LDS60 pages

© Siemens AG 2015

Continuous Gas Analyzers, in-situ
LDS 6
General information

■ Overview
LDS 6 is a diode laser gas analyzer with a measuring principle
based on the specific light absorption of different gas components. LDS 6 is suitable for fast and non-contact measurement
of gas concentrations in process or flue gases. One or two signals from up to three measuring points are processed simultaneously by the central analyzer unit. The in-situ cross-duct sensors
at each measuring point can be separated up to 700 m from the
central unit by using fiber-optic cables. The sensors are designed for operation under harsh environmental conditions and
contain a minimum of electrical components.

■ Application
Applications
• Process optimization
• Continuous emission monitoring for all kinds of fuels
(oil, gas, coal, and others)
• Process measurements in power utilities and any kind of
incinerator
• Process control
• Explosion protection
• Measurements in corrosive and toxic gases
• Quality control
• Environmental protection
• Plant and operator safety
Sectors
• Power plants
• Steel works
• Cement industry
• Chemical and petrochemical plants
• Automotive industry
• Waste incinerators
• Glass and ceramics production
• Research and development
• Semiconductor production

LDS 6, typical installation with cross-duct sensors

■ Benefits
The in-situ gas analyzer LDS 6 is characterized by a high availability and unique analytical selectivity, and is optimally suitable
for numerous applications. LDS 6 enables the measurement of
one or two gas components or - if desired - the gas temperature
directly in the process:
• With high dust load
• In hot, humid, corrosive, explosive, or toxic gases
• In applications showing strong varying gas compositions
• Under harsh environmental conditions at the measuring point
• Highly selective, i.e. mostly without cross-sensitivities

Special applications
In addition to the standard applications, special applications are
available upon request. These contain both an expansion of the
temperature and pressure range, as well as an expansion of the
concentration measuring range. Furthermore, other gas species
can be measured using special applications.

LDS 6 properties:
• Little installation effort
• Minimum maintenance requirements
• Extremely rugged design
• High long-term stability through built-in, maintenance-free
reference gas cell, field calibration is unnecessary
• Real-time measurements
Moreover, the instrument provides warning and failure
messages upon:
• Need for maintenance
- Erroneous reference function
- Bad signal quality
• Violation of a lower or upper alarm level for the measured
variable
• Transmitted amount of light violating an upper or lower limit

Siemens AP 01 · 2015

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