
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
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.