EP0058824B1 - Apparatus for maintaining the alarm condition of a gas detector - Google Patents
Apparatus for maintaining the alarm condition of a gas detector Download PDFInfo
- Publication number
- EP0058824B1 EP0058824B1 EP19820100437 EP82100437A EP0058824B1 EP 0058824 B1 EP0058824 B1 EP 0058824B1 EP 19820100437 EP19820100437 EP 19820100437 EP 82100437 A EP82100437 A EP 82100437A EP 0058824 B1 EP0058824 B1 EP 0058824B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fault
- alarm
- channel
- amplifier
- maintaining
- 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
Links
- 239000007789 gas Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 108091006146 Channels Proteins 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
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
Definitions
- the invention relates to a circuit arrangement according to the preamble of the claim.
- the transmitter is connected to an alarm and to a fault channel, and in the event of a device-internal fault, the fault signal is passed via a fault amplifier which blocks the alarm channel and at the same time switches it off a multivibrator formed interference channel activated so that an intermittent sound is emitted by the alarm. If a gas alarm case occurred shortly before the device-internal fault or an alarm case and a fault coincide, the alarm channel is blocked or can never be displayed by blocking the alarm channel.
- the invention has for its object to provide a circuit arrangement in which the gas alarm condition is maintained in the event of a gas alarm device malfunction.
- the circuit arrangement shown as a block diagram for maintaining the alarm state of a gas concentration value measured by a sensor A of the gas warning device X consists of signal amplifiers C, switching amplifier D and memory logic E connected in series between the sensor A and the alarm relay B.
- a fault amplifier F which is connected in parallel with the switching elements mentioned above and which reports the presence of a fault via a fault relay G in the event of a fault.
- the switching amplifier D can assume an output switching state which is not derived from a real measured value and which nevertheless changes an existing switching state as a result of a measuring signal and thus indicates an incorrect switching state.
- the switching amplifier D is followed by a memory logic E which, in the event of a fault, keeps the signals from the transmitter A away from the alarm relay B.
- the memory logic E is controlled by a control command derived from the interference amplifier F by connecting the output signals of the switching amplifier D to the output of the memory logic E when the input signals are derived from real measurement signals.
- the input signals of the memory logic E are not switched through to the output if interference signals are present.
- the output signal of the memory logic E before the malfunction occurs is retained.
- a fault relay G is switched by the fault amplifier F.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Emergency Alarm Devices (AREA)
Description
Die Erfindung betrifft eine Schaltungsanordnung nach dem Oberbegriff des Patentanspruchs.The invention relates to a circuit arrangement according to the preamble of the claim.
Bei einer bekannten Schaltungsanordnung dieser Art (US-A-4 219 806) ist der Meßwertgeber an einen Alarm- und an einen Störungskanal geschaltet, wobei im Falle einer geräteinternen Störung das Störsignal über einen Störverstärker geleitet wird, der den Alarmkanal sperrt und gleichzeitig den aus einem Multivibrator gebildeten Störungskanal aktiviert, so daß vom Alarmgeber ein intermittierender Ton abgegeben wird. Falls kurz vor der geräteinternen Störung ein Gasalarmfall vorlag oder ein Alarmfall und eine Störung zusammenfallen, wird durch die Sperrung des Alarmkanals der Alarmfall weggeschaltet bzw. niemals angezeigt werden können.In a known circuit arrangement of this type (US-A-4 219 806), the transmitter is connected to an alarm and to a fault channel, and in the event of a device-internal fault, the fault signal is passed via a fault amplifier which blocks the alarm channel and at the same time switches it off a multivibrator formed interference channel activated so that an intermittent sound is emitted by the alarm. If a gas alarm case occurred shortly before the device-internal fault or an alarm case and a fault coincide, the alarm channel is blocked or can never be displayed by blocking the alarm channel.
Der Erfindung liegt die Aufgabe zugrunde, eine Schaltungsanordnung zu schaffen, bei der im geräteinternen Störungsfall eines Gaswarngerätes der Gasalarmzustand beibehalten wird.The invention has for its object to provide a circuit arrangement in which the gas alarm condition is maintained in the event of a gas alarm device malfunction.
Diese Aufgabe wird erfindungsgemäß gelöst, wie im Kennzeichen des Patentanspruchs angegeben ist.This object is achieved according to the invention, as indicated in the characterizing part of the patent claim.
Auf diese Weise wird vorteilhaft erreicht, daß beim Auftreten einer Störung ein vorhandener Alarmzustand gespeichert bzw. angezeigt wird und nicht verloren geht.In this way it is advantageously achieved that an existing alarm state is saved or displayed when a fault occurs and is not lost.
In der einzigen Figur der Zeichnung ist die Schaltungsanordnung als stark vereinfachtes Blockschaltbild des erfindungsgemäßen Gaswarngerätes dargestellt.In the single figure of the drawing, the circuit arrangement is shown as a greatly simplified block diagram of the gas warning device according to the invention.
Wie aus der Figur ersichtlich ist, besteht die als Blockschaltbild dargestellte Schaltungsanordnung zur Erhaltung des Alarmzustandes eines von einem Meßwertgeber A des Gaswarngerätes X gemessenen Gaskonzentrationswertes aus zwischen dem Meßwertgeber A und dem Alarmrelais B in Reihe geschalteten Signalverstärker C, Schaltverstärker D und Speicherlogik E. Zur Überwachung des Meßwertgebers A dient ein zu den vorstehend genannten Schaltelementen parallel geschalteter Störungsverstärker F, der über ein Störungsrelais G im Störungsfall das Vorliegen einer Störung meldet.As can be seen from the figure, the circuit arrangement shown as a block diagram for maintaining the alarm state of a gas concentration value measured by a sensor A of the gas warning device X consists of signal amplifiers C, switching amplifier D and memory logic E connected in series between the sensor A and the alarm relay B. For monitoring of the transmitter A is a fault amplifier F which is connected in parallel with the switching elements mentioned above and which reports the presence of a fault via a fault relay G in the event of a fault.
Nachfolgend wird die Funktion der Schaltungsanordnung beschrieben:
- Das vom Meßwertgeber A kommende Meßsignal wird zur Weiterverarbeitung von dem Signalverstärker C verstärkt und auf den Schaltverstärker D gegeben. An einem Grenzwertpotentiometer (in der Zeichnung nicht dargestellt) wird der der Alarmkonzentration des brennbaren Gases entsprechende Spannungswert des Meßsignals eingestellt. Der Ausgangszustand des Schaltverstärkers D richtet sich nach dem Spannungswert des Meßsignals, und zwar je nach dem, ob der Wert über oder unter dem mit dem Grenzwertpotentiometer eingestellten Spannungswert liegt, ist der Ausgangszustand L (Alarm) oder O (kein Alarm).
- The measurement signal coming from sensor A is amplified by signal amplifier C for further processing and passed to switching amplifier D. The voltage value of the measurement signal corresponding to the alarm concentration of the combustible gas is set on a limit potentiometer (not shown in the drawing). The output state of the switching amplifier D depends on the voltage value of the measurement signal, depending on whether the value is above or below the voltage value set with the limit potentiometer, the output state is L (alarm) or O (no alarm).
Bei Störungen des Meßwertgebers A können nun Meßsignale entstehen, die von normalen Meßsignalen nicht zu unterscheiden sind. Das hat zur Folge, daß der Schaltverstärker D einen Ausgangs-Schaltzustand annehmen kann, der nicht von einem echten Meßwert abgeleitet ist und der dennoch als Folge eines Meßsignals einen bestehenden Schaltzustand verändert und somit einen falschen Schaltzustand angibt. Um dies zu vermeiden, ist dem Schaltverstärker D eine Speicherlogik E nachgeschaltet, die im Falle einer Störung die vom Meßwertgeber A ausgehenden Signale von dem Alarmrelais B fernhält. Die Speicherlogik E wird von einem vom Störungsverstärker F abgeleiteten Steuerbefehl gesteuert, indem die Ausgangssignale des Schaltverstärkers D an den Ausgang der Speicherlogik E durchgeschaltet werden, wenn die Eingangssignale von echten Meßsignalen abgeleitet sind. Die Eingangssignale der Speicherlogik E werden nicht an den Ausgang durchgeschaltet, wenn Störsignale vorhanden sind. Das vor dem Eintreten der Störung vorhandene Ausgangssignal er Speicherlogik E bleibt erhalten. Im Störungsfall am Meßwertgeber A wird vom Störungsverstärker F ein Störungsrelais G geschaltet.In the event of malfunctions in transmitter A, measurement signals can now be produced which cannot be distinguished from normal measurement signals. The result of this is that the switching amplifier D can assume an output switching state which is not derived from a real measured value and which nevertheless changes an existing switching state as a result of a measuring signal and thus indicates an incorrect switching state. In order to avoid this, the switching amplifier D is followed by a memory logic E which, in the event of a fault, keeps the signals from the transmitter A away from the alarm relay B. The memory logic E is controlled by a control command derived from the interference amplifier F by connecting the output signals of the switching amplifier D to the output of the memory logic E when the input signals are derived from real measurement signals. The input signals of the memory logic E are not switched through to the output if interference signals are present. The output signal of the memory logic E before the malfunction occurs is retained. In the event of a fault on sensor A, a fault relay G is switched by the fault amplifier F.
Claims (1)
characterised in that
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813107830 DE3107830A1 (en) | 1981-02-25 | 1981-02-25 | METHOD AND ARRANGEMENT FOR MAINTAINING THE ALARM OF A GAS DETECTOR |
| DE3107830 | 1981-02-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0058824A2 EP0058824A2 (en) | 1982-09-01 |
| EP0058824A3 EP0058824A3 (en) | 1983-07-20 |
| EP0058824B1 true EP0058824B1 (en) | 1986-04-30 |
Family
ID=6126120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19820100437 Expired EP0058824B1 (en) | 1981-02-25 | 1982-01-22 | Apparatus for maintaining the alarm condition of a gas detector |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0058824B1 (en) |
| DE (1) | DE3107830A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4422859A (en) * | 1982-05-24 | 1983-12-27 | Consolidated Technology Corporation | Apparatus and method for safely purifying hydrogen gas |
| EP0121048B1 (en) * | 1983-03-04 | 1987-05-06 | Cerberus Ag | Circuit arrangement for the interference level control of detectors, arranged in a danger detection device |
| DE19850579C2 (en) * | 1998-11-03 | 2001-09-13 | Honeywell Sa | Method for operating a transmitter |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3399398A (en) * | 1965-07-27 | 1968-08-27 | Mine Safety Appliances Co | Combustible gas monitoring system |
| US3634839A (en) * | 1968-03-11 | 1972-01-11 | American District Telegraph Co | Method and apparatus for suppressing spurious alarms in an electrical protection system |
| DE2341087C3 (en) * | 1973-08-14 | 1979-09-27 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Automatic fire alarm system |
| FI265273A (en) * | 1973-08-24 | 1975-02-25 | Stroemberg Oy Ab | |
| CH580311A5 (en) * | 1974-10-02 | 1976-09-30 | Cerberus Ag | |
| US4007456A (en) * | 1975-12-01 | 1977-02-08 | Craftor Inc. | Gas detecting and warning system |
| US4074243A (en) * | 1976-06-18 | 1978-02-14 | Erdco Engineering Corporation | Anticipatory flammable gas detection system |
| GB1599406A (en) * | 1977-08-11 | 1981-09-30 | Horstmann Gear Group Ltd | Gas detector with a failure sensor |
| DE2822240A1 (en) * | 1978-05-22 | 1979-12-06 | Bbc Brown Boveri & Cie | Central evaluation unit for fire or intruder detectors - raises line current following detector activation based on controlled current source (NL 26.11.79) |
| CH629905A5 (en) * | 1978-07-17 | 1982-05-14 | Cerberus Ag | GAS AND / OR FIRE DETECTING SYSTEM. |
| US4219806A (en) * | 1978-09-15 | 1980-08-26 | American District Telegraph Company | Dual alarm gas detector |
-
1981
- 1981-02-25 DE DE19813107830 patent/DE3107830A1/en not_active Ceased
-
1982
- 1982-01-22 EP EP19820100437 patent/EP0058824B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0058824A2 (en) | 1982-09-01 |
| DE3107830A1 (en) | 1982-09-09 |
| EP0058824A3 (en) | 1983-07-20 |
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