Hydrogen Sensors


Two sensor families. One mission: reliable hydrogen detection


At FES Sensor Technology, we offer two families of hydrogen gas sensor tailored for different environments and detection needs- both built on proven principles and decades of research. Wether you're working with hydrogen in air or inert gases our sensor solutions offer the precision, durability and integration flexibility your application demands.

Hydrogen Sensors


Two sensor families. One mission: reliable hydrogen detection


At FES Sensor Technology, we offer two families of hydrogen gas sensor tailored for different environments and detection needs - both built on proven principles and decades of research. Wether you are working with hydrogen in air or inert gases our sensor solutions offer the precision, durability and integration flexibility your application demands.

Sensor Families

Sensor family

Gas environment

Detection range

Output options

Sensor

family

Gas environment

Detection range

Output options


Calorimetric (CNI Series)

Hydrogen in air or oxygen

0-10 vol-% H2

Analog (0-10V, 4-20mA) or digital (I2C)

Calorimetric (CNI Series)

Hydrogen in air or oxygen

0-10 vol-% H2

Analog

(0-10V, 4-20mA)

Digital

(I2C)

Thermal Conductivity (meTCD Series)

Hydrogen in inert gases

0-100 vol-% H2

Analog (0-10V, 4-20mA) or digital (I2C)

Thermal Conductivity (meTCD Series)

Hydrogen in inert gases

0-100 vol-% H2

Analog

(0-10V, 4-20mA)

Digital

(I2C)

Calorimetric Sensors (CNI Series)


High-sensitivity detection in air and oxygen


Designed for detection hydrogen concentrations below the lower explosion limit (LEL) in air or oxygen-containing environments, our CNI series sensors use a catalytic, non-isothermal calorimetric principle to deliver accurate, long-term stable readings.


How it works


Hydrogen is oxidized on a catalytic layer thereby generating heat. The sensor measures the resulting temperature increase relative to a reference element using a wheatstone-bridge configuration. This differential signal correlates with hydrogen concentration.


Key benefits


  • Accurate detection from 0-10 vol-% hydrogen
  • Linear calibration for stable, long-term performance
  • Fast and reversible response
  • High resistance to humidity and valatile siloxanes
  • Available with analog (0-10V, 4-20mA) or digital output (I2C)
  • Integrated compensation for ambient temperature variations

Caloriemtric Sensors (CNI Series)


High-sensitivity detection in air and oxygen


Designed for detection hydrogen concentrations below the lower explosion limit (LEL) in air or oxygen-containing environments, our CNI series sensors use a catalytic, non-isothermal calorimetric principle to deliver accurate, long-term stable readings.


How it works


Hydrogen is oxidized on a catalytic layer, generating heat. The sensor measures the resulting temperature increase relative to a reference element using a Wheatstone-Bridge configuration. This differential signal correlates with hydrogen concentration.


Key benefits


  • Accurate detection from 0-10 vol-% hydrogen
  • Linear calibration for stable, long-term performance
  • Fast and reversible response
  • High resistance to humidity and valatile siloxanes
  • Available with analog or digital output (I2C, 0-10V, 4-20mA)
  • Integrated compensation for ambient temperature variations

Thermal Conductivity Sensors (meTCD Series)


Hydrogen detection in inert gas atmospheres



Our thermal conductivity sensors are engineered for hydrogen measurement in inert environments (e.g., nitrogen, argon). They detect changes in the overall heat conductivity of the sorrounding gas, where the presence of hydrogen significantly alters thermal transfer.


How it works


Each gas mixture has a characteristic thermal conductivity. Hydrogen, having a very high thermal conductivity, alters the sensor signal when present, enabling accurate measurement up to 100 vol-%.


Key benefits


  • Measurement range 0-100 vol-% hydrogen
  • Optimized for use in inert gas matrices
  • Non-reactive principle ideal for process monitoring and leak detection
  • Robust perfomance for industrial applications
  • Available with analog (0-10V, 4-20mA) or digital output (I2C)

Thermal Conductivity Sensors (meTCD Series)


Hydrogen detection in inert gas atmospheres


Our thermal conductivity sensors are engineered for hydrogen measurement in inert environments (e.g., nitrogen, argon). They detect changes in the overall heat conductivity of the sorrounding gas, where the presence of hydrogen significantly alters thermal transfer.


How it works


Each gas mixture has a characteristic thermal conductivity. Hydrogen, having a very high thermal conductivity, alters the sensor signal when present, enabling accurate measurement up to 100 vol-%.


Key benefits


  • Measurement range 0-100 vol-% hydrogen
  • Optimized for use in inert gas matrices
  • Non-reactive principle ideal for process monitoring and leak detection
  • Robust perfomance for industrial applications
  • Available with analog (0-10V, 4-20mA) or digital output (I2C)

Sensor Overview

Sensor

Temperature range

Detection range

Interface

Sensor

Temperature range

Detection range

Interface

H2-CNI

4-20mA-I

Details

-40°C to +80°C

up to 10 vol-% with 100ppm resolution in air

4-20mA

H2-CNI 4-20mA-I

-40°C to +80°C

up to 10 vol-% with 100ppm resolution in air

4-20mA

H2-CNI

0-10V-I

Details

-40°C to +80°C

up to 10 vol-% with 100ppm resolution in air

0-10V

H2-CNI I2C-E ULTD

Details

-40°C to +120°C

up to 12 vol-% with 0.25%

resolution in air

I2C Bus

H2-CNI

I2C FWB-A

Details

-40°C to +85°C

up to 12% vol-% with 100ppm resolution in air

I2C Bus

H2-meTCD 4-20mA

Details

-20°C to +85°C

up to 100% vol-% in air and nitrogen

4-20mA

H2-meTCD 0-10V

Details

-20°C to +85°C

up to 100% vol-% in air and nitrogen

0-10V

H2-meTCD I2C

Details

-20°C to +85°C

up to 100% vol-% in air and nitrogen

I2C Bus

H2-TCD I2C-I

Details

-20°C to +85°C

up to 100% vol-% in air and nitrogen

I2C Bus

H2-CNI 0-10V-I

-40°C to +80°C

up to 10 vol-% with 100ppm resolution in air

0-10V

H2-CNI I2C-E ULTD

-40°C to +120°C

up to 12 vol-% with 0.25% resolution in air

I2C Bus

H2-CNI I2C FWB-A

-40°C to +85°C

up to 12 vol-% with 100 ppm resolution in air

I2C Bus

H2-meTCD 4-20mA

-20°C to +85°C

up to 100 vol-% in air and nitrogen

4-20mA

H2-meTCD 0-10V

-20°C to +85°C

up to 100 vol-% in air and nitrogen

0-10V

H2-meTCD I2C

-20°C to +85°C

up to 100 vol-% in air and nitrogen

I2C Bus

H2-TCD I2C-I

-20°C to +85°C

up to 100 vol-% in air and nitrogen

I2C Bus

Need a custom solution?


We offer customization options on existing sensors as well as custom

development of completely new sensors or features.


Tell us about your needs and we'll get back to you!