About Setra Systems

Setra Systems, Inc. was founded by Dr. Y.T. Li and Dr. S.Y. Lee, esteemed engineering professors at the Massachusetts Institute of Technology and co-developers of the groundbreaking variable capacitance transduction principle. Their pioneering work laid the foundation for Setra’s legacy of precision sensing technology.

A Legacy of Innovation

For over five decades, Setra has been at the forefront of sensor design and manufacturing, delivering high-performance solutions across a wide range of industries. From cleanrooms to data centers, Setra’s sensors help ensure accuracy, safety, and efficiency where it matters most. Our products support critical applications in:



• HVAC & Building Automation
• Industrial OEM
• Test & Measurement
• Critical Environments

Our Home in Massachusetts

Since 1996, Setra’s corporate headquarters and primary production facility have been located in Boxborough, Massachusetts — just 25 miles northwest of Boston. This location serves as the hub for our engineering, manufacturing, and customer support operations.

Setra is proud to be part of the Ralliant group of companies, a diversified industrial growth organization based in Raleigh, North Carolina. At the heart of our culture is the Ralliant Business System (RBS) — a proven framework that drives our strategy, execution, and continuous improvement. RBS empowers our teams to innovate, measure performance, and deliver exceptional value to our customers.