Detecting changes in the condition of process instruments

Author

Echendu, J. E Amadi ; Zhu, Hengjun

Author_Institution

Sch. of Eng., Greenwich Univ., London, UK

Volume

43

Issue

2

fYear

1994

fDate

4/1/1994 12:00:00 AM

Firstpage

355

Lastpage

358

Abstract

By custom, the output from an instrument is a signal representing a measure of the process variable, and instrument performance is usually specified in terms of accuracy, linearity and rangeability. The process operator typically uses the specified performance criteria to assess the operational condition of the instrument based on the premise that degradation in performance essentially reflects malfunction on the part of the instrument. Current developments in intelligent measurement systems place emphasis on local sensor validation schemes to incorporate systematic means for detecting and isolating instrument effects from plant effects. This paper describes a method for detecting and isolating changes in a flow-measuring system using wide-band and unconditioned signals taken directly from the flow-sensing element

Keywords

flow measurement; flowmeters; intelligent sensors; measurement theory; signal detection; signal processing; statistical analysis; accuracy; flow-measuring system; instrument effects; intelligent measurement; linearity; local sensor validation; performance criteria; process instruments; rangeability; smart sensor; unconditioned signals; wide-band signals; Current measurement; Frequency; Instruments; Intelligent sensors; Intelligent systems; Sensor systems; Signal processing; Transducers; Transmitters; Wideband;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.293447

Filename

293447