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Handling

The personnel must be skilled and experienced in

unpacking and transporting heavy equipment.

Responsibilities of the user

It is the responsibility of those in charge of the

drive to ensure that each person involved in the

installation, operation or maintenance of the drive

has received the appropriate training and has thor

oughly read and clearly understood the instruc

tions in this manual and the relevant safety

instructions.

Mechanical installation

The personnel must be qualified to prepare the

installation site according to the site and equip

ment requirements and to perform the installation

accordingly.

Complete. From sampling to measurement.

• With gas sampling, sample conditioning and gas analyzer

• Certified AO2000 series analyzers

• Physically and digitally integrated sample handling

• Inclusive system control and self-monitoring

• For installation in non-hazardous area

Configurable. Tailored to your needs.

• Pre-engineered for known applications

• Adaptable to even the most challenging appli-cations

• In sheet steel or glass-fiber cabinet or onmounting plate

• Automated generation of system drawings

• Integration of external signals for example,

dust, p, T, V and mercury to transmit to DCS or DAHS

Consistent. The quality you expect.

• Produced in Germany

• Easy operation via front door

• Familiar and service-friendly internal layout

World leading AO2000 analyzer modules

•  Uras26 or Limas21 UV photometers

• Magnos28 or Magnos27 paramagnetic oxygen

analyzers or electrochemical oxygen sensor

• Fidas24 flame ionization detector

• Caldos25 or Caldos27 thermal conductivityanalyzers

Automatic calibration normally with air and inte

grated calibration cells, i. e. without use of testgas bottles

Options

• Dual Sampling for simultaneous measurement

at two different sampling locations

• Dual Switching for measurement at two sam

pling locations or for uninterrupted measure

ment at one sample location for CO monitoring

Approvals

CSA approval for ‘General Purpose’ use

improper

Improper use

The following are considered to be instances of especially

improper use of the device:

• For use as a climbing aid, for example for mounting purposes.

• For use as a bracket for external loads, for example as a support for piping, etc.

• Material application, for example by painting over the

housing, name plate or welding/soldering on parts.

• Material removal, for example by spot drilling the housing.

Warranty provisions

Using the device in a manner that does not fall within the scope

of its intended use, disregarding this manual, using

underqualified personnel, or making unauthorized alterations

releases the manufacturer from liability for any resulting

damage. This renders the manufacturer’s warranty null and void.

Introduction

As an integrated part of the Advance Optima series the LS25

can be combined with further analyzer modules and completely operated remotely in Ethernet networks.

The LS25 has ATEX, IECEx and CSA certificates for use in potentially explosive atmospheres.

The power supply unit converts 100-240 volts AC to 24 volts DC (24 volts DC can be supplied directly to

the transmitter unit if available).

The power supply box is connected to the transmitter box by a cable. 4-20 mA input signal from external

gas temperature/pressure sensor

can be connected to the screw terminals in the power supply box or directly to the cable connector on

the transmitter unit.

The receiver electronics are connected to the transmitter electronics via a cable.

The absorbed signals detected from the photodetector are amplified and transmitted via this cable to the

transmitter unit.

The same cable transmits the required power supply from the transmitter unit to the receiver unit.

The transmitter Al box contains the main electronic components.

The central processor board performs all instrument control and gas concentration calculations.

The main board contains all the electronics required for the operation of the instrument,

such as the diode laser current and temperature control as well as the analogue to digital signal

conversion.

The display (LCD) continuously shows the gas concentration, laser beam transmission and instrument

status.

an RS-232 port is available for direct serial communication with a PC.

An optional Ethernet board provides TCP/IP communication over a local area network (LAN) as an

alternative to serial communication.

All cable connectors are Phoenix VARIOSUB type and are waterproof.

Instrument Description

The analyser consists of 3 separate units:

 Transmitter unit with decontamination

 Receiver unit with decontamination

 Power supply unit

The transmitter unit consists of the laser module, the temperature stabilised diode laser,

the collimating optics and the main electronics in a coated aluminium case.

The receiver unit contains a focusing lens, photodetector and receiver electronics in a coated aluminium

case.

Both the transmitter and receiver have an environmental protection rating of IP66.

The standard optical window is pressure resistant up to 5 bar (absolute pressure).

The monitor is mounted by assembling the transmitter and receiver with the supplied

purge and calibration unit and mounting to a DN50 process flange (see Figure 3-1).

Optical alignment is both simple and reliable, and the purge device prevents dust

and other contaminants from being deposited on the optical window.

The detector signal is spectrally decomposed into harmonic frequency components of the laser

modulation frequency.

The second harmonic of the signal is used to measure the concentration of the absorbed gas.

Both line amplitude and line width are Both line amplitude and line width are extracted from the second

harmonic line shape.

Therefore the measured concentration is not sensitive to changes in the line shape (line amplitude and

line width).

The measured concentration is not sensitive to line shape changes (line width and line width) caused by

background gases.

Note: The analyser measures only the concentration of free molecules in a given gas and is therefore not 

sensitive to molecules bound to other molecules in complexes and molecules attached to or dissolved in

particles and droplets.

Care should be taken when comparing results with those obtained by other measurement techniques.