Theory Of Operation - Teledyne 400E Instruction Manual

Model 400E Ozone Analyzer
Instruction Manual

10. THEORY OF OPERATION

The Model 400E Ozone Analyzer is a microprocessor controlled analyzer that
determines the concentration of Ozone (O
instrument. It requires that sample and calibration gasses be supplied at ambient
atmospheric pressure in order to establish a stable gas flow through the Absorption
Tube where the gas' ability to absorb ultraviolet (UV) radiation of a certain
wavelength (in this case 254 nm) 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 UV Sensor output and various other physical parameters of the
instrument and stores them in memory.
The microprocessor uses these calibration values, the UV absorption measurements
made on the Sample Gas in the Absorption Tube along with data regarding the
current temperature and pressure of the gas to calculate a final O
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 6.11 and 6.12) as well as reported to the user via a Front Panel Display or
a variety of digital and analog signal outputs.
P/N 04316 Rev: B
THEORY OF OPERATION
) in a sample gas drawn through the
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concentration.
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