(19)

(11)

EP 3 701 228 A1

(12)

(43) Date of publication: 02.09.2020 Bulletin 2020/36 (21) Application number: 18737150.5 (22) Date of filing: 09.04.2018

(51) International Patent Classification (IPC):  G01D 11/30(2006.01) (86) International application number: PCT/EP2018/059035 (87) International publication number: WO 2018/185338 (11.10.2018 Gazette 2018/41)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 06.06.2017 GB 201709009 (71) Applicant: WFS Technologies Ltd Livingston, Lothian EH54 5DW (GB)	(72) Inventors: HYLAND, Brendan Peter Livingston, Lothian EH54 5DW (GB) MCLEAN, Grant Livingston, Lothian EH54 5DW (GB)