ABB LS4000 Tunable diode laser analyzer

The LS4000 is an in situ cross-duct analyzer for measuring gas component concentrations.

It applies the highly selective, optical measuring principle of tunable diode laser (TDL) absorption spectroscopy.

The LS4000 is a stand-alone system and is approved for use in hazardous areas according

to international standards. The device consists of a transmitter unit with a laser light source and a receiver

unit with a photodetector. The two units are mounted opposite each other on the process pipe or stack and are

connected by a junction box.

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