(19)
(11) EP 0 322 204 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.01.1991 Bulletin 1991/02

(43) Date of publication A2:
28.06.1989 Bulletin 1989/26

(21) Application number: 88312101.4

(22) Date of filing: 21.12.1988
(51) International Patent Classification (IPC)4: G08B 21/00, G08B 29/16, G08B 25/10
(84) Designated Contracting States:
AT BE CH DE ES FR GR IT LI LU NL SE

(30) Priority: 22.12.1987 GB 8729881

(71) Applicant: ZONE TECHNOLOGY LIMITED
Stevenage Hertfordshire SG1 2EQ (GB)

(72) Inventors:
  • Theakstone, Malcolm John Meikle
    Letchworth Hertfordshire SG6 3HF (GB)
  • Hosgood, John Charles Travers
    Hoddesdon Hertfordshire EN11 9AF (GB)
  • Smith, Clive James
    Shefford Bedfordshire SG15 5JH (GB)
  • Mason, Albert
    Stevenage Hertfordshire SG1 5SQ (GB)

(74) Representative: Thomson, Roger Bruce et al
POLLAK MERCER & TENCH Eastcheap House Central Approach
Letchworth Hertfordshire SG6 3DS
Letchworth Hertfordshire SG6 3DS (GB)


(56) References cited: : 
   
       


    (54) Detector unit and system


    (57) A detector unit, especially for a "child minding" system in hotels, leisure complexes, etc., is a portable unit (12,14) comprising means to sense movement (24a,24b) and noise (22) within a zone being monitored. An alarm signal can also be generated manually from the unit by push-button means (26). The unit will only trigger a positive alert signal if detected movement and/or noise does not conform to preset tolerances or patterns. A plurality of units are linked to a central control which is itself connected to a plurality of remote display units on each of which a characteristic alert signal is displayed.







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