Teledyne 6400A Instruction Manual page 54

Sulfur dioxide analyzer
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TAI Model 6400A SO
Analyzer Operator Manual, 02164, Rev. G
2
3. SELECT RANGE
The range selection is the same with dilution as with normal monitoring. See Section 5.3.4 for
information on range selection. You should note however, the value entered should be the actual
concentration of the calibration gas entering the dilution probe. The units of this number is ppm.
CALIBRATION
When the above selections have been made, the instrument now must be calibrated through the
dilution probe. NOTE: units are now in PPM. See Section 7 for calibration methods.
5.3.4.5 Concentration Units
The 6400A can display concentrations in ppb, ppm, ug/m3, mg/m3. Coefficients for mg/m3 and
o
o
ug/m3 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.
Example: If the current units are in ppb and the span value is 400 ppb, and the units are changed
to ug/m3 the span value is NOT re-calculated to the equivalent value in ug/m3. Therefore the
span value now becomes 400 ug/m3 instead of 400 ppb. Use following equation to convert the
unit with proper temperature and pressure adjustments.
760
mmHg
T
mg
×
×
×
=
SO in ppm
2 86
.
SO in
3
2
o
2
m
273
K
P
NOTE
You should now reset the expected span concentration value which should be
o
adjusted with 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 7.
Changing units affects all of the RS-232 values, all of the display values, and all
of the calibration values and therefore you must recalibrate the analyzer.
5-16

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