Thermo Scientific 450iQ Instruction Manual page 165

Thermo Scientific
system, such as sample lines, and particulate filters, which are used in
normal monitoring should also be used during calibration. Finally, it is
recommended that the recording devices and outputs used during normal
monitoring be calibrated prior to the instrument calibration and that they
be used during the calibration or the zero/span check.
Perform the following pre-calibration procedure before calibrating the
450iQ. For detailed information about the menu parameters and the icons
used in these procedures, see the "Operation" chapter.
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.
Note Depending on the plumbing configuration and the instrument
settings including averaging time, 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.
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1. Allow the instrument to warm up and stabilize.
2. Be sure the instrument is in the auto mode, that is, SO
measurements are being displayed on the front panel display. If the
instrument is not in auto mode:
a. From the Home screen choose Settings>Measurement
Settings>Advanced Measurement Settings>Auto/Manual Mode.
b. Select SO /CS.
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Note Does not apply if selective SO
H S can be measured with this option.
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3. Check the averaging time. It is recommended that a higher averaging
time be used for best results.
a. From the Home screen choose Settings>Measurement
Settings>Averaging time. (Ensure Dynamic Filtering is disabled to
access Averaging Time.)
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Scrubber option is installed since only
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450iQ Instruction Manual
Calibration
Pre-Calibration
, H S, and CS
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