9 Glossary of Terms
Accuracy
In general with analyzers when we use the word “accuracy” we imply
“repeatability” as well; which is the degree to which an analyzer can
repeat the same measurement reading on the same gas. All factory
analyzers are compared using a measured gas against a known
standard, and the accuracy of the measurement is therefore dependent
upon this standard.
Come-down
A term referring to the operation of an analyzer reducing its
reading from a high level to a low or zero level. For trace analyzers
this can be quite long, as it can take a long time for the final traces of
oxygen to diffuse out of the gas sampling syetem.
Electrochemical
A type of chemical reaction which produces an electrical current as
part of the reaction. In this case, the oxygen sensors produce an
electrical current in proportion to the amount of oxygen present at
their membrane surface.
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