ABB DKTFM418B 3BHB015651P0001 Power Converter

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.

The advantages to you:

High precision

Due to the narrow spectral width of the laser beam and the narrow scan window, only the absorption by the target gas

component is measured. Consequently, high selectivity and accuracy are achieved and the measurement is virtually

cross-interference free.

Suitable for harsh process conditions

LS4000 applies a non-contact, optical technique, which allows the measurement of corrosive, toxic and hazardous

gas streams directly in the process. The laser analyzer is suitable for measurements at elevated temperatures up

to 1500 °C (2732 °F) and pressures up to 20 bar (290 psi).

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

Fast and direct

A sampling and conditioning system is unnecessary since the instrument is directly installed on the process (in situ).

This results in a typical response time of 2 seconds, providing better loop control and faster detection of critical conditions.

The in situ laser analyzer is ideally suited for process optimization and safety measurements.

Safe, compact and easy

− No purging for installations in hazardous areas – the analyzer includes flameproof housing (Ex-d) with

international certifications

− No nitrogen purging of the analyzer housing for O2 measurement

− Insensitive to vibrations through compact and lightweight design

− Ease of maintenance

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