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M400E Calibration Procedures M400E Ozone Analyzer Operator’s Manual
9.1. BEFORE CALIBRATION
NOTE
If any problems occur while performing the following calibration procedures, refer to Chapter 13 of this
manual for troubleshooting tips.
9.1.1. REQUIRED EQUIPMENT, SUPPLIES, AND EXPENDABLES
Calibration of the Model 400E O
3
Analyzer requires certain amount of equipment and supplies. These include,
but are not limited to, the following:
Zero-air source
Ozone span gas source
Gas lines - All gas lines should be PTFE (Teflon) or FEP
A recording device such as a strip-chart recorder and/or data logger (optional)
9.1.2. ZERO AIR AND SPAN GAS
To perform the following calibration you must have sources for zero air and span gas available.
ZERO AIR is similar in chemical composition to the Earth’s atmosphere but scrubbed of all components that
might affect the analyzers readings. For O
3
measuring devices, zero air should be:
Devoid of O
3
and Mercury Vapor, and;
Have a dew point of -20C.
Devices that condition ambient air by drying and removing any pollutants, such as the Teledyne Instruments’
Model 701 Zero Air Module, are ideal for producing Zero Air.
SPAN GAS is a gas specifically mixed to match the chemical composition of the type of gas being measured at
near full scale of the desired measurement range. It is recommended that the span gas used have a
concentration equal to 80% of the full measurement range.
EXAMPLE: If the application is to measure between 0 ppm and 500 ppb, an appropriate span gas would
be 400 ppb.
EXAMPLE: If the application is to measure between 0 ppb and 1000 ppb, an appropriate Span Gas
would be 800 ppb.
Because of the instability of O
3
, it is impractical, if not impossible, to produce stable concentrations of bottled,
pressurized O3. Therefore, when varying concentrations of O
3
is required for span calibrations they must be
generated locally. We Recommend using a gas dilution calibrator with a built in O
3
generator, such as a
Teledyne Instruments’ Model 700E, as a source for O
3
span gas.
All
equipment used to produce calibration gasses should be verified against EPA / NIST traceable standards
(see Section 10.1.4).
150 04315 Rev. C1