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About Gas Instruments
Gas instruments detect, monitor or analyze gases present in an environment. Detectors sense situations outside normal operating parameters and are set to alarm when these conditions are violated. Monitors are also set up to alarm, but their role is to determine which gases are in the stream being measured, and in what quantity they are present. Analyzers provide a breakdown of what is found, log the information, and can download it to a computer where further analysis and record keeping can be performed. Gas instruments and air instruments can sense sometimes just one gas or else can sense multiple types of gases with one instrument.
When analyzing gases there are seven basic types of measurements that can be made. 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 air (or oxygen) and ignited. In gas-detection systems, the amount of gas present is specified in terms of % LEL: 0% LEL being a combustible gas-free atmosphere and 100% LEL being an atmosphere in which the gas is at its lower flammable limit. The relationship between % LEL and % 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 usually 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.
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Engineering Web: Gas Instruments
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Gas Detection, Gas Monitors, Gas Detectors Toxic Gas Monitors Combustible Gas Detection Gas Detection For Life Personal monitors and fixed gas detectors See RKI Instruments, Inc. Information |
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- Gas Detection, Gas Detectors, Gas Monitors, Control... Crowcon Detection Instruments Ltd develop, manufacture and market a complete range of portable and fixed gas detection products you can trust to See Crowcon Detection Instruments Information |
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ISA | Performance Requirements for Toxic Gas-Detection... ISA-92.0.01, Part I-1998 Performance Requirements for Toxic Gas-Detection Instruments: Hydrogen Sulfide (Downloadable) See International Society of Automation Information |
