Hydrogen Production


Fuel Cell Applications


Hydrogen in Natural Gas


Process Analysis


Customized Solutions

The compact and robust TCD3000 SI (Screw-In) transmitter is ideally suited for precise, fast, and sensitive measurement of (quasi-)binary gas mixtures. The measurement is based on the principle of thermal conductivity. This technology is ideal for measuring gases with significantly different thermal conductivities, such as H2 and O2.

    Our Advantages:

  • Revolutionary precision in hydrogen concentration measurement: Discover our gas measuring devices with industry-leading response time of 30 ms and a measurement range from a few ppm to 100 vol%, specially developed for the new requirements of the hydrogen infrastructure in the energy sector and process industry.
  • Unrivalled robustness for demanding environments: Our devices resist condensate and water without damage, provide precise measurements up to a pressure of 700 bar, and are optimized for use in humid environments – ideal for electrolysers, fuel cells, and other hydrogen applications.
  • Maximum safety, minimal maintenance: Increase your work safety with our fast and reliable explosion level monitoring. Our devices are a long-term investment with a lifespan of up to 10 years.
  • Adaptability meets economy: Save costs and space with our versatile gas measuring devices that can measure a wide variety of gas mixtures without additional sample preparation. A cost-efficient solution that surpasses the competition in terms of price and performance.

Dimensions with connectors; Weight H=80 mm, D=40 mm; G1/2″; SW36; ~250g
Power Supply 12 – 36 VDC, 12 W
Digital Output RS485, Baud rate 38400 / Data 8bit
Analog Output 4-20 mA, 3-wire connection
Ambient temperature range -20°C … 80°C
Warm-up Time < 1 Min.
Flow Rate 0 … 10m/s
Gas pressure (absolute) 0,8 … 200 Bara / 700 Bara on request
T90-Time < 1s
Noise < 50 ppm
Drift at zero point < 100 ppm per week
Repeatability < 50 ppm
Error due to change of ambient temperature < 50 ppm per 10°C
Flow Influence < 50 ppm per 10 l/h
Pressure Dependency (above 800 hPa) < 50 ppm per 10hPa
All data refer to the measuring range 0.5 vol.% H2 in N2

The measurement of hydrogen concentration using thermal conductivity offers several advantages

  • Firstly, it enables a fast and accurate determination of hydrogen content in a medium. By utilizing thermal conductivity, precise measurements can be obtained without the need for complex and time-consuming sampling or chemical analyses.
  • Secondly, it enables a fast response time of just 30 ms, allowing for nearly real-time monitoring. This enables quick detection of changes in hydrogen concentration and early identification of potential safety risks.
  • Thirdly, thermal conductivity measurement is a cost-effective solution. The required sensors and devices are typically affordable and easy to operate. Additionally, the method does not require expensive consumables or extensive maintenance.
  • Fourthly, thermal conductivity measurement provides a wide dynamic measurement range. It can detect hydrogen concentrations ranging from a few parts per million (ppm) to 100% volume percent (Vol%). This versatility allows for its application in a variety of scenarios, from monitoring hydrogen leaks in industrial facilities to accurately determining hydrogen concentration in fuel cells.
  • Finally, measuring hydrogen concentration through thermal conductivity allows for continuous monitoring. By employing automated systems, continuous measurements can be performed to capture real-time changes and detect potential safety risks early on.
  • Overall, the measurement of hydrogen concentration using thermal conductivity provides an efficient, accurate, non-contact, and cost-effective method for monitoring hydrogen in various applications, including industry, energy systems, and environmental protection.


Measuring Gas Carrier Gas Basis Range Smallest Range
Hydrogen (H2) Oxygen (O2) or Air 0%-100% 0% – 0,5%
Oxygen (O2) Hydrogen (H2) 0% – 100% 0% – 1,0%
Hydrogen (H2) Nitrogen (N2) or Air 0% – 100% 0% – 0,5%
Nitrogen (N2) Hydrogen (H2) 0% – 100% 0% – 2,0%
Hydrogen (H2) Argon (Ar) 0% – 100% 0% – 0,5%
Hydrogen (H2) Helium (He) 0% – 100% 20% – 100%
Hydrogen (H2) Methane (CH4) 20% – 100%     –     
Hydrogen (H2) Carbon dioxide (CO2) 0% – 100% 0% – 0,5%
Helium (He) Nitrogen (N2) or air 0% – 100% 0% – 0,8%
Helium (He) Argon (Ar) 0% – 100% 0% – 0,5%
Measuring Gas Carrier Gas Basis Range Smallest Range
Methane (CH4) Nitrogen (N2) or air 0% – 100% 0% – 2,0%
Methane (CH4) Argon (Ar) 0% – 100% 0% – 1,5%
Oxygen (O2) Nitrogen (N2) 0% – 100% 0% – 15,0%
Oxygen (O2) Argon (Ar) 0% – 100% 0% – 2,0%
Oxygen (O2) Carbon dioxide (CO2) 0% – 100% 0% – 3,0%
Nitrogen (N2) Argon (Ar) 0% – 100% 0% – 3,0%
Carbon dioxide (CO2) Nitrogen (N2) 0% – 100% 0% – 3,0%
Carbon dioxide (CO2) Argon (Ar) 0% – 60% 0% – 10,0%
Argon (Ar) Carbon dioxide (CO2) 40% – 100%     –    
Argon (Ar) Oxygen (O2) 0% – 100% 0% – 3,0%


oil & gas, petrochemicals, chemicals and synthetics

gas chromatographs

air separators and pure gas production

detection of gas leakages


food industry

metals, minerals, pulp and paper

power generation

environmental technology
Hydrogen measurement in electrolysis
O2 in H2
Upper Explosion Limit (UEL)
Oxygen measurement in electrolysis
H2in O2
Lower Explosion Limit (LEL), with high moisture content
H2 contamination in electrolysis, fuel cells, and semiconductor industry
99-100 vol.%, H2 Quality 4.0
Exhaust gas measurement in fuel cells
H2 in Air
LEL monitoring with very high water content
H2 injection into the natural gas network
H2 in Natural Gas
0-100 vol.%, mixing control
Decomposition and synthesis of ammonia
H2 in N2 + NH3
0-100 vol.%, process control
Turbogenerators in power generation
H2 in Luft,
H2 in CO2 (Ar), CO2 (Ar) in Air
Monitoring of UEL, draining and filling process
Pure gas production and incoming goods inspection
H2, He, CH4, O2, N2, CO2, Ar
Identification of the quality of produced and delivered gases
Industrial applications blanketing for hardness
H2 in N2
0-10 vol.%, systems for the production and monitoring of forming gas
Safety monitoring
H2 in Air
UEL, analysis of hydrogen dispersion in facilities and buildings