The system of online analyzers can be defined into two general categories according to the installation:

In situ analyzer
Extractive analyzer

In in situ analyzers, the analysis is performed directly on the process line without necessity for a sampling system.

In the Extractive online analyzer system, the sampling system has a very important role in controlling parameters such as temperature, pressure, flow and removal of pollutions, as well as transferring the sample to the analyzer, resulting in more accurate measurements and increasing the life of the analyzer.

The main items of the sampling system are the following:

Sampling probe

Heat exchanger

Pressure relief valve

Filter

Temperature and pressure indicator

Different types of absorbers

Types of valves

pump

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