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Hydrogen is the most abundant chemical element, constituting roughly 75% of the universe's elemental mass. Stars in the main sequence are mainly composed of hydrogen in its plasma state. Naturally occuring elemental hydrogen is relatively rare on Earth.
Hydrogen forms compounds with most elements and is present in water and most organic compounds. It plays a particularly important role in acid-base chemistry with many reactions exchanging protons between soluble molecules
Hydrogen gas is highly flammable and will burn in air at a very wide range of concentrations between 4% and 75% by volume. Large quantities of H2 are needed in the petroleum and chemical industries. The largest application of H2 is for the processing ("upgrading") of fossil fuels, and in the production of Ammonia.
Airmet offers a wide range of portable and fixed gas detectors for detection of Hydrogen. Please note the difference between the ranges available (%LEL or ppm). Use the product selector to find the suitable instrument for your application.
> CAS nr. 1333-74-0
> Relative density: 0.03
> Standard Range: 0 - 100% LEL
> Low Alarm Level: 5% LEL (2000 ppm)
> High Alarm Level: 10% LEL (4000 ppm)
0 - 2% Hydrogen / Air (pdf)