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 113 of 192. 50 Flowmeter Calibration Many users of flowmeters treat their specifications with suspicion. Furthermore. especially "r!th mechanICal meters. wear of movmg parts may effect uccuruco,i. Hence. as mentioned above. je is strongly suggested that the Olillee place and manometer be retalned on any system PAWA use for discharge of pumped water. This will allow a continuous check to be made on flowmeter performance and to monitor any changes that it may undergo from pump test to pump test. If PA\VA do not have their own flowmeter calibration facilities it may be of lnterest to them to know that the ACTFR possess calibration facillties for flow rates of up to nearly 100 lis. Qomputers A data logger needs to download its data into a computer. Most environmental loggers are battery powered and consume very Uttle current so that they can stay operational for long periods. Many have the capacity to withhold the contents of their memory even after the batteries have failed either because data is stored In EPROM or in lith urn battery backed R~M. Hence loggers can be brought back to the office for downloadlng after their deployment is complete. PA\VA personnel have indicated that they would like to process at least some of their pump test data 1n the field. Hence a field computer will be necessary both for logger (or field termlIml) dowp..Joading and for data plotUng and processlng. For field dmvnloading purposes it would be best if the computer were battery-powered. Some form of laptop is the ohvious chOice; these normally have lnteITJal batteries which will keep them going for about five hours. For processing. a computer of at least XT power with a hard dJsk would be adviSable. If 240V power is available at the campsite whenever this computer is likely to be used. thiS machine does not need to be a laptop. it should be noted that power line conditioning may be required to nJtcr out spikes on the line feeding the computer from the generatDr. A suitable unit is the Arlee, CUS 80250 costing $457.25 (wholesale) though there are many other similar devices around. A savlnl~s in cost could be achieved if the processing and downloading computer were one and the same; laptops are available with hard disks and XT (even An power. However as r have left the task of costing and assessing computer requirements to the PAW A, r do not know how great is the price advantage of a Single Al laptop with hard disk over a PC single l1oppy-dlsk laptop plus an XT or AT transportable computer with hard disk. If the price difference ].<; not too great then I would lean toward haVing the two computers; if the laptop