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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
5.3.4.4 Concentration Units
The M100AH can display concentrations in PPM, mg/m
3
. Coefficients for mg/m
3
were based on
0°C (25°C for U.S.EPA), 760 mmHg. Different pressure and temperature can be used by
adjusting values entered for calibration gas to read the correct concentration at the conditions
being used. This adjustment is not needed if units are within the same type.
To change the current units press SETUP-RNGE-UNIT from the SAMPLE mode and select the
desired units.
CAUTION
If the current units are in PPM and the span value is 400 PPM, and
the units are change to mg/m
3
the span value is NOT re-calculated to
the equivalent value in mg/m
3
. Therefore the span value now becomes
400 mg/m
3
instead of 400 PPM. Use the following equation to convert
the unit with proper temperature and pressure adjustments. Then
recalibrate the analyzer.
SO in ppm
T
K
mmHg
P
SO in
mg
m
o
22
3
286
273
760
×× × =
.
NOTE
You should now re-enter the expected span concentration value in
different units which should be adjusted for proper pressure and
temperature (25°C for U.S. EPA) in the new units and re-calibrate
the instrument using one of the methods in Section 8.
Changing units affects all of the RS-232 values, all of the display
values, and all of the calibration values and therefore you must
re-calibrate the Analyzer.
5-17