Patented Multi - Zone Temperature Control Technology2: Additel Corporation's new ADT 875 - 1210 and ADT 878 - 1210 thermocouple calibration furnaces feature this technology. It combines patented - pending wind tunnel control technology with a 3 - zone temperature control system to provide an extremely stable and uniform heat source. This ensures the best possible calibration results and addresses the challenges associated with thermocouple calibration, offering high - temperature calibration and verification with unmatched stability and uniformity.

Isothermal Block Design for Long Thermocouples: Thermansys has developed a special construction for calibrating long K - type thermocouples. They created a 1300 - mm - long, three - zone tube furnace with an isothermal block inside. The long thermocouple makes closed contact with the isothermal block body to ensure a uniform radial temperature distribution, and axial uniformity is achieved through the three - zone design. The furnace has five holes for inserting calibration reference thermocouples, which measure the same points as the five calibration thermocouple junctions, ensuring accurate calibration.

Improved Temperature Uniformity in Work Tubes5: The PTC thermocouple calibration furnace by Carbolite Gero features a special work tube design that offers better temperature uniformity than typical furnaces of its size. It has a maximum operating temperature of 1200 °C, a high - stability heat source within the temperature range of 400 - 1150 °C, and accepts thermocouples up to 7.5 mm in diameter. The metallic work tube is earthed for operator safety, and it heats up and stabilizes quickly, making it suitable for use in laboratories or on - site.