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(11)

EP 0 710 351 A1

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(43) Date of publication: 08.05.1996 Bulletin 1996/19 (21) Application number: 94922792.0 (22) Date of filing: 20.07.1994

(51) International Patent Classification (IPC):  F16L 55/ 26( . ) G01M 3/ 00( . ) G01N 29/ 265( . ) H04N 7/ 18( . ) G01C 7/ 06( . ) G01N 29/ 06( . ) G01N 29/ 44( . ) (86) International application number: PCT/AU1994/000409 (87) International publication number: WO 1995/003526 (02.02.1995 Gazette 1995/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: LT SI (30) Priority: 20.07.1993 AU 1993PM00024 (71) Applicants: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Campbell, Australian Capital Territory 2601 (AU) MELBOURNE WATER CORPORATION Melbourne, VIC 3000 (AU) Jensen, Murray John Fairfield 3078, Victoria (AU)

(72) Inventors: MACINTYRE, Ian, Barry Rosanna, VIC 3084 (AU) KEARNEY, Patrick, Dale Mont Albert, VIC 3052 (AU) FONG, Jensen, Lok, Chueng Templestowe, VIC 3106 (AU) ROBERTS, Michael, Vaughan Balwyn, VIC 3103 (AU) ROGERS, Kevin, John Blackburn, VIC 3130 (AU) SHARPE, Ron Bentleigh, VIC 3204 (AU) GIBERT, Jacek Hampton, VIC 3188 (AU) MASHFORD, John, Sebastian Northcote, VIC 3070 (AU) PARKER, Robert, Andrew Glen Huntly, VIC 3163 (AU) RAHILLY, Michael, Albert Cheltenham, VIC 3192 (AU) JENSEN, Murray John Fairfield 3078, Victoria (AU) (74) Representative: Brunner, Michael John  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)