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.

Devices and techniques related to landfill gas extraction are disclosed. A technique for controlling extraction of landfill gas from a landfill through a gas extraction system is described. The method may include measuring a plurality of values indicating conditions associated with the landfill; computing, based at least in part on the plurality of values and on a model of the landfill, a predicted future state of the landfill; determining, based at least in part on the predicted future state of the landfill, one or more control parameters for one or more respective control devices configured to control operation of the gas extraction system; applying the one or more control parameters to the one or more respective control, and with the one or more control devices, controlling extraction of the landfill gas from the landfill based, at least in part, on the one or more respective control parameters.

A system for detecting mold includes a housing defining a chamber and an opening through a surface. The system includes a movable grate for selectively covering the opening. The system includes a substrate treated to promote mold growth. The system includes a mechanism for moving the substrate to move previously unexposed portions into the chamber. The system includes a thermal control system to maintain predetermined environmental conditions in the chamber. The system includes a sensor configured to detect mold growth in the chamber. The system includes a mold suppressor to kill mold in the chamber when activated. The system includes a controller to coordinate operation of the components to detect mold growth in an environment.

Systems and methods for reporting health status for a plurality of computing devices such as within a data center are disclosed. A management device connected to the computing devices via a network executes a management application that periodically requests and receives status data from the computing devices. A pool checker may be used to track corresponding pool status data, and an environment checker may periodically request and receive environmental data from environmental sensors for temperature, humidity, and audio. A report generator creates health reports and assigns device health classifications based on the device status data, the environmental data, and the pool health data. The data may be associated with one or more locations and customers, permitting filtering of the report.

A portable electronic device for use in different orientations includes a signal control module, a key control module, an information display module, and a position detection module. The key control module includes a plurality of functional switches and functional keys. The signal control module has a plurality of key function execution commands respectively corresponding to the functional keys. The position detection module is configured for detecting a placement orientation of the portable electronic device. When the portable electronic device is rotated to change the placement orientation of the information display module, a screen orientation of an information display image provided by the information display module is changed following a change of the placement orientation of the information display module, and a corresponding relationship between the functional switch and the key function execution command is changed following the change of the placement orientation of the information display module.

The invention relates to a personal sensing device (1A, 1B) to be worn by a person (2A, 2B) on a site (3), comprising: a gas sensor (4) for measuring a gas concentration of a gas; a communication system (5) for communicating an alarm/event or operational condition, such as the gas concentration, to a computer system (6), wherein the computer system (6) is arranged for processing the communicated alarm/event and/or triggering an alarm/response in response to the communication of the operational condition, for instance when the computer system determines that the gas concentration exceeds a pre-determined limit; characterised in that the computer system (6) is configured for distribution, preferably intelligent distribution, of one or more alarm/event instructions in response to the alarm/event or operational condition.

A method of indicating the presence of a target gas in a gas volume comprising providing a gas sensing core, configured for detection of the target gas, and a condition sensor within the gas volume, providing a controller, allowing gas to fluidly interact with the gas sensing core, monitoring a target gas measurement output from the gas sensing core, monitoring a parameter output from the condition sensor, recording a parameter output minimum value, calculating a parameter difference, calculating a rate of change of the parameter with respect to time, and indicating the presence of a target gas is detected in the gas volume when the target gas measurement exceeds a target gas measurement threshold value and the parameter difference is less than a parameter difference threshold value.

A method of operating a gas sensing device is described. The method includes receiving a signal indicative of a value of resistance of a gas sensing element, processing the signal received to compute a value of a gas concentration, performing a comparison of the value of gas concentration to a threshold, and, based on the outcome of a diagnosis procedure, setting the device to an alert signal issue state as a function of the outcome of the comparison. The diagnosis procedure includes computing a set of parameters indicative of the state of the gas sensor circuit, and classifying the gas sensor circuit in one of a first, a second and a third class based on the parameters.

Numerous embodiments of a gas sensor and associated methods are described. In one embodiment, a gas sensor comprises a single wire. The resistance of the wire is measured for different temperatures, or the current through the wire or the voltage across the wire is measured for a constant temperature, and a profile for the surrounding gases is generated, enabling the surrounding gases to be identified. In another embodiment, a gas sensor comprises a first wire and a second wire in close proximity, where the first wire is used to generate temperature conditions, and the resistance of the second wire is measured for the different temperature conditions, or the current through the wire or the voltage across the wire is measured for a constant temperature. A profile for the surrounding gases is generated, enabling the surrounding gases to be identified.

A system for mitigating thermal runaway in a battery-powered electric vehicle (EV). The system includes a gas sensor configured to measure a level of at least one type of gas in a vicinity of a battery of the EV, a thermal event detector configured to determine, based on the measured level of the at least one type of gas, that the battery is experiencing out-gassing, and a communications interface configured to transmit an alert to a fleet management system regarding the out-gassing of the battery. The fleet management system alters an assignment of the EV in response to the out-gassing of the battery.