H2-CNI 4-20mA-I
High-precision, maintenance-free hydrogen detection
The H2-CNI 4-20mA-I offers a 4-20mA output signal and I2C connectivity for adjusting zero-point and gain of the sensor. Built on a catalytically active, siloxane-resistant element and operating on a non-isothermal calorimetric principle, this sensor delivers consistent performance from lab environments to real-world deployment.
Key Features & Benefits
Accurate measurement up to 10 vol-%
- Detects hydrogen in air with 100 ppm resolution
- Linear response curve up to 10 vol-% for simplified calibration and reliable readouts
Unmatched environmental robustness
- Resistant to valatile siloxanes and carbon monoxide - common catalyst poisons
- Operates in 0% to 100% relative humidity without baseline drift
- Temperature range -40°C to+80°C
Fast, reversible reaction times
- Enables rapid detection and clear recovery
- Ideal for critical applications where reaction time matters
Built-in stability & protection
- 4-20mA current-loop output with secure industrial interface
- Integrated temperature compensation
- Reverse polarity and over-voltage protection for dependable integration
- Can be operated standalone, without I2C connectivity
Engineered for longevity
- No regular maintenance required
- Designed for years stable, continuious operation
Key Features & Benefits
- Accurate measurement up to 10 vol-%
Detects hydrogen in air with 100 ppm resolution
Linear response curve up to 10 vol-% LEL for simplified calibration and reliable readouts
- Unmatched environmental robustness
Resistant to valatile siloxanes and carbon monoxide - common catalyst poisons
Operates in 0% to 100% relative humidity without baseline drift
Temperature range -40°C to +80°C
- Fast, reversible reaction times
Enables rapid detection and clear recovery
Ideal for critical applications where reaction time matters
- Built-in stability & protection
4-20mA current-loop output with secure industrial interface
Integrated temperature compensation
Reverse polarity and over-voltage protection for dependable integration
Can be operated standalone, without I2C connectivity
- Engineered for longevity
No regular maintenance required
Designed for years stable, continuious operation
Pin Configuration
Pin Configuration
Pin 1
+12V positive supply voltage with respect to ground
Pin 2
Current output connect to 0V of the current loop
Pin 3
Ground of the internal electronics. The pin is electrically not connected to the housing
Pin 4
Current input connect to +24V of the current loop*
SCL
Clock line of the I2C bus**
SDA
Clock line of the I2C bus**
* The current loop must be galvanically decoupled from the 12V supply voltage. No common mass is allowed. The current loop must contain a driving voltage source (recommended value: +24V).
** If connected, provide necessary pull-up resistors to SCL and SDA (e.g. 4.7kOhm).
Pin 1
+12V positive supply voltage with respect to ground
Pin 2
Current output connect to 0V of the current loop
Pin 3
Ground of the internal electronics. The pin is electrically not connected to the housing
Pin 4
Current input connect to +24V of the current loop*
SCL
Clock line of the I2C bus**
SDA
Clock line of the I2C bus**
* The current loop must be galvanically decoupled from the 12V supply voltage. No common mass is allowed. The current loop must contain a driving voltage source (recommended value: +24V).
** If connected, provide necessary pull-up resistors to SCL and SDA (e.g. 4.7kOhm).
Evaluation kit
for full accecibility for your sensor
Evaluation kit
For full accecibility for your sensor
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!
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!
Thanks for contacting us!
We will get back to you as soon as possible.
Oops, an error occurred while sending your message.
Please try again later.
