Device for automatically controlling an air maintenance system

(19)

(11)

EP 1 136 762 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.11.2002 Bulletin 2002/45

(43)	Date of publication A2:
	26.09.2001 Bulletin 2001/39

(21)	Application number: 01302697.6

(22)	Date of filing: 23.03.2001

(51)	International Patent Classification (IPC)⁷: F24F 11/00

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

23.03.2000 GB 0007091

(71)	Applicant: Kleenair Maintenance Services Limited
	Christchurch, Dorset BH23 3TG (GB)

(72)	Inventor:
	Withrington, Derek M. Christchurch, Dorset BH23 8JZ (GB)

(74)	Representative: Cross, Rupert Edward Blount et al
	BOULT WADE TENNANT, Verulam Gardens 70 Gray's Inn Road London WC1X 8BT London WC1X 8BT (GB)

(54)	Device for automatically controlling an air maintenance system

(57) A device (10) for automatically controlling an air maintenance system (12) is disclosed. The device uses a Passive Infra-Red (PIR) detector (14) to count the number of movements within an enclosed space during a specified time period. Readings from a temperature sensor (16) may also be included. A processor (18) then estimates the number of people within the enclosed space and thereby activates the air maintenance system (12) at a suitable activation level. Preferably, a PIR detector (14) with no latching-on period is provided. Communication between the processor (18) and the air maintenance system is preferably by way of a radio transceiver (32).

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