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Teledyne ML - T100 UV Fluorescence SO2 Analyzer
Calibration Procedures
181
6.5. MANUAL CALIBRATION WITH IZS OPTION
Under the best conditions, the accuracy off the SO
2
effusion rate of the IZS option’s
permeation tube is about ±5%. This can be subject to significant amounts of drift as the
tube ages and the amount of SO
2
contained in the tube is depleted. Whereas this may be
sufficient for informal calibration checks, it is not adequate for formal calibrations and is
not approved for use by the US EPA as a calibration source.
Therefore, for formal calibrations of an instrument with an IZS option installed the
following provisions must be followed.
Zero air and span gas must be supplied to the analyzer through the sample gas inlet as
depicted in Figure 6-1 of Section 6.2.
The calibration procedure must be initiated using the
CAL
button, not the
CALZ
or
CALS
buttons, using the procedure defined in Section 6.2.
Using the
CAL
button does not activate the zero/span or sample/cal valves of the IZS
option, thus allowing the introduction of zero air and sample gas through the sample port
from more accurate, external sources such as a calibrated bottle of SO
2
or a Model T700
Dilution Calibrator.
SAMPLE RANGE = 500.000 PPB SO2 =XXX.X
< TST TST >
CAL CALZ CALS
SETUP
Use for formal
calibration
operations.
Use only for
informal calibration
checks.
Figure 6-8: Manual Calibration with IZS Option
6.6. MANUAL CALIBRATION CHECKS WITH IZS OR ZERO/SPAN
VALVES
Zero and span checks using the zero/span valve or IZS option are similar to that
described in Section 6.3, with the following exceptions:
On units with an IZS option installed, zero air and span gas are supplied to the analyzer
through the zero gas inlet and from ambient air.
On units with a zero/span valve option installed, zero air and span gas are supplied to the
analyzer through the zero gas and span gas inlets from two different sources.
The zero and calibration operations are initiated directly and independently with dedicated
buttons CALZ and CALS.
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Страница 21: ...21 PART I GENERAL INFORMATION ...
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