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Calibration Procedure Teledyne API Model T201 NH
3
Analyzer Operator Manual
22 07271B DCN6646
Table 2-6. NH
3
Calibration Procedure – NH
3
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.
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 NH
3
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 NH
3
displayed. The calculation for
the NH
3
Conversion efficiency is:
(Displayed NH
3
concentration) divided by
(Delivered NH
3
concentration)
Example: The operator is delivering 450 PPB of NH
3
.
The displayed concentration for NH
3
is 440 PPB then
the efficiency factor = 440/450 = 0.9777
3. Press CAL The T201 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