Diaphragm seal systems offer protection to pressure transmitters, but some process fluids and aggressive chemicals can affect instrument integrity, leading to failure or even complete instrument replacement. Hydrogen is a molecule that can permeate metal by diffusing into the surface. For a pressure transmitters thin metal diaphragm this can lead to a loss in ductile and tensile strength, or introduce Hydrogen bubbles into the internal fill fluid. Adhering a thin layer of gold to a base metal provides protection against hydrogen permeation, extending the life of instrumentation and protecting your investment.