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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
7-19
7.6.5.1 Zero Calibration Procedure
Since the zero gas concentration is defined as 0 ppb, it is not necessary to enter the expected zero
value. The following Table 7-11 details the zero calibration procedure.
Table 7-11: Zero Calibration Procedure
Step Number Action Comment
1. Press CAL The M200AU enters the calibrate mode from sample mode.
NOTE:
The analyzer does not operate the zero/span valves in this mode,
the zero gas enters through the sample port. When the CAL
button is pressed, the adaptive filter is activated. This allows the
instrument to respond rapidly to concentration changes
regardless of their magnitude.
2. Wait 10 min Wait for reading to stabilize at the zero value.
3. Press ZERO If you change your mind after pressing ZERO, you can still
press EXIT here without zeroing the instrument.
4. Press ENTR Pressing ENTR actually changes the calculation equations.
5. Press EXIT M200AU returns to the SAMPLE mode.
7.6.5.2 NO/NO
x
Calibration Procedure
Adjust the NO concentration to approximately 80% of the URL of the NO channel. The expected
NO and NO
x
span concentrations can be determined by measuring the cylinder and diluent flows
and computing the resulting concentrations. If there is any NO
2
impurity in the NO standard gas
it should be taken into account when the NO
x
concentration is entered during the NO/NO
x
channel calibration. This is done by ADDING the impurity concentration to the NO
concentration to get the NO
x
concentration for calibration. Calculate the exact NO and NO
x
concentrations as follows:
[NO
]
=
F
x [NO
]
F
Equation - 8
OUT
NO
STD
T
7
Enter the respective concentrations using the procedure in Table 7-12. The expected span
concentrations need not be re-entered each time a calibration is performed unless they are
changed.
Enter the expected NO
x
and NO span gas concentrations: