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NOTE
REPEATEDLY PRESSING ENTR TO GET THE
INSTRUMENT TO DISPLAY THE CORRECT SPAN/ZERO
VALVE DOES NOT IMPROVE THE ACCURACY OF THE
CALIBRATION, NOR DOES IT SPEED UP
STABILIZATION. THE REASON FOR WAITING 5-10
MIN. IS THAT IT TAKES THE INSTRUMENT A PERIOD
OF TIME TO ESTABLISH AN ACCURATE AVERAGE
FOR THE SPAN/ZERO READING.
11. Adjust the Analyzer span point.
a. Input span gas of approximately 80% of the related full scale range
concentration from a known source through the sample port of the
Analyzer.
b. Go to manual calibration by pressing the CAL button while in the
sample mode.
c. Enter the operator password (512).
d. The menu should now show SPAN, CONC, and EXIT. Enter the
concentration of the CO calibration gas by pressing CONC and
entering the value from the keyboard.
e. Wait 10 minutes for a stable reading to be attained and then press
SPAN, followed by ENTR. If the SPAN button is not displayed, this
means that the Analyzer is too far out of adjustment to do a reliable
calibration and thus it is not permitted (see Section 3.1 for information
on the calibration limits). The operator can exit the manual calibration
procedure only by pressing the EXIT button.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 7