Model 100E Instruction Manual Calibration Procedures
045150102 Rev XB1 135
7.5. 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 7-1 of Section 7.2.
• The calibration procedure must be initiated using the CAL key, not the CALZ and
CALS keys, using the procedure defined in Section 7.2.
Using the CAL key 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 700 Dilution Calibrator.
SAMPLE RANGE = 500.000 PPB SO2 =X.XXX
< TST TST > CAL CALZ CALS SETUP
Use for formal
calibration
operations.
Use only for
informal calibration
checkss.
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