Any method used to measure the amount of a specific gas or gases in a given environment including both sensors and instruments.
Combustion analyzers and flue gas analyzers measure the gas content of emissions in order to monitor the combustion efficiency of fuel-burning equipment.
Gas chromatographs separate organic chemical mixtures according to physical properties.
Gas instruments detect, monitor or analyze gases present in an environment.
Gas sensors interact with a gas to initiate the measurement of its concentration. The sensor then provides output to an instrument to display the measurements.
Gas transmitters consist of an enclosure, sensor, and electronics that convert a signal from a gas sensor into an analog output signal (typically 4-20 mA).
Gas chromatography columns (GC columns) are of two types: packed and capillary. Solutes to be measured travel through the column at a rate primarily determined by their physical properties, and the temperature and composition of the column.
Gas chromatography detectors (GC detectors) identify solutes as they exit the chromatographic column. A chromatogram is generated plotting the signal versus time.
Total organic carbon (TOC) analyzers measure the amount of total organic carbon present in a liquid sample.