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Teledyne API Model M201E NH
3
Analyzer Operator Manual Calibration Procedure
05206H DCN5910 17
Table 2-2. Zero Calibration Procedure - Zero Gas Through ZERO Port
Step No.
Action Comment
1. Press CALZ The M201E enters the calibrate mode from sample
mode. The zero gas is supplied through the ZERO
inlet port on the rear panel of the M501 NH
3
,.
2 Table 2.1 Follow Steps 2 to 8 in Table 2-1.
Notes:
Since the zero gas concentration is defined as 0 ppb, it is not necessary to
enter the expected concentration values.
Both the TN
x
and NO
x
channels must be zeroed individually. When you
zero the NO
x
channel both the offsets for NO
x
and NO are configured. All
readings should display zero following this action.
It is recommended that the calibration of both the TN
x
and NO
x
channels
be done at one time.
Always confirm that excess zero air is flowing past the sample or zero
port, if the Zero/Span option is present, on the rear of the M501 NH
3
,
converter. There should always be some excess flow. If insufficient flow is
supplied to the analyzer ambient gas will be entrained and the zero offset
values will be incorrect. However, it is important not to over pressurize the
analyzer.
It is a good idea to allow the analyzer to sample zero gas for extended
periods following zero calibration. Large drifts can signify leaks or indicate
an issue with the zero air source.
2.2 SPANNING THE ANALYZER WITH NITRIC OXIDE GAS
The analyzer can be spanned by either applying nitric oxide gas straight to the
Sample port or through the Zero/Span valve option, if installed. It is important to
remember that if the analyzer was previously sampling
ammonia gas, prior to
conducting a nitric oxide span calibration, it will take some period of time before
the TN
x
channel stabilizes. The process of spanning the analyzer consists of
diluting bottled gas, using a calibrator and delivering to the analyzer. The