CHAPTER 1, DESCRIPTION
98307600 Rev. C-1 1-1
1.0 Description
The EC9830 carbon monoxide (CO) analyzer is a nondispersive infrared
photometer that accurately and reliably measures low concentrations of CO, using
gas filter correlation and state-of-the-art optical and electronic technology.
The EC9830 analyzer generates infrared radiation (IR) that is absorbed by the CO
within the 5-meter folded pathlength. The gas filter correlation wheel facilitates
rejection of interferents and the narrow band-pass filter ensures measuring only
the CO-sensitive IR wavelengths. The CO content of the sample is continuously
measured from a user-supplied air stream of which the instrument extracts 1 slpm
(standard litre per minute) of sample.
The EC9830 has a built-in catalytic zero air scrubber which provides CO-free air
to the analyzer. The microprocessor automatically resets the zero reading after the
analyzer has sampled air through the converter.
In addition to temperature and pressure compensation, the EC9830 analyzer can
readjust its span ratio based on a known concentration of gas used to span the
analyzer. This feature is not automatically implemented and must be selected by
the operator.
Analog and digital outputs are available for data monitoring. The operator can
select analog output as either current or voltage output. Current ranges are 0-20,
2-20, and 4-20 mA. Voltage outputs include 0-10, 0-5, 0-1, and 0-0.1 volts
(50-pin I/O board optional in EC9830 B series)
Data collection and recording is available to either a data acquisition system (such
as a datalogger) or strip-chart recorder. A convenient DB50 connector is also
included for digital input control and digital output status. The EC9830 also
features internal data storage capabilities.
The instrument also includes an over-range feature that, when enabled,
automatically switches to a preselected higher range if the reading exceeds 90% of
the nominal range. When the reading returns to 80% of the nominal range, the
analyzer automatically returns to that range.
The EC9830 carbon monoxide analyzer is designated as a reference method by the
U.S. EPA. The operational parameters that apply when using the instrument as a
designated reference method are included in section 1.2 below.
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