Union Instruments
CWD Calorimeter Series – Continuous Gas Quality and Calorific Value Measurement
Direct measurement of Wobbe Index, density, and heating value for industrial gas control
Gas quality defines performance, safety, and efficiency — especially in power generation, process combustion, and biogas upgrading.
The CWD Series from Union Instruments provides real-time, direct calorimetry for determining gas parameters such as Wobbe Index, specific density, and heating or combustion value.
CWD analyzers are trusted wherever operators require accurate, fast, and reliable insight into changing gas compositions — from biogas and syngas to natural gas and refinery applications.
Want to know more about our solutions from Union Instruments?
Peter Wolsing
+45 26 30 63 34
Technology and Function
The CWD (Calorimetry, Wobbe-Index, Density) series determines gas quality parameters by directly measuring:
- Wobbe Index (WI)
- Specific Density
- Heating and Combustion Values
From these measured parameters, the analyzer calculates the combustion air requirement (CARI) and energy quantity. When combined with additional gas analysis components, the CWD can also determine the full air requirement factor from gas composition.
The measurement principle detects all combustible gas components, allowing the system to respond immediately to changing gas streams — an essential advantage for modern energy and process industries.
Your Benefits
- Continuous, direct measurement of all relevant gas quality parameters
- Accurate and stable operation even with fluctuating gas compositions
- Fast response time for combustion control and process adjustment
- Low maintenance and high operational availability
- ATEX-certified models for safe operation in hazardous zones
- Data integration with energy metering systems (EMS2005)
Typical Applications
- Power generation and CHP systems
- Biogas and syngas plants
- Refinery and petrochemical industry
- Industrial furnaces and steelworks
- Energy billing and gas grid management
Why It Matters
Precise calorimetry ensures that fuel gases are used efficiently, safely, and economically.
With the CWD Series, you get accurate, real-time data on gas energy content and combustion behavior — critical for:
- Optimizing burner control
- Improving energy efficiency
- Ensuring billing accuracy
- Complying with environmental and safety standards
These products are used within these applications
Power and Energy
In today’s rapidly evolving energy landscape, Combined Heat and Power (CHP) plants play a pivotal role in achieving sustainable, efficient power generation.
Biogas
Gas analysis plays a crucial role in improving the efficiency of a biogas plant by providing real-time insights into the composition and flow of biogas.