EP0961254A2 - Appareil de protection contre les explosions de gaz - Google Patents

Appareil de protection contre les explosions de gaz Download PDF

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Publication number
EP0961254A2
EP0961254A2 EP99110354A EP99110354A EP0961254A2 EP 0961254 A2 EP0961254 A2 EP 0961254A2 EP 99110354 A EP99110354 A EP 99110354A EP 99110354 A EP99110354 A EP 99110354A EP 0961254 A2 EP0961254 A2 EP 0961254A2
Authority
EP
European Patent Office
Prior art keywords
gas
protection device
explosion protection
signal
gas explosion
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.)
Withdrawn
Application number
EP99110354A
Other languages
German (de)
English (en)
Other versions
EP0961254A3 (fr
Inventor
Franz-Josef Leis
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.)
Wendling Umwelttechnik
Original Assignee
Wendling Umwelttechnik
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 Wendling Umwelttechnik filed Critical Wendling Umwelttechnik
Publication of EP0961254A2 publication Critical patent/EP0961254A2/fr
Publication of EP0961254A3 publication Critical patent/EP0961254A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
    • G08B21/16—Combustible gas alarms
    • 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
    • G08B25/06—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 using power transmission lines

Definitions

  • the invention relates to a gas warning device with a Gas sensor, an encoder and a decoder.
  • a gas warning device of this type (DE 32 44 878 A1) is a Flammable gas sensor, a measurement conversion device, a transmission line and a test facility of the transmitting measurement signal provided, the measurement signal Error is checked, if necessary a warning signal is generated and otherwise the concentration of flammable gases is displayed becomes. There are extensive device facilities for these functions necessary.
  • the invention has for its object a gas explosion protection device to create that built up with simple means and can be installed.
  • the task is based on the characteristics of the Claim 1 solved and by the further features of Subclaims designed and further developed.
  • a gas sensor is used, which when exceeded the concentration of flammable gases.
  • Which he Signal status "Danger” is coded by an encoder Alarm signal via the house line to a decoder sent the remote to the house network is connected and for example in the fuse box located.
  • the decoder responds and issues a control signal which causes a switching device to Switch off the house power line in the danger area. From the fuse box can be in the danger zone Switch off the leading circuit easily.
  • a warning or alarm device can be switched on become. It is also possible to have a telephone dialer to activate, via which the alarm is given. Finally, there may also be a check valve in the gas line be present when switching off the circuit in the Locked state goes and the gas supply line blocks. Conveniently a memory is assigned to the decoder, which the Alarm state is maintained until it is willful, for example by pressing a button becomes.
  • the gas explosion protection device contains at least two parts, namely a gas warning device GWS and a gas alarm and Activation device GAF.
  • a gas warning device GWS can be an alarm siren, a valve actuator or VSA a telephone dialing device TWE can be controlled.
  • the Connection between the warning device GWS and the gas alarm and Activation device GAF takes place via the existing mains cable NL of the building in which the gas explosion protection device is installed.
  • the gas alarm and free-standing device GAF is preferred in an existing switch box Installed. If you hear the alarm elsewhere want, it is conveniently possible to add a gas warning device GWZ via an existing socket to the domestic power line NL to be connected to the encoder of the Alarm device emitted alarm signal and in the To give living area alarm.
  • the telephone dialing device TWE can also have a decoder be controllable, as is the case with the gas warning accessory is. Then this TWE device can be used anywhere where there is an outlet.
  • Fig. 2 shows the structure of the gas warning device GWS. It will a commercial gas sensor GS type TG 813 is used.
  • This gas detector GS warns early of dangers caused by Town gas, propane, butane, methane are generated.
  • the effect of Circuit is based on the conductivity of a Semiconductor increases when flammable gases (such as methane, Butane). In a nutshell this effect is due to the following physical behavior underlying. At the numerous grain boundaries of the Semiconductor crystals become oxygen atoms from the air bound and form there due to reversible oxidation Potential locks. When exposed to certain gases Reduction leading to an increase in electron density in the Space charge area leads and the potential difference to the Breaks down grain boundaries (increase in conductivity, decrease in Resistance). This process is reversible, i.e. at the Reaching the original state of the air accomplishes this Material again an old resistance.
  • the sensor used here essentially consists of tin dioxide (SnO 2 ), a sintered semiconductor material. Even low concentrations of certain gases cause a significant increase in conductivity, which can be more than two orders of magnitude. In other words, the electrical resistance of this material drops below 1% of the value it has in normal air when exposed to these gases.
  • the gas sensor TG 813 is connected to a signal evaluation SA of the type LM 311 N connected, which in turn from a power supply NT is fed for 12V DC voltage.
  • the signal evaluation SA is assigned a threshold value transmitter ⁇ , which determines when the signal state "danger" is given, which the Signal evaluation SA to a switch-on delay element EV from Type SE 555 passes on.
  • This switch-on delay element EV a CD 4011 BCN type link is connected downstream, which controls an HT 600 EC encoder. This generates a coded alarm signal by a network modulator NM switched as a transmitter on the house network line NL so that it can be received anywhere in the house.
  • Fig. 3 shows the gas alarm and free call device GAF.
  • a power supply NT for 12V DC voltage Supply of the various components include a demodulator DM as a receiver and one connected to it Decoder DC of type HT 614.
  • an ASA type ABB 5 2-A1 shunt release is connected, which in turn is a type SA S automatic circuit breaker 280 controls the endangered circuit of the house power line De-energize NL to prevent any sparking exclude in the danger zone.
  • the switching relay SR can also have a siren or flashing light be connected as shown.
  • a valve actuator VSA or a telephone dialer Connect TWE as indicated in Fig. 1.
  • the valve actuator can also be constructed so that it assumes its blocking position when de-energized. If so in the area of gas supply in the basement of a building gas is detected by the gas sensor and the house power line in this area is turned off at the same time the gas blocked. Because the network is elsewhere in the building remains switched on, can be given without further alarm become.
  • the switching relay SR in Fig. 3 is a one Memory for the coded alarm signal, since it is his Maintains the switching state until it is back in by hand the "safe" position is reset. So no one can Alarm signal go unnoticed and ignored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)
  • Telephonic Communication Services (AREA)
EP99110354A 1998-05-28 1999-05-28 Appareil de protection contre les explosions de gaz Withdrawn EP0961254A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29809490U 1998-05-28
DE29809490U DE29809490U1 (de) 1998-05-28 1998-05-28 Gasexplosions-Schutzgerät

Publications (2)

Publication Number Publication Date
EP0961254A2 true EP0961254A2 (fr) 1999-12-01
EP0961254A3 EP0961254A3 (fr) 2000-06-28

Family

ID=8057718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99110354A Withdrawn EP0961254A3 (fr) 1998-05-28 1999-05-28 Appareil de protection contre les explosions de gaz

Country Status (2)

Country Link
EP (1) EP0961254A3 (fr)
DE (1) DE29809490U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005045476A1 (de) * 2005-09-22 2007-04-05 Appliedsensor Gmbh Heizeinrichtung mit Detektion brennbarer Gase oder Aerosole

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244878A1 (de) 1981-12-09 1983-06-16 The Bendix Corp., 48076 Southfield, Mich. Meldeeinrichtung fuer brennbare gase

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360881A (en) * 1980-07-07 1982-11-23 Martinson John R Energy consumption control system and method
IT1159756B (it) * 1982-03-18 1987-03-04 Zanussi Zeltron Inst Sistema di controllo e sicurezza a onde convogliate
JPS60134634A (ja) * 1983-12-23 1985-07-17 Matsushita Electric Ind Co Ltd 流体制御装置
JPS6181036A (ja) * 1984-09-28 1986-04-24 Nisshin Sangyo Kk 電力線搬送によるガス漏れ集中監視方式
DE3824532A1 (de) * 1988-07-20 1990-01-25 Bosch Gmbh Robert Gefahrenmeldesystem mit rechnerauswertung
IT1249197B (it) * 1991-04-29 1995-02-20 Eurogiada Srl Dispositivo di rilevazione di impurita' atmosferiche
IT1280712B1 (it) * 1994-12-01 1998-02-06 Stefano Rinaldi Sistema distribuito per il rilevamento di inquinamento ambientale, in particolare inquinamento atmosferico

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244878A1 (de) 1981-12-09 1983-06-16 The Bendix Corp., 48076 Southfield, Mich. Meldeeinrichtung fuer brennbare gase

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005045476A1 (de) * 2005-09-22 2007-04-05 Appliedsensor Gmbh Heizeinrichtung mit Detektion brennbarer Gase oder Aerosole

Also Published As

Publication number Publication date
DE29809490U1 (de) 1999-10-07
EP0961254A3 (fr) 2000-06-28

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