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Product picture of Thermometer with RTD or TC insert TM121

iTHERM ModuLine TM121
Industrial modular thermometer

Fundamental metric RTD/TC thermometer with welded thermowell for a wide range of industrial applications

TM121
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5-year warranty

Engineered for Confidence

Our Fundamental Selection instruments feature an extended 5-year warranty – a clear testament of our trust in their long-term reliability and performance.

Should a warranty case occur, you can count on a fast replacement process and minimal administrative effort – giving you peace of mind when it matters most and helping you keep your operations running smoothly.

Warranty terms apply

The extended warranty is subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

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20 documents
    • Technical Information (TI)

    TI iTHERM ModuLine TM121

    • Technical Information (TI)
    English version - 03/2024
    New version available in English

    Thermometer with RTD or TC insert complete with thermowell manufactured
    from pipe or tube material

    • Operating Instruction (BA)

    BA iTHERM ModuLine thermometer

    • Operating Instruction (BA)
    English version - 11/2024
    New version available in English

    Universal, modular RTD/TC thermometers for a wide range of industrial applications

    • Short Instruction (KA)

    KA iTHERM ModuLine thermometer

    • Short Instruction (KA)
    English version - 04/2025
    New version available in English

    Universal, modular RTD/TC thermometers for a wide range of industrial applications

    • Ex Safety Instruction (XA)

    TRxx, TCxx, TS211, iTHERM TS111, TM211, TPx100, TSx310, TM1x1, TM411, TM412

    • Ex Safety Instruction (XA)
    English version - 07/2020
    New version available in English

    Thermometers and inserts
    Ex nA IIC T6...T1 Gc

    • Special Documentation (SD)

    Device viewer

    • Special Documentation (SD)
    English version - 07/2021
    New version available in English

    Technical documentation in other languages

    • Special Documentation (SD)

    SD IEC 61406-1

    • Special Documentation (SD)
    English version - 05/2023
    New version available in English

    Automatic identification of physical objects

    • Innovation (IN)

    Reduce complexity, achieve simplicity.

    • Innovation (IN)
    English version - 12/2024
    New version available in English

    iTHERM ModuLine — easily configurable
    to your needs.

    • Innovation (IN)

    Komplexität reduzieren, Einfachheit erreichen.

    • Innovation (IN)
    German version - 02/2025
    New version available in English

    iTHERM ModuLine – einfach konfigurierbar für Ihre Bedürfnisse.

    • Innovation (IN)

    Ridurre la complessità, raggiungere la semplicità.

    • Innovation (IN)
    Italian version - 04/2025
    New version available in English

    Ridurre la complessità,
    raggiungere la semplicità.
    iTHERM ModuLine — facile da configurare
    in base alle vostre esigenze.

    • Manufacturer Declaration

    Product family: Process RTD general purpose

    • Manufacturer Declaration
    Chinese version - 03/2020
    New version available in English

    Product root: TM121-
    Declaration number: HE_01246_01.20
    Manufacturer specification: RoHS
    Additional information: China RoHS