A gas analyzer includes an oxidation device and a subsequent photometer, wherein the oxidation device has a reaction chamber located in an exhaust gas path and a heating chamber downstream thereof, where an ultraviolet light source generates ozone from residual oxygen content of the exhaust gas within the reaction chamber to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas, nitrogen oxides and excess ozone are broken down into nitrogen dioxide and oxygen in the heating chamber, the photometer outputs the measured nitrogen dioxide concentration as nitrogen oxide concentration of the untreated exhaust gas, and where an additional photometer is located in the exhaust gas path between the reaction chamber and the heating chamber which, via light absorption, measures the ozone concentration in the partially treated exhaust gas and outputs the same as oxygen concentration of the untreated exhaust gas.

Disclosed is a method for predicting corrosion and spontaneous combustion of sulfur-related petrochemical equipment. The method solves the issues in the existing techniques that includes narrow predicting range, high workload in installation and maintenance, and time lag in predicting corrosion and spontaneous combustion inside equipment. The method comprises a step of a dual index system prediction, which includes a step of monitoring a temperature and a step of detecting SO.sub.2 gas generated by spontaneous combustion. The time when spontaneous combustion occurs can be accurately calculated by using a fitted quantitative relationship formula generated by the spontaneous combustion of corrosion products. The method has a low Labor cost. The method has a low labor cost and, does not require on-site gas detection to be carried out by means of manual detection, which both reduces the cost and ensures the detection accuracy.

A system for the maritime shipping industry to aid enforcement of the Sulfur Dioxide (SO.sub.2) exhaust emissions regulations which uses neural networks and a novel sampling process to detect and record compliant operation of a ship regarding the fuel switching aspect of the regulation. The processing load of neural network training can be distributed over multiple identical self-contained, self-powered, self-communicating sensor units on each of the monitored ships.

A system and method for determining impurities in a beverage grade gas such as CO.sub.2 or N.sub.2 relies on a coupling of FTIR analysis and UV fluorescence detection. Conversion of reduced sulphur present in some impurities to SO.sub.2 can be conducted using a furnace. In some cases, CO.sub.2% also is determined.

The present specification relates to an organic transistor including an organic semiconductor layer including a compound, and a gas sensor to which the organic transistor is applied.

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.

An electronic central unit is configured to control a voltage application device to execute applied voltage sweep and obtain an output current that flows between a first electrode and a second electrode of an electrochemical cell. The electronic control unit is configured to detect either one of presence or absence of sulfur oxides in a specified concentration or higher in exhaust gas and a concentration of sulfur oxides in the exhaust gas based on the output current. The electronic control unit is configured to execute one of a specified determination and a specified detection based on a specified parameter. Accordingly, it is possible to accurately determine the presence or the absence of sulfur oxides in the specified concentration or higher that are contained in exhaust gas or detect the concentration of sulfur oxides in the exhaust gas.

A gas analyzer includes an oxidation device and a subsequent photometer, wherein the oxidation device has a reaction chamber located in an exhaust gas path and a heating chamber downstream thereof, where an ultraviolet light source generates ozone from residual oxygen content of the exhaust gas within the reaction chamber to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas, nitrogen oxides and excess ozone are broken down into nitrogen dioxide and oxygen in the heating chamber, the photometer outputs the measured nitrogen dioxide concentration as nitrogen oxide concentration of the untreated exhaust gas, and where an additional photometer is located in the exhaust gas path between the reaction chamber and the heating chamber which, via light absorption, measures the ozone concentration in the partially treated exhaust gas and outputs the same as oxygen concentration of the untreated exhaust gas.

A gas detection device includes: an element portion; a voltage applying unit configured to apply a voltage across a first electrode and a second electrode on surfaces of a solid electrolyte; a current detecting unit configured to detect an output current flowing between the first electrode and the second electrode; and a measurement control unit. The measurement control unit acquires a parameter which has a correlation with a degree of change of the output current increasing as a concentration of sulfur oxides in an exhaust gas increases based on the output current, and performs determination of whether the concentration of sulfur oxides in the exhaust gas is equal to or higher than a predetermined value or detection of the concentration of sulfur oxides in the exhaust gas based on the acquired parameter.

A gas detection device includes a temperature control part configured to detect an element impedance by applying a high frequency voltage to an element part, and to control an electric power to be supplied to a heating part based on the detected element impedance. The temperature control part is configured, when the applied voltage control for SOx detection is being performed and at least a voltage decrease sweep is being performed, to perform a second element temperature control to stop detecting the element impedance to set the electric power to be supplied to the heating part to a predetermined electric power.