Updated standard: FM 6520, Dissolved Gas Analysis Monitoring Systems in Liquid-Immersed Transformers

FM Approvals Examination Standard 6520, Dissolved Gas Analysis Monitoring Systems in Liquid-Immersed Transformers, was updated in June 2025 and now encompasses the testing and certification of multi-gas dissolved gas analysis (DGA) systems for liquid immersed transformers. The updated standard can be downloaded here.

This enhancement to FM 6520 represents a significant milestone in transformer monitoring technology, including prescriptive examination procedures to test the enhanced reliability and precision that is seen in modern detection products. With the expanded scope of FM 6520, operators can now benefit from easier confirmations of optimal performance, comprehensive insights into transformer health, and a reduced risk of costly downtime.

You can find all FM Approved transformer monitoring solutions, and other tested and certified condition monitoring equipment, in the Approval Guide – our complimentary resource for real-time information pertaining to all FM Approved products.

FM Approvals’ commitment to innovation in property loss prevention continues to drive the evolution of industry standards, empowering businesses to safeguard their critical infrastructure with confidence.

If you are a manufacturer who is interested in testing and certifying a transformer health management solution or want to learn more about the requirements, please visit fmapprovals.com or contact us at [email protected].