(19)

(11)

EP 0 835 427 A2

(12)

(43) Date of publication: 15.04.1998 Bulletin 1998/16 (21) Application number: 95936058.0 (22) Date of filing: 23.10.1995

(51) International Patent Classification (IPC):  G01F 1/ 66( . ) G01F 15/ 08( . ) G01F 1/ 74( . ) G01F 15/ 12( . ) (86) International application number: PCT/IB1995/001023 (87) International publication number: WO 1996/013701 (09.05.1996 Gazette 1996/21)

(84) Designated Contracting States: AT BE DE DK ES FR GB GR IE IT LU NL PT SE (30) Priority: 21.10.1994 US 19940327301 (71) Applicant: DANIEL INDUSTRIES, INC., Houston, TX 77224-9097 (US)	(72) Inventors: FREUND, William, Jr. Houston, TX 77224 (US) ALLEN, Charles, R. Houston, TX 77224 (US) (74) Representative: Frankland, Nigel Howard  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 80801 München 80801 München (DE)