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Protection tube for temperature sensors

TW12 ©Endress+Hauser
TW12 ©Endress+Hauser
TW12 ©Endress+Hauser

Designed for use in the fine chemicals industry and generally for almost all industrial processes

This protection tube is an important component for temperature measurement points for almost all industrial processes, especially for fine chemicals industries. It is used to protect the measuring insert or sensor elements from aggressive process media, high pressures and flow rates from the temperature sensor itself and thereby enables the thermometer to be exchanged during operation.

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  • Benefits

    • Tip of the thermowell with a reduced diameter or tapered for a faster response time

    • Customized immersion length

    • Surface finishing Ra < 0.8 μm

    • SS 316L/1.4404 and SS 316Ti/1.4571 for the "wetted" parts

    • The common threaded process connections are supplied as...

  • Field of application

    TW12 protection tubes are designed for the use in the fine chemicals industry but can also be used for generic applications.

Features and specifications



  • Measuring principle

    Fabricated Thermowell

  • Characteristic / Application

    metric style

    DIN 43772 Form 2/3

    process connection as compression fitting

    with neck

  • Head connection

    external thread:

    M24 x 1.5

    1/2" NPT

  • Maximum standard immersion length

    4.000 mm (157,48")

  • Max. immersion length on request

    10.000 mm (393,7")

  • Process connection

    compression fitting:




    1/2" NPT




    M20 x 1.5

  • Thermowell root diameter

    9 mm (0,35")

    11 mm (0,43")

    12 mm (0,47")

    14 mm (0,55")

    15 mm (0,59")

  • Medium contact material

    1.4404 (316L)

    1.4571 (316Ti)

    1.4843 (310)

    2.4816 (Alloy 600)

    2.4819 (Alloy C276)

  • Wetted part finishing (Ra)

    < 0.8 ìm (31.50 ìin)

  • Tip shape




  • Temperature range

    -200...1.100 °C (-328...2.012 °F)

  • Max. process pressure (static)

    50 bar (725 psi)

  • Max. process pressure at 400 °C

    depends on process connection

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