Endress+Hauser M TW11 Specifications
TI 00262T/02/EN/13.19
71443137
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Technical Information
Thermowell
omnigrad M TW 11
Pipe thermowell without extension neck
Threaded process connection
Application
Omnigrad M TW 11 thermowells are designed for the use in the
fine chemicals industry but can also be used for generic applications.
Thanks to its modular configuration, defined in standard DIN
43772 (form 2/3), the TW 11 thermowell is suitable for almost
all industrial processes.
Features and benefits
• SS 316L/1.4404 e SS 316Ti/1.4571 for "wetted" parts
• The common threaded process con
standard; others are available on request
• Customized immersion length
• Surface finishing Ra < 0.8 μm
• Tip of the thermowell with a reduced diameter or tapered for
a faster response time
• Material certification (3.1.B)
• Pressure test
• Test with penetrant liquids on welds
nections are supplied as
Areas of application
TW11_g_gd_13_xx_01
• Fine chemicals industry
• Light energy industry
• Food industry
• General industrial services
Function and system design
Equipment architecture The design of the thermowell is based on standard DIN 43772 and can therefore guarantee a good
level of resistance to the most typical and common industrial processes.
The thermowell is made from a pipe with a diameter of 9, 11 or 12 mm.
The final part can be straight, tapered (i.e. with a gradual reduction of the stem achieved thanks to a
swaging procedure), or reduced (stepped).
TW 11 thermowell can be fitted on the plant (pipe or tank) using a threaded connection, which can be
chosen from the most common models (see section "Structure of components").
Fig. 1: TW 11 with several types of process connections and end parts of the thermowell
Material Wetted parts in SS 316L/1.4404 or SS 316Ti/1.4571.
Weight From 0.5 to 2.0 Kg for standard options.
2
Performance
Grafic_g_gd_05_en_06
Grafic_g_gd_05_en_16
Operating conditions Process temperature
• 316L/1.4404 -200 ÷ 600°C
• 316Ti/1.4571 -200 ÷ 800°C
Maximum process pressure
The pressure values to which the thermowell can be subjected at varying temperatures are illustrated
in the drawings of figures 2 and 3. A possible limitation can originate from process connections. For
pipes with a diameter of 9 mm, with a limited flow rate, the thermowell can tolerate the following
maximum pressures:
• 50 bar at 20°C
• 33 bar at 250°C
• 24 bar at 400°C.
Maximum flow velocity
The maximum flow velocity tolerated by the thermowell decreases as the length of the well/probe,
exposed to the stream of the fluid, increases. Some information is provided in the drawing of
figures 2 and 3.
Fig. 2: Pressure/temperature drawing for thermowell with a straight pipe Ø11 mm in SS 316Ti/1.4571
Fig. 3: Pressure/temperature drawing for thermowell with tapered pipe Ø12 mm in SS 316Ti/1.4571
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