Setra Systems

Setra Systems is an American electronics company founded in 1967 by brothers Dr. Y.T. Li and Dr. S.Y. Lee, both engineering professors at MIT who co-developed the variable capacitance transduction principle. The company manufactures electronic instruments that measure pressure, acceleration, and weight, with products used primarily in industrial manufacturing, HVAC, and pharmaceutical cleanroom applications.

Headquartered in Boxborough, Massachusetts (25 miles northwest of Boston), Setra designs and manufactures pressure, humidity, temperature sensing products, environmental monitoring systems, and particle counters. Setra positions its Model 264 low differential pressure transducer as the standard for HVAC pressure measurements in pharmaceutical and healthcare facilities.

Setra was part of the Fortive family from 2016, merging with Gems Sensors in 2022 to form the Gems Setra business unit within Fortive's Precision Technologies segment. In 2025, following Fortive's corporate separation, Setra became a member of the Ralliant family, a diversified industrial organisation based in Raleigh, North Carolina.

Key product lines include the CEMS (Continuous Environmental Monitoring System) for cleanroom monitoring and the FLEX environmental monitor for pharmaceutical manufacturing and healthcare facilities.

Setra serves pharmaceutical and life sciences industries with environmental monitoring solutions designed for cleanroom and critical environment applications. The CEMS (Continuous Environmental Monitoring System) platform is specifically designed for pharmaceutical manufacturing with compliance support for FDA 21 CFR Part 11, EU Annex 11, USP 797/800, and ISO 14644.

Key applications include cleanroom monitoring, compounding pharmacy environments, bio-safety laboratories, and pharmaceutical manufacturing facilities. The FLEX environmental monitor supports USP 797 and USP 800 compliance for pharmacy compounding areas.

Setra's Model 264 and Model 267 low differential pressure transducers are widely used in high-accuracy pharmaceutical applications. Setra positions its sensors as industry standards for HVAC building automation in pharmaceutical and healthcare facilities.

Setra is a privately held subsidiary of Ralliant, a diversified industrial organization based in Raleigh, North Carolina. Previously part of Fortive Corporation's Precision Technologies segment alongside brands including Anderson-Negele, Gems, Hengstler-Dynapar, Qualitrol, Pacific Scientific, Keithley, and Tektronix.

Setra merged with Gems Sensors in 2022 and transitioned to Ralliant ownership in 2025 following Fortive's corporate separation. Revenue figures not publicly disclosed.

Setra offers sensing and environmental monitoring products across six categories:

CEMS (Continuous Environmental Monitoring System): Enterprise cleanroom monitoring platform with FDA 21 CFR Part 11 and EU Annex 11 compliance support. Monitors temperature, humidity, pressure, particle counts, CO2, and other parameters.

FLEX Environmental Monitor: Multi-parameter room monitoring and control solution with 7-inch touchscreen. Supports 3 rooms with up to 6 parameters each (18 total). USP 797/800 compliant.

Pressure Sensors & Transducers: Industry-standard differential, absolute, barometric, gauge, and submersible pressure sensors. Model 264 and Model 267 transducers for pharmaceutical HVAC applications.

Particle Counters: SPC3000 family for cleanroom particle monitoring with remote capabilities.

Temperature & Humidity Sensors: Environmental parameter measurement for critical environments.

Wireless Sensing: New product line with Wi-Fi communication supporting temperatures to -200°C.

Setra is part of Gems Setra within the Ralliant organization, providing combined sensing capabilities across medical, industrial, food and beverage, and off-highway vehicle markets.

Products available through authorized distributors including FLW Southeast, Instrumart, BioPharm World, Honeywell Building Solutions, and Alpha Controls. Integration partnerships with building management system providers via BACnet/IP and BACnet MS/TP protocols.

Security partnership with third-party security firm for OWASP Top 10 vulnerability identification and 24/7 vulnerability scanning of CEMS platform.

Support through Setra direct and authorized distribution network. Technical documentation and application notes available through website resource center.

Products designed for easy installation with standard electrical box mounting. FLEX monitor features USB cloning for rapid multi-unit deployment and requires no programming—configuration through touch screen menus.

Blog content and educational resources covering 21 CFR Part 11 compliance, cleanroom environmental monitoring best practices, and regulatory requirements.

Setra Systems holds ISO 9001:2015 certification for quality management. Founded in 1967 by MIT engineering professors who co-developed the variable capacitance transduction principle, the company has operated for 55+ years.

Setra positions the Model 264 low differential pressure transducer as the industry standard for HVAC pressure measurements in pharmaceutical and healthcare facilities.

Key milestones include first ultra-high purity product (1977), "squashed" sensor (1995), first room pressure monitor (2008), and first power meters (2014). Company celebrated 50th anniversary in 2017.

Setra has operated in the environmental monitoring and precision sensing market for 55+ years. CEMS and FLEX product lines serve pharmaceutical cleanroom monitoring.

Products are available through multiple distribution channels, including direct sales, industrial distributors, and building automation integrators. The company publishes blog content on cleanroom monitoring and regulatory compliance topics.

In 2025, Setra launched new wireless sensing product line for expanded environmental monitoring capabilities.