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12. Set the calibrator to produce 75% to 85% of the URL (upper range limit).
This will be 40 ppm ±2.5 ppm on the 50 ppm range.
13. Allow the Analyzer to sample the CO concentration.
14. Push “CAL”
15. Enter password. (If enabled)
16. Push “CONC”
17. Change the span value in the display to the calculated CO concentration in
the manifold in ppm units, and push “ENTR”.
18. Wait 15 minutes for the Analyzer to stabilize.
19. Push “SPAN” and “ENTER.” The Analyzer is now spanned. Record the
calculated CO concentration, the DVM reading and the percentage chart
reading, or the RS-232 output.
20. Push “EXIT,” “EXIT.” The Analyzer is now returned to the normal
Sample mode.
21. Introduce at least five (5) more approximately evenly spaced CO
concentrations into the manifold to complete the manual calibration.
22. Record all calculated CO concentrations, DVM reading and strip-chart
recorder readings or RS-232 output readings.
23. Plot the calculated CO concentrations (X-axis) versus output voltages
and/or percentage chart readings (Y-axis).
Calculate the curve equations:
[CO] ppm = (Volts - b) / m
where b is the offset (should be within ± 0.05 volts of zero setting)and m
is the slope (should be .098 to .102 based on 0-5V full scale)
or
[CO] = (% chart - b) / m
(b should be within ± 1% of chart and m should be 1.96 to 2.04)
The correlation coefficient r should be 0.998 or higher.
The Analyzer is now calibrated. All CO concentration data should be obtained by
reading the Analyzer output in volts or percentage of chart and converting to ppm
from the appropriate equation or curve.
If poor correlation exists, check for
1. Flow calculation errors,
2. Concentration calculation errors,
3. Leaks in manifold,
4. Dirt in the manifold,
5. Proper manifold venting,
6. Zero air system.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 75