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 67 of 192. 4.2 Remote site Monitoring Systems The Wesdata logging system was selected as the preferred system to be trialled. A Cherryville logger was used for comparison purposes and as considered. 'rhis choice a possible alternative system to be was due to its availability and current utilis",tion in the field as a single channel logger. 4.2.1 Field Test Appraisal Ii) Wesdata Logging System. Transducers of Sm and 10m ranges vlere initially purchased with dedicated loggers. Neither perfOI"med satisfactorily ~n terms of reliability. Both units have been returned for repair on more than two occasions. S'~rvice reports ,vere not provided and hence a record of failure modes ~s unavailable. The history of hardware and software changes since the initial purchase lS considered to be inappropriate for equipment available for general retail"" Tests to determine logging accuracy and temperature effects were not conducted due to the unavailability of suitable testing equipment. A long term downhole test was attempted and aborted as a result of failure of the logger. The possibilit.y of deterioration of logger performance and battery life, particularly in Top End groundwaters which are typically of 32C t.emperature, is of concern and needs to be affirmed. other issues including long term drift in calibration, a:J.d the performance, efficiency and resistance to moist.ure ingression of the v"ented cable need to be addressed. 1'he standard tests were performed to obtain a measure of accuracy of the transducers (see also section 3). The static water level b,st on the Sm transducer indicated the maximum error was up to 46mm. A 10m transducer initially used, I"as afflicted with an intermittent lagged response problem I"hich vIas reflected in its performance level. Its replacement produced a maximum error of 38mm in the static test and in