(19)

(11)

EP 2 583 065 A1

(12)

(43) Date of publication: 24.04.2013 Bulletin 2013/17 (21) Application number: 11735907.5 (22) Date of filing: 21.06.2011

(51) International Patent Classification (IPC):  G01D 11/24(2006.01) G01D 11/30(2006.01) (86) International application number: PCT/GB2011/051152 (87) International publication number: WO 2011/161441 (29.12.2011 Gazette 2011/52)

(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 (30) Priority: 21.06.2010 GB 201010360 (71) Applicant: Protec Fire Detection plc Nelson, Lancashire BB9 6RT (GB)	(72) Inventors: FIRTH, David Michael Grenoside Sheffield S35 8RY (GB) OLDLAND, Robert Patrick Colne Lancashire BB8 9QJ (GB) (74) Representative: Davies, Robert Ean  Appleyard Lees 15 Clare Road Halifax Yorkshire HX1 2HY Halifax Yorkshire HX1 2HY (GB)