Oxy-pyrohydrolysis articles, systems and methods for total halogen, in particular fluorine analysis are provided. A sample containing halogen elements is provided into a pyrotube for combustion. A combustion-enhancing bed including ceramic fibers or fabrics is disposed inside the pyrotube to enhance the combustion and protect the pyrotube from damage by corrosive gases.

Processes, compositions, and sensors for sensing a variety of toxic chemicals based on colorimetric changes. Exemplary process for sensing a toxic chemical includes contacting a toxic chemical, or byproduct thereof, with a sorbent that includes a porous metal hydroxide or a porous mixed-metal oxide/hydroxide and a transition metal reactant suitable to react with a toxic chemical or byproduct thereof. The sorbent is contacted with the toxic chemical or byproduct thereof for a sampling time. A difference between a post-exposure colorimetric state of the sorbent and a pre-exposure colorimetric state of the sorbent is determined to thereby detect exposure to, or the presence of, the toxic chemical or byproduct thereof.

A sensor product for detecting an analyte or condition. The sensor product having a body and a circuit integrated with the body. The circuit including an electric power source, a sensing element comprising graphene or a graphene derivative in which the sensing element is configured to undergo a change in an electrical property in the presence of an analyte or condition, and an indicator configured to display information indicating the presence of the analyte or condition when the change in an electrical property of the sensing element occurs. For instance, the indicator may display DANGER EVACUATE in the presence of chlorine gas, elevated temperatures, or other analytes or conditions.

Various embodiments are directed to a method of utilizing an imaging system for detecting a greenhouse gas such as sulfur hexafluoride. The method may include (1) generating, by a first thermal camera coupled to a robotic platform, a static image of a scene utilizing a first spectral filter for passing wavelengths within an SF6 absorption range, (2) generating, by a second thermal camera coupled to the robotic platform, an additional static image of the scene utilizing a second spectral filter for passing wavelengths outside of the SF6 absorption range, and (3) detecting the presence of SF6 in the scene based, at least in part, on the static image, the additional static image, and a difference between the static image and the additional static image.

The present invention relates to a sensor element for detecting hydrogen chloride (HCl) gas, a sensor device having the sensor element, and a method of manufacturing the sensor element, wherein the sensor element includes: an ionic layer including a Ag ion obtained through ionization; an ion conductive layer, in which the Ag ion is conducted, the ion conductive layer being formed on the ionic layer; and a reactive layer, in which the Ag ion conducted from the ion conductive layer and HCl gas react with each other, the reactive layer being formed on the ion conductive layer. The sensor element detects HCl gas generated from insulting materials when fire occurs, thereby detecting an electrical fire and preventing gas and fire spreading.

A halogen gas removing agent for removing halogen gas from a gas flow, which reduces the risk of leakage of the halogen gas exhausted from a semiconductor production process by treating the gas flow with the removing agent and a process for producing the removing agent. Also provided are an apparatus for removing the halogen gas using the removing agent, and a method for monitoring the state of consumption of the halogen gas. The halogen gas removing agent includes an inorganic compound base material, a sulfur-containing reducing compound and a color indicator, preferably using a pseudoboehmite as the base material, adding a pH indicator having a transition range in a pH range of 3 to 8 as the color indicator, and adding a basic metal compound such as zinc oxide.

Provided are processes for the sensitive detection of the presence of, absence of, and optionally the identity of, one or more chemical agents. The processes use the binding of chemical agents to a metal organic framework or metal oxide/hydroxide electrically connected to a pair of electrodes to detect low levels of chemical in a sample. By exposing the surface of the metal organic framework or the surface of the metal oxide/hydroxide to the chemicals and then measuring changes in impedance magnitude and/or phase shift through electrical impedance spectroscopy, the presence of a chemical agent is readily detected.

An apparatus including: a housing configured for installation in a landfill; a differential pressure sensor and at least one gas sensor in the housing; and a first valve configured to control landfill gas (LFG) flow to the at least one gas sensor, wherein the first valve is configured to open when the differential pressure sensor detects a selected pressure difference or pressure difference change between the atmospheric air pressure and the LFG pressure.

A distributed chemical sensor using an optical fiber having a cladding containing an indicator dye complexed with a heavy metal salt whereby the dye is rendered inactive and the heavy metal salt is preferentially functional to complex with a fluoride ion by cleaving from the dye.

The present invention relates to a sensor element for detecting hydrogen chloride (HCl) gas, a sensor device having the sensor element, and a method of manufacturing the sensor element, wherein s the sensor element includes: an ionic layer including a Ag ion obtained through ionization; an ion conductive layer, in which the Ag ion is conducted, the ion conductive layer being formed on the ionic layer; and a reactive layer, in which the Ag ion conducted from the ion conductive layer and HCl gas react with each other, the reactive layer being formed on the ion conductive layer. The sensor element detects HCl gas generated from insulting materials when fire occurs, thereby detecting an electrical fire and preventing gas and fire spreading.