Teledyne 6400A - Sulfur dioxide analyzer - Manual (Page 106)

TAI Model 6400A SO
2
Analyzer Operator Manual, 02164, Rev. G
7-24
Table 7-15: NIST-SRM's Available for Traceability of Calibration and Audit Gas
Standards
NIST-SRM 4 Type Nominal concentration
1693
1694
SO
2
in N
2
SO
2
in N
2
50 ppm
100 ppm
Permeation Tubes
NIST-SRM
4
Type
Permeation rate,
ug/min @ 25
o
C
Concentration, ppm at flow rates
of: 1 L/min / 5 L/min
1625
1626
1627
SO
2
permeation tube
SO
2
permeation tube
SO
2
permeation tube
2.8
1.4
0.56
1.07 / 0.214
0.535 / 0.107
0.214 / 0.0428
Cylinders of working gas traceable to NIST-SRM's (called EPA Protocol Calibration Gas) are
also commercially available (from sources such as Scott Specialty Gases, etc.).
7.9 Special Calibration Requirements for Dual Range or
Auto Range
If Dual Range or Auto Range is selected, then it should be calibrated for both Range1 and Range2
separately. Pressing CAL key will prompt #1 and #2 keys for Range1 (Low Range) or Range2 (Hi
Range) calibration selection. Select desired range number and press ENTR to proceed to the
calibration. Once Range# is selected, the display will show Test Measurements and SO
2
concentration for the corresponding Range#. You must enter expected SO
2
gas concentrations
separately per Table 7-3 procedure for each Range #.
For zero calibration allow zero gas through the sample port and proceed to manual zero calibration
procedure per Table 7-2, step 2 through step 4. After zero calibration is set, switch to span SO
2
gas
to continue for span calibration procedure per Table 7-4 step 2 through step 4. Press EXIT to exit
from the current Range.
Repeat above procedure for other Range # by pressing CAL key and selecting Range # as described
above. Enter once again corresponding SO
2
gas concentration for selected Range # and continue
zero/span calibration for other Range # selected.