The COSA XENTAUR™ 9610 CXc™ Online BTU Analyzer provides continuous measurement of Heating Value (BTU), Wobbe Index, Calorific Value, and Combustion Air Requirement Index (CARI) for fuel gas, natural gas, refinery gas, flare gas, hydrogen blends, biogas, and renewable natural gas (RNG).
Designed for real-time combustion control and fuel quality monitoring, the 9610 CXc helps operators optimize burners, boilers, furnaces, turbines, and flare systems while reducing fuel costs, improving efficiency, and minimizing emissions.
Using a proven residual oxygen measurement principle with catalytic combustion, the analyzer delivers fast response, exceptional accuracy, and long-term reliability without the flame stability concerns associated with traditional combustion calorimeters.
RESIDUAL OXYGEN MEASUREMENT
Our 9610 CXc BTU Calorimeter for Wobbe Index measurement is based on the analysis of the oxygen content in the flue gas after combustion of the sample. A continuous gas sample is mixed with dry air at a precisely maintained constant ration, which depends on the BTU range of the gas to be measured. The fuel air mixture is oxidized in a combustion furnace in the presence of a catalyst at 800°C, and the oxygen concentration of the combusted sample is measured by a zirconia oxide cell.
Why Measure BTU, Wobbe Index & CARI?
Fuel gas composition changes continuously in industrial processes.
Variations in heating value directly affect:
- Combustion efficiency
- Flame stability
- Burner performance
- Furnace temperature
- Turbine efficiency
- Steam generation
- Product quality
- Emissions
- Fuel costs
Continuous online measurement allows operators to adjust combustion conditions immediately instead of relying on delayed laboratory analysis.
Why Choose the 9610 CXc?
Unlike conventional gas chromatographs that may require longer analysis cycles, the 9610 CXc provides continuous, real-time combustion measurements with fast response and minimal maintenance.
Key Benefits
- Continuous BTU monitoring
- Continuous Wobbe Index measurement
- Continuous Heating Value analysis
- Continuous CARI measurement
- T90 response time under 5 seconds (Wobbe)
- Measures BTU values from 0–3000 BTU/scf
- Flameless catalytic combustion
- No flameouts
- Low maintenance
- Outdoor installation capability
- Hazardous-area certifications
- Optional integrated hydrogen measurement
- 20+ years of field-proven reliability
What Does the 9610 CXc Measure?
The analyzer continuously calculates:
- Heating Value (BTU)
- Gross Calorific Value
- Wobbe Index
- Combustion Air Requirement Index (CARI)
- Specific Gravity (optional)
- Hydrogen concentration (optional)
This combination allows operators to optimize both combustion energy and air-to-fuel ratio for maximum efficiency.
Features
Some of the features of using the 9610 CXc BTU Calorimeter include:
- High Accuracy: Provides highly accurate results for measuring the calorific value of fuels, with a precision of +/-0.2%.
- Large Measurement Range: Has a wide measurement range, making it suitable for measuring the heating value of various liquid and gaseous fuels.
- Fast Response Time: Has a fast response time, providing results within minutes, making it suitable for real-time monitoring and control of fuel quality. T90 < 5 sec Wobbe only and T90 ≥ 10sec with *Density cell (* Streaming option for<5 seconds).
- Measures Low BTU Gases
- Low Maintenance
- Flameless/ No Flameouts
- Measures Wobbe and CARI
- Hazardous Area Approved
- No Special Enclosure Required for Outdoor Use
Additional Features
- Integrated optional pumps for sample control of inlet and outlet.
- Internal sample system up to 50°C with options to 100°C
- Full measurement range 0-3000 BTU/SCFH option
- Hydrogen Measurement fully integrated into analyzer including power and communications.
BENEFITS
Some of the benefits of using the 9610 CXc BTU Calorimeter include:
- Low Sample Volume: Requires a small sample volume, which reduces the amount of fuel required for testing and minimizes waste.
- Easy to Operate: Easy to operate, with a user-friendly interface and intuitive controls.
- Durable: Made of high-quality materials and is designed for durability and long-term use.
- SCC at 50°C and 100°C
- Bypass stream to flare
- Furnace at 800°C
- O2 Cell in furnace
- SG Cell required for BTU
- 20+ years pf proven reliability
- Standing mount included
- Large cabinet area ease of maintenance
- Global service and repairs
- Optional SG Cell for BTU measurement
- Certified: US/Canada: Class I, Division 2, Groups A, B, C, D IP66, ATEX: II 2 G Ex ib px IIC T3 Gb Ta = +5°C to +45°C; IP66, IECEx: Ex ib pxb IIC T3 Gb Ta = +5°C to +45°C; IP66
Measurement Principle (Residual Oxygen Measurement)
The 9610CXc BTU Calorimeter uses the measuring principle based on the analysis of the residual oxygen content in fuel or flare gas after combustion of the sample. A continuous gas sample is mixed with dry air at a precisely maintained constant ratio, which depends on the BTU range of the gas to be measured. The fuel air mixture is oxidized in a combustion furnace in the presence of a catalyst at 800°C, and the oxygen concentration of the combusted sample is measured by a zirconia oxide cell. The residual oxygen provides an accurate measurement for the Combustion Air Requirement of the sample gas, which can be correlated accurately to the Wobbe Index of the gas.
For a complete range of analytical instrumentation, applications, systems, and service options, we will work to match your needs and budget and provide the optimal, and most stable process analysis solution for your application.
SALES | TRAINING INQUIRIES
AMERICAS: info.americas@process-insights.com
EMEAI (includes India): info.emeai@process-insights.com
APAC: info.apac@process-insights.com
CHINA: info.cn@process-insights.com
Wobbe measurement vs CARI measurement
Wobbe Index and CARI (Combustion Air Requirement Index) are two different measurements used in the natural gas industry to determine the quality of natural gas.
The Wobbe Index is a measure of the interchangeability of fuel gases and is defined as the heating value of the gas per unit volume divided by the square root of the specific gravity of the gas. The Wobbe Index is used to ensure that the natural gas being supplied to a customer meets the required heating value. Natural gas appliances are designed to operate within a specific Wobbe Index range, and if the gas supplied to an appliance is outside that range, it can result in inefficient combustion, incomplete combustion, and potentially dangerous conditions.
On the other hand, CARI is a measure of the combustion air requirement of natural gas. It is a method used to determine the amount of air required to completely combust a given volume of natural gas. The CARI measurement is important because incomplete combustion of natural gas can lead to the formation of carbon monoxide, which is a poisonous gas.
While the Wobbe Index and CARI both measure different properties of natural gas, they are related. If the Wobbe Index of natural gas is too high or too low, it can affect the CARI measurement, which can result in incomplete combustion of the gas. Therefore, it is important to ensure that the natural gas being supplied meets both the Wobbe Index and CARI requirements.
Industries Served
The 9610 CXc supports:
- Oil & Gas
- Natural Gas Pipelines
- LNG Facilities
- Renewable Natural Gas
- Refineries
- Petrochemical Plants
- Chemical Manufacturing
- Hydrogen Production
- Power Generation
- Utilities
- Steel Manufacturing
- Industrial Boilers
