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Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
8.3 Zero/Span Checking
It is recommended that the Model 300M be checked daily for zero and span drift.
With the Automatic Zero/Span Check and Remote Zero/Span Check features of the Model
300M, daily zero and span checks are easy.
For Automatic Zero/Span Check and Remote Zero/Span Check to be effective, it is necessary
that the analyzer have the Zero/Span valve option. This option includes the two three-way
stainless steel valves and requires user-supplied sources of zero air and span gas delivered at
ambient pressure.
Operating instructions for Automatic Zero/Span Check and Remote Zero/Span Check are
described in Sections 3.3 through 3.6.
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