DocumentCode :
1039245
Title :
Detecting the blockage of the sensing lines of a differential-pressure flow sensor in a dynamic process using wavelet transform techniques
Author :
Zhang, Jian Qiu ; Yan, Yong
Author_Institution :
Dept. of Electron. Eng., Fudan Univ., Shanghai
Volume :
55
Issue :
4
fYear :
2006
Firstpage :
1443
Lastpage :
1448
Abstract :
The blockage of the sensing lines of a differentialpressure (DP) flow sensor has been found to be the main cause of a malfunction of a flow measurement system in many industrial applications. In this paper, the blockage of the sensing lines under dynamic process conditions is investigated using wavelet transform techniques. The results obtained show that the blockage in a fast changing process is only detectable when the severity of the blockage is over 90%. This outcome differs from that when the sensor operates under a slow varying process. The main reason resulting in the discrepancy between slow and fast varying processes is that a process with high flow rates produces more noise energy in the output of the sensor than a process with low flow rates does. This means that the noise energy generated by the blockage of the sensor under low flow-rate conditions is indistinguishable with that from the output of the sensor working under the sensor normal operating conditions but a process with high flow rates
Keywords :
flow sensors; pressure sensors; wavelet transforms; differential-pressure flow sensor; flow measurement system; flow-rate condition; sensing lines; wavelet transform; Fault detection; Fluid flow measurement; Mechanical sensors; Noise generators; Polynomials; Process design; Sensor systems and applications; Thermal sensors; Transducers; Wavelet transforms; Differential-pressure (DP) transducer; fault detection; flow sensor; sensing-line blockage; wavelet transform;
fLanguage :
English
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9456
Type :
jour
DOI :
10.1109/TIM.2006.876386
Filename :
1658402
Link To Document :
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