WIM COMPAS™  – Fuel gas & flare gas combustion measuring

The WIM COMPAS™ adds to Hobré’s portfolio of process analyzers for (Fuel and flare gas combustion measuring) measuring the Wobbe Index, heating value (BTU) and the Combustion Air Requirement Index (CARI). Designed and manufactured in-house, the WIM COMPAS™  builds on hobré’s 20+ years of success and experience with residual oxygen type analyzers. The WIM Compas™  is used to control the thermal input and air:fuel ratio in such a way that disturbances caused by fuel gas quality fluctuations are minimized, the combustion process occurs with maximum efficiency and emissions are reduced to a minimum.

Key Benefits

  • Can be installed outdoors
  • Easy to operate
  • Unmatched response time
  • Suitable for installation in hazardous area
  • Safe flameless design
  • Handles high dewpoint
  • Measures flare gases and high S gases
  • Zero-emission option



This version is designed for top performance where response time, repeatability and reliability count. A small sample flow is mixed continuously with air. The air-fuel mixture undergoes catalytic combustion followed by measurement of the residual oxygen. This provides a direct measure of CARI and correlates to the Wobbe Index as per ASTM 4891-89. By integrating a specific gravity cell, heating value and air demand are also measurable.

WIM COMPAS Zero Emission version

Infographic 1. Continuous configuration

Cyclic injection

WIM COMPAS Injection version

Infographic 2. Injection configuration

The WIM COMPAS™ offers an unmatched, robust solution with high availability, for Fuel and flare gas combustion measuring, such as sour gas and flare gas. Hobré has developed an analyzer especially for these kinds of applications, that injects small amounts of gas into an air stream, typically at intervals of 30 seconds. The oxygen peak size is a direct measure of the air demand and proportional to the heating value (BTU).



WIM COMPAS High Temp analyzer

Keeping the gas above dewpoint is crucial to the success of most applications. The WIM Compas™ F can be heated up to 55°C (131°F) as standard; high-temperature versions (up to 150°C / 300°F) are available if required

TechnologyResidual Oxygen methodResidual Oxygen methodResidual Oxygen methodResidual Oxygen method
PrincipleContinuous typeContinuous typeInjection typeInjection HT
Typical ResponseT90 <5 secondsT90 <5 secondsUpdate time 30 secondsUpdate time 30 seconds
Gas / ApplicationNatural Gas, LNG – Blending, Turbine (Power)Fuel gas – Blending, Turbine (Power), Burner/Furnace/Heater/BoilerBlast Furnace Gas, Coke Oven Gas, Flare gas, Sour gas –
Steel applications, Flaring
Flare gas, Sour gas (high dew point up to 150°C/300°F) – Flaring

Curious to find out more about the WIM COMPAS and what is possible for you? Please fill in this contact form and we will contact you as soon as possible.