Schedule Averaging Time; Background Calibration And Span Calibration; Zero Calibration And Span Calibration; Zero/Span Ratio - Thermo Scientific 48iQ Instruction Manual

Calibration

References

Schedule Averaging
Background
Calibration and
Span Calibration
Zero Calibration and
Span Calibration

Zero/Span Ratio

References
4-16 48iQ Instruction Manual
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.
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 1300 seconds.
Background Calibration and Span Calibration are toggle buttons that
change between enabled or disabled.
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 and Span Calibration Commit are toggle buttons that change
between yes or no when selected.
If the zero calibration commit is set to yes, then a zero adjustment is made.
If the span calibration commit is set to yes, then a span adjustment is made.
(This is how to set up a scheduled, recurring auto calibration.)
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.
1. Section 12 of EPA Quality Assurance Handbook for Air Pollution
Measurement Systems, Volume II, available at www.epa.gov.
Section 12 also provides information on "Calibration of Primary and
Secondary Standards for Flow Measurements".
Specific information on certification of concentration standards is given
in EPA Traceability Protocol for Assay and Certification of Gaseous
Calibration Standards, available at www.epa.gov.
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