Ipsen HydroNit Sensor

HydroNit Sensor von Ipsen

As many of our customers already know, our HydroNit® Sensor allows for extremely accurate and reproducible detection of hydrogen partial pressure, particularly in nitriding and nitrocarburizing atmospheres. This allows the processes to be controlled extremely accurately and efficiently in regard to gas consumption.

The main features of the most recent generation of Ipsen HydroNit® Sensors are consistent further development in terms of its service life when used in nitrocarburizing processes, as well as a visually appealing design. All units required for operation are now combined in a compact housing, which also allows for retrofitting of the sensor on existing installations.


  • Extremely fast response behavior
  • Direct measurement of the furnace's atmosphere
  • No cross-sensitivity
  • Presence of oxygen not necessary
  • Compact and visually appealing design
  • Modern and high-quality vacuum and process gas pumps
  • Avoidance of process gas residue thanks to extremely short and well-insulated gas pipes in the unit
  • As short as possible, heated gas ducting back to the furnace
  • Can be used as a transducer or as a control element
  • Can be retrofitted easily in existing installations, thanks to the compact and self-sufficient design

A few years ago, development of the Ipsen HydroNit® Sensor made it possible to measure the hydrogen partial pressure in the corresponding atmospheres for open-loop and closed-loop control of nitriding and nitrocarburizing processes. Since then, there has been the option of reproducible detection and closed-loop control of heat treatment atmospheres whose properties can be determined by the hydrogen content. In particular, these are nitriding and nitrocarburizing processes, but safety monitoring of the hydrogen content in an atmosphere is also conceivable.

The worldwide patent-pending sensor is located directly in the furnace and measures the hydrogen partial pressure, which is produced by ammonia dissociation at the current furnace temperature. The hydrogen partial pressure measurement is able to occur directly in the furnace without  any cross-sensitivity from any of the other nitriding and nitrocarburizing gassing components in the furnace. In addition, it is also extremely precise and possesses quick response times for measuring concentration changes in the furnace due to the sensor's special design.

As compared with conventional hydrogen analyzers positioned outside the furnaces, the Ipsen HydroNit® Sensor offers considerable advantages. Not only is its response time considerably shorter than that of the aforementioned hydrogen analyzers, but it also offers far higher accuracy and reproducibility.

Measuring errors, such as those that may occur with external analyzers as the result of pipe leaks, are eliminated with the Ipsen HydroNit® Sensor. The problem of condensation in the feed pipe, as exists with hydrogen analyzers, has been solved with the HydroNit® Sensors. Furthermore, as compared with sensors based on solid electrolytes conducting oxygen ions, the HydroNit® Sensor also affords substantial advantages since it is not at all reliant on the presence of oxygen in the nitriding gas.