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Calibration Procedure Teledyne API Model M201E NH
3
Analyzer Operator Manual
22 05206H DCN5910
Table 2-6. NH3 Calibration Procedure – NH3 Gas Through The SAMPLE Port
Note: In the example outlined above, the displayed
ammonia
concentration is being increased by 2.27%. Newer M501 NH
3
, 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.
The efficiency factor may also be changed by entering the VARS MENU
and editing NH3_CE_FACTOR1 = 1.0000.
Step No. Action Comment
1. Generate a known
level of NH
3
gas
using a calibration
gas source
Monitor the TNx concentration until it has stabilized;
this signifies that both the NOx and NH3 gases have
stabilized. This could range from 20 minutes to
several hours depending on whether the analyzer /
calibration system has recently been subjected to
ammonia gas.
2. NH
3
Conversion
efficiency
calculation
When the TNx channel is stable, note the
concentration of NH3 displayed. The calculation for
the NH3 Conversion efficiency is:
(Displayed NH3 concentration) divided by
(Delivered NH3 concentration)
Example: The operator is delivering 450 PPB of NH3.
The displayed concentration for NH3 is 440 PPB then
the efficiency factor = 440/450 = 0.9777
3. Press CAL The M201E enters the calibrate mode from Sample
mode.
4. Channel Selection Press TN
X
then Press ENTR.
5. Range Selection Press LOW range then Press ENTR.
6. Press CONC Since TN
x
was chosen previously, then the following
will be displayed:
TNx CONV Exit
Press CONV enter 0.9777, Press ENTR
Press EXIT, EXIT