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EPA Protocol Calibration
Model 400E Ozone Analyzer
Instruction Manual
188
P/N 04316 Rev: B
We Recommend using a Gas Dilution Calibrator with a built in O
3
generator, such as
a T-API Model 700, as a source for O
3
Span Gas.
In ALL cases the instrument(s) supplying the Zero Air and Span calibration gasses
used must themselves be calibrated and that calibration must be traceable to an
EPA/NIST primary standard.
8.1.4.
Recommended Standards for Establishing Traceability
Equipment used to produce calibration gasses should be verified against EPA/NIST
traceable standards.
Ozone is the only criteria pollutant for which standard concentrations for calibration
cannot be directly traceable to an NIST-SRM (National Institute of Standards -
Standard Reference Material).
Such standards are classified into two basic groups: primary standards and transfer
standards.
1.
A primary O
3
standard is an O
3
concentration standard that has been
dynamically generated and assayed by UV photometry in accordance with the
procedures prescribed by the U.S. Environmental Protection Agency (EPA) under
Title 40 of the Code of Federal Regulations, Part 50, Appendix D (40 CFR
Part 50).
2.
An O
3
transfer standard is a transportable device or apparatus, which, together
with associated operational procedures, is capable of accurately reproducing O
3
concentration standards or producing accurate assays of O
3
concentrations
which are quantitatively related to a primary O
3
standard.
It is worth noting that the requirements for the repeatability and reliability of
transfer standards are more stringent than those for Stationary, primary standards.
A Standard Reference Photometer (SRP) has been developed as a primary O
3
standard by the U.S. National Institute of Standards and Technology (NIST) and the
EPA. It is a highly stable, highly precise, computer-controlled instrument for
assaying O
3
concentrations. NIST maintains one or more “master” SRP’s in lieu of
an Standard Reference Materials (SRM) for ozone. A nationwide network of
regionally located SRP’s enables State and local air monitoring agencies to compare
their O
3
standards with authoritative O
3
standards maintained and operated under
closely controlled conditions. Other SRP’s are located in foreign countries.
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