrete-state process control, controller principles, analog controllers, digital control and control loop characteristics. For those working in measurement and instrumentation and with control systems and PLCs.
INTRODUCTION TO PROCESS CONTROL
ANALOG SIGNAL CONDITIONING
DIGITAL SIGNAL CONDITIONING
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acceleration accelerometer actual amp circuit amplifier analog application binary number Bode plot bridge circuit capacitor cell chapter characteristics constant control system controlled variable controller modes controller output converter conveyor curve defined detector device differential amplifier discrete-state electrical electronic energy Equation error EXAMPLE fieldbus filter final control element flow rate frequency given heater impedance implemented input voltage instrumentation amplifier integral ladder diagram light linear liquid load maximum measurement motor offset operation output voltage PID controller pneumatic Problem process-control loop programmable logic controllers radiation range reference relay resistance resistor response sample Section setpoint shown in Figure shows signal conditioning Solution specific speed strain gauge switch temperature thermal thermistor thermocouple tion transducer transfer function TRIAC typical valve variation varies versus wavelength wire zero