Gas Analyzers

A gas analyzer is a device that is used to test and examine the properties of a specific type of gas. These sensors are widely used in contamination control mechanisms. Gas analyzers are used in refining plants of chemicals and petroleum, gas production plants, etc. to scrutinize the quality or the content of liquid gases. There are various other types of gas analyzers such as residual gas analyzers which identify the gases present in vacuum environments and exhaust gas analyzers which analyze exhaust systems, such as your motor vehicle

Gas analyzers are used to provide a breakdown of what is found, log the information, and then download it to a computer where it can be further analyzed and kept track of. Gas instruments and air instruments can sometimes sense just one type gas or they can sense numerous types of gases with one instrument. These analyzers can be portable, or fixed devices.

There are seven basic types of measurements that can be made when you are analyzing gases. Percent LEL or lower explosive limit or lower flammable limit (LFL) of a combustible gas is defined as the smallest amount of the gas that will support a self-propagating flame when mixed with oxygen and ignited. In gas-detection systems, the amount of gas present is specified in terms of percentage LEL: Zero percent LEL means a combustible gas-free atmosphere and 100 percent LEL means an atmosphere in which the gas is at its lower flammable limit. The relationship between percentage LEL and percentage by volume differs from gas to gas. Another measurement is percent volume, which measures the amount of a specific gas within a sample. Trace measurement is generally given in units of ppm or ppb. Leakage and consumption rates can also be measured, as can gas density and signature or spectra, which is the spectral signature of the gases present.

The assembly of a gas analyzer consists of: a sensor, a drive section, an operating section and a display section. Each of these parts has unique tasks to perform. The drive section pumps the gases from various processing zones. The operating section determines pumping current flow and converts its reading to a measured value. The value thus determined, is outputted to the display section or to an external heater drive as an electrical signal, which heats the sensor to a predefined temperature.


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