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An instrument or system which measures and detects chemical properties or composition of a stream is called analyzer. Selection of an appropriate analyzer requires many considerations such as process condition and analyzerlimitations and application.
There is a wide range of analyzers available for a typical application. An engineer should select among them based on the application requirements.
To get the best performance of analyzer, it is usually necessary to use a sample handling system. sampling systems has many advantages such as: Providing better accuracy and reliability of measurement, extending analyzer life, Limiting analyzer maintenance and associated parts and labor as well as facilitating field calibration.
There are two major category of analyzers based on process fluid; Gas Analyzers and Liquid Analyzers.
Tunable Diode Laser Spectroscopy Analyzer (TDLS)
Measuring the concentration of certain species e.g. Methane, Water vapor etc.
Very low detection capability
Possible to determine temperature, pressure, velocity and mass flow
Measurement of proportion of O2 in gas or liquid
Zirconia oxide for non-flammable gases
Paramagnetic oxygen analyzer for measuring percent level of oxygen
Infrared Gas Analyzers
Measurement of trace gas by determining of absorption of an emitted IR light
CO, CO2, CH4, SO2, NOx etc.
Gas molecules interact with light only
Application in Direct Reduction units and Oil & gas plants
Gas Chromatograph (GC)
Used to determine organic compound in a gas that can be vaporized due to differencies in their partitioning behavior
Thermal Conductivity Detector (TCD), non-specific and non-destructive
Flame Ionization Detector (FID), most sensitive GC
CEMS (Continuous Emission Monitoring Systems)
Combustion control and monitor fuel gas for CO2, CO and O2
Continuously collect, measure and report the emission data
Insitu or Extractive types
Process analyzer sampling systems
PH and ORP Analyzers
Used to measure PH level of a solution
Heavy duty, high pressure capability
Gel compact electrode
Measurement acc. to concentration, mobility and valence no. of Ion and Temperature