Territory Stories

Electronic Data Collection and Analysis System



Electronic Data Collection and Analysis System


Yin Foo, Des; Foley, Margaret


E-Publications; PublicationNT; E-Books; Report ; 39/1992




Made available via the Publications (Legal Deposit) Act 2004 (NT).





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Power and Water Authority

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Report ; 39/1992

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Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 57 of 192. 'rIle opera'tional problems encountered with this logger were tew and only associated with software anomalies. For example, recording at the highest available second) with the tour inputs active caused a disorientation. Apart from this, the disadwmtages are associated with its size and frequency (ie. 1 channel and time loggers I main useability. .tiii) Hincata Pressure Transducers. Two un vented pressure transducers, a 10m and a 20m, were initially purchased for testinq. During the course of the tests, both developed proble:ns and required servicing. The latter became inoperable and was replaced with a 20m vented transducer. The specific nature of the problems are discussed in section 4.1.2. Regardless that the number of transducers trial led is only a small statistical sample, their performance during this project have been unsatisfactory in terms of both reliability and accuracy oJ: measurement. In contrast, these problems have not so far been reported in similar transducers used for hydrographic rE!cording to date. The tests performed in both static and dynamic water level situations generally produced data outside specification (refer Tables 3.1, 3.2 and 3.3). For a number of repeated trials, a vari_ability in recorded data was observed. This variability also occurred between data generated by raising the t~ransducer up and lowering down to the same position. The differences are presumably caused by hysteresis effects. In addition to this, each transducer is prone to produce at random, a single anomalous point of any magnitude. This data point needs to be detected in the data set and eliminated during processing. 1'he 10m unvented transducer (10mm accuracy) produced maximum errors. of inexcess of 100mm {l%FS) in static water level tests and was ineffective during dynamic water level tests. This transducer however is considered disadvantaged by a response lag characteristic. The was subsequently disclaimed by the manufacturer. to be problem

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