Process Gas Analysis
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Introduction
Process Gas Analysis is an important part of modern industrial process control, safety, quality management and environmental monitoring. Continuous measurement of gases allows industries to understand what is happening inside their processes and take corrective action when gas composition changes.
A Gas Analyzer measures the concentration of one or more gases in a process stream. Depending on the application, analyzers can measure gases such as:
Oxygen (O₂)
Carbon monoxide (CO)
Carbon dioxide (CO₂)
Hydrogen (H₂)
Methane (CH₄)
Nitrogen (N₂)
Ammonia (NH₃)
Hydrogen sulfide (H₂S)
Sulfur dioxide (SO₂)
Nitrogen oxides (NOx)
Water vapour (H₂O)
Hydrocarbons
Other process-specific gases
Process gas analysis is used across power generation, steel, cement, oil and gas, petrochemical, chemical, fertilizer, pharmaceutical, food and beverage, hydrogen and other industries.
The correct Industrial Gas Analyzer depends on the gas composition, concentration range, process temperature, pressure, moisture, particulate loading and required accuracy.
What Is Process Gas Analysis?
Process gas analysis is the measurement of the composition and concentration of gases generated, consumed or transported during an industrial process.
Unlike laboratory gas testing, process gas analysis is often performed continuously or at frequent intervals.
The information obtained can be used for:
Process optimization
Combustion control
Product-quality control
Energy optimization
Emission monitoring
Equipment protection
Safety monitoring
Process troubleshooting
Regulatory compliance
For example, an industrial furnace may use an O₂ and CO analyzer to monitor combustion conditions.
A hydrogen plant may require H₂ purity, O₂ and moisture measurement.
A refinery may require analysis of hydrogen, hydrocarbons, H₂S and other process gases.
Why Is Process Gas Analysis Important?
Industrial processes can change rapidly.
Temperature, feed composition, air supply, pressure and other operating parameters can influence gas composition.
Continuous gas measurement gives operators real-time information.
Process optimization
Gas concentration measurements can help optimize operating conditions.
Energy efficiency
Combustion analyzers can help maintain appropriate air-to-fuel conditions.
Product quality
Gas composition can affect the quality of manufactured products.
Safety
Monitoring combustible or toxic gases can provide an early indication of abnormal conditions.
Environmental performance
Gas analyzers can monitor emissions and support environmental-control systems.
Equipment protection
Abnormal gas concentrations can indicate conditions that may damage process equipment.
Gas Analyzer Working Principle
The Gas Analyzer Working Principle depends on the analytical technology selected for the gas and application.
Common technologies include:
NDIR
Paramagnetic
Electrochemical
Thermal conductivity
Tunable diode laser spectroscopy
Gas chromatography
Zirconia
UV spectroscopy
Flame photometric detection
Mass spectrometry
Each technology has different strengths.
The analyzer should therefore be selected according to the target gas, concentration range and process conditions.
Common Gas Analyzer Technologies
NDIR Gas Analyzer
NDIR stands for Non-Dispersive Infrared.
The analyzer passes infrared radiation through the gas sample.
Certain gas molecules absorb infrared radiation at characteristic wavelengths.
The amount of absorption is related to gas concentration.
NDIR analyzers are commonly used for:
CO
CO₂
CH₄
Other infrared-active gases
Paramagnetic Gas Analyzer
Paramagnetic analyzers are widely used for oxygen measurement.
Oxygen has strong paramagnetic properties.
The analyzer measures the magnetic response of the gas and converts it into an oxygen concentration.
Applications include:
Boiler combustion
Furnace control
Process monitoring
Gas-quality analysis
Electrochemical Gas Analyzer
Electrochemical sensors measure a gas through an electrochemical reaction.
They can be used for selected gases such as:
O₂
CO
H₂S
SO₂
Other gases depending on sensor design
They are available in portable, fixed and process configurations.
Thermal Conductivity Analyzer
Thermal Conductivity Analyzers determine gas concentration based on differences in thermal conductivity.
Hydrogen is an important application because of its high thermal conductivity.
Typical applications include:
Hydrogen purity
Hydrogen generators
Ammonia plants
Heat treatment
Industrial gas systems
Tunable Diode Laser Gas Analyzer
A TDL analyzer uses a tunable laser to measure gas absorption at a selected wavelength.
TDL technology can provide highly selective measurements for suitable gases.
Applications include:
O₂
H₂O
NH₃
CO
CO₂
Other gases depending on the laser wavelength
TDL systems can be configured for in-situ or extractive measurement.
Gas Chromatography for Process Gas Analysis
Gas chromatography is particularly useful when multiple components must be separated and quantified.
A GC system typically consists of:
Sample → Injection → Separation Column → Detector → Data Processing
GC can be used to analyze:
Hydrogen
Oxygen
Nitrogen
Carbon monoxide
Carbon dioxide
Methane
Other hydrocarbons
Process-specific components
GC is commonly used where detailed multi-component gas analysis is required.
Zirconia Oxygen Analyzer
Zirconia-based oxygen analyzers use a solid-state electrolyte to determine oxygen concentration.
They are widely used for:
Furnace monitoring
Boiler applications
Combustion control
High-temperature processes
They can be particularly useful for applications involving hot flue gas.
Process Gas Analyzer Applications
Process gas analyzers are used in many industries.
Power Plants
Gas analysis is commonly used for combustion optimization and emission monitoring.
Typical measurements include:
O₂
CO
CO₂
NOx
SO₂
Applications include:
Boiler monitoring
Combustion optimization
Flue-gas analysis
CEMS
DeNOx monitoring
Process Gas Analysis in Steel Plants
Steel plants contain numerous furnaces and process-gas systems.
Gas analyzers can be used for:
Furnace atmosphere control
Combustion optimization
Coke oven gas monitoring
Blast furnace gas analysis
Heat-treatment processes
Potential gases include:
O₂
CO
CO₂
H₂
CH₄
Other hydrocarbons
Process Gas Analysis in Cement Plants
Cement production involves high-temperature combustion and kiln processes.
Gas analysis can help monitor:
O₂
CO
CO₂
NOx
SO₂
NH₃
Applications include:
Kiln monitoring
Preheater monitoring
Combustion control
Emission monitoring
Process optimization
Reliable gas measurement can help operators identify incomplete combustion and changes in kiln conditions.
Process Gas Analysis in Refineries
Refineries use gas analysis throughout multiple process units.
Potential applications include:
Hydrogen monitoring
Fuel-gas analysis
Flare monitoring
Hydrocarbon analysis
H₂S monitoring
Process optimization
Gas chromatography can be useful when several hydrocarbon components must be measured.
Process Gas Analysis in Petrochemical Plants
Petrochemical processes often require detailed monitoring of process-gas composition.
Applications may include:
Reactor monitoring
Feed-gas analysis
Product-gas analysis
Hydrocarbon analysis
Hydrogen monitoring
Process optimization
The analyzer technology should be selected based on the specific process.
Process Gas Analysis in Chemical Plants
Chemical processes may involve toxic, corrosive, flammable or reactive gases.
Gas analysis can support:
Reaction control
Process optimization
Gas-quality monitoring
Safety monitoring
Emission monitoring
Potential gases include:
CO
CO₂
NH₃
HCl
H₂S
SO₂
VOCs
Other process-specific gases
Process Gas Analysis in Fertilizer Plants
Fertilizer plants use several important process gases.
Applications may include:
Ammonia monitoring
Hydrogen analysis
Nitrogen analysis
Syngas analysis
CO/CO₂ monitoring
Gas chromatography and other technologies can be selected according to the process.
Process Gas Analysis in Hydrogen Plants
Hydrogen production is an increasingly important industrial application.
Gas analysis may be required at:
Electrolyzer outlet
Hydrogen purification
Dryer outlet
Compressor outlet
Storage
Dispenser
Potential measurements include:
H₂
O₂
N₂
H₂O
CO
CO₂
CH₄
The appropriate analyzer depends on the required hydrogen purity and impurity limits.
Process Gas Analysis in Oil and Gas
Oil and gas facilities use gas analyzers for both process control and safety.
Applications include:
Natural gas analysis
Fuel-gas monitoring
Hydrogen monitoring
H₂S measurement
Hydrocarbon analysis
Flare gas analysis
Gas chromatography is often considered when detailed hydrocarbon composition is required.
Process Gas Analysis in Pharmaceutical Manufacturing
Pharmaceutical processes can require controlled gas environments.
Gas analysis may be used for:
Oxygen monitoring
Carbon dioxide monitoring
Nitrogen purity
Process gas quality
Controlled-atmosphere applications
Analyzer selection depends on the process and required gas-quality specifications.
Process Gas Analysis in Food and Beverage
Gas analysis is important in applications involving controlled atmospheres and packaging.
Potential measurements include:
O₂
CO₂
N₂
Applications include:
Modified-atmosphere packaging
Beverage processing
Food storage
Gas-quality monitoring
Process Gas Sampling System
A process analyzer does not operate independently of the sampling system.
A typical extractive system may include:
Process → Sampling Probe → Filter → Pressure Reduction → Cooling/Conditioning → Flow Control → Gas Analyzer
Depending on the process, the system may also require:
Heated sample lines
Filters
Sample cooler
Moisture separator
Pressure regulator
Flow meter
Automatic valves
Calibration system
Correct sample-system design is critical to reliable analysis.
Extractive Gas Analysis
In an extractive system, gas is withdrawn from the process and transported to the analyzer.
Advantages can include:
Controlled sample conditions
Easier analyzer maintenance
Analyzer installation away from harsh process conditions
Multiple sample-point capability
However, the sample line must be designed to prevent:
Condensation
Gas loss
Contamination
Reaction
Particulate blockage
In-Situ Gas Analysis
In-situ analyzers measure gas directly in the process duct or stack.
Examples include optical analyzers installed across a duct.
Advantages may include:
Reduced sample handling
Fast response
Direct process measurement
Lower sample-conditioning requirements
Potential challenges include:
Dust
Optical-window contamination
Alignment
High temperature
Purging requirements
Multi-Point Process Gas Analysis
Large industrial plants may require measurement from several process locations.
A single analyzer can sometimes be connected to multiple sampling points through an automatic sample-selection system.
A typical arrangement is:
Sample Point 1 → Valve Manifold
Sample Point 2 → Valve Manifold
Sample Point 3 → Valve Manifold
↓
Gas Analyzer
Important considerations include:
Sample switching time
Sample-line length
Dead volume
Cross-contamination
Purging
Pressure
Flow
Required measurement frequency
For critical applications, separate analyzers may be more appropriate.
Calibration of Process Gas Analyzers
Calibration helps maintain measurement accuracy.
Depending on the technology, calibration may involve:
Zero gas
Span gas
Certified reference gas
Multi-point calibration
Automatic calibration
Calibration frequency depends on:
Analyzer type
Application
Gas composition
Process conditions
Accuracy requirement
Regulatory requirements
Maintenance of Industrial Gas Analyzers
Routine maintenance can include:
Checking sample flow
Inspecting filters
Checking sample lines
Leak testing
Calibration
Sensor inspection
Checking pressure regulators
Checking pumps
Cleaning optical components
Reviewing analyzer diagnostics
Maintenance requirements vary considerably between analyzer technologies.
Data Acquisition and Communication
Modern Industrial Gas Analyzer systems can communicate with plant automation systems.
Typical interfaces include:
4–20 mA
RS485
Modbus RTU
Modbus TCP
Ethernet
Analyzer data can be integrated with:
PLC
DCS
SCADA
Data acquisition system
Plant historian
This allows operators to monitor trends and alarms from the control room.
Process Gas Analysis and CEMS
Continuous Emission Monitoring Systems use gas analyzers to measure specified pollutants and other parameters in industrial emissions.
Depending on the application, CEMS may monitor:
SO₂
NOx
CO
CO₂
O₂
Other pollutants
A complete CEMS can include:
Sampling system
Gas analyzer
Sample conditioning
Calibration
Data acquisition
Data transmission
Reporting
The system should be designed according to applicable regulatory requirements.
How to Select an Industrial Gas Analyzer
Selecting an Industrial Gas Analyzer requires detailed process information.
1. Identify the target gas
Determine which gas or gases need to be measured.
2. Define the measurement range
Provide minimum and maximum concentration.
3. Specify detection limit
This is particularly important for trace-level measurements.
4. Provide gas composition
List all major gases and potential interferents.
5. Provide process temperature
Specify normal and maximum temperature.
6. Provide pressure
Specify operating and maximum pressure.
7. Check moisture
Determine whether the sample is wet or dry.
8. Check dust
Particulate concentration can affect sampling and optical measurement.
9. Select installation type
Choose:
In-situ
Extractive
Laboratory
Portable
10. Define communication
Specify:
4–20 mA
Modbus
Ethernet
Other protocols
Gas Analyzer Price in India
The Gas Analyzer Price in India varies considerably depending on the application and analytical technology.
Factors affecting the price include:
Gas or gases being measured
Measurement range
Detection limit
Accuracy
Analyzer technology
Number of channels
Sample-conditioning system
Sampling pressure
Sampling temperature
Hazardous-area requirements
Calibration system
Data acquisition
Communication
Control panel
Installation
Commissioning
Warranty
Service support
A basic single-gas analyzer can therefore have a very different price from a complete multi-gas process-analysis system.
Customers should provide complete technical details before comparing quotations.
What Is Included in a Process Gas Analysis System?
Depending on the application, a complete package may include:
Gas analyzer
Sampling probe
Sample-conditioning system
Filters
Pressure regulators
Flow control
Sample pump
Heated sample line
Calibration system
Control panel
Data acquisition
Communication interface
Installation
Commissioning
Training
Warranty
The final scope should be clearly defined in the technical and commercial offer.
Common Process Gas Analysis Problems
Incorrect sample point
A non-representative sample can result in inaccurate analysis.
Condensation
Condensation can alter gas composition or damage the sampling system.
Filter blockage
Particulate accumulation can restrict sample flow.
Calibration drift
Regular verification can help identify analyzer drift.
Sample-line leakage
Leaks can dilute the sample or allow air ingress.
Pressure fluctuations
Uncontrolled pressure can affect analyzer operation.
Optical contamination
Dust and deposits can affect optical analyzers.
Proper application engineering can minimize these problems.
Benefits of Online Process Gas Analysis
Online gas measurement provides several advantages.
Real-time information
Operators can observe process changes immediately.
Better process control
Gas data can be integrated with plant control systems.
Improved efficiency
Combustion and process conditions can be optimized.
Reduced product losses
Abnormal process conditions can be identified earlier.
Improved safety
Hazardous or abnormal gas concentrations can be detected.
Better documentation
Historical data can support process analysis and troubleshooting.
Laboratory vs Online Process Gas Analysis
ParameterOnline AnalysisLaboratory AnalysisMeasurementContinuous/frequentPeriodicResponseFastSlowerProcess trendsExcellentLimitedAutomatic alarmsPossibleUsually manualProcess integrationHighLimitedSample handlingAutomatedManualDetailed analysisTechnology-dependentOften extensive
Many industrial plants use both online and laboratory analysis to achieve reliable process control and verification.
Frequently Asked Questions
What is Process Gas Analysis?
Process Gas Analysis is the measurement of gas composition within an industrial process to support process control, optimization, safety, product quality and environmental monitoring.
What is a Gas Analyzer?
A Gas Analyzer is an instrument that measures the concentration of one or more gases in a sample.
What is the Gas Analyzer Working Principle?
The principle depends on the technology. NDIR uses infrared absorption, paramagnetic analyzers measure oxygen's magnetic properties, thermal conductivity analyzers measure heat-transfer characteristics, and GC systems separate gases before detection.
Which gases can be measured?
Depending on the analyzer, gases such as O₂, CO, CO₂, H₂, CH₄, N₂, NH₃, H₂S, SO₂, NOx and H₂O can be measured.
What is an Industrial Gas Analyzer?
An Industrial Gas Analyzer is designed or configured for gas measurement in industrial processes, often with appropriate sampling, conditioning, communication and environmental protection.
Should I select an extractive or in-situ analyzer?
It depends on process conditions. In-situ systems can reduce sample handling, while extractive systems provide greater control over sample conditions.
Can one analyzer measure multiple gases?
Yes, depending on the analytical technology. Multi-gas systems can use multiple sensors, optical channels or chromatographic separation.
Can one analyzer monitor multiple process points?
Yes, suitable systems can use automatic sample switching. However, response time and sample-line effects must be considered.
What is the Gas Analyzer Price in India?
There is no single price. Cost depends on the analytical technology, gases, ranges, detection limits, sampling system, process conditions, communication, installation and other requirements.
How often should a process gas analyzer be calibrated?
The required frequency depends on the analyzer, application and regulatory requirements. Manufacturer recommendations should be followed.
Conclusion
Process Gas Analysis is essential for many modern industrial operations. Continuous measurement of gas composition provides valuable information for process optimization, quality control, safety, energy management and environmental monitoring.
The correct Gas Analyzer depends on the gas being measured and the process conditions. Technologies such as NDIR, paramagnetic, electrochemical, thermal conductivity, TDL, zirconia and gas chromatography each have specific applications.
For complex industrial applications, analyzer selection should consider:
Target gases
Measurement range
Detection limit
Gas composition
Temperature
Pressure
Moisture
Dust
Sampling arrangement
Calibration
Communication
Data acquisition
The Gas Analyzer Price in India depends on the complete analytical package rather than the analyzer alone. Sampling systems, conditioning equipment, calibration systems, control panels, communication and installation can all influence the total project cost.
A properly engineered Industrial Gas Analyzer system can provide reliable process information and help industries improve efficiency, maintain quality and respond quickly to process changes.
Need a Process Gas Analysis Solution?
Prosoft Automation provides industrial analytical instrumentation solutions for process and gas-analysis applications.
Our application team can help evaluate:
Target gas and gas composition
Measurement range
Detection limits
Process temperature
Process pressure
Moisture and dust
Extractive or in-situ measurement
Sampling and conditioning
Multi-point sampling
Data acquisition
PLC/DCS/SCADA integration
Calibration requirements
Installation and commissioning
Request a quotation for this analyzer
Send us your process description, gas composition, gases to be measured, measurement range, process temperature, pressure and sampling-point details. Our application specialists can recommend a suitable Gas Analyzer and prepare a project-specific quotation.
Prosoft Automation — Process Gas Analysis & Industrial Analytical Instrumentation Solutions