EP0246444B1 - Dispositif d'alarme pour l'indication de l'état d'épuisement d'un filtre à gaz - Google Patents

Dispositif d'alarme pour l'indication de l'état d'épuisement d'un filtre à gaz Download PDF

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Publication number
EP0246444B1
EP0246444B1 EP87105362A EP87105362A EP0246444B1 EP 0246444 B1 EP0246444 B1 EP 0246444B1 EP 87105362 A EP87105362 A EP 87105362A EP 87105362 A EP87105362 A EP 87105362A EP 0246444 B1 EP0246444 B1 EP 0246444B1
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EP
European Patent Office
Prior art keywords
alarm device
gas filter
warning device
measuring cell
heat exchanger
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 - Lifetime
Application number
EP87105362A
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German (de)
English (en)
Other versions
EP0246444A2 (fr
EP0246444A3 (en
Inventor
Jürgen Coym
Michael Freidank
Axel Dr. Schubert
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.)
Auergesellschaft GmbH
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Auergesellschaft GmbH
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Filing date
Publication date
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Application filed by Auergesellschaft GmbH filed Critical Auergesellschaft GmbH
Publication of EP0246444A2 publication Critical patent/EP0246444A2/fr
Publication of EP0246444A3 publication Critical patent/EP0246444A3/de
Application granted granted Critical
Publication of EP0246444B1 publication Critical patent/EP0246444B1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
    • A62B18/088—Devices for indicating filter saturation

Definitions

  • the invention relates to an electrical warning device with optical and acoustic alarm devices for displaying the state of exhaustion of a harmful gas from the air removing or restraining or converting into less harmful substances in connection with a breathing connection.
  • a depletion indicator for a spatial filter which consists of two filter parts which are connected to one another in terms of flow by a tube, from which the depletion indicator, which works according to an electrolytic measuring principle, is arranged laterally via a tube arrangement (FR-A-843 542) .
  • a depletion indicator is known in which at least two electrodes are arranged in the filter material at a certain distance from one another (DE-A-25 29 058).
  • the invention is therefore based on the object of providing a warning device for indicating the state of exhaustion of a gas filter which retains harmful gases and which ensures reliable indication of exhaustion with optimal utilization of the service life of the gas filter.
  • the advantages achieved with the invention consist in particular in that, on the one hand, the holding time of the gas filter can be increased considerably compared to that previously used and, on the other hand, there is a reliable indication of exhaustion.
  • the warning device 1 can be installed in a filter device.
  • the cartridge-like housing 2 of the warning device 1 is connected on the one hand with the connection piece 2a to the breathing hose 11 leading to the gas filter 10 and on the other hand with the connection piece 2b directly to the full face mask 12.
  • the gas filter 10 can, for. B. can also be a filter canister.
  • Carbon monoxide retaining gas filter is as follows: The gas filter 10 is ventilated in one direction, ie the inhaled air I flows through the gas filter and through the warning device 1 into the full face mask 12 of the user.
  • the exhaled air II then passes the warning device 1 to behind the heat exchanger 8 and flows out via the exhalation valve 9. From this it is clear that the warning device 1 is ventilated in pendulum breathing.
  • the heat exchanger 8 is cooled by the exhaled air II, so that the hot inhaled air I is cooled from the gas filter 10 when inhaled again, and advantageously to below 40 C, for example, in order to ensure proper functioning of the electrochemical measuring cell 3 when the inhaled air is above a bypass, not shown in the drawing by diffusion through a Teflon membrane reaches the inside of the measuring cell 3.
  • the measuring cell works on the principle of electrochemical oxidation and serves as a measuring element for the detection of harmful concentrations of harmful gas in the inhaled air, which can no longer be retained or removed by the upstream gas filter 10 in the event of exhaustion.
  • the measuring cell 3 measures a certain harmful pollutant concentration, which indicates that the pollutant retained in the gas filter breaks through, which means that the gas filter 10 is exhausted.
  • the warning device 1 with the connection piece 2a is connected directly to the gas filter 10 designed as a filter sleeve and with the connection piece 2b to the breathing tube 11 with the full mask 12.
  • the warning device 1 is connected between the gas filter 10 and the full face mask 12.
  • Fig. 6 shows the electronic circuit arrangement of the warning device 1 as a block diagram, consisting of the electrochemical measuring cell 3 which is followed by a signal amplifier 13 and this a threshold switch 14 and the light emitting diode 6 and the acoustic signal generator 7.
  • a battery 15 is provided with a battery monitor 16, which indicates the consumption of the battery on the light-emitting diode 6 and the signal transmitter 7 optically and acoustically.
  • the switching threshold of the threshold switch 14 is set to the measurement signal corresponding to the alarm-triggering measurement value, which corresponds to a certain harmful gas concentration which indicates the end of the usage time of the gas filter 10.
  • the measurement signal coming from the measuring cell 3 exceeds the set switching threshold (alarm threshold) of the threshold switch 16, its output becomes conductive and the LED 6 and the signal transmitter 7 are activated and trigger the optical and acoustic alarm.
  • the gas filter 10 is then used up.

Claims (6)

  1. Dispositif électrique d'avertissement comportant des générateurs optique et acoustique d'alarme pour indiquer l'état d'épuisement d'un filtre à gaz, qui élimine ou retient des gaz polluants de l'air ou les convertit en des substances moins nocives, en liaison avec un masque respiratoire, caractérisé en ce que
    a) le dispositif électrique d'avertissement (1), qui est raccordé au masque respiratoire (12) est réalisé sous la forme d'une unité entièrement séparée du filtre à gaz (6) et est monté en aval du filtre à gaz dans la direction de circulation du gaz, et
    b) le dispositif d'avertissement (1) est constitué par un boîtier en forme de cartouche (2) comportant deux tubulures de raccordement opposées (2a et 2b) et dans lequel sont disposés une cellule électrochimique de mesure (3) utilisée comme élément de mesure pour déceler des concentrations nocives de gaz polluants et comportant un montage électronique (5) et les générateurs optique et acoustique d'alarme (6 et 7) ainsi qu'un échangeur de chaleur (8), qui subdivise le boîtier (2) en deux chambres (A et B), dont l'une (A) possède une soupape d'expiration (9), le générateur d'alarme optique ou acoustique étant une diode à luminescence (6) ou un générateur de signaux (7).
  2. Dispositif d'avertissement selon la revendication 1, caractérisé en ce qu'en aval de l'échangeur de chaleur (8) sont disposés, dans l'autre chambre (B) du boîtier (2), le montage électronique (5) pour la cellule électrochimique de mesure (3), le générateur de signaux (7) et la diode à luminescence (6).
  3. Dispositif d'avertissement selon la revendication 2, caractérisé en ce que pour l'alimentation en énergie du montage (5), il est prévu une pile (15) possédant une unité de contrôle (16), qui indique la consommation de la pile (15) à la diode à luminescence (6) et au générateur de signaux (7).
  4. Dispositif d'avertissement selon la revendication 1 ou 2, caractérisé en ce que le dispositif d'avertissement (1) monté entre le masque respiratoire (12) et le filtre à gaz (10) peut fonctionner selon une respiration pendulaire, l'air expiré (II) s'évacuant par l'échangeur de chaleur (8) et la soupape d'expiration (9).
  5. Dispositif d'avertissement selon la revendication 1 ou 2, caractérisé en ce que lors de son passage dans le dispositif d'avertissement (1), l'air aspiré (I) parvient par diffusion à l'intérieur de la cellule de mesure (3), par l'intermédiaire d'un by-pass.
  6. Dispositif d'avertissement selon les revendications 1 et 2, caractérisé en ce que le montage électronique (5) du dispositif d'avertissement (1) possède un commutateur à valeur de seuil (14), dont le seuil de commutation est réglable sur un signal de mesure qui correspond à la valeur de mesure, qui déclenche une alarme, et qui correspond à une concentration déterminée en gaz polluants, mesurée par la cellule de mesure (3) et indique la fin de la durée d'utilisation du filtre à gaz (10).
EP87105362A 1986-04-22 1987-04-10 Dispositif d'alarme pour l'indication de l'état d'épuisement d'un filtre à gaz Expired - Lifetime EP0246444B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3613512A DE3613512C3 (de) 1986-04-22 1986-04-22 Elektrische Warneinrichtung zur Anzeige des Erschöpfungszustandes eines Schadgase zurückhaltenden Gasfilters
DE3613512 1986-04-22

Publications (3)

Publication Number Publication Date
EP0246444A2 EP0246444A2 (fr) 1987-11-25
EP0246444A3 EP0246444A3 (en) 1990-08-22
EP0246444B1 true EP0246444B1 (fr) 1993-02-03

Family

ID=6299213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105362A Expired - Lifetime EP0246444B1 (fr) 1986-04-22 1987-04-10 Dispositif d'alarme pour l'indication de l'état d'épuisement d'un filtre à gaz

Country Status (3)

Country Link
US (1) US4873970A (fr)
EP (1) EP0246444B1 (fr)
DE (2) DE3613512C3 (fr)

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DE4133235A1 (de) * 1991-10-07 1993-04-08 Draegerwerk Ag Geblaeseunterstuetztes atemschutzgeraet mit einem aufsetzbaren steuerteil
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DE4214239C2 (de) * 1992-04-30 1994-06-16 Draegerwerk Ag Atemschutzmaske mit einem indikator
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Also Published As

Publication number Publication date
DE3783944D1 (de) 1993-03-18
DE3613512A1 (de) 1987-10-29
DE3613512C2 (fr) 1994-09-29
EP0246444A2 (fr) 1987-11-25
US4873970A (en) 1989-10-17
EP0246444A3 (en) 1990-08-22
DE3613512C3 (de) 1994-09-29

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