A system including one or more gas sensor assemblies having one or more gas sensors. The gas sensor is for sensing a preselected gas. The gas sensor assembly includes a housing with a cavity therein, and the sensor is mounted on the housing so that the sensor is able to detect the preselected gas in the cavity. The gas sensor assembly includes a sensor control module in communication with the gas sensor, and also in communication with a central controller. Via the central controller, the sensor may be tested using a purge gas, and the sensor may be zeroed if necessary. Also, via the central controller, the sensor may be calibrated using a calibration gas mixture having the preselected gas in a known concentration. The central controller is configured for manual or automatic testing and calibration. Accordingly, the testing and calibration, whether manual or automatic, is done remotely.

A method for operating a gas sensor system comprising a gas sensor, in order to provide a concentration variable of a gas concentration of a gas component in a sample gas. The method includes: measuring the gas concentration during a measurement process in order to obtain a temporal evolution of a sensor signal as a function of the gas concentration; determining the concentration variable using a data-based sensor model as a function of the temporal evolution of the sensor signal, the data-based sensor model being trained to take into account a behavior of the sensor outside the measurement process in order to ascertain the concentration variable.

There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, the mixture being pressurised to a level which is above local atmospheric pressure. The method comprises the steps of positioning a gas analysis sensor (14) within a pressure vessel (10); exposing the sensor to the mixture of gasses at the pressure level found in the pressure vessel; operating the sensor to measure the actual partial pressure of the at least one gas in the mixture contained in the vessel; and periodically calibrating the sensor by directing a calibrating gas mixture (20, 22) to the sensor in the chamber, the calibrating gas mixture being breathable by a human being.

The invention relates to a device and to a method for continuously measuring the hydrogen sulfide concentration of an off-gas by means of a detachable device suitable for being temporarily connected to equipment producing the off-gas. The method comprises a step of measuring the absorption of electromagnetic radiation by the off-gas. The device and method method can be used in particular to measure the hydrogen sulfide concentration in an off-gas produced during a step of sulfiding a hydroprocessing catalyst.

Disclosed is a method for calibrating a sensor to be calibrated by means of a reference sensor, the sensor to be calibrated being configured to determine a chemical signal based on a conversion function for converting an electrical signal, the reference sensor being configured to determine a reference signal, the method having: ⋅ measuring, during a reference time period, a first chemical signal (S1P1) and a first reference signal (S2P1) and, during a test period, a second chemical signal (S1P2) and a second reference signal (S2P2), determining regression functions (gP1, gP2) defined as follows: S2P1=gP1(S1P1) and S2P2=gP2(S2P2), calculating a difference between the regression functions (gP1, gP2) and ⋅ when the difference is greater than a reference difference, determining an optimized conversion function.

A device for providing a calibration fluid, in particular a nitrogen oxide, for calibrating a respiratory gas analysis device, includes a first interface for connecting a chamber of the device to a measurement path of the respiratory gas analysis device, a first opening for introducing a reactant carrier with a first reactant into the chamber, and a contact element. The contact element is arranged in the chamber relative to the first opening such that when the reactant carrier is introduced, a contact of the contact element with the reactant carrier is facilitated in order to trigger a chemical reaction of the first reactant so as to generate the calibration fluid. The disclosure further relates to a system, a reactant carrier, and a method for providing a calibration fluid for calibrating a respiratory gas analysis device.

A method of detecting gas includes determining and storing, by a controller, a zero level of a photoionization detector using ambient air inflow when an ultraviolet lamp is in a turned OFF state, wherein the stored zero level is based on an ambient temperature; sampling, by the controller, an output of a detector electrode of the photoionization detector when the ultraviolet lamp is in a turned ON state; and comparing the sampled output of the detector electrode to the stored zero level to determine if a threshold concentration of a gas is present.

Multiple low cost individual sensors communicate with a server. A proxy sensor communicates with the server. The server periodically compares information from the individual sensors with information from the proxy sensor. The server validates and accepts information from individual sensors. The server changes gain and offset values for individual sensors providing information that is not validated by the comparing.

A gas monitor configured to monitor at least one target gas in an environmental mixture, by separating and concentrating the target gas and then adjusting for the concentration factor. The adjustment may also take into account sensor sensitivities to other gases. Methods for adjustment of target gas results and increasing accuracy of monitoring are described.

Embodiments of the present disclosure relate to apparatus, systems, and methods for detection and differentiation of selected hydrocarbon gases in a target gas composition. The apparatus comprises a sensing unit; a housing comprising a first housing portion and a second housing portion, the first housing portion for receiving a linear actuator, the linear actuator operatively coupleable to the sensing unit proximal to the inlet, and the second housing portion for receiving at least a portion of the inlet end of the sensing unit and comprising at least one chamber and a closure member housed within the second housing portion and adjacent the inlet, the closure member actuatable between a closed state and an open state by the linear actuator; wherein the at least one chamber is in fluid communication with the inlet when the closure member is in the open state.