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Model 400E Ozone Analyzer
Instruction Manual
8. EPA PROTOCOL CALIBRATION
In order to insure that high quality, accurate measurement information is obtained
at all times, the analyzer must be calibrated prior to use. A quality assurance
program centered on this aspect and including attention to the built-in warning
features of the analyzer, periodic inspection, regular zero/span checks and routine
maintenance is paramount to achieving this.
The US EPA strongly recommends that you obtain a copy of the publication Quality
Assurance Handbook for Air Pollution Measurement Systems (abbreviated, Q.A.
Handbook Volume II); USEPA Order Number: EPA454R98004; or NIST Order
Number: PB99-129876.
This manual can be purchased from:
EPA Technology Transfer Network (http://www.epa.gov/ttn/amtic)
National Technical Information Service (NTIS, http://www.ntis.gov/)
A bibliography and references relating to O
8.1.1. M400E Calibration – General Guidelines
Calibration is the process of adjusting the gain and offset of the M400A against
some recognized standard. The reliability and usefulness of all data derived from
any analyzer depends primarily upon its state of calibration.
In this section the term dynamic calibration is used to express a multipoint check
against known standards and involves introducing gas samples of known
concentration into the instrument in order to adjust the instrument to a
predetermined sensitivity and to produce a calibration relationship. This relationship
is derived from the instrumental response to successive samples of different known
concentrations. As a minimum, three reference points and a zero point are
recommended to define this relationship. 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 (see
Section 8.1.4.)
All monitoring instrument systems are subject to some drift and variation in internal
parameters and cannot be expected to maintain accurate calibration over long
periods of time. Therefore, it is necessary to dynamically check the calibration
relationship on a predetermined schedule. Zero and span checks must be used to
document that the data remains within control limits. These checks are also used in
data reduction and validation.
P/N 04316 Rev: B
EPA Protocol Calibration
monitoring are listed in Section 6.
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