GB/T 19901-2005

This standard specifies the functional dimensions for metal thermowells used to house thermometer sensors, ensuring compatibility and interchangeability across different manufacturers. It is applied in industrial process measurement and control systems, particularly in chemical, petrochemical, and power generation facilities where temperature sensors must be protected from corrosive or high-pressure environments. The standard provides dimensional guidelines for thermowell insertion lengths, thread connections, and bore diameters to facilitate accurate temperature readings and reliable sensor installation.