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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
2-9
Step 3 - Review the quality of the calibration:
Calibration Quality Check Procedure
Step Number Action Comment
1. Scroll the TEST
function menu until
the NO
x
SLOPE is
displayed.
The SLOPE value for NO
x
should be 1.0 ± 0.3. If the value is
not in this range, check Section 7.8 or 9. If the SLOPE value
is in the acceptable range, the instrument will perform
optimally.
2. Scroll the TEST
function menu until
the NO SLOPE is
displayed.
The SLOPE value for NO should be 1.0 ± 0.3. If the value is
not in this range, check Section 7.8 or 9. If the SLOPE is in
the acceptable range, the instrument will perform optimally.
NOTE:
The NO and NO
x
slopes should be equal within ± 0.1.
4. Scroll the TEST
function menu until
the NO
x
OFFSET is
displayed.
The M200AU will display the OFFSET parameter for the NO
x
equation. This number should be near zero. A value of 0.0 mV
–10 +150 mV indicates calibration in the optimal range. If the
OFFSET value is outside this range, check Section 7 or 9 for
procedures to correct the OFFSET value to near zero.
5. Scroll the TEST
function menu until
the NO OFFSET is
displayed.
The instrument will now display the NO OFFSET value. It
should also have a value near zero (0.0 mV –10 +150 mV).
Step 4 - The M200AU is now ready to measure sample gas.