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Calibration
Zero/Span Schedule
Zero/Span/Purge
The Zero Duration button defines how long zero air is sampled by the
instrument. The Span and Purge Duration buttons look and function the
Duration Minutes
same way as the zero duration button. The span duration button is used to
set how long the span gas is sampled by the instrument. The purge
duration button is used to set how long the purge period will be after doing
a zero and/or span. This gives the instrument time to flush out the zero and
span gas before any meaningful sample data is taken. Logged data is flagged
as taken during a purge to show that the data is suspect. Durations between
0 and 99 minutes are acceptable. Each time a zero/span schedule occurs the
zero is done first, followed by the span. To perform just a zero, set the span
duration to 0 (off). The same applies to perform just a span.
Schedule Averaging
The Schedule Averaging Time button allows the user to adjust the schedule
averaging time. The schedule averaging time is used by the analyzer only
Time
when performing a zero/span schedule. The analyzer's averaging time is
used for all other functions. Range is 1300 seconds.
Background
Background Calibration and Span Calibration are toggle buttons that
change between enabled or disabled.
Calibration and
Span Calibration
If the background calibration is set to enabled, then a zero adjustment is
made. If the span calibration is set to enabled, then a span adjustment is
made. (This is how to set up a scheduled, recurring auto calibration.)
Zero/Span Ratio
The Zero/Span Ratio button is used to set the ratio of zero checks or
adjustments to span checks or adjustments. For example, if this value is set
to 1, a span duration will follow every zero duration. If this value is set to 3,
there will be two zero checks between each span check. This value may be
set from 1 to 99, with 1 as default.
Thermo Scientific
42iQHL Instruction Manual
4-25
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