This standard BS IEC 61520:2000 Metal thermowells for thermometer sensors. Functional dimension is classified in these ICS categories:
25.040.40 Industrial process measurement and control
17.200.20 Temperature-measuring instruments
Specifies functional dimensions for metal thermowells for thermo-meter sensors of nominal diameters ranging from 3 mm to 8 mm for use in process control. The contents of the corrigendum of September 2017 have been included in this copy.