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CONTROL SYSTEMS: PROBLEMS, PRACTICES AND THE PROCESS.

Author(s) : HART F. O.

Type of article: Article

Summary

THE AUTHOR REVIEWS THE CHANGES THAT HAVE TAKEN PLACE IN CONTROL SYSTEMS OVER THE PAST FEW DECADES. THE CLUMSY ELECTRO-MECHANICAL POTENTIOMETER USED FORTY YEARS AGO FOR CRUDE PROPORTIONAL CONTROL HAS GRADUALLY BEEN CHANGED TO ELECTRONIC SYSTEMS A FRACTION OF THE SIZE GIVING FULL THREE-TERM CONTROL PLUS A NUMBER OF STAGED, LIMITING AND WARNING FUNCTIONS, AND ALSO HAVING THE ABILITY TO ACCEPT A DIAGNOSTIC TAPPING FOR READ-OUT OF ACTUAL PLANT OPERATION. OTHER ADVANTAGES HAVE BEEN IN THE STANDARDISING OF SIGNAL RANGES, USUALLY 0-10 V, FOR ALL TYPES OF SENSORS USED AND THE IMPROVED DESIGNOF ACTUATORS FOR VALVES AND DAMPERS WHICH ARE MATCHED WITHOUT FIELD ADJUSTMENT TO THE FINAL ELEMENTS THEY DRIVE. D.W.H.

Details

  • Original title: CONTROL SYSTEMS: PROBLEMS, PRACTICES AND THE PROCESS.
  • Record ID : 1988-1161
  • Languages: English
  • Source: AIRAH J. - vol. 41 - n. 5
  • Publication date: 1987
  • Document available for consultation in the library of the IIR headquarters only.

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