Calorimeter
CWD EXP
The CWD EXP is a high-performance combustion calorimeter specifically designed for the direct and continuous determination of gas quality in potentially explosive atmospheres. As part of the CWD series – Calorimetry, Wobbe Index and Specific Gravity – it provides reliable measurement of key gas quality parameters, including calorific and heating value, Wobbe index, specific density, and CARI (air requirement).
Engineered for use in hazardous industrial environments, the CWD EXP combines continuous gas quality measurement with an explosion-proof design, enabling reliable operation in applications where combustible gases and potentially explosive atmospheres are present.
Typical areas of application include flare gas combustion, gas turbine control, and fuel control in refineries and petrochemical plants. Its robust design and continuous measurement capability make the CWD EXP particularly suitable for demanding processes where precise gas quality monitoring, operational reliability, and process control are essential.
| Parameter | Value |
|---|---|
| Weight | 140 kg |
| Dimensions (H × W × D) | 1240 × 935 × 335 mm |
| Protection Rating | IP65 during operation |
| Ex Classification | ATEX: II 2G Ex pxb IIC T4 Gb, IECEx: Ex pxb IIC T4 Gb |
| Ambient Temperature | −10 °C to +50 °C |
| Ambient Humidity | 0–95% RH, non-condensing |
| Gas Inlet Pressure | 20–500 mbar |
| Process Gas Inlet | 1, additional optional |
| Test Gas Inlet | 1 per measuring range |
| Carrier Gas Inlet | Max. 1 |
| Relative Gas Humidity | 0–95%, non-condensing |
| Instrument Air Consumption | 25–30 m³/h (standard consumption) |
| Instrument Air Pressure | 3.5–10 bar |
| Supply Voltage | 115/230 VAC, 50/60 Hz |
| Interfaces | 4× Analog (additional optional), 6× SPDT (additional optional), optional bus systems |
| T90 Response Time | < 10 s |
The CWD product series in comparison
CWD BASIC
Reliable measurement of calorific
and heating value as well as Wobbe index
CWD PLUS
Continuous, highly accurate determination of the Wobbe index
CWD DPC
for use in accordance with Class I Division 2, Groups B, C, D, T4
CWD SPC
Reliable, reproducible measured values in real time for optimum monitoring
CWD EXP
Safe shutdown with changing gas composition Gas composition
CWD HT
The new CWD for precise measured values in the high temperature range
Industry applications
These products can be used in the following sectors.
Iron and steel production
Our appliance series have been used in iron and steel production for many decades.
Biogas
Union Instruments products have proven themselves extensively in biogas upgrading plants.
Petrochemicals and refineries
We produce customized and flexible measurement technology solutions for the petrochemical industry and refineries.
Glass and ceramics
Perfectly coordinated appliance technology for glass and ceramic applications that works both safely and economically.
Natural gas
Our INCA multi-gas analyzers provide efficient solutions for processes in natural gas plants.
Generating energy from waste
Our appliance technology makes an important contribution to the functionality of environmentally friendly and energy-saving system concepts.
Service
We clarify administrative and commercial issues for you.
+49 721 680381-30
Support
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Distribution
We prepare quotations for you, clarify questions about invoicing and manage your maintenance contract.
+49 721 680381-20
Downloads
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Brochures, data sheets and application reports – we have all the relevant information for you here.
Industries
Our key application areas at a glance.
We supply a wide range of industrial plants such as steel production, the natural gas industry and biogas producers.
Products
Special products for your industrial application.
Our range includes the INCA, CWD and SIRA product series and the CAM module – combined with top advice and service.