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Teledyne API Model 201A NH
3
Analyzer Instruction Manual, 04689, Rev. B1
2.0 CALIBRATION PROCEDURE
Calibration of the M201A is done by first calibrating the TN and TNx channels with NO
span gas diluted with zero air. In the second phase of calibration, ammonia span gas is
introduced to measure the overall system efficiency for NH3 conversion. Unlike NOx
analysis, the NH3 converter efficiency must be measured because it is considerably
lower than 100% and may change as the converter ages.
If the instrument is configured as a basic model, all zero/span gasses are introduced
through the sample port. If the Zero/Span valves option or the ECO option is ordered,
the zero/span gas is introduced through the zero/span valves. There are several ways
of automating the calibration or span check process, they are covered in Section 7 of
the M200A manual. After reviewing the procedure described below, it should be simple
to adapt the procedures in Section 7 to the M201A, if necessary.
2.1 Zero/Span Calibration – Basic Instrument
Since the zero gas concentration is defined as 0 ppb, it is not necessary to enter the
expected zero value.
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