Calibration Procedure | Teledyne API Model T201 NH3 Analyzer Operator Manual |
Table 2-6. NH3 Calibration Procedure – NH3 Gas through the SAMPLE Port
Step No. | Action | Comment |
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1. | Generate a known | Monitor the TNx concentration until it has stabilized; | |
| level of NH3 gas | this signifies that both the NOx and NH3 gases have | |
| using a calibration | stabilized. This could range from 20 minutes to | |
| gas source | several hours depending on whether the analyzer / | |
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| calibration system has recently been subjected to | |
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| ammonia gas. |
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2. | NH3 Conversion | When the TNx channel is stable, note the | |
| efficiency | concentration of NH3 displayed. The calculation for | |
| calculation | the NH3 Conversion efficiency is: |
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|
| (Displayed NH3 concentration) divided by | |
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| (Delivered NH3 concentration) |
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| Example: The operator is delivering 450 PPB of NH3. | |
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| The displayed concentration for NH3 is 440 PPB then | |
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| the efficiency factor = 440/450 = 0.9777 | |
3. | Press CAL | The T201 enters the calibrate mode from Sample | |
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| mode. |
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4. | Channel Selection | Press TNX then Press ENTR. |
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5. | Range Selection | Press LOW range then Press ENTR. | |
6. | Press CONC | Since TNx was chosen previously, then the following | |
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| will be displayed: |
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| TNx CONV | Exit |
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| Press CONV enter 0.9777, Press ENTR | |
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| Press EXIT, EXIT |
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Note | In the example outlined above, the displayed ammonia concentration is being | ||
increased by 2.27%. Newer M501 NH3 converters should have efficiency values very close to 1.00. Depending on the operator’s acceptable level of error, it may not be necessary to change the efficiency factor from 1.00. Therefore, calibration with nitric oxide gas is all that is required.
22 | 07271B DCN6646 |