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T400 Calibration Procedures T400 Ozone Analyzer Operator’s Manual
184
Note Throughout this Section are various diagrams showing pneumatic
connections between the T400 and various other pieces of equipment
such as calibrators and zero air sources. These diagrams are only
intended to be schematic representations of these connections and do
not reflect actual physical locations of equipment and fitting location or
orientation. Contact your regional EPA or other appropriate governing
agency for more detailed recommendations.
9.1. BEFORE CALIBRATION
Note If any problems occur while performing the following calibration
procedures, refer to Section 12 of this manual for troubleshooting tips.
9.1.1. REQUIRED EQUIPMENT, SUPPLIES, AND EXPENDABLES
Calibration of the Model T400 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 API’ 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.
06870C DCN6332