CHAPTER 2, INSTALLATION AND OPERATION
98307600 Rev. C-1 2-13
2.4 Analyzer Calibration
When the EC9830 analyzer is powered on for the first time, the analyzer must be
calibrated to ensure accurate CO measurements. The analyzer does not require re-
calibration after further power interruptions or resets. However if the instrument is
transported to a new location, or maintenance work is performed, the instrument
may require re-calibration. To determine weather the instrument requires a
calibration, a precision check can be performed as discussed in the following
sections.
2.4.1 Precision Checks
A precision check is a Level 2 calibration as discussed in section 3.4. This means
that the instrument is only checked against a know calibration source and is not
adjusted. A precision check can be performed either manually or automatically.
2.4.2 Automatic
Most modern air quality monitoring systems have data acquisition systems which
can automatically initiate and record the results of a daily precision check. The
means by which the analyzer is externally controlled is via the 50 PIN IO
connection, or via the RS232 multidrop connection. Refer to section 4.0 for more
details on interfacing to these ports.
2.4.3 Manual
A manual precision check can be initiated as follows:
1. Connect a source of span gas to the analyzer through the Auxiliary port. (see
chapter 3 for instructions on preparing calibration gas).
2. From the CALIBRATION MENU set CALIBRATION to MANUAL and CAL. MODE
to SPAN.
3. Allow the analyzer to sample the span gas until a stable reading is obtained,
typically 15 minutes.
4. Verify this stable reading against the know calibration concentration.
5. Typically if it is within 5%, then a calibration is not required.
6. If a calibration is required, continue with the following procedure in section
2.4.4. If not, return the CAL. MODE to MEASURE.
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