Abstract: An improved gas-measuring device and a gas-measuring process is provided for determining the concentration of a gas by infrared absorption. The improvement is the compact design of the gas-measuring device and the higher reliability of the measurement results furnished by the gas-measuring device and the gas-measuring process. The gas-measuring device has an infrared radiation source (1), a pyramid-like beam splitter (7), and a quadrant detector, which has two measuring detectors (3, 4) and two reference detectors (5, 6). This guarantees a compact design of the gas-measuring device and, as a consequence, low fault liability of the measurement. The gas-measuring process includes an advantageous evaluation of the measuring signals (M1, M2) received by the two measuring detectors (3, 4) and of the measuring signals (R1, R2) received by the two reference detectors (5, 6).

Abstract: The invention relates to a gas sensor with an open optical measurement path for optical measurement of at least one gas component, having a light source unit (1), a detector unit (2), between which units the optical measuring path (13) extends, and having a control and evaluation device; the light source unit (1) has a light source (3) and optical guide elements for transmitting a measuring light beam to the detector unit (2), and the detector unit (2) includes a detector (4), which when oriented in the beam path of the measuring light beam detects the intensity of light from the measuring light beam, and the control and evaluation device (11) is designed to determine, on the basis of the measurement signal of the detector (4), a standard for the concentration of the gas component to be investigated.

Abstract: A parallel folded filter has good sealing properties between the folded filter web and the filter housing with the smallest possible amount of sealant. The filter is prepared with an elliptical filter blank, in which the rows (1) of fold lines (locations of predefined fold edges or imaginary fold edges) are at right angles to an axis (4) extending in the direction of the greatest longitudinal extension of the filter blank (2). The circumferential contour of the filter blank (2) is dimensioned such that it assumes a circular shape with the folds stood up (e.g., in a folded state). An adhesive bead (3) is applied along the circumferential contour. A ring-shaped filter housing accommodates the folded filter blank (2) such that a circumferential support surface is present for the adhesive bead (3).

Abstract: A breath alcohol measuring apparatus includes a sample intake channel (7) for receiving the respiratory gas sample and a temperature sensor mounted in the sample intake channel (7). The breath alcohol measuring apparatus is so improved that the influence of the mouthpiece on the detection of the temperature of the respiratory gas sample is substantially eliminated. The temperature sensor is configured as an infrared optical thermometer (14) with a filter (10) transmissive for the infrared radiation. The filter (10) is disposed in the sample intake channel (7).

Abstract: A container for the gastight sealing of a respirator. The container has two container shells (1, 2) abutting on front surfaces with a circumferential sealing element. The container second container shell (2) is provided with a handle (3) mounted at two opposite points of rotation (6). The handle (3) has a lever arm (5), which engages in the first container shell (1) in the closed position of the container. In the closed position of the container, the handle (3) preferably engages in an additional bracket (4) that is detachably connected to the first container shell (1).

Abstract: The invention is directed to a method for measuring gas concentrations with a measuring head which is provided with a satellite-supported global positioning device. With the method, gas concentrations at various locations can be determined. The position of the measuring head is determined at predetermined time intervals and first position data of a previously measured first position is compared to second position data of a current position. When a predetermined limit value between the first position data and the second position data is exceeded; a measured value of gas concentration corresponding to the current position together with the second position data are stored in a data memory of the measuring head.

Abstract: A carrying device for a respirator is combined with protective clothing. The combination includes shoulder belts and waist belts on the carrying device. Quick-connection elements are provided at the ends of the shoulder belts and of the waist belts. Coupling elements are provided on the protective clothing for the quick-connection elements.

Abstract: An infrared optical gas sensor is improved with respect to the quality of the measured signal. The infrared radiation detectors (4, 6) used as the reference radiation and measuring radiation detectors include thin layers of a partially transparent material, which sends an electric measured signal that depends on the radiation intensity received. The infrared radiation detectors are arranged stacked one over the other and with an interposed narrow-band filter (3, 5) each, which are transparent at the measuring wavelength. The infrared radiation detectors have an electrically conductive coating on the top side and the underside and are contacted.

Abstract: A biomimetic reagent system is provided containing an oxygen donor and a catalyst based on porphyrin, which are applied to a carrier. A device that contains the system is also provided for determining components of gas or vapor samples, especially aromatics, such as benzene. A process for hydroxylating aromatics, such as benzene, using the biomimetic reagent system is also provided.

Abstract: A swab analyzer with advantageous handling and detection sensitivity for the immunochemical detection of substances. The analyzer has a housing, an eluent application zone (a swabbing pen 2) and a reaction zone (6). The housing (1) has a local elevation with a central opening, from which a sampling and eluent application zone, designed as a porous swabbing pen (2), projects. The local elevation is provided with an at least partially circular collection groove (3) for receiving excess eluent. A window (10) is present in the housing (1) at a spaced location from the local elevation for evaluating the reaction zone (6) placed under it. The sampling and eluent application zone as well as the reaction zone (6) with the signal zones (7) are in capillary fluid connection with one another.

Abstract: A testing elements for the calorimetric determination of oxidizable gas and/or vapor components in gas mixtures is provided. The testing element contains, besides usual oxidizing agents, at least one redox indicator, which is in the oxidized form. The redox indicator is preferably a benzidine derivative according to the general formula in which the radicals R are identical or different and denote a hydrogen, alkyl, aryl, halogen, trifluoromethyl, cyano, nitro, dialkylamino, ester, sulfoxyl ester, alkyloxy or aryloxy, X denotes a halogen, Y denotes a trifluoromethyl, cyano, nitro, dialkylamino, ester, sulfoxyl ester, alkyloxy or aryloxy, n is an integer from zero to three, and m equals 5−n. The testing elements are preferably designed as detector tubes that contain carrier materials, to which the oxidizing reagents and redox indicators are applied.

Abstract: A process for operating an electrochemical measuring cell (1) is described, with which it is possible to carry out gas concentration measurements already shortly after switching on the measuring cell (1). The process includes the steps that potential voltage pulses are applied to the measuring cell (1) in a state of readiness of the measuring cell (1), in which the potential voltage is switched off. A system and device are also described.

Abstract: A protective breathing mask has a connector housing unit having a connector housing for accommodating breathing mask components. The connector housing unit has a flange-like collar extending from the connector housing. The flange-like collar has a connecting rim. A mask body made of an elastomer has a profile-reinforced portion defining a cutout for the connector housing unit and the profile-reinforced portion is shaped to match the peripheral rim. A clamping ring is provided for fixedly securing the profile-reinforced portion at the connecting rim. The clamping ring has a slot for holding the profile-reinforced portion. The clamping ring is shaped to match the connecting rim of the flange-like collar and has a connecting surface for connecting the clamping ring to the collar at the connecting rim.

Abstract: A process is provided for improving the reliability of operation of optical gas sensors with at least one radiation source and with at least one radiation detector. By comparing and evaluating the measured signals (18) (D) sent by the radiation detector, of which there is at least one, with first, second and third stored reference values (D1, D2, K), it is achieved, on the one band, that in the case of toxic gas concentrations or of gas concentrations that are critical because of explosion hazard, second measured values (15) continue to be sent for the protection of the user corresponding to the range between the reference values D1 and D2 when the third reference value (K) is exceeded. On the other hand, at least first warning signals (16) are sent by the gas sensor to warn that a preset degree of contamination has been reached in order for maintenance or cleaning of the gas sensor to be performed or in order for the gas sensor to be replaced with a new gas sensor shortly.

Abstract: The invention is directed to a voice transmitter for a breathing protective mask. The voice transmitter includes a membrane housing (2) and a clamping ring (3) which can be connected to the membrane housing (2). The voice transmitter also includes a voice membrane (4) between the membrane housing (2) and the clamping ring (3). The voice membrane (4) has an outer membrane portion (14) which is accommodated at a connecting location between the clamping ring (3) and the membrane housing (2). An inner portion (15) of the membrane (4) is tensioned over an annularly-shaped projection (8) located on the membrane housing (2). The pretensioning of the voice membrane is adjusted in a simple manner in that the clamping ring (3) has an annularly-shaped support surface 13 for the inner membrane portion (15) and that the connecting location is configured as a threaded connection (7, 10).

Abstract: The invention is directed to an arrangement for detecting a gaseous component in a gas flow which reaches a measuring chamber (4) via a sample intake line (3). The arrangement includes a flow throttle (8) in the sample intake line (3) and has a pressure sensor (9) for detecting the pressure at the inflow end of the flow throttle (8). The pressure sensor (9) can also be used to measure the ambient pressure. A flow detector (10) for generating a zero-flow signal is provided at a position along the sample intake line (3).

Abstract: The invention is directed to an electrochemical measuring cell for detecting hydride gases, preferably arsine and phosphine. The measuring cell includes at least one working electrode (3) made of a catalytically inactive material and a reference electrode (4) in an electrolyte chamber (6) filled with an electrolyte containing sulphuric acid. The measuring cell is improved as to the cross sensitivity with respect to other toxic gases. The working electrode is configured as a carbon electrode (3) and an electrolyte additive of silver sulphate is provided in saturated solution in the electrode (9).

Abstract: A device for gas sampling for gas analysis is provided which uses detector tubes. The device includes a test gas container with a gas inlet pipe, a gas outlet pipe, a mounting opening for the detector tube and with a break-off device for a detector tube tip located in the mounting opening. Nonreturn valves are provided on the gas inlet pipe and the gas outlet pipe. The closing bodies of the nonreturn valves are pressed by springs against corresponding valve seats and are held in a closed position, and are arranged in relation to one another such that a sample gas flow can be established from the gas inlet pipe to the gas outlet pipe.

Abstract: A test strip for the immunochemical detection of substances after sampling from surfaces, with a conjugate zone (2) located between an eluent application zone (1) at one end of the test strip and a reaction zone (3) at the opposite end, the zones being in liquid connection with one another. A section of the test strip in the area including the eluent application zone and the reaction zone is used to wipe off the surface and as a sampling zone (4). The eluent application zone may be used as a sampling zone. The test strip is connected to a preferably flexurally rigid test strip holder (6), which does not cover the sampling zone (4).

Abstract: An underwater breathing apparatus is so improved that it is simple to manufacture and that it provides a decoupling of the breathing gas conducting components and attachment elements. A support vest (2) is provided which includes an inner enclosure (3) and a textile outer enclosure. The inner enclosure (3) extends from the shoulders to the hips of the person carrying the apparatus. The inner enclosure (3) is made of two panels (31, 32) which lie one atop the other. On the periphery, the panels (31, 32) are provided with a first weld seam (33) which connects the panels at the periphery. Further weld seams (34, 36, 37), which connect the panels, are provided within the inner enclosure (3). The weld seams (34, 36, 37) subdivide the inner enclosure (3) into at least an inhalation bag (38), an exhalation bag (39) and a buoyancy bag (40).