Preferred Label : helium ionization detector;
Detailed label : helium ionization detector in gas chromatography;
IUPAC definition : A weak beta source and a high potential raise the helium atom of the carrier gas to
a metastable state. All other substances having an ionization potential lower than
18 eV are ionized, and the current that results is used to measure the components.
The detector is usually employed to measure inorganic compounds at concentrations
between 0.1 and 10 ppmv. It has a linear range of about 10E2 but is somewhat unstable
and requires great care to ensure the helium purity and to eliminate all leaks in
the system.;
Origin ID : H02767;
See also
A weak beta source and a high potential raise the helium atom of the carrier gas to
a metastable state. All other substances having an ionization potential lower than
18 eV are ionized, and the current that results is used to measure the components.
The detector is usually employed to measure inorganic compounds at concentrations
between 0.1 and 10 ppmv. It has a linear range of about 10E2 but is somewhat unstable
and requires great care to ensure the helium purity and to eliminate all leaks in
the system.
