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 18 of 192. Cherryville Logger This logger IlTaS developed by S. D. S. logger for "luviometers and digital as a single channel shaft encoders in particular. A 0-20mA analogue input may be fitted as an option at the time of manufacture. to be used with 16 bit resolution. This will allow 1 channel The unit is an ABS enclosure housing a standard EPROM, a battery and solid state hardware. The EPROH holds 32K or optionally 64K RAM, and will facilitate 1 second recording resolution. B.'>ttery life is claimed to be in excess of six years of normal usage. Communication is via a 9-pin serial connector undeT the lid, and input via Cannon military specification connectors externally. to IP67 (waterproof) if required. The unit may be sealed Wl~sdata Data Recorders and Pressure Sensors The Wesdata recorders used were a 390 series and the pressure sensors, 983 and 984 series. The logging unit comprises a single channel data recorder directly coupled to a pressure sensor (see Plates 3 and 4). Both components reside downhole when in operation. The recorder is housed in a 300mm long polyurethccne tube of 30mm diameter. At the couplings, the outer diameter is increased to 40mm. This section of the uni t <'llso houses 4xAA recomffiEmded) as well as lithium battery retains size the the batteries (extra heavy solid state componentry. non-volatile software and duty A is 1 . d t c_a.l.me 0 reduced if havl"! a 5 year life span. the main batteries have been This may be severely fully expended and it is required to maintain logging procedure. has 32k of available memory. The data recorder The pressure sensor tube. A screwed coupling componEmt to the recorder. is housed in a 30mm polyurethane and 2.5mm audio plug connects this The mode of operation is based on a strain gauge diaphragm whose resistive element is a monolit.hic silicon piezoresistor. Venting of the system A temperature allows for atmospheric pressure compensation. sensor is also installed to facilitate thermal compensation