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About TSI

Where Research Meets Reality

TSI Incorporated serves a global market by investigating, identifying and solving measurement problems. As an industry leader in the design and production of precision measurement instruments, TSI partners with research institutions and customers around the world to set the standard for measurements relating to aerosol science, air flow, indoor air quality, fluid dynamics and biohazard detection. With headquarters based in the U.S. and field offices throughout Europe and Asia, TSI has established a worldwide presence in the markets we serve. Every day, our dedicated employees turn research into reality.

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Getting to Know Us

TSI has a worldwide presence with over 400 dedicated employees working in facilities in North America and Europe and Asia. Our corporate sales and service offices (St. Paul, Minnesota, USA; Aachen, Germany; Marseille, France; High Wycombe, United Kingdom; Beijing, China, and Bangalore, India) provide regional customer support. We also maintain a network of knowledgeable manufacturers’ representatives and distributors to provide local support worldwide.

TSI has three wholly owned subsidiaries: Environmental Systems Corporation (Knoxville, Tennessee), a leading supplier of products and services for outdoor environmental monitoring, DICKEY-john® Corporation (Auburn, Illinois), a manufacturer of specialized instrumentation used in public works and agriculture, and Tekran® Instruments Corporation (Knoxville, Tennessee), a premier supplier of ambient mercury monitory technology. Our facilities total more than 425,000 square feet of space devoted to product development, manufacturing and customer support.

TSI researchers and engineers have been granted more than 50 patents and have a proven record of developing instruments that are the first, the only, the best of their kind. Participation in societies and standards committees has long been a TSI priority. Our engineers have chaired or sat on a variety of committees in organizations such as ASHRAE, ANSI, AIHA, and AAAR**.

Our staff and products are involved in current global issues, such as diesel engine exhaust reduction, biohazard protection, homeland security, environmental pollution, workplace comfort, and facility monitoring. Data provided by our instruments are used in monitoring and research applications destined to have a long-term impact on humankind and the world around us.

**American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE), American National Standards Institute (ANSI), American Industrial Hygiene Association (AIHA), and American Association for Aerosol Research (AAAR).

TSI Product Lines

Aerosol generators and dispersers

Airflow Instruments

Alnor Instruments

Atmospheric monitoring

Automated filter test

Biomedical test equipment

Chemical characterization

Combustion gas analyzers

Contamination control

Critical environments monitors and controllers

Exposure monitoring