About UPC-Marathon

UPC-Marathon, a division of Nitrex, is a global leader in process control instrumentation for the heat treating industry. With over 50 years of experience, we design, manufacture, and support a comprehensive range of products including oxygen probes, process controllers, gas analyzers, flow meters, gas generators, and production management software.

Our mission is to help manufacturers achieve precise, repeatable, and efficient thermal processing through advanced instrumentation and control technology. We serve customers across automotive, aerospace, defense, energy, medical, and many other industries worldwide.

Founded on a commitment to innovation, UPC-Marathon continues to push the boundaries of process control technology. Our products are engineered for reliability and accuracy in the most demanding industrial environments, from carburizing and nitriding furnaces to combustion systems and gas generation equipment.

As part of the Nitrex group, we leverage decades of metallurgical expertise and a global network of offices and service centers to provide comprehensive support — from initial consultation and system design through installation, commissioning, and ongoing technical assistance.

Our headquarters in Skokie, Illinois, USA houses our primary engineering, manufacturing, and R&D facilities, with additional offices in Germany and representatives worldwide. We are committed to providing responsive, knowledgeable customer support wherever our equipment operates.