In the above figure the technical description of the GENERAL THERMOWELLS is as follows :

• Process Connection : Provides a means of mounting, supporting, and/or sealing the thermowell into the      process system.

•  Types of process connection available:

     Threaded: Standard N.P.T.'s are 1/2”, 3/4”, and 1”.

     Socket Weld: Standard pipe sizes are 3/4” and 1” nominal. JMS socket wells are 3000lb rated. Other rating must be separately specified.

     Flanged Welded: Large variety of flange sizes and pound ratings available.

•  Shank Construction :

     Straight: The outside diameter is the same size along the immersion length.

     Step: The outside diameter at the end of the well is 1/2” to provide quicker response time.

    Tapered: Used for high velocity applications. The outside diameter decreases gradually along the immersion         length.

•  Q Dimension : The thickest part of the shank of the well on the hot side of the process connection or flange.      Its dependent on the bore size and the process connection size.

•  Bore Size : The inside diameter of a thermowell. Standard bore sizes are .260 and .385.

•  Immersion (“U”) Length : Immersion length of the Thermowell. The “U” length is measured from the bottom of  the process connection to the tip of the thermowell.

•  Lagging Extension (“T”) Length : The lagging extension exists behind the process connection andis used to extend the hex length and enable the probe to extendthrough insulation or walls.