44 GMS800 · Operating Instructions · 8013025 V1.2 · © SICK MAIHAK GmbH
Adjustment
Subject to change without notice
6.3.2 Span gases
General requirements
The reference point or the linearity are adjusted with span gases. A span gas is basically a
mixture of zero gas and a measuring component whose measurement is to be adjusted.
Span gas mixtures
In many applications, you can also use span gas mixtures with more than one measuring
component to adjust the reference point of several measuring components.
However, please note that span gas mixtures should not be used in the following applica-
tions:
– When the coexistence of the gas components could physically interfere with the gas
analysis
– When the gas components could chemically react with each other
– When the mixture components in the GMS800 create cross-sensitivity effects in those
measuring components to be adjusted and these cross-sensitivity effects cannot be
automatically compensated
– When separate information was delivered with the analyzer which rules out the use of
span gas mixtures.
Appropriate nominal values
The nominal value of a span gas is the actual concentration of the measuring component
in the span gas.
● For reference point adjustment: On the GMS800, the nominal value may amount to
10 … 120 % of the end value of the respective physical measuring range. Adjust the
nominal value in the range 65 … 100 % of the physical measuring range for precise
adjustment.
● For linearity adjustment: The nominal value should be approx. 50 % (40 … 60 %) of the
end value of the respective physical measuring range.
b
Pay primary attention to the span gas information in the Supplementary
Operating Instructions for the Analyzer Modules fitted.
b
Pay primary attention to the individual information provided.
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