What is the Multi-Gas Analyser used for?
The Multi-Gas Analyser is a multi-component gas analyser that measures hydrocarbon composition, CO₂ and H₂S in natural gas and other process gas streams. It also calculates heating value (BTU), Wobbe Index, and gas density for custody transfer, blending, fuel gas monitoring and process control applications.
How does the Multi-Gas Analyser work?
The Multi-Gas Analyser uses Tunable Filter Spectroscopy (TFS), an infrared absorption technique. A tunable Fabry-Perot optical filter scans specific wavelengths absorbed by different gas components. The analyser measures the absorption patterns and calculates gas composition without chemical reactions or carrier gases.
Which gases can the Multi-Gas Analyser measure?
A standard TFS2 can measure Methane (CH₄), Ethane (C₂H₆), Propane (C₃H₈), Iso-butane (i-C₄), Iso-pentane (i-C₅), combined n-butane, n-pentane, and n-hexane, Carbon dioxide (CO₂) and Hydrogen sulfide (H₂S). Additional measurement recipes may be available depending on the application.
What is the typical response time for the Multi-Gas Analyser?
The Multi-Gas Analyser provides fast response times, typically between 1 and 10 seconds depending on the application, sample conditions and required accuracy.
Does the Multi-Gas Analyser require carrier gas?
No. Unlike gas chromatographs (GCs), the Multi-Gas Analyser does not require carrier gas, fuel gas, or instrument air for measurement, reducing operating costs and maintenance requirements.
Does the Multi-Gas Analyser require routine calibration gas?
The Multi-Gas Analyser operates using a first-principle optical measurement method and normally does not require routine on-site calibration gas. However, periodic verification checks may be performed according to site quality procedures.
What is the measurement range of the Multi-Gas Analyser for H2S?
The Multi-Gas Analyser can measure hydrogen sulfide concentrations from approximately from 0.02% - 50% by volume or 200ppm - 500,000ppm, depending on the configuration and application.
What maintenance is required by Multi-Gas Analyser?
Routine maintenance for the Multi-Gas Analyser includes checking sample filters, inspecting tubing and fittings, verifying sample flow and reviewing analyser diagnostics. Because there are no analytical columns or carrier gases, maintenance requirements tend to be lower than those of conventional gas chromatographs.
Is the Multi-Gas Analyser suitable for hazardous areas?
Yes. The Multi-Gas Analyser is certified for Class I, Division 1 and 2, Groups B, C, and D hazardous locations when supplied in the appropriate enclosure. Always verify the certification of the installed unit before commissioning.
What applications commonly use the Multi-Gas Analyser?
Typical applications of the Multi-Gas Analyser include Natural gas processing, Gas transmission pipelines, Fuel gas monitoring, LNG and boil-off gas systems, Pipeline blending, Power generation, Acid gas and high-H2S streams, truck, railcar and ship unloading terminals. The analyser provides real-time composition data for process control and energy calculations.
What advantages does the Multi-Gas Analyser offer over conventional analysers?
Key advantages include fast response (1–10 seconds), no carrier gas required, no fuel gas required, low maintenance, continuous online operation, real-time BTU and Wobbe calculations, remote unattended operation and multiple gas components measured simultaneously. These features help reduce operating costs while providing rapid process feedback.
What can cause inaccurate Multi-Gas Analyser composition measurements?
Potential causes include contaminated sample gas, liquid carryover into the sample cell, plugged filters, incorrect pressure regulation, leaks in the sample system and improper analyser configuration. Maintaining a clean and representative sample is critical for accurate measurements.
What is the Multi-Gas Analyser's specific gravity?
±0.5% of Reading
Why is H2S measurement important?
H2S is toxic, corrosive and can negatively affect product quality. Monitoring H2S gas helps protect personnel, prevent equipment damage, meet pipeline specifications and ensure process efficiency.
What analyser technologies are used to measure H2S online?
Common technologies include lead acetate tape analysers, tunable diode laser (TDL) analysers, UV fluorescence analysers, electrochemical sensors and tunable filter spectroscopy analysers. The best technology depends on concentration range, accuracy requirements and application conditions.
What makes ppb and ppm different?
Ppm is parts per million, and ppb is parts per billion. 1 ppm equals 1,000 ppb. Pipeline and environmental applications often require measurements at very low ppb levels.
Can an online H2S analyser replace laboratory testing?
Online analysers provide continuous real-time measurements, while laboratory testing provides periodic verification. Many facilities use both methods to ensure data accuracy and compliance.
What are the benefits of continuous H2S gas monitoring?
Continuous monitoring provides real-time process visibility, faster response to upsets, improved safety, reduced corrosion risk, better product quality control, regulatory compliance and lower operating costs through early problem detection
Why might analyser readings differ from laboratory results?
Differences can occur because samples were taken at different times, process conditions changed, sampling methods differed, laboratory and analyser measurement uncertainties vary and sample handling affected H2S concentration
