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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
8.7 Calibration Quality
After Zero/Span is complete, it is very important to check the QUALITY of the calibration. The
calibration of the M100AH involves balancing several sections of electronics and software to
achieve an optimum balance of accuracy, noise, linearity and dynamic range.
The following procedure compares the Slope and Offset parameters in the equation used to
compute the SO
2
concentration.
The slope and offset parameters are similar to the span and zero pots on an analog instrument.
Just as in the analog instrument, if the slope or offset gets outside of a certain range, the
instrument will not perform as well.
The offset value gives information about the background signal level. Check the observed offset
value against the factory value in Table 2-1. If significantly higher check Section 10.1.6.
Increasing readings are a predictor of problems.
Table 8-8: Calibration Quality Check
Step
Number
Action Comment
1. Scroll the TEST
function menu until the
SLOPE is displayed.
Typical SLOPE value for SO
2
is 1.0
±
0.3. If the value is
not in this range, check Section 10.1.6. If the SLOPE value
is in the acceptable range the instrument will perform
optimally.
2. Scroll the TEST
function menu until the
OFFSET is displayed.
Typical number is less than 200mV which is mainly the
optical system background. If the OFFSET value is outside
this range, check Section 10.1.6.
After the above procedure is complete, the M100AH is ready to measure sample gas.
8-8