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Analyzer measuring
principle
OI/LS4000/NH3/H2O-EN
The LS4000 uses the optical measurement method of tunable diode laser
absorption spectroscopy (TDLAS), which is based on the fact that gases ab-
sorb light of specific wavelengths.
In this method, a configurable laser diode in the transmitter unit emits a laser
beam, which passes through the process gas and shines onto the photode-
tector in the receiver unit. The molecules of the measuring components lo-
cated in the optical path of the laser beam absorb the laser light, thereby
reducing the light intensity at the receiver.
A sophisticated signal algorithm records the measured reduction in light in-
tensity and uses this value to calculate the gas concentration in accordance
with the Beer-Lambert law. The influence of temperature and pressure varia-
tions is eliminated by a dynamic automatic correction function.
Operating instruction LS4000 for NH
and H
O
3
2
7
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