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M201E Ammonia Analyzer Teledyne API Model M201E NH
3
Analyzer Operator Manual
10 05206H DCN5910
Figure 1-3. M201E and M501 NH
3
, with Zero and Span Valve Options Pneumatic Flow
1.1 THEORY OF OPERATION
The Teledyne-API Model M201E analyzer measures ammonia by oxidizing
it to
nitric oxide by the following reaction:
4NH
3
+ 5O
2
4NO + 6H
2
O
The resulting nitric oxide is then measured by the chemiluminescent reaction with
ozone. Consult Section 10.1 in the M200E manual (provided with this
instrument) for more details on the nitric oxide measurement.
The analyzer uses two converters to oxidize the different sample gases. A high
temperature catalytic converter, the M501 NH
3
,, converts NH
3
and NOx into NO
creating the TN
x
channel. A second converter, housed inside the M201E
analyzer and consisting of heated molybdenum, converts all of the NO
x
in the
sample to NO producing the NO
x
channel. The nitric oxide channel is measured
while bypassing both the M501 NH
3
, and molybdenum converter. A Nafion® drier
operated in reflux mode, is installed prior to the molybdenum converter and the
AutoZero valve. The drier removes ammonia and water from the switched
stream. The ammonia would have otherwise been converted by the molybdenum