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).
Power and Water Authority
Report ; 39/1992
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Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 62 of 192. loss of input settings (eg. timer logging interval r etc.) and operational parameters (eg. slope and offset data). In factr it is advised that the battery be disconnected during transit. All necessary data is retained on the EEPROM in addition to the logged data,. 1iii) Hindata Pressure Transducers. Notwithstanding the level of accuracy provided by some transducers, results of testing in pumped bores has indicated that the data obtained using the available logging systems is generally unsuitable without "smoothing". This data reflects not only water levels, but also the superimposed effects of extraneous oscil::.atory fo:cces. Tests conducted using helical rotor and submersible pumps have indicated that these effects may be detected under both scenarios. The above results are primarily attributed to microphonic responses which are detected by these transducers in addition to water pressure. In conjunction with the instantaneous sampling method of the trialled loggers, the data output will appea.r as a "noisy" drawdown trace. If development using this type of transducer is to be pursued, then further understanding a.s to the origin of the "noise" must be gained in order to eliminate or reduce it. Alternatively, tranEoucers which will detect water pressure only should be invest.igated (for example, capacitance probes). The particular methods of physical filtering already discussed in section 3 have not generally been successful. However, mathematical or electrical smoothing should be further examined. 1'he stated over considered to provide transducers. Tests is ranging capacity of three times an adequate safety margin for have not been conducted to the fully investigat.e this r hOl"ever, the accuracy at 150% over range has been indicated to be within 0.14% of full scale. 17he suitability of the cabling should be assessed in terms of its durability, unsupported length capacity and Ylork1l.bility. Testing for load and fatigue strength has not been conducted at this stage. An indication of the tensile