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Trend and Wika Thermowells

Thermowell TyoesWika manufactures both Wika  and Trend labeled  line of thermometers as well as a complete selection of accessories.

Thermowells for temperature instruments are recommended for all process systems where pressure, velocity or viscous, abrasive and corrosive materials are present individually or in combination.  A properly selected thermowell will protect the temperature instrument from possible damage resulting from these process variables.  Furthermore, a thermowell permits removal of the temperature instrument for replacement, repair or testing without effecting the process media or the system.

Ordering Guide

Thermowells come in a variety of styles depending on the use. The most common ones are the: threaded, flanges and sanitary. For high pressure and temperature there are also: Socket, Wels and Weld-in types.

Threaded Thermowells

Threaded Thermowells


Flanged Thermowells


Sanitary Thermowells

Standard Features

  • Process Connections: Threaded, flanged, sanitary, socket, weld, weld-in
  • Instrument Connection: ½" NPSM standard (National Pipe Standard Mechanical; A straight pipe thread for mechanical joints)
  • Shank Configurations: Reduced, straight, tapered
  • Bore Diameter: .260", .385"
  • Materials: Brass, AISI 304, AISI 316
  • Surface Finish: Brass: 60-100 Ra; AISI 304 & AISI 316: 60-100 Ra sanitary (AISI 304 & AISI 316): 16-20 Ra

Thermowell Terminology

Process Connection:
External means to connect thermowell to process piping system. Wells can be threaded, bolted (to matching flange), clamped or welded in place.
Instrument Connection:
Internal threads to connect temperature instrument to thermowell.
"U" Dimension:
Length of well inserted into the piping system. Measured from the base of the process connection to the end tip of well.
"T" Dimension:
Also called lagging extension. Extends length between the instrument and process connections to accommodate vessel or piping insulation. Standard length is 3" (2" for a well with a 2½" "U" dimension).
"S" Dimension:
Instrument insertion length into well.
Bore Diameter:
Dimension of internal bore to match the diameter of the instrument stem/bulb inserted into the well. The .260" and .385" bore sizes fit instrument stem/bulb diameters of ¼" and 3/8" respectively. Bore length equals "S" dimension.
Root Diameter:
Diameter of well shank below process connection. This dimension varies with process connection and/or shank design.
Tip Diameter:
Diameter of well shank at the end tip of well. This dimension may vary with process connection and/or shank design.
Reduced Shank:
Also called reduced tip. The shank O.D. is reduced over the last 2½" of the "U" dimension from the standard root diameter to a ½" O.D. The stepped shank is available with a .260" bore size only.
Straight Shank:
Shank O.D. is the same from the root diameter to the tip diameter. The straight shank is generally used with a .385" bore size but a .260" bore size is available.
Tapered Shank:
Shank O.D. is gradually reduced from the root diameter to the tip diameter. Available with a .260" or .385" bore size. The tapered shank is recommended for heavy duty applications characterized by high vibration, pressure, temperature and/or velocity.

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