9800CXi Calorimeter

Injection-Style Measurement Calorimeter

Zero Hydrocarbon Emissions

Our NEW COSA XENTAUR™ 9800CXi™ Calorimeter is a fast response, injection-style zero-hydrocarbon emissions calorimeter.  It can provide direct measurement of Calorific Heating Value and BTU with a measurement range 0-3000 BTU/scfh.  A real advantage with the 9800CXi calorimeter is that it can handle high sulfur concentrations with an H2 measurement option.

An injection-style zero-hydrocarbon emissions calorimeter is a specialized instrument used for measuring the calorific value of fuels and other combustible materials without emitting any hydrocarbons into the environment. It works by injecting a small sample of the material into a combustion chamber where it is burned, and measuring the heat produced by the combustion reaction.

Unlike traditional calorimeters that require the use of a constant flow of hydrocarbon fuel for ignition and operation, an injection-style zero-hydrocarbon emissions calorimeter uses an alternative ignition system that doesn’t produce hydrocarbon emissions. This allows for a more environmentally friendly testing process and eliminates the need for additional hydrocarbon fuels to operate the calorimeter.

  • Industrial PLC System, touchscreen HMI
  • High temperature combustion
  • Flameless / no flameouts
  • Built for indoor, outdoor, dirty, and corrosive environments
  • Precise measurement of air fuel ratio
  • Global service and repairs
  • Compact, sturdy O2 Cell is designed to be cost-effective, and for ease of maintenance and service
  • Internal sample system up to 50°C with options to 100°C or 150°C
  • Full measurement range 0-3000 BTU/SCFH without the need of a specific gravity meter


The 9800CXi calorimeter 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.  The residual oxygen provides an accurate measurement for the Combustion Air Requirement (CARI) of the sample gas, which can be correlated accurately to the Wobbe Index of the gas.

Key advantages to using our measuring principle, based on the Residual Oxygen Measurement Method, are its insensitivity to changes in ambient temperature, very fast response times with the ability to measure BTU values down to zero.  A small constant volume of sample gas is injected into a continuous flow of combustion air with each measurement cycle, providing a precisely maintained fuel/air ratio profile. The fuel air mixture is oxidized in the combustion furnace at 1000°C, and the residual oxygen concentration of the combustion sample is measured by a zirconia oxide sensor. The residual oxygen provides an accurate method of measuring Heating Value with optional measurement of Wobbe Index correlated to Specific Gravity of the sample gas. Higher temperature reduces maintenance of the instrument; varying temperature up to 1000°C.

The 9800 CXi Calorimeter is a highly sensitive instrument used for measuring the calorific value of liquid and gaseous fuels. It is commonly used in industries where accurate measurement of the calorific value of fuels is critical. Some of the industries that use the 9800 BTU Calorimeter include:

  • Oil and Gas:  Commonly used in the oil and gas industry for measuring the heating value of natural gas, propane, butane, and other fuels.
  • Petrochemical: Petrochemical companies use the 9800 BTU Calorimeter for measuring the calorific value of different feedstocks such as crude oil, coal, and biomass.
  • Power Generation: Used in the power generation industry to measure the heating value of coal, oil, and other fuels used in boilers and turbines.
  • Research and Development: The high sensitivity of the 9800 BTU Calorimeter makes it suitable for use in research and development laboratories for studying the properties of fuels and developing new fuel blends.
  • Environmental: Used in the environmental industry for measuring the heating value of waste materials for combustion and energy recovery.

Benefits of the 9800CXi include:

  • High Accuracy: Provides highly accurate results for measuring the calorific value of fuels, with a precision of +/-0.2%.
  • Fast Response Time: Has a fast response time, providing results within seconds, making it suitable for real-time monitoring and control of fuel quality.
  • Low Sample Volume: Requires a small sample volume, which reduces the amount of fuel required for testing and minimizes waste.
  • Wide Measurement Range: Ras a wide measurement range, which makes it suitable for measuring the heating value of various liquid and gaseous fuels.
  • Easy to Operate: Is 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.
  • Measures low BTU Gases
  • Low maintenance
  • Flameless / no flameouts
  • Measures Wobbe and CARI
  • EPA 40CFR63.670(j) Compliant
  • Direct Measurement Method (ASTM D-4891 Compliant)
  • Gross or net heating values
  • Small footprint
  • Rack or stand options available
NEW - 9800 CXi Calorimeter v23

flare gas flyer


Americas +1 713.947.9591
EMEA +49 69 20436910
China/APAC +86 400 086 0106





COSA XENTAUR™ Continuous Direct BTU, Wobbe Index, Heating Value, CARI Calorimeter
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