Calibration
Calibration
Thermo Scientific
43iQHL Instruction Manual
4-5
Commercial precision dilution systems are available which reliably and
accurately dilute a high concentration gas mixture to provide a reliable span
gas. A high concentration (50 ppm) of SO
2
in air is precisely diluted to the
concentration range required.
The Thermo Scientific 146iQ Multi-gas Calibrator is one such system for
precision dilution.
Regulations typically require zero/span calibration when the instrument is
newly installed, moved, repaired, interrupted for more than a few days, or
when span or zero shift by more than 15%.
All gas must be supplied to the instrument at atmospheric pressure. It may
be necessary to employ an atmospheric bypass plumbing arrangement to
in the “
” chapter
for an example of an atmospheric bypass plumbing arrangement.
If a filter is used, all gas must enter the instrument through the filter.
Note
The calibration and calibration check duration times should be long
enough to account for the transition (purge) process when switching from
sample to zero and from zero to span. This transition time is the time
required to purge the existing air.
▲
Depending on the plumbing configuration and the instrument, data from
approximately the first minute of a zero calibration or check should be
disregarded because of residual sample air. Also, data from approximately
the first minute of a span calibration or check should be disregarded
because the span is mixing with the residual zero air.
▲
Use the following procedure to perform a zero/span calibration.
1.
If the instrument is equipped with the optional zero/span and sample
valves, connect the zero and span gas to the rear panel bulkheads
labeled ZERO IN and SPAN, otherwise connect a source of vented
zero air to the SAMPLE bulkhead. The top right of the title bar
indicates which mode is active: ZERO, SPAN, or SAMPLE.
Note
Do not use nitrogen for zero air.
▲
Commercial Precision
Dilution Systems
Calibration
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