Survey: New and Discontinued Products 

H2-CNI 0-10V-I is now equipped with an I2C bus with sockets for the SCL and SDA lines on the backside of the sensor that can be optionally connected to enablbe adjustment of the sensor. It is pin-compatible with previous models H2-CNI 0V-I, H2-CNI 0V-I ULTD, and H2-CNI 0V-I WR. Similar to H2-CNI 0V-I ULTD, sensing and reference element are tuned exactly to each other. The sensor is equipped with a voltage output of 0-10V like the previous model H2-CNI 0V-I WR. New is the digital adjustability of zero point and measuring range. The excitation voltage of the internal Wheatstone bridge, by which the sensing and reference elements are heated at a moderate temperature, can be modified to a small extent. This enables the applicability of the sensor in gaseous atmospheres that have a larger oxygen level than air.


H2-CNI 4-20mA-I is now equipped with an I2C bus with sockets for the SCL and SDA lines on the backside of the sensor that can be optionally connected to enablbe adjustment of the sensor. It is pin-compatible with previous models H2-CNI 4-20mA-I und H2-CNI 4-20mA-I ULTD. Similar to H2-CNI 4-20mA-I ULTD, sensing and reference element are tuned exactly to each other. New is the digital adjustability of zero point and measuring range. The excitation voltage of the internal Wheatstone bridge, by which the sensing and reference elements are heated at a moderate temperature, can be modified to a small extent. This enables the applicability of the sensor in gaseous atmospheres that have a larger oxygen level than air.


H2-CNI I2C-I FWB-A has been equipped with a new technique for zero-point adjustment by a digital-analog converter with 12 bit resolution. The zero-point can hence be adjusted in 4096 steps which is by a factor of four higher than the 1024 steps of the previous H2-CNI I2C-I FWB-A with a rheostat. In addition, the converter operates in a linear fashion.


The previous models H2-CNI 0V-I, H2-CNI 0V-I ULTD, H2-CNI 0V-I WR, H2-CNI 4-20mA-I, and H2-CNI 4-20mA-I ULTD with precision trimmer for mechanical adjusting the zero-point and the gain are still available and can be produced.


The previous models H2-CNI 0V and H2-CNI 1V are obsolet.

H2-meTCD 4-20mA


• Accurate detection of hydrogen levels in air and nitrogen up to 15 vol-%

• Temperature range -20 °C to +85 °C

• Linear output up to 5 vol-%

• 4-20 mA current-loop transmitter with reverse voltage operation and over-voltage surge protection

H2-meTCD 0-10V


• Accurate detection of hydrogen levels in air and nitrogen up to 100 vol-%

• Temperature range -20 °C to +85 °C

• Linear output up in a 5 vol-% range

• 0-10V output signal 

H2-meTCD I2C


  • Accurate detection of hydrogen levels in air and nitrogen up to 100 vol-%
  • Temperature range -20 °C to +85 °C
  • Programmable gain amplification (PGA), 16-bit analog-to-digital converter, on board digital temperature sensor, and 1K EEPROM

H2-TCD I2C-I


  • Detection of hydrogen levels in nitrogen up to 100 vol-%
  • Industrial temperature range -40 °C to +85 °C
  • Linear output 

H2-CNI 4-20mA-I


  • Accurate detection of hydrogen levels up to 100% LEL with 100 ppm resolution in air
  • Industrial temperature range -40 °C to +80 °C
  • Linear output up to 100 % LEL
  • 4-20 mA current-loop transmitter with reverse voltage operation and over-voltage surge protection 

H2-CNI 0-10V-I


  • Accurate detection of hydrogen levels up to 100% LEL with 100 ppm resolution in air
  • Industrial temperature range from -40 to +80 °C
  • Linear output up to 100 % LEL
  • 0-10 V signal output

H2-CNI I2C-E ULTD


  • Detection of hydrogen levels up to 100% LEL with 0.25 % resolution in air
  • Extended temperature range from -40 °C to +120 °C
  • Linear output up to 100 % LEL
  • On-board digital temperature sensor and EEPROM with I2C®bus connectivity 

H2-CNI I2C FWB-A


  • Detection of hydrogen levels up to 12 vol % with 100 ppm resolution in air
  • Industrial temperature range from -40 °C to +85 °C
  • Linear output
  • Full Wheatstone bridge (FWB) configuration, including a digital rheostat with a nonvolatile memory for offset adjustment 

H2 Measuring devices


  • For our sensors H2-CNI 0-10V-I and H2-meTCD 0-10V or H2-CNI 4-20mA-I and H2-meTCD 4-20mA
  • 2,4" TFT color display to monitor the measuring data
  • Data logger to register the measuring data
  • Connector to control a three-colored 24V-LED warning light

PGA-ADC 3.4 für H2-CNI 0-10V-I und H2-meTCD 0-10V


The controller PGA-ADC 3.4 serves as evaluation kit for calorimetric, non-isothermally operated H2-CNI 0-10V and and thermal conductivity H2-meTCD 0-10V. It contains a precision, zero-drift programmable gain instrumentation amplifier and a 16-bit DS analog-to-digital converter with input current cancellation and a bandgap reference with very high accuracy and low thermal drift of 10 ppm/°C (max). A 1K bit EEPROM for storing adjustments and three switchable LEDs (blue, orange, red) as optical signals for different H2 levels are implemented.

The evaluation kit is operated through a 1-wire bus connector with a personal computer, an installed LabVIEW® runtime and the SensorControl software.


DCC-PGA-ADC 3.4 für H2-CNI 4-20mA-I und H2-meTCD 4-20mA


The controller DCC-PGA-ADC 3.4 serves as evaluation kit for calorimetric, non-isothermally operated H2-CNI 4-20mA and thermal conductivity H2-meTCD 4-20mA sensors. It contains a dc-dc converter to galvanically separate the current loop from the 12 V supply voltage. It contains a precision, zero-drift programmable gain instrumentation amplifier  and a 16-bit DS analog-to-digital converter with input current cancellation and a bandgap reference with very high accuracy and low thermal drift of 10 ppm/°C (max). A 1K bit EEPROM for storing adjustments and three switchable LEDs (blue, orange, red) as optical signals for different H2 levels are implemented.

The evaluation kit is operated through a 1-wire bus connector with a personal computer, an installed LabVIEW® runtime and the SensorControl software.

TempSens 3.1


The controller  TempSens 3.1 serves as evaluation kit for our sensors H2-CN I2C-I FWB-A. TempSens 3.1 provides the SDA and SCL lines for the internal I2C bus of the sensor. The controller has a ±1.0°C accurate digital temperature sensor with 12 bit resolution to measure the ambient temperatur and a 1K bit EEPROM.

The evaluation kit is operated through a 1-wire bus connector with a personal computer, an installed LabVIEW® runtime and the SensorControl software.


PrecVS-PGA-ADC 3.6


The controller PrecVS-PGA-ADC 3.6 serves as evaluation kit for our sensors H2-CN I2C-E ULTD. The controller contains an adjustable (256 steps) 300-mA LDO voltage regulator and the second branch of a Wheatstone bridge to power up the sensor. It delivers an excitation voltage up to 12 V. The bridge is zeroed with a 64-position digital rheostat which is a component of the second branch of the Wheatstone bridge. The balance voltage of the bridge is measured with a precision, zero-drift programmable gain instrumentation amplifier and a 16-bit analog-to-digital converter with input current cancellation and a bandgap reference with very high accuracy and low thermal drift of 10 ppm/°C (max). The controller contains a ±1.0°C accurate digital temperature sensor with 12-bit resolution for ambient temperature measurement and a 1K bit electrically erasable PROM. PrecVS-PGA-ADC 3.6 also provides SDA and SCL junctions to the internal I2C bus of the H2-CNI I2C-E ULTD sensor to access the sensor´s EEPROM and housing temperature sensor.

The evaluation kit is operated through a 1-wire bus connector with a personal computer, an installed LabVIEW® runtime and the SensorControl software.


I2C-USB 2.1


The controller I2C-USB 2.1 serves as evaluation kit for our sensors H2-CNI I2C-I FWB-A for direct connection to an USB interface of a PC without additional components. It provides the SDA and SCL lines for the internal I2C bus of the sensor. The operation voltage of 9V for the sensor is generated in the kit from the 5V USB voltage by means of a step-up converter. The controller contains a ±1.0°C accurate digital temperature sensor with 12-bit resolution to determine the ambient temperature as well as a 1K bit EEPROM.

For operation, the evaluation kit is connected with the USB port of a Windows®-PC, on which a LabVIEW® runtime and our SensorControl software run. 


I2C-USB 1.1


Module to adjust zero point and measuring range of all analog sensors with additional I2C bus connector.

Test chamber


TC 2x1/4” is a 3D printed test chamber with small internal volume and low flow rates. In combination with evaluation kits, TC 2x1/4” enables the characterisation of gas sensors (20 mm diameter, 16 mm height) at defined air composition under flow conditions.

Socket with M8 circular connector

Socket for analog sensors with 0-10V output and three pins or 4-20mA  current transmitter and four pins.