GB2304222B - A security circuit and a security sensor - Google Patents

A security circuit and a security sensor

Info

Publication number
GB2304222B
GB2304222B GB9616568A GB9616568A GB2304222B GB 2304222 B GB2304222 B GB 2304222B GB 9616568 A GB9616568 A GB 9616568A GB 9616568 A GB9616568 A GB 9616568A GB 2304222 B GB2304222 B GB 2304222B
Authority
GB
United Kingdom
Prior art keywords
security
circuit
sensor
security sensor
security circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB9616568A
Other versions
GB9616568D0 (en
GB2304222A (en
Inventor
Francis Joseph Anderson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CETSA Ltd
Original Assignee
CETSA Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CETSA Ltd filed Critical CETSA Ltd
Publication of GB9616568D0 publication Critical patent/GB9616568D0/en
Publication of GB2304222A publication Critical patent/GB2304222A/en
Application granted granted Critical
Publication of GB2304222B publication Critical patent/GB2304222B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
GB9616568A 1995-08-11 1996-08-07 A security circuit and a security sensor Expired - Fee Related GB2304222B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IES950604 1995-08-11

Publications (3)

Publication Number Publication Date
GB9616568D0 GB9616568D0 (en) 1996-09-25
GB2304222A GB2304222A (en) 1997-03-12
GB2304222B true GB2304222B (en) 1999-08-04

Family

ID=46799389

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9616568A Expired - Fee Related GB2304222B (en) 1995-08-11 1996-08-07 A security circuit and a security sensor

Country Status (2)

Country Link
GB (1) GB2304222B (en)
IE (1) IES71512B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7004784B2 (en) 2004-02-26 2006-02-28 Robert Bosch Gmbh Tamper detection for security system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2069205A (en) * 1980-02-06 1981-08-19 Maxted C W A device for use in an electrical circuit and comprising two separable parts
GB2095880A (en) * 1981-03-30 1982-10-06 Electronic Alarms Ltd Fire alarm circuits
GB2134680A (en) * 1983-02-02 1984-08-15 Sound Diffusion Plc Monitored line alarm systems
US5440293A (en) * 1992-05-29 1995-08-08 Pittway Corporation Detector supervision apparatus and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2069205A (en) * 1980-02-06 1981-08-19 Maxted C W A device for use in an electrical circuit and comprising two separable parts
GB2095880A (en) * 1981-03-30 1982-10-06 Electronic Alarms Ltd Fire alarm circuits
GB2134680A (en) * 1983-02-02 1984-08-15 Sound Diffusion Plc Monitored line alarm systems
US5440293A (en) * 1992-05-29 1995-08-08 Pittway Corporation Detector supervision apparatus and method

Also Published As

Publication number Publication date
IES71512B2 (en) 1997-02-12
GB9616568D0 (en) 1996-09-25
GB2304222A (en) 1997-03-12

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090807