dh 603


Residual and Diffusible Hydrogen Determination by Hot Extraction

Hydrogen determinations are delivered quickly and precisely with the DH603 using residual, diffusible, and total hydrogen measurements. This robust instrument determines the amount of total hydrogen (or diffusible and residual hydrogen when equipped with the optional integrated sample piercer) present in ferrous alloys. A small footprint, user-friendly operating software, increased instrument safety and reliability are all part of the advanced DH603 design.



  • Exclusive ECLIPSE architecture—a unique design by LECO that improves reliability and serviceability
  • Improved plumbing—streamlined and efficient for faster maintenance of flow path
  • Accessible components—easily accessible to the operator thanks to ergonomic shells
  • Fixed furnace—more robust than tilting and vibrating designs
  • State-of-the-art furnace control system—allows temperature ramping from ambient to 1100°C
  • Optional diffusible sampler piercer—choice of diffusible, residual/total hydrogen determination
  • Gas dose calibration—allows calibration without reference materials


Sampler Options

LECO offers a variety of evacuated pin tubes and diffusible samplers for quick and easy hydrogen determination of molten metals.

Hydrogen Samplers




  • DH603DC Determinator with Windows®-based software, external PC, and diffusible piercer
  • DH603C Determinator with Windows-based software and external PC