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Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
3 PERFORMANCE TESTING
Zero/span checking and calibration of the Teledyne API CO Analyzer is divided into two
sections. Chapter 3 discusses the different methods by which the analyzer's zero and span
settings may be checked and adjusted. The emphasis in Chapter 3 is on the operation of the
buttons and the internal adjustments they make in the instrument.
3.1 Manual Zero/Span Check
NOTE
Zero or span checks can be performed in any order.
NOTE
Span gas concentration may trigger gas alarms unless the analyzer is
in the calibration mode. Press CAL button prior to introducing
span gas into the analyzer.
Operators can manually check the zero and span set-points of the analyzer while in sample mode
by allowing the instrument to sample calibration gas and pressing the CAL button. This is also
referred to as a multi-point calibration.
3.1.1 Zero Check
Allow the analyzer to sample zero air through the sample port. Press CAL button. After a few
minutes the CO reading should go to zero. If it doesn't, the operator may press the ZERO button
followed by ENTR. This will force the CO reading to go to zero and modify the internal
formulas used to compute the CO reading. If the ZERO button is not displayed, this means that
the zero 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. Pressing EXIT will bring you back to the sample menu or leave the
instrument in CAL mode if you are also going to make a span check.
3-1