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 50 of 192. measUJ~ement, depending on the flow rate. less than 10rrun. The mean error was 'Phe "Datmc.n" screen on Figure 3.11 shows the logged and manual readings over a 14 minute period when the flow rate was varied from 1 t;o 1.5 l/s. Variations in logged data of up to 20m)1l were recorded during periods when the pump rate was nominally constant. These variations are caused primar ily visible in the by pump/motor piezometer tube and are vibration of the discharge at ttw sensor will also tube. cause However, entrapment of air fluctuation and precautions should be taken to bleed the system of air. 220.127.116.11 Comments A.t this stage, the flow monitoring system is usefUl as a check on unattended pump performance. However the system's response to daily temperature changes has not been ascertained. Some users report up to a 5% change in calibration for similar units in use in the Darwin water supply system. After a housing has been constructed for the unit, its' performance over long periods of pumping should be re-tested. Additional power supply is required to operate this unit when used in conjunction with a 12v logging system. 3.3.6 Barometric Monitoring 18.104.22.168 Results I-;'here unvented transducers are used the barometric pressure over the full course of logging period must be recorded. Unvented transducers measure total pressure rather than relative pressure to reference (atmosphere). Hence varil:lt.ion in the reference pressure must be ascertained. Barometric data thereby enables determination of water level variation given the changes in pressure head over the period of the pump test. The procedure for this is outlined in Appendix D.
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