An air quality monitor includes a housing defining an inlet and an outlet, a fan, and one or more sensors disposed in the housing. The fan is configured to transport air along a nonlinear flow path from the inlet of the housing to the outlet of the housing. The one or more sensors are arranged along the nonlinear flow path and include a first sensor positioned upstream of the fan and a second sensor positioned downstream of the fan. The first sensor is configured to sense a first parameter of the air and the second sensor is configured to sense a second parameter of the air.

An odor evaluation device according to the present invention includes a gas recovery unit, and a cleaning gas supply unit. The gas recovery unit includes an inlet port configured to introduce a sample gas containing odor components, an outlet port configured to detachably mount a sample bag for recovering the sample gas, a flow path connecting the inlet port and the outlet port, and a switching valve arranged in the flow path to open and close the outlet port. The cleaning gas supply unit is configured to supply a cleaning gas from an upstream side of the switching valve toward the outlet port in a state in which the sample bag is not mounted on the outlet port and the switching valve is opened.

A gas sensor and methods for producing the same are disclosed. The gas sensor of the present disclosure includes a bulk silicon layer, comprising a controllable inversion layer, an oxide layer on top of the bulk silicon layer, wherein the controllable inversion layer is located at an interface of the bulk silicon layer and the oxide layer, and a sensing layer on the oxide layer, wherein a sensitivity of the sensing layer is a function the controllable inversion layer.

Systems and methods of preventing an event occurrence or mitigating effects of an event occurrence in an industrial facility are disclosed herein. In some embodiments, a first input is received from a first sensor and, based at least in part on the first input, an initial action is automatically generated. In response to the initial action, a second input is received from a second sensor and, based at least in part of the received first and second inputs, a likelihood of an event occurrence is determined. Based at least in part of the determined likelihood, a remedial action configured to prevent the occurrence of the event occurrence is automatically generated. In some embodiments, the remedial action is generated in real-time and can be directed to a process condition, environmental condition, or secondary source.

A sensor for detecting at least one property of a fluid medium in at least one measuring chamber, for detecting an H.sub.2 fraction in a measuring gas. The sensor includes at least a first sensor element to detect a heat conductivity of the fluid medium and output a first measuring signal, a second sensor element including a semiconducting metal oxide and designed to output a second measuring signal, a third sensor element for detecting a physical property of the fluid medium, the third sensor element differing from the first sensor element and the second sensor element with regard to the detected physical property and being designed to output a third measuring signal, and an electronic evaluation unit for evaluating the first, second, and third measuring signal. The electronic evaluation unit is designed to change operating parameters of the first and/or second and/or third sensor element.

System and method for estimating how an atmospheric gas is distributed. A server receives prior data related to historical and/or theoretical global patterns of the gas, as well as measurements of the concentration and/or emission of the gas. The server passes the data and measurements to a database for storage and/or to at least one processor, which applies statistical inference methods to estimate a probability distribution of gas concentration and emission within the region. In one embodiment, the entire atmosphere is divided into numerous regions, and gas distributions are evaluated in each region, to thereby produce an estimated distribution covering the atmosphere. In some embodiments, the regions are divisions of an equirectangular projection of the Earth's surface and have a length and width of 0.025°.

A dual heater gas sensor module according to an embodiment of the present invention comprises: a housing having a front side and a back side which are partially open and forming the exterior of the dual heater gas sensor module; a first gas sensor for heating the air flowing in through the front side of the housing; and a second gas sensor for measuring a specific gas contained in the air discharging through the backside of the housing, wherein the first gas sensor is located in a first region, the second gas sensor is located in a second region that is higher than the first region, and the first region and the second region may be connected by an inclined plane.

A sensor device, a method for operating a sensor device and an electronic assembly comprising a sensor device are disclosed. In an embodiment a sensor device includes a first sensor unit and a second sensor unit in a common housing, wherein each of the first and second sensor units comprises a heater element and a temperature sensor element, wherein the housing comprises a cover element having an opening, the cover element covering the first sensor unit, and wherein the opening is arranged over the second sensor unit.

A smoke and temperature detection system includes a plurality of fiber optic cables terminating in a plurality of nodes positioned to monitor a fire or smoke condition at one or more protected spaces, and a temperature detection fiber optic cable having a plurality of fiber Bragg gratings arrayed along the temperature detection fiber optic cable. A control system is operably connected to the plurality of fiber optic cables and to the temperature detection fiber optic cable. The control system includes a first light sensitive device configured to receive a scattered light signal from the plurality of fiber optic cables, and a second light sensitive device configured to receive a reflected light signal from the fiber Bragg gratings. The control system is configured to detect a temperature at the fiber Bragg gratings based on one or more properties of the reflected light signal received at the second light sensitive device.

A system for analysis of at least one analyte gas present in an insulating fluid of an electrical transformer includes a gas sensor in operational contact with at least one analyte gas from an insulating fluid to provide multiple responses from the sensor. One or more processors are configured to receive the multiple responses during exposure of the sensor to the analyte gas from the insulating fluid representative of a concentration of the analyte gas present in the insulating fluid. The processors are configured to select one or more responses of the multiple responses that provide rejection of interfering gases, resolution between gases, improved low detection range of the analyte gas, improved high detection range of the analyte gas, improved response linearity of the analyte gas, improved dynamic range of measurements of the analyte gas, or one or more combinations thereof compared to non-selected responses from the sensor.