Teledyne 100AH instruction manual Calibration Gases

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

8.8 Calibration Gases

The following are recommended for selecting calibration gas:

1.Concentration of span gas should be about 80% of the full scale range if direct cylinder span gas is used without dilution. Also select reasonable range to operate for optimum instrument performance such as linearity , noise, etc. For example, if the typical sample concentration is about 300 PPM and the maximum peak concentration is about 800 PPM, then set the range to 1000 PPM and calibrate with 800 PPM of SO2 gas. If the sample concentration is very low, then set the range low accordingly or use AUTORANGE (refer Section 5.3.4) feature.

2.Cylinder source SO2 gas should be balanced in nitrogen and diluted with nitrogen (ultrazero grade). If diluted with dry zero air instead of nitrogen, it must be free of NO gas or other contaminants.

3.Do not use blended gas of SO2 and NO gas mixture in nitrogen. NO gas in nitrogen interfere with the M100AH fluorescence SO2 measurement. If the sample gas contains about 10% of CO2, then the interference from the NO gas will be reduced significantly. M100AH is designed with special optical filter that rejects NO interference greater than 100 to 1 ratio. Therefore with the special optical filter and mixture of CO2 gas in the sample will result very low NO gas interference.

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