Gas Analyzers Selection- 4 Things to know!

The need for effective process / quality control, environmental monitoring and compliance with statutory directives among other factors have made process gas analyzers indispensable for various applications in the process industry. However, certain factors need to be considered in the selection of gas analyzers for effective process monitoring/control. Some of the basic selection criteria are as follows:

  1. Measuring Method: Different measuring method/detection principles are available for specific applications. i. NDIR principle: The non-dispersive infrared principle is suitable for the measurement of infrared-active components such as CO, CO2, SO2, NO, H2O, CH4 as well as other hydrocarbons.
  2. Paramagnetic Alternating Pressure Principle: In complex applications, the concentration of oxygen can be measured according to the Paramagnetic principle.

iii.        Flame-Ionization Principle: The total hydrocarbon content of a sample mixture can be measured based on the flame ionization principle.

  1. Thermal Conductivity: Thermal conductivity detector is suitable for the detection of hydrogen and inert gases in binary as well as corrosive gas mixtures.

While some processes adopt a single detection principle, others employ more than one. For example, the measurement of toxic gases and oxygen in the same process typically combines the infrared and paramagnetic principles.


  1. Measured Components OR Component Analysis (Mono or Multi): Due consideration should be given to the total number of gas components to be measured during process analysis. A process may require measurement of one, two or more components, depending on the complexity of the process.
  2. Detection Limit: The desired limit of detection of the target gas(es) is a major factor to also consider in the selection of process gas analyzers. This could range from 0 – 200 ppm or more.
  3. Sample Gas Conditions: Temperature and Pressure: Basically, the sample gas should exist at a temperature below its dew point or as recommended by the process design, while the absolute pressure should align with design specification.

GIL Automations has garnered apt expertise in providing support in the selection, installation, commissioning and maintenance of various process gas analyzers. We have trained technicians and Engineers with multi-OEM capabilities. Please contact us today for your Gas Analysis, Emission monitoring systems or Gas Chromatography needs.

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