Theory Of Operation - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual

10. THEORY OF OPERATION

The Model 300E 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
sample and calibration gasses 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 one of the unit's Internal Data Acquisition System (iDAS - see
Sections 6.10 and 6.11) as well as reported to the user via a Vacuum Florescent
Display or a variety of digital and analog signal outputs.
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THEORY OF OPERATION
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