Teledyne 6200A - Sulfides analyzer User Manual
Page 125
TAI Model 6200A SO
2
Analyzer Operator Manual, 02164, Rev. G
By rearranging Equation 7.2 it is possible to calculate total air flow which is sum of F
c
and F
d
.
d
c
total
F
F
F
+
=
F
P
SO
total
=
Ч
Ч
Ч
−
10
382 10
3
2
4
[
]
.
Equation 7.3
Total air flow rate should exceed the analyzer's sample flow rate demand by margin of 10% to
50%.
3. Enter the expected concentration [SO
2
] from Equation 7.2 using the procedure in
4. Sample the generated concentration until the SO
2
response is stabilized.
5. Span the instrument per Table 7-13.
If the expected concentration value is 80% of the full range, then the analog voltage output
should measure 80% of the voltage range selected. (e.g. 4.00VDC if 0-5V output is selected.)
The reading on the front panel display should be equal to the expected SO
2
concentration entered
in the procedure given in step 3 above. See the Troubleshooting Section 9.2.8 if there are
problems. Also see the Calibration Quality Check procedure Section 7.10.
After the zero and the 80% URL points have been set, determine five approximately evenly spaced
points between zero and 80% URL without further adjustment to the instrument. And allow the
instrument to sample these intermediate concentrations for about 10 minutes each and record the
instrument response.
6. Plot the analyzer responses versus the corresponding calculated concentrations to obtain the
calibration relationship. Determine the straight line of best fit (y = mx + b) determined by the
method of least squares.
7. After the best-fit line has been drawn for the SO
2
calibration, determine whether the analyzer
response is linear. To be considered linear, no calibration point should differ from the best-fit
line by more than 2% of full scale.
7-18