The disclosure discloses a wide-concentration multi-component hazardous gas detector and an implementation method thereof, solving the problems of the existing technology that false negative results, ultra-limit concentration and sensor poisoning often occur in a gas detector used in fire fighting forces. The wide-concentration multi-component hazardous gas detector includes a gas diluting and sampling connector, a sensor integrated module, electrochemical sensors, ADC (analog to digital converter) circuits, MCU (microprogrammed control unit) single chip microcomputers, acousto-optic alarms, a 4-button keyboard module, an LED (light-emitting diode) display module, an SD card data memory module, a power supply control and electric quantity display module, a high-performance lithium battery pack, a small evacuation pump, 433M signal transmission modules and a remote command platform signal collection terminal.

Method for adapting the concentration of a sample gas in a gas mixture to be analysed by a gas chromatograph assembly (10), the gas chromatograph assembly (10) comprising a sample gas inlet (20) for introducing a sample gas to be analysed, a secondary gas inlet (40), a gas chromatograph infrared sensor (12), a gas chromatograph column (26), and a gas chromatograph bypass (28) parallel to the column (26), characterized by a) introducing an amount of sample gas through the sample gas inlet (20), b) introducing an amount of secondary gas through the secondary gas inlet (40), c) mixing the sample gas and the secondary gas to a gas mixture and conducting the gas mixture via the gas chromatograph bypass (28), d) circulating the gas mixture in a gas conducting loop (52) comprising the gas chromatograph bypass (28), the gas chromatograph infrared sensor (12) and not comprising the gas chromatograph column (26), e) analysing the gas mixture thus obtained by means of gas chromatography employing the gas chromatograph column (26) and the gas chromatograph infrared sensor (12).

A monitoring device (1) for a system for generating medical compressed air includes a measured air line (3) removing compressed air from a compressed air supply line downstream of a compressed air conditioning unit. A sensor (2) generates a measured signal as a function of a property of the compressed air fed through the measured air line. A humidifier (8) humidifies the compressed air upstream of the sensor. An output unit (12) outputs information about the property of the compressed air to a user on the basis of the measured signal. A tap (4) removes compressed air and an actuator (5) changes a volume flow and/or mass flow of the compressed air, which volume flow and/or mass flow prevails in the measured air line. The actuator is inserted into the tap in a measuring mode and is removed from the tap in a compressed air removal mode.

A method for verifying system functions of an oxygen reduction system, said functions being used during operation. The oxygen reduction system reduces or maintains an oxygen concentration level in a protection region by supplying inert gas and to monitor or increase the oxygen concentration level, which has been previously reduced in the protection region or in a monitoring region. The method comprises: Detecting system functions being used during the operation of the oxygen reduction system. generating a license data set which contains licenses used by the system functions being used. reading a verification data set provided on a storage medium, wherein the verification data set contains at least one existing license— determining a license violation if each license used is not contained in the verification data set. outputting an error message, or deactivating at least one system function if a license violation is determined.

A gas mixing device for a NOx detector includes a 3/2 way gas valve having a diaphragm, a first inlet port, a second inlet port, and an exit port. A gas conduit connects the exit port to a gas mixing chamber. A controller controls the diaphragm to alternate between a first position and a second position. The first inlet port may receive a sample gas and the second inlet port may receive ozone gas. In the first position of the diaphragm, a bolus of sample gas enters the conduit, and in the second position of the diaphragm, a bolus of ozone enters the conduit. The alternating boluses of sample gas and ozone mix within the conduit and within the mixing chamber. A NOx detection instrument includes the gas mixing device, an ozone gas source, and an NO.sub.2 sensor in fluid communication with the mixing chamber.

To uniformly dilute particulate matter contained in a sample gas, a diluter includes an inflow portion, a mixing portion, a discharge portion, a connection portion, and an introduction portion. The inflow portion allows a sample gas to flow in. The mixing portion has an inner diameter larger than that of the inflow portion, and mixes the sample gas with a dilution gas to generate a diluted sample gas. The discharge portion discharges the diluted sample gas. The connection portion has a first tapered part whose inner diameter increases from a side connected to the inflow portion toward a side connected to the mixing portion. The introduction portion introduces the dilution gas into an internal space from a position downstream of the connection between the first tapered part and the inflow portion.

A gas measuring apparatus including at least one measuring channel including at least one sensor unit; and a core body including a first part and a second part, wherein the first part is joined at the second part at a flat or planar interface, and wherein the at least one measuring channel is configured in the fiat or planar interface.

A Discrete Sample Introduction Module (DSIM) apparatus includes an internal tubing system to receive into the DSIM apparatus a discrete gas sample having a received concentration. A plurality of valves selectively partitions the internal tubing system to form a plurality of loops corresponding to a plurality of loop volumes to contain the discrete gas sample. The plurality of loop volumes receives a carrier gas to dilute the discrete gas sample to a plurality of preselected dilutions. The DSIM apparatus circulates a given one of the plurality of preselected dilutions for analysis by a spectrometer coupled to the DSIM apparatus.

A verification system includes a reference gas supply part that supplies reference gas in place of exhaust gas and is configured to be able to verify the consistency between a supply amount of the reference gas from the reference gas supply part and a measured value of the reference gas measured by an analyzer. The verification system further includes a control part that receives a setting flow rate signal that is a signal indicating a setting flow rate and an analysis range signal that is a signal indicating an analysis range of the analyzer, calculates a target supply amount of the reference gas on the basis of the setting flow rate and the analysis range indicated by the respective signals, and controls the reference gas supply part so as to make the reference gas supply amount by the reference gas supply part equal to the target supply amount.

A gas phase standard preparation device and method of use for creating a final reference material is disclosed. The final reference material is used to quantitate certain gaseous compounds in collected air samples. This is accomplished by providing a sealed ampule tube with an ampule containing reference material that is eventually breached by the gas preparation device. Once the ampule is breached, the reference material within the ampule is blended with a diluent gas and forced into a reference material cylinder. The concentration of the final reference material within the reference material cylinder can then be verified for use in testing collected air samples. Accordingly, this device allows for creating a custom final reference material onsite in a laboratory without the need for shipping in pre-made compressed gas cylinders for air quality testing.