References - Thermo Scientific 48i Instruction Manual

References

Thermo Fisher Scientific
check each parameter is made independently. Thermo Fisher Scientific
suggests that the auto-zero should be programmed to make an actual
adjustment every two hours, but that recommendation does not apply to
the automatic span. In general, the span factor is less affected by changes in
the operating environment and will hold stable for a period of weeks
without any adjustment. In addition, some air monitoring regulations may
prohibit automatic span adjustments.
Based on experience with the analyzer, the operator may decide to alter the
zero adjustment frequency and whether to add automatic span checking or
adjustment. For detailed instruction on programming the automatic zero
and span checking or adjustment, see "Zero/Span Check" on page XX.
1. Section 12 of EPA-454/R-98-004, Quality Assurance Handbook for Air
Pollution Measurement Systems, Volume II, Part 1, August 1998,
available at www.epa.gov/ttn/amtic/qabook.html, and 40 CFR 50,
Appendix C "Measurement Principle and Calibration Procedure for the
Measurement of Carbon Monoxide in the Atmosphere (Non-
Dispersive Infrared Photometry)".
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-600/R93/224, EPA Traceability Protocol for Assay and
Certification of Gaseous Calibration Standards, 1993 Available from
www.NTIS.gov (PB94130424).
Model 48i Trace Level-Enhanced Instruction Manual
Calibration
References
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