A non-intrusive vacuum hydrogen probe that can maintain a leak-tight seal has been
successfully designed and field tested. Industrial installations and laboratory testing of this
hydrogen probe have confirmed that the integrity of the probe to vessel seal can be maintained
indefinitely throughout continuous high temperature operation (up to 500 oC) as well as
repeated temperature transients. The present paper discusses the unique sealing technology
of this probe, focusing on data which confirms the robustness and reliability of the seal.
Keywords: corrosion monitoring, hydrogen flux, vacuum hydrogen probe, leak-tight seal