ABB LS4000 How it works – measuring principle

How it works – measuring principle

The LS4000 employs the optical measuring technique of absorption spectroscopy, which utilizes the fact that a

specific gas absorbs specific light wavelengths.

The light beam is emitted from a tunable laser diode located in the transmitter unit.

The laser light passes through the process gas and strikes the photodetector in the receiver unit.

The measured gas component present in the optical path absorbs the laser light, attenuating the light received.

A sophisticated signal algorithm processes the amount of light attenuation and calculates the gas concentration

on the basis of the Beer-Lambert law.

The influence of temperature and pressure variations is eliminated by dynamic automatic correction.

Sample components and measurement ranges

The LS4000 laser analyzer has one physical measurement range per sample component.

O2 from 0…1 to 0…100 Vol%

Typical applications

− Process and safety monitoring

− Combustion control

− Control of flue gas abatement equipment (e.g. ammonia slip measurements)

− Emission monitoring

Typical industries served

− Chemical and petrochemical industry

− Power industry

− Iron and steel industry

International certifications

− ATEX Zone 1

− IECEx Zone 1

− CSA Class I, Division 1