Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1
Table 2.6 - CALS - Span Cal Procedure - Gas from rear panel span gas inlet
Step No. | Action | Comment |
| ||
1. | Press | The M201A enters the calibrate mode. The |
| CALS | Z/S valves are activated to route span gas into |
|
| the analyzer. |
2. | Press | Set the converter efficiency parameter to 1.0000, then |
| press | |
|
|
|
2. | Wait 20 | Wait for the reading to stabilize at span value. |
| min |
|
3. | Press | If you change your mind after pressing SPAN, |
| SPAN | you can still press EXIT here without spanning |
|
| the instrument. |
4. | Press | Pressing ENTR actually changes the |
| ENTR | calculation equations and causes the |
|
| instrument to read the TN and TNx span |
|
| concentrations. |
5. | Press EXIT | M201A returns to sampling. Immediately after |
|
| calibration, data is not added to the DAS |
|
| averages. |
|
|
|
2.1.2 TN/TNx Channel Calibration Quality
After the TN and TNx channel calibration it is important to check the slopes and offsets to make sure they fall within the acceptable range. The tolerances are different than a typical NOx analyzer primarily because of the performance of the M501NH ammonia converter.
Slopes can vary from 2.0 to 0.7, and should be within 20% of each other with the TNx slope typically smaller than the TN slope.
Offsets should be zero ±250 mV and be within 100mV of each other.
If the slope and offsets are within specifications, proceed on the ammonia channel calibration.
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