(19)

(11)

EP 1 177 454 A1

(12)

(43) Date of publication: 06.02.2002 Bulletin 2002/06 (21) Application number: 00927503.3 (22) Date of filing: 05.05.2000

(51) International Patent Classification (IPC)7: G01R 31/36 (86) International application number: PCT/GB0001/714 (87) International publication number: WO 0068/701 (16.11.2000 Gazette 2000/46)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 10.05.1999 GB 9910713 (71) Applicant: Act Meters Limited Rainford, Merseyside WA11 8HD (GB)	(72) Inventors: JONES, Adrian BowdenCheshire WA14 2JL (GB) WALTON, Nigel WistastonCheshire CW2 6QW (GB) (74) Representative: Lyons, Andrew John et al ROYSTONS, Tower Building, Water Street Liverpool L3 1BA, Merseyside Liverpool L3 1BA, Merseyside (GB)