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Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
3.1.2 Span Check
Allow the analyzer to sample span gas through the sample port. Press CAL button. After a few
minutes the CO reading should be at the expected concentration. If the correct concentration is
not reached, then the instrument can be adjusted to read the correct value. To do this, press
CONC and enter the expected concentration of the calibration gas. The SPAN button should
now be displayed on the front panel. Pressing SPAN and ENTER will modify the internals
formulas used to compute the CO reading. If the SPAN button is not displayed, this means that
the span reading is too far out of adjustment to do a reliable calibration. The reason for this must
be determined before the analyzer can be calibrated. See Section 10.5 for troubleshooting
calibration problems.
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