A system for testing alcohol breath analyzers, wherein the system comprises an alcohol breath gas generation device, a test chamber, a reference measuring device, a control and registration unit, and a distribution unit. The invention also relates to methods of testing alcohol breath analyzers.

A method for using a chemical capture system with integrated calibration having a chamber which comprises an opening and a closing member, as well as a chemical sensor to be calibrated and a photoionization sensor which are positioned in the chamber, in which method: —during a measurement step, the sensor to be calibrated and the photoionization sensor measure the gas mixture present in the chamber, defining an open interior space, so as to identify the gas mixture and —during a calibration step, the photoionization sensor generates ozone by photoionizing the dioxygen in the chamber, defining a closed interior space free of gas mixture, and the sensor to be calibrated measures the generated ozone, the difference between said measurement and a reference measurement making it possible to calibrate said sensor.

The present application discloses a dehumidifier and a dehumidification system. The dehumidifier comprises a housing and a water absorber located in the housing. An opening and a plug are provided at a lower portion of the housing. The plug is used to seal the opening, and the water absorber can be removed via the opening when the opening is open. A conduit is provided above the housing, an upper gas inlet and an upper gas outlet are provided on the conduit, a gas to be dehumidified enters the conduit via the upper gas inlet and is discharged from the conduit via the upper gas outlet, and the water absorber is used to absorb water in the gas. The dehumidifier according to the present application is easily maintainable.

A gas detection system includes a gas sensor, and a filter unit. The gas sensor is configured to detect detection target molecules. The filter unit is disposed at a reference gas supply passage. The reference gas supply passage connects a reference gas inlet port from which a reference gas is introduced, and a sensor chamber in which the gas sensor is housed. The filter unit includes at least a first filter configured to reduce the detection target molecules in the reference gas, and a second filter configured to reduce moisture in the reference gas. Each of the first filter and the second filter has a separation membrane including hollow fibers.

A system and method for testing a gas sensor with a test gas and that recovers the test gas after testing. The test gas is stored in a test gas source, and delivered to the gas sensor through a supply circuit. After the test is completed, gas is withdrawn from the supply circuit into a recycle circuit. A compressor in the recycle circuit pulls the test gas into the recycle circuit, pressurizes the test gas and discharges the pressurized test gas back into the test gas source. Valves are in the supply and recycle circuits, which when selectively opened and closed changes between testing and recycle configurations. The recycle flow is filtered to prevent air and other non-test gas substances from being introduced into the test gas source.

Provided is a gas sensor and methods of monitoring the same. The gas sensor may detect gas restrictions within the gas sensor. The gas sensor may include a test gas diffusion path allowing for monitoring of restrictions within the gas sensor. A pulse of test gas may be electrochemically generated into a void disposed between the membrane and capillary of the gas sensor. The resulting transient signal on the sensing electrode may be analyzed to determine the degree of restriction present in the gas sensor.

An inspection apparatus capable of performing responsivity inspection on a plurality of gas sensors at equivalent accuracies is provided. The inspection apparatus includes a plurality of inspected sensor disposing parts that are provided halfway through one gas flow path at equal intervals in an extending direction of the flow path and in each of which a gas sensor to be inspected is disposed, and a plurality of straightening plates provided upstream of each of the inspected sensor disposing parts on the gas flow path and separated at a constant distance from the inspected sensor disposing parts. The straightening plates each include a rectangular opening orthogonal to the gas flow path and open to the gas flow path. When the gas flow path extends in one direction in a horizontal plane, the opening has a longitudinal direction along a direction orthogonal to the one direction in the horizontal plane.

A method for testing a gas sensor (30) and a gas-measuring device with a testing device for testing the gas sensor (30) make possible an improved analysis and evaluation of states of gas sensors (30). Due to the testing of a gas admission element (8) by monitoring measured signals (35, 38) in a time course (400) and a comparison with threshold values (350, 351) at predefined times (403, 404), (403″, 404″) in conjunction with the dispensing (91) of a quantity of test substance (5, 6), it is possible to test whether a gas supply (7) to the gas sensor (30, 309) is possible and given.

A method for testing a gas sensor and a gas-measuring device with a testing device for testing the gas sensor provides an improved analysis and evaluation of states of gas sensors. Due to a testing of a gas admission element, by monitoring measuring signals (35, (38) in a time course (400) in conjunction with dispensing (91, 91′, 91″) a quantity of test substance, it is made possible to check whether a gas supply to the gas sensor is possible (to check if the gas diffusion path is open) and given.

A method for testing a gas sensor and a gas-measuring device with a testing device for testing the gas sensor provides an improved analysis and evaluation of states of gas sensors. Due to a testing of a gas admission element, by monitoring measuring signals (35, (38) in a time course (400) in conjunction with dispensing (91, 91′, 91″) a quantity of test substance, it is made possible to check whether a gas supply to the gas sensor is possible (to check if the gas diffusion path is open) and given.