Endress+Hauser TU51, TU52, TU53, TU54 Specifications
TI01383T/09/EN/01.18
71391761
Products Solutions Services
Technical Information
TU51, TU52, TU53 and TU54
Heavy duty - general purpose thermowell made of drilled
barstock material
Application
The thermowell is designed for use with RTD and
thermocouple assemblies mainly in heavy duty applications for
process industries.
Your benefits
• Industry standard thermowells manufactured from round
barstock.
• The process connections can be weld-in, socket weld,
threaded, or flanged with double sided standard or full
penetration welds.
• The thermowell stem shape can be straight, stepped, or
tapered.
• Variable lag and immersion lengths.
• CRN approved thermowells
• The standard material of construction is 316/316L
• Special versions can be manufactured according to
specifications.
Installation instructions
L
3
2
4
TU51, TU52, TU53 and TU54
Installation Conditions
Design, dimensions
1 Installation examples
1-2 In pipes with a small cross section the sensor tip should reach or extend slightly past the center line of the
pipe (-L).
3-4 Tilted installation
The immersion length of the thermometer influences the accuracy. If the immersion length is too
short the measurement may be impacted by the pipe wall and process connection causing errors. If
installing into a pipe then the ideal immersion length should extend to or slightly past the center line
of the pipe, if possible (see 1 and 2), especially in laminar flow. A further solution could be an angled
(tilted) installation (see 3 and 4). When determining the immersion length, take into account all
process (e.g. flow velocity, viscosity, process pressure).
• Installation possibilities: Pipes, tanks or other plant components
• A general rule of thumb is to design the insertion length to be 10 times the diameter of the
thermowell.
Mechanical Construction
All dimensions in inches. For values related to the graphics please refer to the tables and equations
below.
A0023412
2 Endress+Hauser
TU51, TU52, TU53 and TU54
¼”
¼”
"5/8”
1¾”
+ T
1¾”
+ T
Q
1
U
U
A
A
P P
2¼”
+ T
U
4
6
1
2
3
"0.26”
"0.26”
¼”
5
7
"0.26”
A
¼”
Q
1
Q
1
Q
2
Q
2
Q
2
A
¾”
¼”
T
U
2½”
1”
"0.26”
Q
1
Q
2
A0035779
2 Dimensions of the thermowells
1 TU51 weld-in thermowell (tapered)
2 TU52 socket weld thermowell (tapered)
3 TU53 threaded thermowell (stepped)
4 TU54 flange thermowell (tapered)
5 Full penetration weld thermowell
6 Standard weld thermowell
7 Straight thermowell tip
P Pipe size
Q1 Thermowell root diameter
Q2 Thermowell tip diameter
T Lag dimension
U Thermowell immersion length
A Drill depth of thermowell
Dimensional Details
General Dimensions
Type Weld-in Socket-weld Threaded Flanged
Process Connections ¾" and 1" ¾" and 1" ½", ¾" and 1" 1", 1-½", 2"
Immersion Length 2" to 24"
Lag Length Up to 6" (in ½" increments)
Instrument Connection ½" NPT
TU51 TU52 TU53 TU54
ANSI Flange
150 to 1500 RF
Endress+Hauser 3
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