CHAPTER 3, CALIBRATION
98307600 Rev. C-1 3-1
3.0 Calibration
3.1 Overview
The calibration chapter consists of:
a general discussion of calibration
a description of the multipoint calibration procedure
a description of automatic zero/span (AZS) setup
a discussion of the AZS feature.
The EC9830 carbon monoxide analyzer is a precision measuring device which
must be calibrated against a known source of carbon monoxide that is traceable to
a National Institute of Standards and Technology (NIST) standard. (Formerly
NIST was the National Bureau of Standards, or NBS.)
In general terms, the calibration process consists of the following steps:
1. Establish a reliable and stable calibrating source.
2. Provide a satisfactory connection between the calibration source and the
analyzer.
3. Calibrate the analyzer against the calibration source.
Multipoint calibration is used to establish the relationship between analyzer
response and pollutant concentration over the analyzer's full scale range. Zero and
span checks are frequently used to provide a two-point calibration or an indication
of analyzer stability and function.
Regulations generally require that the analyzer be recalibrated any time it is
moved or serviced, or whenever analyzer characteristics may have changed. This
includes changing the instruments units from volumetric to gravimetric.
Regulatory agencies establish the time intervals at which the analyzer must be
calibrated to ensure satisfactory data for their purposes.
Important
Use of the EC9830 CO analyzer as a U.S. EPA
designated reference method requires periodic
multipoint calibration in accordance with the
procedure described below. In addition, the
instrument must be set to the parameters indicated
in Chapter 1, Introduction.
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