Abstract: The present invention pertains to a device for cooling testing tubes during sampling by evaporating a liquid. The cooling device causes a controlled cooling effect that is practically independent of the state of the ambient air during the sampling and is easy to handle. After flowing through the testing tube (2), the gas to be investigated flows through a layer of filler (7) that surrounds the testing tube (2) and is impregnated with a liquid.

Abstract: A process for determination of one component of very low concentration in a test gas, which is guided in a supply line for concentration of the component across a sample collector, whose amassed quantity of samples is relinquished to a detection sensor. The arrangement makes available a measurement signal even during the collection of the sample. It also makes even the individual components of a multicomponent test gas detectable and a component-specific cross sensitivity of the detection sensor controllable. For this, the following process steps are provided: the test gas is first guided across the detection sensor 3 and then across the multistaged sample collector 7 having arrangements for separation of the several components; then after interruption of the supply of test gas, each individual stage 4, 5 and 6 separately relinquishes its separated component to the detection sensor 3.

Abstract: The invention is directed to an arrangement for detecting gaseous components in air wherein an air pumping device pumps a sample quantity through the testing tube. The air pumping device includes a receiver for the testing tube and the charge in the testing tube is evaluated. The arrangement is improved in that the detection of different components with the corresponding testing tubes is conducted automatically in that the data characteristic for the measurement is automatically considered and processed to a display of the measured values. For this purpose, the testing tube is provided at its outer periphery with a machine-readable memory whose data is detected by a read unit when the testing tube is introduced into the receiver of the pumping device. The data from the machine-readable memory is conducted to an evaluation unit.

Abstract: A process for calibrating a gas metering instrument comprises flushing a test chamber with a flushing gas and subsequently filling it with a calibrating gas having a predetermined composition of carrier substance and carrier gas. The calibrating gas does not have to be carried and made available constantly in its predetermined composition. Thereby a reduction in the volume of the gas metering instrument is obtained. For this purpose, provisions are made so that a feed device introduces a specified amount of calibrating substance from a reservoir into the heat chamber, whereupon the calibrating substance mixes with the flushing gas in the test chamber to form the calibrating gas of predetermined composition. In addition, equipment is described for implementing the process of calibrating a gas metering instrument.

Abstract: A test tube for combustible gases is intended to be provided with protective devices, so that, in proving the presence of combustible gases, it cannot become an ignition source. To that end, a flame arrester is arranged in front of and/or behind the test material.

Abstract: A device for indicating the presence of a gas includes a closed housing having an interior wall with a color indicator disk on one side wall and an opposite wall having an opening with an inflow pipe for the inflow of the gas to be detected. The interior of the housing forms a flat measuring chamber having the side wall with the detector disk of a size comparable to the length and diameter of the inflow pipe so as to form a diffusion area across which a mass transport of the gas to be detected takes place, that is, largely independent of air currents. The color indicated disk advantageously has a circular periphery and the inflow pipe is of cylindrical section and it is smaller than one-fifth the diameter of the measuring chamber having the disk. Advantageously, the length of the pipe section is less than the thickness of the measuring chamber.

Abstract: A process for calibrating a gas metering instrument comprises flushing a test chamber with a flushing gas and subsequently filling it with a calibrating gas having a predetermined composition of carrier substance and carrier gas. The calibrating gas does not have to be carried and made available constantly in its predetermined composition. Thereby a reduction in the volume of the gas metering instrument is obtained. For this purpose, provisions are made so that a feed device introduces a specified amount of calibrating substance from a reservoir into the heat chamber, whereupon the calibrating substance mixes with the flushing gas in the test chamber to form the calibrating gas of predetermined composition. In addition, equipment is described for implementing the process of calibrating a gas metering instrument.

Abstract: Gas filters protect the user of respirator equipment against the inspiration of harmful gases. The protection decreases with the use of the filter. To alert the user in time to the imminent exhaustion of the filter material, the respirator is equipped with an indicator that makes the remaining time of use visible through optical characteristics such as color change. The indicator provides for the inclusion of an indicator granulate loosely filled between two discs and permeable to the respiration gas, which changes its color as it detects a gas to be filtered out. The indicator is located in a container open to the gas flow which is covered by an inlet screen and it extends to a given immersion depth into the filter material. The immersion depth guarantees that the respiration gas flows uniformly through the indicator with each inspiration.

Abstract: A highly sensitive test tube according to the invention increases the sensitivity of detection of a component in a gas substantially and thus enlarges the area of use of the test tube. It possesses a reagent strip impregnated according to the gas to be detected, which strip is held by a granular fill material between holding elements. The test gas, conveyed by a pump through the test tube, from which test gas the gas to be detected is removed at the reagent strip, is continually moved through the granular fill material and thoroughly mixed, so that the actual continually decreasing concentration of the gas component is available at the reagent strip. Upon complete removal of this gas component by reaction with the reagent strip, the concentration can then be read at the reagent strip. The narrow reagent strip, which takes up the entire gas component, evidences even small admixtures.

Abstract: A housing contains a diffusion indicator tube provided with a predetermined breaking point and the housing has an upper part and a lower part joined together by a film hinge. To open the inserted diffusion indicator tube its predetermined breaking point is positioned opposite the film hinge. By bending the housing parts, the break-off end breaks off the test tube at the predetermined breaking point, thereby opening the reaction section. The parts of the test tube are removed, and then the reaction section is pushed into the upper part, now with its closed end first, whereupon it is snapped into the lower part. Its opening at the bottom shoulder of the lower part is exposed to the ambient atmosphere which diffuses into it. In the presence of the gas to be monitored there will be discoloration due to reaction. The discoloration can be observed continuously through the open side of the holding means.

Abstract: A device for the measurement of oil mists in a test gas comprises a glass tube which has ends which are openable such as by breaking off to permit a test gas to be directed therethrough. The glass tube contains in order in the direction of flow: a breakable ampoule filled with sulfuric acid, a particulate air filter, a distributor layer of quartz glass grit, and an indicator layer of deactivated silica gel. To effect a testing of a test gas it is directed through the glass tube after the tube ends have been broken off. Any oil mist and gas will be engaged with the filter layer. Thereafter, the ampoule is broken and sulfuric acid flows to the filter where it reacts with the mist and causes a defined color reading. In comparison with a color standard shows the oil concentration of the test gas.

Abstract: A method of determining the alcohol content of air exhaled by a person using a flow through testing tube having an alcohol indicating material therein and a sampling tube to which the air is directed which has a material therein for retaining the alcohol of the breathing air and also using a suction pump comprises cooling the sampling tube, passing the exhaled air through the cooled sampling tube, measuring a volume of the air passing through the cooled sampling tube, heating the sampling tube and connecting the suction pump to the sampling tube to suck flushing air through the heated tube and then through the testing tube. The sampling tube advantageously contains a silica gel to retain the alcohol therein. The volume measuring device may be a measuring bag.

Abstract: A testing device for measuring for nickel-aerosols includes a glass tube having breakable end tips for opening the tube for the passage of a test gas therethrough and a filling in the tube which includes a closed ampoule of hydrochloric acid, a filter layer for entrapping nickel particles of the gas being tested, a reaction layer of a material impregnated with a color reagent for nickel, a granular buffer layer and a second breakable ampoule of ammonia water arranged in the direction of flow of the test gas through the tube. The testing is carried out by breaking the first ampoule to release hydrochloric acid which flows through the filter and reacts with the nickel particles which pass to the reagent layer, subsequently breaking the second ampoule so that its contents will be directed into the granular buffer layer and in the reagent layer.

Abstract: An apparatus for testing copper concentration of a test gas comprises a glass tube having breakoff points at each end with an ampoule filled with a nitric acid arranged upstream of a filter which is followed downstream by a reaction layer of silica gel impregnated with a reagent for copper. The glass tube is opened by breaking off breakoff points at each end and the gas to be tested is pumped through the tube so that any suspended particles including copper particles will be deposited on the filter layer too. Thereafter, the ampoule within the glass tube is broken to release the nitric acid which is directed through the filter layer to the reaction layer. The nitric acid which reacts with the copper deposited on the filter layer moves to the reaction layer and produces a discoloration which is proportional to the amount of copper filtered out from the test air.

Abstract: A method of testing a person's breath for the purpose of determining the alcohol content of the breath as an indication of the alcohol in the person's blood and using a carbon monoxide gas detector comprises treating the breathing air to oxidize the alcohol of the person's breath-air into carbon monoxide, collecting a predetermined quantity of the carbon monoxide with the treated breathing air and passing the treated quantity through the carbon monoxide detector to determine the quantity of carbon monoxide as an indicator of the alcohol content. The apparatus advantageously include a pyrolysis oven through which the breathing air is directed to oxidize the alcohol into carbon monoxide. The oven is connected to a collector to collect the predetermined quantity of the breathing air and the collector in turn is thereafter connected to a carbon monoxide testing tube.

Abstract: A method of determining the alcohol content of air exhaled by a person using a flow through testing tube having an alcohol indicating material therein and a sampling tube to which the air is directed which has a material therein for retaining the alcohol of the breathing air and also using a suction pump comprises cooling the sampling tube, passing the exhaled air through the cooled sampling tube, measuring a volume of the air passing through the cooled sampling tube, heating the sampling tube and connecting the suction pump to the sampling tube to suck flushing air through the heated tube and then through the testing tube. The sampling tube advantageously contains a silica gel to retain the alcohol therein. The volume measuring device may be a measuring bag.

Abstract: An indicator device for the quantitative determination of aerosol-type metal cyanides, including a tube provided with a bore extending therethrough, a front layer of a substrate material impregnated with sulfuric acid or phosphoric acid and a following indicating layer of a substrate impregnated with mercuric chloride and methyl red.

Abstract: A testing tube for measuring sodium hydroxide and/or calcium oxide aerosols, comprises, a glass tube having breakoff points at each end to open at each end and containing a front layer of a substrate material impregnated with ammonium chloride and a following indicating layer of a substrate material impregnated with an acid and bromphenol blue.

Abstract: A gas detecting and measuring device with which the gas or air to be examined is taken into a testing or measuring vessel such as an indicator tube by means of a feed system comprises an electrical motor driven suction pump and a pressure gauge connected thereto for pumping the gas to be tested through a connecting line. The connecting line includes the suction pump and a volume sensor provided in addition to a pressure sensor. The differential signal formed of the volume signal is converted in a characteristic generator to a desired pressure signal and the actual pressure signal from the pressure sensor is applied to a speed governor for the suction pump motor so that the suction pump is controlled to effect equalizing the actual pressure signal with a desired pressure signal.

Abstract: A device for measuring gases and aerosols with a detector tube, comprises, a duct or test tube for the passage of a test gas therethrough which includes a forelayer in the duct through which the test gas is passed, and which has a substance which will react with the test gas to form a new gas substance. The gas-permeable forelayer advantageously acts as a filter for the aerosol and comprises a substrate, such as a silica gel or a glass fiber, which is impregnated with a material, such as zinc dust and arsenic trioxide which is saturated with water. The aerosol which contains a sulfuric acid in the gas will react after deposit in the forelayer with the zinc forming a nascent hydrogen which reduces the arsenic trioxide immediately to arsenic hydride. The test tube also contains an indicating layer with a material which is known for producing an indication of the newly formed gaseous substance.