Endress+Hauser M TW251 Specifications
Technical Information
TI245T/02/en
71105488
Thermowell for temperature sensors
omnigrad TW251
Thermowell for general applications
Integrated compression fitting
Threaded or weld-in process connection
TW 251 is a tube well fitted with an integrated compression fitting, suitable for
different industrial applications including
hygienic applications.
It is normally fitted onto pipes and vessels
or tanks where attachment to the process
can be threaded or welded.
Its construction, capable of housing
probes with a diameter of 6 mm, allows
for the combination with TST 42, TST 425,
TST 310, TEC 420 and TSC 310 temperature sensors.
Available in different executions (straight,
reduced or tapered), it has a an immersion length that can be chosen according
to the demands of the process.
Features and Benefits
• The compression fitting allows for the
replacement of the faulty probes without having to suspend the process
underway
• Sleeves for the compression fitting
available in PTFE or SS 316
• Different process connections can be
selected as standard within the sales
structure:
– threaded (G ½", G ¼", NPT ½", ...)
– weld-in (cylindrical, spheric)
• The 3.1.B material certificate (according to standard EN 10204), is selectable directly from the sale structure of
the product
omnigrad TW 251
Areas of application
Suitable for numerous applications including the food industries, it is generally used in all systems
that require a protection well for temperature sensors with a 6 mm diameter.
Especially suitable when the operator does not want to interrupt the process for replacement of a
damaged sensor, or to check for its correct operation.
Function and system design
Equipment architecture TW 251 is a thermowell made from a tube with an outer diameter of 9 mm. The inner di ameter of
the well allows for the combination of an inser t with a 6 mm diameter in the straight execution,
while the tapered and reduced executions can house an insert with a 3 mm tip. For further details
on the type of execution and process connections, refer to the chapter “System components”.
25
IL
3
Fig. 1: Overall dimensions of the TW 251
1/2” GAS
ØID
Ø9
25
IL
3
Material Wetted parts in SS 316L/1.4404.
Weight From 0.5 to 1.5 Kg for standard options.
Performance
1/2” NPT
ØID
Ø 9
25
30
IL
3
Ø 25
ØID
Ø 9
25
32
Ø25
IL
ØID
3
Ø 9
TW251X_G_dd_13_xx_01
Operating conditions Maximum process pressure
• 5 Mpa (50 bar) at 20°C
• 3.3 Mpa (33 bar) at 250°C
• 2.4 Mpa (24 bar) at 400°C
Maximum process temperature
• well stem 600°C
Maximum temperature of the compression fitting
• compression fitting with PTFE sleeve 180°C
• compression fitting with SS 316 sleeve 400°C
Maximum flow velocity
The maximum velocity of the process medium supported by the well is reduced when the immersion length exposed to the stream increases.
2 Endress+Hauser
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