ATE25885T1 - CIRCUIT ARRANGEMENT FOR INTERFERENCE SIGNAL SUPPRESSION IN OPTICAL SMOKE DETECTORS. - Google Patents
CIRCUIT ARRANGEMENT FOR INTERFERENCE SIGNAL SUPPRESSION IN OPTICAL SMOKE DETECTORS.Info
- Publication number
- ATE25885T1 ATE25885T1 AT84103961T AT84103961T ATE25885T1 AT E25885 T1 ATE25885 T1 AT E25885T1 AT 84103961 T AT84103961 T AT 84103961T AT 84103961 T AT84103961 T AT 84103961T AT E25885 T1 ATE25885 T1 AT E25885T1
- Authority
- AT
- Austria
- Prior art keywords
- alarm
- measured value
- diode
- led
- interrogation
- Prior art date
Links
Classifications
-
- 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
- G08B29/18—Prevention or correction of operating errors
- G08B29/20—Calibration, including self-calibrating arrangements
- G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
- G08B26/005—Alarm systems in which substations are interrogated in succession by a central station with substations connected in series, e.g. cascade
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1. A circuit arrangement in a fire alarm system, for suppressing interference signals in optical smoke detectors (RM) with a luminescence diode (LED) which transmits in pulsed fashion and with a photo-diode (FD) which receives diffused light from the luminescence diode (LED), where, during cyclic interrogation from central control (Z), the individual alarms (Mi) of an alarm line (ML) are connected in cascade to the alarm line (ML) in a predetermined sequence with a time delay and where the delay time until the connection of the following alarm corresponds to the analogue alarm measured value in question, and in the central control the alarm measured value and the alarm address are determined from the time of the connection, characterised in that the optical smoke detector (RM) comprises a voltage supply device (SPV) ; a transmitting circuit (MMV1) driven by the alarm interrogation (UAB) and serves to produce transmitted pulses (US) for the luminescence diode (LED), where the duration (TP) of the transmitted pulses is substantially shorter than the interrogation duration of an alarm ; an instantaneous value store (SHS), connected to the output of the photo-diode (FD) via the amplifier (VER), driven by the transmitting circuit (MMV1) to temporarily store the analogue alarm measured value ; and a voltage/time converter (VTC) connected to the output of the instantaneous value store, which connects the following alarm (Mi) to the alarm line (ML) via a switch-through transistor (TR) with a delay in accordance with the alarm measured value.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833313137 DE3313137A1 (en) | 1983-04-12 | 1983-04-12 | CIRCUIT ARRANGEMENT FOR CANCELING NOISE IN OPTICAL SMOKE DETECTORS |
EP84103961A EP0125485B1 (en) | 1983-04-12 | 1984-04-09 | Signal suppression circuit for optical smoke detectors |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE25885T1 true ATE25885T1 (en) | 1987-03-15 |
Family
ID=6196107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT84103961T ATE25885T1 (en) | 1983-04-12 | 1984-04-09 | CIRCUIT ARRANGEMENT FOR INTERFERENCE SIGNAL SUPPRESSION IN OPTICAL SMOKE DETECTORS. |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0125485B1 (en) |
AT (1) | ATE25885T1 (en) |
DE (2) | DE3313137A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE52632T1 (en) * | 1985-07-29 | 1990-05-15 | Siemens Ag | METHOD AND DEVICE FOR OPERATIONAL MONITORING OF OPTICAL SMOKE DETECTORS. |
ATE101445T1 (en) * | 1988-10-06 | 1994-02-15 | Siemens Ag | PROCEDURE FOR ENERGY-SAVING OPERATION OF SECURITY DETECTORS IN A SECURITY DETECTION SYSTEM. |
EP0362797B2 (en) * | 1988-10-06 | 2000-05-17 | Siemens Aktiengesellschaft | Method for the energy-saving operation of risk detectors in a risk detection arrangement |
ATE102374T1 (en) * | 1989-09-19 | 1994-03-15 | Siemens Ag | FIRE ALARM SYSTEM WITH A COMBINATION DETECTOR. |
ES2061859T3 (en) * | 1989-09-19 | 1994-12-16 | Siemens Ag | PROCEDURE AND DEVICE FOR COMPENSATION OF AIR MOISTURE IN AN OPTICAL SMOKE ALARM. |
EP3457369B1 (en) | 2017-09-19 | 2021-05-19 | Elmos Semiconductor SE | Circuit arrangement for a smoke sensor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2214189B1 (en) * | 1973-01-16 | 1977-07-22 | Silec Liaisons Elec | |
DE2533382C2 (en) * | 1975-07-25 | 1980-07-03 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Method and device for the transmission of measured values in a fire alarm system |
DE2638068C3 (en) * | 1976-08-24 | 1986-11-13 | Siemens AG, 1000 Berlin und 8000 München | Fire alarm system with several detectors that can be operated via a message loop |
US4149162A (en) * | 1977-06-20 | 1979-04-10 | American District Telegraph Company | Battery discriminator circuit for smoke detectors |
-
1983
- 1983-04-12 DE DE19833313137 patent/DE3313137A1/en not_active Withdrawn
-
1984
- 1984-04-09 AT AT84103961T patent/ATE25885T1/en not_active IP Right Cessation
- 1984-04-09 DE DE8484103961T patent/DE3462637D1/en not_active Expired
- 1984-04-09 EP EP84103961A patent/EP0125485B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3313137A1 (en) | 1984-10-18 |
EP0125485A1 (en) | 1984-11-21 |
EP0125485B1 (en) | 1987-03-11 |
DE3462637D1 (en) | 1987-04-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
REN | Ceased due to non-payment of the annual fee |