Founded in 1972, Aalborg Instruments & Controls manufactures precision instruments for measuring and controlling gas flow, from thermal mass flow controllers to variable-area rotameters and valves. Its two-division operation also supports flow calibration, including NIST-traceable work and A2LA-accredited gas calibrations through the AALFA-KAL metrology laboratory. Aalborg has maintained ISO 9001 certification since 1995.
ISO 9001:2015
ISO/IEC 17025:2017
A2LA Accreditation
ANSI/NCSL Z540-1-1994
Compliance program
MIL-STD-456624A
Compliance program
ISO17025
Quality certification
Key InstrumentsSince 1946, Key Instruments has developed precision fluid measurement and control technology, with a focus on flow meters for air, water and gas applications. Its best-known 2500 Series uses precision-machined, unibody acrylic construction and can be adapted for project and OEM requirements through three levels of customization. The company also provides application expertise to help engineers configure flow, pressure and vacuum instrumentation for real-world process challenges.CROYDON, PA
Brooks InstrumentFounded in 1946 as a single instrumentation company, Brooks Instrument has built its identity around precision process measurement and control. Its instruments serve demanding manufacturing and laboratory applications, with a particularly large installed base of mass flow controllers and global support for customers in fields such as semiconductor production.334513HATFIELD, PA
Calgaz LtdCalgaz began as a Cambridge, Maryland, company in 1976 and became an Air Liquide-owned business after pioneering the calibration-gas market. Its development of the four-gas “Quad” mixture in 1991 helped simplify instrument testing, and the company now supports safety-critical users worldwide through three manufacturing sites. Calgaz’s quality system includes ISO 9001, ISO/IEC 17025, and ISO 17034 accreditations.CAMBRIDGE, MD
Thermal Instrument CompanyBorn in 1959 in founder Fred Curran’s basement, Thermal Instrument Company designs, manufactures, and calibrates thermal mass flow meters and flow switches for measuring liquids and gases. Still a family- and veteran-run business in Trevose, Pennsylvania, the company makes its instruments in the USA and supports them with local calibration and field service. Its meters are used in demanding settings from renewable natural gas and petrochemical plants to semiconductor fabrication, with more than 20,000 devices installed worldwide.334513FEASTERVILLE TREVOSE, PA