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EPA Protocol Calibration T400 Ozone Analyzer Operator’s Manual
206
A general procedure for dynamically calibrating a O
3
analyzer can be found in 40 CFR
50 Appendix C. Calibration can be done by either diluting high concentration O
3
standards with zero air or using separate supplies of O
3
at known concentration.
Care must be exercised to ensure that the calibration system meets the guidelines
outlined in the revised Appendix D, 40 CFR 50.
1
Detailed calibration procedures are
also discussed in the Technical Assistance Document (TAD).
2
Dynamic multipoint
calibration of the T400 must be conducted by using either the UV photometric
calibration procedure or a certified transfer standard. The equipment (i.e. calibrator and
UV photometer) that is needed to carry out the calibration is commercially available, or
it can be assembled by the user.
Calibrations should be carried out at the field-monitoring site. The Analyzer should be
in operation for at least several hours (preferably overnight) before calibration. During
the calibration, the T400 should be in the CAL mode, and therefore sample the test
atmosphere through all components used during normal ambient sampling and through
as much of the ambient air inlet system as is practicable. If the instrument will be used
on more than one range, it should be calibrated separately on each applicable range.
Details of documentation, forms and procedures should be maintained with each
analyzer and also in a central backup file as described in Section 12 of the Quality
Assurance Handbook.
Personnel, equipment and reference materials used in conducting audits must be
independent from those normally used in calibrations and operations. Ozone audit
devices must be referenced to a primary UV photometer or one of the Standard
Reference Photometers maintained by NIST and the US EPA.
10.1.2. CALIBRATION EQUIPMENT, SUPPLIES, AND EXPENDABLES
The measurement of O
3
in ambient air requires a certain amount of basic sampling
equipment and supplemental supplies. These include, but are not limited to, the
following:
Equivalent Method photometric O
3
analyzer, such as the TAPI Model T400
Strip chart recorder and/or data logging system
Sampling lines
Sampling manifold
UV (ultraviolet) photometric calibration system
Certified calibration transfer standards
Zero-air source
Ozone generation device ("calibrator")
Spare parts and expendable supplies
Record forms
Independent audit system
When purchasing these materials, a logbook should be maintained as a reference for
future procurement needs and as a basis for future fiscal planning.
06870C DCN6332