工业信号调理教程 Industrial Signal Conditioni.pdf

Industrial Signal Conditioning, A Tutorial OVERVIEW OF INDUSTRIAL MEASUREMENT 2 USES OF INDUSTRIAL MEASUREMENT2 INDUSTRIAL MEASUREMENT ENVIRONMENT 3 Field Control Room Field Wiring SENSORS3 Terminology Sensor Linearization Sensor Classification Temperature Sensors Motion Sensors Strain Gages LOOPS AND ANALOG SIGNALS 11 Measurement Loop Configurations Analog Signals SIGNAL INTEGRITY 14 Sources of Error Ways to Preserve Signal Integrity DESIGN EXAMPLES 18 Servo Control Aluminum Smelting Grounded Thermocouples PRODUCT SELECTION GUIDE 21 ditioning preserves the quality of the meas- manufacturing process. They provide control OVERVIEW OF INDUSTRIAL urements available and allows the plant sys- over a physical or compositional characteris- MEASUREMENT tems to make best use of the control and data tic of the process. For example, the tempera- acquisition systems installed. Helping ture of a heat exchanger is an essential The need to measure and control the opera- Dataforth customers achieve good signal parameter for both process and safety rea- tion of machinery or process equipment is as conditioning is the goal of this handbook. sons. Flow measurements and control such as old as the Industrial Revolution. Plant instru- those illustrated by Figure 1 appear in almost mentation has now become the nerves and USES OF INDUSTRIAL every plant.