Q Dimension: The thickest part of the shank of the well on the hot side of the process connection or flange. It is dependent on the bore size and the process connection size.
Bore Size The inside diameter of thermowell. In other words, the diameter of the internal cylindrical cavity of a thermowell or protection tube Standard bore sizes are 6.5 mm, 8.5 mm.
Immersion (“U”) Length: The length of a thermowell or protection tube below the mounting threads, flange, bushing, etc. extending into the process area. The “U” length is measured from the bottom of the process connection to the tip of the thermowell.
Lagging Extension (“T”) Length: The length of a thermowell, in addition to the standard head lengths, required to make the head of the thermowell accessible and this enable the probe to extend through insulation or walls.
Internal Mounting Thread: The thread within the thermowell for attaching a temperature device of the union and nipple extension for a thermowell assembly.