(19)

(11)

EP 0 509 045 A1

(12)

(43) Date of publication: 21.10.1992 Bulletin 1992/43 (21) Application number: 91902809.0 (22) Date of filing: 20.12.1990

(51) International Patent Classification (IPC):  G01N 15/ 02( . ) (86) International application number: PCT/SE1990/000858 (87) International publication number: WO 1991/010123 (11.07.1991 Gazette 1991/15)

(84) Designated Contracting States: DE DK ES FR GB IT (30) Priority: 05.01.1990 SE 19900000039 (71) Applicant: ABB STAL AB S-612 20 Finspang (SE)	(72) Inventors: LEONARDSSON, Lars S-116 49 Stockholm (SE) LÄNDIN, Ake S-602 23 Norrköping (SE) PARASNIS, Amalendu S-722 22 Västeras (SE) (74) Representative: Erdal, Magne  ABB Corporate Research S-721 78 Västeras S-721 78 Västeras (SE)