A gas detector is tested by releasing detectable gas from a storage medium and delivering it to the gas detector. A cartridge for delivering detectable gas includes a container with an outlet and a storage medium in the container. Detectable gas is stored in the storage medium for being desorbed from the storage medium. A test device can include a receptacle for receiving the cartridge, an interface for fluidly coupling the device to a gas detector, and passaging to provide fluid communication between the interface and both the cartridge received in the receptacle and external air. A pump can pump external air and the detectable gas released from the cartridge through the passaging and interface such that the pumped detectable gas and air form a proportioned mixture for testing the gas detector.

An in-vehicle exhaust gas analysis system, which is provided with a flowmeter, and an exhaust gas analyzer to analyze a concentration of a measurement target component contained in exhaust gas, includes a standard gas supply mechanism to supply a standard gas containing a predetermined component to the flowmeter and the exhaust gas analyzer. The system is configured to include a detected mass calculation section to calculate a detected mass of a predetermined component by using a flow rate obtained by the flowmeter and a concentration of the predetermined component obtained by the exhaust gas analyzer, a supply mass acquisition section to acquire a supply mass of the predetermined component supplied from the standard gas supply mechanism to the flowmeter and the exhaust gas analyzer, and a mass comparison section to compare a detected mass calculated by the mass calculation section and a supply mass acquired by the supply mass acquisition section.

A device (1) includes a pumping device (7) and a control unit (70) and is configured to test the operational capability of a gas guide element (3) in a gas-measuring system (11) that includes a gas sensor (5). The control unit (70) carries out steps with two operating states including delivering a test gas (91) by the pumping device (7) through the gas guide element (3) to a remote measuring location (80) and is subsequently delivered from the measuring location (80) to the gas sensor (5). Measured values of a gas concentration are detected by the gas sensor (5) during the delivery from the remotely located measuring location (80) to the gas sensor (5) and analyzed to determine whether changes occurring in the detected gas concentration during the delivery from the measuring location (80) to the gas sensor (5) indicate whether the gas guide element (3) is capable of operating.

A method for testing a gas sensor is based on a gas-measuring system with a test gas source and with a pumping device. A predefined quantity of a gas or of a gas mixture is fed in, from the test gas source, to the gas sensor over a predefined time and metered. The response of a measured signal of the gas sensor is determined as a sensor response. Characteristic variables, from which an indicator of the ability of the gas sensor to operate is determined, are determined from the sensor response.

A multi-point air sampling system that can use a field reference subsystem to process sensor feedback to efficiently and reliably monitor and improve air quality within a space. The field reference subsystem can interface with multiple types of multi-point air sampling systems to ensure that sensors are operational and producing accurate measurements. Included within the field reference subsystem can be one or more permeation sources for generating test gases used to evaluate the integrity of the sensors, a processor for receiving the results of the test-gas evaluations to recurrently verify the operation level of each sensor, and a reporting system for carrying out actions in response to the recurrent verification of the sensors.

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 method for operating a test station (10) for portable gas-measuring devices (20) is provided. The gas-measuring device (20) is arranged in fluid-communication with the test station (10) via at least one interface (13). A flow time is set, during which the test gas (30) is fed and a waiting time is set, during which no test gas (30) is fed. After an end of the feed of the at least one test gas results of the test are analyzed. The test station (10) is configured for feeding at least one test gas (30) to the interface (13). The test station (10) for portable gas-measuring devices (20) has at least one interface (13) for the fluid-communicating arrangement of the gas-measuring device (20), and wherein the test station (10) is configured for feeding at least one test gas (30) to the interface (13).

A method for testing a gas sensor (5) is based on a gas-measuring system (1) with a test gas source (8) and with a pumping device (9). A predefined quantity of a gas or of a gas mixture is fed in, from the test gas source (8), to the gas sensor (5) over a predefined time and metered. The response of a measured signal (51) of the gas sensor is determined as a sensor response. Characteristic variables, from which an indicator of the ability of the gas sensor (5) to operate is determined, are determined from the sensor response.

Despite the desire to measure the composition and concentration of the microparticles included in a gaseous body sample serving as the measurement target, there is a problem that measurement cannot be performed accurately due to the effect of substances other than the gaseous body sample adsorbing to a trapping body of the analyzing apparatus that traps the microparticles, for example. Therefore, provided is a microparticle composition analyzing apparatus that analyzes composition of microparticles contained in a gaseous body sample, comprising a gas analyzer and a control section that sequentially introduces into the gas analyzer a comparative gas and a sample gas caused by the microparticles generated by irradiating the gaseous body sample with a laser.

Embodiments relate generally to a gas detector test fixture that recycles test gas. A portable gas detector test fixture, comprises a test chamber, a processor, a docking connector communicatively coupled to the processor, an output device communicatively coupled to the processor, a memory communicatively coupled to the processor, and an application stored in the memory that, when executed by the processor, is configured to conduct a bump test on a portable gas detector plugged into the docking connector and to output the bump test result to the output device. The test fixture further comprises an inflow line configured to connect to a test gas supply line of a test gas container, where the inflow line is coupled to the test chamber, and an outflow line configured to connect to a test gas return line of the test gas container, where the outflow line is coupled to the test chamber.