User Interface | 4-15
ZERO and SPAN Check Functions
The analyzer may be zeroed and/or spanned as necessary. This is accomplished
by using the keypad.
When zeroing it is important that the gas applied is known to rep-
resent a zero level (of the analyte), in the correct background. For
span gas, the concentration of the analyte must be accurately known;
and must also be in the correct background. For both cases the gas
must applied long enough to allow the instrument reading to stabilize
before performing the zero or span.
To begin, the analyzer should be in normal operating mode, and sampling. Press
the ENTER key, and the main menu selections will appear on the display:
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