(19)

(11)

EP 0 227 785 A1

(12)

(43) Date of publication: 08.07.1987 Bulletin 1987/28 (21) Application number: 86904321.0 (22) Date of filing: 03.07.1986

(51) International Patent Classification (IPC):  G01N 27/ 04( . ) G01N 33/ 38( . ) (86) International application number: PCT/GB1986/000438 (87) International publication number: WO 1987/000284 (15.01.1987 Gazette 1987/01)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 03.07.1985 GB 19850016822 (71) Applicant: MICROSPAN PROCESS CONTROLS LIMITED Maidenhead, Berkshire SL6 8BR (GB)	(72) Inventor: KAY, Joseph, Brian Farnham Common Buckinghamshire (GB)