Serinus® 30 User Manual 3.3
span gas is flooded directly into the sample manifold (the manifold pump or fan is disabled and isolated
with a valve) to a point where it fills the entire manifold and overflows preventing any ambient external
air from entering. Thus the manifold inlet now becomes the calibration vent. The air within the
manifold is then drawn through the instrument where measurements can be taken and compared to
the concentration being delivered by the calibration system.
8.7.7 Trace Default Values
The Serinus 30 Trace default parameters vary from the Serinus 30 standard setup. The following is a
list of differing parameters and their new default/expected values.
Table 15 – Trace Parameter Value Changes
8.7.8 Trace Calibration Guidelines
To perform a multipoint calibration follow the procedure outlined in Section 5.7 for general setup,
some aspects of calibration need more attention to detail. These following steps detail some of the
changes in the calibration procedure that must be understood before performing any calibration.
Note: Before commencing a multipoint calibration, perform a manual background with diluted zero air
flowing at 10 - 20 Lpm in the sample manifold.
Span/Zero gas should be injected directly into the sample manifold with a volume that will
flood the manifold preventing any external air from entering and influencing the Span/Zero
gas.
Losses may occur in sample manifold and tubing due to contaminants entering during
normal measurement cycle. Flooding the sample manifold and tubing with zero air can
help clean these contaminants out.
The instrument must be powered up and in normal measurement calibration mode (ie all
gas lines are attached and ready for use) for up to 48 hours before a calibration can be
performed.
Note: A 48 hour preconditioning is necessary to warm-up materials and ensures that the instrument is
working at its optimum when the calibration is performed. This preconditioning is particularly important for
trace instrument calibrations due to the sensitive nature of the measurements.
The Serinus 30 Trace must be used in a laboratory environment which includes air
conditioning to stabilise the temperature.
A zero test should be performed over a 24 hour period to get an accurate reading of the
Lowest Detectable Limit (LDL) of the entire system installation. Throughout this time
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