A VOC detecting and warning method is provided. Firstly, an actuating-and-sensing module having a gas transportation actuator and a gas sensor is provided. Then, the gas transportation actuator guides a specified amount of gas to the gas sensor for obtaining plural monitored values, each of which is generated according to a result of detecting volatile organic compounds of the gas in each monitoring time interval by the gas sensor. All the monitored values obtained in a unit time period are added together, so that an accumulated comparison value is obtained. If the accumulated comparison value is determined greater than an injury threshold defined according to the VOC inhalation amount affecting the health of a human body, the actuating-and-sensing module issues a warning notification to notify the user to take protective measures.

System, device and method for detecting, measuring and monitoring chemical concentrations or analytes in insect colonies and agricultural environments.

An interior ventilation system for a motor vehicle includes an air measurement chamber, into which outdoor air of the motor vehicle can be fed via an outside air supply line and vehicle interior air of the motor vehicle can be fed via an inside air supply line, air quality sensors for measuring a harmful-substance content in air located in the air measurement chamber, and a measurement air control unit, which is designed to selectively supply outdoor air and/or vehicle interior air to the air measurement chamber. A motor vehicle includes such an interior ventilation system.

A method that includes obtaining a sensor reading from a sensor installed inside an underground vault and determining whether the sensor reading is indicative of an alarm state. When the sensor reading is indicative of the alarm state, the method obtains at least one new reading and determines whether the sensor reading includes sensor drift based at least in part on the at least one new reading. The alarm state is established when the sensor reading is determined not to include sensor drift. The sensor drift is removed when the sensor reading is determined to include sensor drift.

Disclosed are various embodiments for determining whether food in a refrigerator has spoiled. In one embodiment, a refrigerator includes a compartment that has an interior space configured to contain a food item. A chemical sensor can be mounted within an interior of the refrigerator. The chemical sensor can be configured to at least measure an amount of a chemical related to spoilage of the food item in the compartment.

Embodiments of a sensor device, method and system employ a multiplicity of environmental sensors as a single monitoring and alerting mechanism, operable to provide a profile of any contaminant in terms of various gases and particles in the atmosphere, quantified in terms of relative concentrations. In various embodiments, the sensor device can comprise hardware and firmware elements, including an electronic control system, a case, a shield and a cover. The environmental sensors can be secured as part of the electronic control system and the shield can be formed so as to facilitate proper channeling of air and sound for effective operation.

A health early warning system for passengers on a train in an outdoor air polluted environment and a method thereof are provided. The system comprises an air quality monitoring station data acquisition module, a train data acquisition module, a train air pollution prediction module, and a train air environment early warning module; the air quality monitoring station data acquisition module acquires data of air quality monitoring stations and uploads the data to the train air pollution prediction module; the train data acquisition module acquires data of the train and uploads the data to the train air pollution prediction module; the train air pollution prediction module performs short-term prediction on air pollution of the train and uploads a result of the short-term prediction to the train air environment early warning module; and the train air environment early warning module performs early warning on the health of the passengers on the train.

A gas sensing device includes one or more chemo-resistive gas sensors; one or more heat sources, wherein the gas sensors are heated according to one or more first temperature profiles during the recovery phases and according to one or more second temperature profiles during the sense phases; a preprocessing processor for generating preprocessed signal samples; a feature extraction processor for extracting one or more feature values from the received preprocessed signal samples; and a gas concentration processor for creating a sensing result, wherein the gas concentration processor includes a classification processor for outputting a class decision value, wherein the classification processor is configured for outputting a confidence value, wherein the classification processor includes a first trained model based algorithm processor, wherein the gas concentration processor comprises a quantification processor for creating an estimation value, and wherein the quantification processor comprises a second trained model based algorithm processor.

A power relay is controlled by the presence of Volatile Organic Compounds that are often emitted by outgassing from electronic components during overheat and failure conditions. The relay housing contains a standard power relay of single pole single throw (SPST) or a multi-pole double throw relay depending on the application. A micro VOC integrated circuit is placed within the housing allowing access to ambient air through ports in the side of the relay. Air quality is sampled periodically or continuously as is required by the system to adequately monitor for fault events and, in the event of a fault, latch the relay mechanism OPEN breaking the flow of electrical energy the circuit downstream.

In some examples, a computing device is configured to monitor an air quality of a vehicle cabin by at least receiving, from a plurality of remote sensors distributed throughout the cabin, signals indicative of one or more air quality parameters for air in the cabin. Based on the received signals, the computing device can determine if values for the one or more air quality parameters are indicative of an air quality event and generate an output in response to such a determination. The output may include, for example, an audio or visual indication of the air quality event or a signal to control another system of the aircraft to take action to remedy the air quality event.