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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.

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.

For low voltage applications

• High fidelity auxiliary contacts for applications where it is necessary to detect starter or

contactor operation with circuits that use low voltage levels, such as programmable

controls or computer systems

• Control amplifier is available for applications with low level 24 V DC outputs to operate 300-line

contactor and starter control coils at line voltag Coil kits adapt for different voltages

• Encapsulated coils in kit form enable you to change contactor coils for different voltages

• Coils are rated up to 600 volts, 50 and 60 hertz

• Coil changes are quick and easy

Surge suppression kits provide protection and are designed to meet the demands of

solid-state circuitry

• Prevent undesirable reactions in logic circuits by using an RC network to absorb energy surges

from opening the coil circuit

• Eliminate the need to install a separate resistor and capacitor network

• Easy to install and requires only one wire connection — the mounting plate makes the other

electrical connection

• Unit installs neatly on the contactor coilretaining clip

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