Gas Analyser FAQ

What is a Gas Analyzer?

Gas Analyzer is an instrument used to measure the concentration of a known gas in given mixture of gases from a process / stream.

Why are Gas Analyzer Used?

Gas Analyzer is used to Monitor Process, Enhance Safety, Increase Efficiency, Monitor Emission and Improve Quality.

Where are Gas Analyzer used?

They are used in applications in all major industries such as Refineries & Petrochemicals, Chemical Plants, Critical process, Inerting Applications, pharmaceuticals, Fertilizers, Glass, semiconductors, Boilers, Heaters, Thermal crackers, Incinerators, continuous monitoring of Stack, Industrial gas producers and its users

What is the difference between Gas Detectors and Analyzers?

Detectors detect situations outside normal operating parameters and are set up to alarm.
Analyzers determine in real time, the quantity/concentration a said gas is in the stream / Process.

What is the different measurement techniques used in Gas Analyzers?

There are many different sensors used to analyze gases. Types of popular sensors include Electrochemical, Paramagnetic, Thermal conductivity, Infrared, PID, FID etc.

Why are different kinds of sensors used?

The sensors are designed to detect / measure the unique physical or chemical properties of gases. Hence to distinguish between different gases in a mixture of gases (a process or a stream) different sensor techniques are used.

Further Sensor choice also depends upon required accuracy, specifications, life expectancy and cost.

Does Gas Analyzer equipment need maintenance and calibration?

Yes. However in a properly Designed and commissioned system Maintenance requirement is minimal and may only consist of a visual inspection and verification of operative parameters and periodic replacements of consumables.

Calibration frequency depends on sensor type, criticality of application and accuracy requirement of the process.

What is calibration?

Calibration verifies that the Analyzer is operating properly and adjusts for any sensor drift or loss of sensitivity. The process involves passing two known certified concentration of the target gas – one for Low/Zero Point and other for High/Span Point – usually from a calibration gas cylinder and allowing the Analyzer to adjust for drift in the reading.

What is cross-sensitivity?

Cross-sensitivity refers to the response of a sensor to a gas other than the target gas (also called an interference gas).

What is NOx?

A group of compounds mostly formed with Nitrogen and Oxygen as a byproduct of combustion are called NOX – Nitric Oxide (NO), Nitrogen Dioxide (NO2), Nitrous Oxide (N2O), N2O3, N2O4, N2O5, N3O4 and NO3.

What does PPM mean?

Parts Per Million – 1 % volume = 10,000 ppm.