Model 400E Ozone Analyzer
Instruction Manual
CALIBRATION PROCEDURES
P/N 04316 Rev: B
165
Devices that condition ambient air by drying and removing any pollutants, such as
the T-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. 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 T-API Model
700, 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 8.1.4).
7.2.
Manual Calibration & Calibration without
Zero/Span Valve or IZS Options
This is the basic method for manually calibrating the Model 400E O
3
Analyzer.
ZERO/SPAN CALIBRATION VS. ZERO/SPAN CHECK
Pressing the
ENTR
key during the following procedure resets the
stored values for OFFSET and SLOPE and alters the instrument’s
Calibration.
If you wish to perform a ZERO CHECK see Section 7.3.
STEP ONE:
Connect the Sources of Zero Air and Span Gas as shown below.