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089770000 Rev 05
Teledyne API N500 CAPS NO
X
Analyzer with NumaView™ Software
55
The method for performing an initial calibration for the analyzer differs between the
standard instrument and those with options.
•
See Section 4.2.1 for instructions for initial calibration of the analyzer in its base
configuration.
•
See Section 4.2.2 for information regarding setup and calibration of the analyzer
with Z/S Valve options.
Note
Zero air and span gases must be supplied at twice the
instrument’s specified gas flow rate.
ZERO AIR
Zero air or zero calibration gas is similar in chemical composition to the measured
medium but without the gas to be measured by the analyzer. A zero generator, such as the
Teledyne API Model 701, can be used.
CALIBRATION (SPAN) GAS
Calibration gas is specifically mixed to match the chemical composition of the type of
gas being measured at near full scale of the desired reporting range.
Alternatively, if a calibrator is available that is a trusted source of stable ozone, e.g.,
Teledyne API Model T700U with certified photometer, it is possible to use that O
3
output
directly to obtain the NO
2
concentration.
SPAN GAS FOR MULTIPOINT CALIBRATION
Some applications, such as EPA monitoring, require a multipoint calibration where span
gases of different concentrations are needed. We recommend using an NO
2
gas of higher
concentration combined with a gas dilution calibrator such as the Teledyne API Model
T700. Calibrators mix high concentration gas with zero air to accurately produce span gas
of the desired concentration. Linearity profiles can be automated with these models and
run unattended overnight.
If a dynamic dilution system is used to dilute high concentration gas standards to low,
ambient concentrations, ensure that the NO
2
concentration of the reference gas matches
the dilution range of the calibrator. (Section 2.5.5 contains information about the dilution
option).
Choose the NO
2
gas concentration so that the dynamic dilution system operates in its
mid-range and not at the extremes of its dilution capabilities.
CAUTION!
If the presence of ozone is detected at any time, power
down the instrument and contact Teledyne API Technical
Содержание N500
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