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EPA Protocol Calibration
Alternate units: ensure that the ppb units are selected for EPA monitoring. Refer to Section
4.6.7.
7.4.1. PRECISION CALIBRATION
7.4.2. PRECISION CHECK
7.5. DYNAMIC MULTIPOINT SPAN CALIBRATION
For each mid point:
204
The analyzer should be calibrated on the same range used for monitoring. If the AUTO
range mode is selected, the highest of the ranges will result in the most accurate
calibration, and should be used.
To perform a precision calibration, the instrument set up; input sources of zero air and
sample gas and; procedures should conform to those described in Section 6.2 for
analyzers with no valve options or IZS valve option installed and Section 6.5 for
analyzers with IZS options installed with the following exception:
A periodic check is used to assess the data for precision. A one-point precision check
must be carried out at least once every 2 weeks on each analyzer at an SO
between 0.08 and 0.10 ppm. The analyzer must be operated in its normal sampling
mode, and the precision test gas must pass through all filters, scrubbers, conditioners,
and other components used during normal ambient sampling. The standards from which
precision check test concentrations are obtained must be traceable to NIST-SRM. Those
standards used for calibration or auditing may be used.
To perform a precision check, the instrument setup; sources of zero air and sample gas
and procedures should conform to those described in Section 6.1.1 for analyzers with no
valve options or IZS valve option installed and Section 6.6 for analyzers with Z/S or IZS
options installed with the following exception:
Connect the analyzer to a precision gas that has an SO
0.10 ppm. If a precision check is made in conjunction with a zero/span check, it must be
made prior to any zero or span adjustments.
Record this value. Information from the check procedure is used to assess the precision
of the monitoring data; refer to 40 CFR 58 for procedures for calculating and reporting
precision.
Dynamic calibration involves introducing gas samples of known concentrations to an
instrument in order to record the instruments performance at a predetermined sensitivity
and to derive a calibration relationship. A minimum of three reference points and one
zero point uniformly spaced covering 0 to 90 percent of the operating range are
recommended to define this relationship.
The analyzer's recorded response is compared with the known concentration to derive
the calibration relationship.
To perform a precision check, the instrument set up, sources of zero air and sample gas
should conform to those described in Section 6.2.
Follow the procedures described in Section 6.2 for calibrating the zero points.
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
concentration between 0.08 and
2
06807A(DCNxxxx)
concentration
2
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