083730300A DCN8101 Theory of Operation 143
6. THEORY OF OPERATION
The T300/T300M Gas Filter Correlation Carbon monoxide Analyzer is a microprocessor-
controlled analyzer that determines the concentration of carbon monoxide (CO) in a
sample gas drawn through the instrument. It requires that the sample and calibration
gases be supplied at ambient atmospheric pressure in order to establish a stable gas flow
through the sample chamber where the gases ability to absorb infrared radiation is
measured.
Calibration of the instrument is performed in software and does not require physical
adjustments to the instrument. During calibration, the microprocessor measures the
current state of the IR Sensor output and various other physical parameters of the
instrument and stores them in memory.
The microprocessor uses these calibration values, the IR absorption measurements made
on the sample gas along with data regarding the current temperature and pressure of the
gas to calculate a final CO concentration.
This concentration value and the original information from which it was calculated are
stored in the unit’s internal data acquisition system (DAS).
6.1 MEASUREMENT METHOD
This Section presents measurement principles and fundamentals for this instrument.
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