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T400 Ozone Analyzer Operator’s Manual T400 Calibration Procedures
185
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 O
3
. 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 API 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).
9.2. BASIC MANUAL CALIBRATION CHECKS AND CALIBRATION
OF THE T400 ANALYZER
Note ZERO/SPAN CALIBRATION CHECKS VS. ZERO/SPAN CALIBRATION
Pressing the ENTR button during the following procedure resets the
stored values for OFFSET and SLOPE and alters the instrument’s
Calibration. For ZERO /Span Calibration see Section 9.2.3.
9.2.1. SETUP FOR BASIC CALIBRATION CHECKS AND CALIBRATION OF
THE T400 ANALYZER.
Connect the Sources of Zero Air and Span Gas as shown below.
Figure 9-1: Pneumatic connections for Manual Calibration Checks without Z/S Valve
or IZS Options
06870C DCN6332