DH603Residual and Diffusible Hydrogen Determination by Hot Extraction

Your hydrogen determinations in ferrous alloys are delivered quickly and precisely with our DH603 which uses residual, diffusible, and total hydrogen measurements. A small footprint, user-friendly operating software, increased instrument safety, and reliability are all part of the advanced DH603 design to truly streamline your hydrogen determination.


  • Exclusive ECLIPSE architecture—a unique design by LECO that improves reliability and serviceability
  • A variety of evacuated pin tubes and diffusible samplers for quick and easy hydrogen determination of molten metals
  • Improved plumbing offers faster maintenance of flow path
  • Easily accessible components to the operator thanks to ergonomic shells
  • The state-of-the-art furnace control system allows for temperature ramping from ambient to 1100°C
  • Optional diffusible sampler piercer—you have the choice of diffusible, residual/total hydrogen determination
  • Gas dose calibration allows for calibration without reference materials

Theory of Operation

The DH603 determines the amount of residual (total) hydrogenu2014or diffusible and residual hydrogen with the optional pierceru2014in iron and ferrous alloys with a single instrument. The determinator features a user- friendly operating system and advanced furnace control.

Residual (total) hydrogen determination involves placing a pre-weighed sample into the furnace, allowing the hydrogen to be evolved by hot extraction into the flowing gas stream. Samples may be collected using a LECO vacuum pin tube or a similar technique. The hydrogen content is measured by a thermal conductivity detector. Final results are displayed in parts-per-million.

Diffusible and residual hydrogen determination involves placing a sampler in the optional piercing unit, which punctures the sampler, allowing the diffused molecular hydrogen to be purged into the carrier gas stream. The hydrogen is measured by a thermal conductivity detector. The sampler is then removed from the piercing unit and the outer shroud is removed, exposing a pin sample for residual hydrogen analysis. The sample is then weighed and placed into the resistance furnace, allowing the residual hydrogen to be introduced into the carrier gas stream by hot extraction. The hydrogen content is measured by a thermal conductivity detector. Final results are displayed in parts-per-million.

DH603 Hot Extraction Analyzer
  • DH603DC
    • with Diffusible Piercer
  • DH603C
  • Piercer Upgrade Kit
  • Inert Regulator
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