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Teledyne API Model 201A NH
3
Analyzer Instruction Manual, 04689, Rev. B1
Table 2.6 - CALS - Span Cal Procedure - Gas from rear panel span gas inlet
Step No.
Action Comment
1. Press
CALS
The M201A enters the calibrate mode. The
Z/S valves are activated to route span gas into
the analyzer.
2. Press
CAL-CONV-SET
Set the converter efficiency parameter to 1.0000, then
press ENTR-EXIT.
2. Wait 20
min
Wait for the reading to stabilize at span value.
3. Press
SPAN
If you change your mind after pressing SPAN,
you can still press EXIT here without spanning
the instrument.
4. Press
ENTR
Pressing ENTR actually changes the
calculation equations and causes the
instrument to read the TN and TNx span
concentrations.
5. Press EXIT M201A returns to sampling. Immediately after
calibration, data is not added to the DAS
averages.
2.1.2 TN/TNx Channel Calibration Quality
After the TN and TNx channel calibration it is important to check the slopes and offsets
to make sure they fall within the acceptable range. The tolerances are different than a
typical NOx analyzer primarily because of the performance of the M501NH ammonia
converter.
Slopes can vary from 2.0 to 0.7, and should be within 20% of each other with the TNx
slope typically smaller than the TN slope.
Offsets should be zero ±250 mV and be within 100mV of each other.
If the slope and offsets are within specifications, proceed on the ammonia channel
calibration.
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