(19)

(11)

EP 0 460 046 A1

(12)

(43) Date of publication: 11.12.1991 Bulletin 1991/50 (21) Application number: 90903882.0 (22) Date of filing: 23.02.1990

(51) International Patent Classification (IPC):  G01F 11/ 24( . ) G01F 11/ 04( . ) (86) International application number: PCT/GB1990/000288 (87) International publication number: WO 1990/010198 (07.09.1990 Gazette 1990/21)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 24.02.1989 GB 19890004305 (71) Applicant: LIQUID CONTROL INTERNATIONAL COMPANY Willard, OH 44890 (US)	(72) Inventors: PENN, Laurence, Richard Liquid Control 446 Lakeshore Drive Willard, OH 44890 (US) ANDERSON, Steven, Roger Edina, MN 44134 (US) (74) Representative: Frankland, Nigel Howard  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)