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iTHERM SurfaceLine TM611 Surface thermometer
New

Non-invasive RTD/TC thermometer with high measurement performance for demanding applications

Office situation support
Have questions about this product?

iTHERM SurfaceLine TM611 Surface thermometer
New

Non-invasive RTD/TC thermometer with high measurement performance for demanding applications

Get a quote
Office situation support
Have questions about this product?

Benefits

  • Measurement accuracy and response time comparable with invasive measurements
  • No process opening required, no leakage risk
  • Increased safety for personnel, plant and the environment
  • User-friendly from product selection to installation and maintenance
  • Significant cost savings: shorter development and project planning times, reduced expenses for installation, certification and inspections as well as no costs for thermowells, nozzles and flanges, weld seam inspections and pipe extensions.
  • iTEMP temperature transmitter with all standard communication protocols and optional Bluetooth® connectivity
  • International certification: e.g. explosion protection according to ATEX, IECEx, CSA and NEPSI; functional safety (SIL)
FLEXible answers to individual needs
Current product

iTHERM SurfaceLine TM611 Surface thermometer

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  • High-end products
  • Highly functional and convenient

What is FLEX?

FLEX selections
Technical excellence
Simplicity
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Fundamental selection Meet your basic measurement needs
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Lean selection Handle your core processes easily
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Extended selection Optimize your processes with innovative technologies
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Xpert selection Master your most challenging applications
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Manufacturer's warranty

Engineered for confidence

Our instruments are designed for long‑lasting performance, precise measurement, and dependable operation in demanding industrial environments. Each product includes a standard manufacturer’s warranty that reflects our commitment to quality and to the trust you place in our solutions.

Should a warranty case occur, the device will be assessed and the applicable remedy will be provided in line with the warranty terms – helping ensure a reliable and efficient resolution and supporting continued operation of your measurement point.

Request for extended warranty

If you require extended warranty coverage, simply contact your local Endress+Hauser representative. Our experts will advise you on the available options to match your application and risk profile, helping you protect your investment, reduce unexpected repair costs, and ensure reliable long‑term operation beyond the manufacturer's warranty period.

Learn more

Warranty terms apply

The manufacturer's warranty and extended warranty are 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.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

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My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

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Product information

Non-invasive temperature assembly TM611
iTHERM SurfaceLine TM611
Specifications
Measuring / Application task Thermometer
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Description

The non-invasive thermometer iTHERM SurfaceLine TM611 is used across all industries to measure temperature without the risk of leakage and process disruption. The device is safe and easy to install and provides the same accuracy and response time as invasive temperature measurement. A specially designed thermal coupling element provides ideal thermal conductivity to the sensor and reduces ambient influences, resulting in superior measurement performance even compared to electronic compensation.

Field of application
  • Can be used universally in all industries
  • Ideal for demanding process conditions such as high flow velocities, high process pressures, highly viscous or corrosive media, abrasion, pigging or small pipe diameters
  • Perfect for subsequent installation for measurements in existing facilities for energy and safety monitoring
Benefits
  • Measurement accuracy and response time comparable with invasive measurements
  • No process opening required, no leakage risk
  • Increased safety for personnel, plant and the environment
  • User-friendly from product selection to installation and maintenance
  • Significant cost savings: shorter development and project planning times, reduced expenses for installation, certification and inspections as well as no costs for thermowells, nozzles and flanges, weld seam inspections and pipe extensions.
  • iTEMP temperature transmitter with all standard communication protocols and optional Bluetooth® connectivity
  • International certification: e.g. explosion protection according to ATEX, IECEx, CSA and NEPSI; functional safety (SIL)
Downloads
Most downloaded
Technical Information (TI)
TI iTHERM SurfaceLine TM611 Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for demanding applications
English version - 01/2025
Download
Operating Instruction (BA)
BA iTHERM SurfaceLine TM611 Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for demanding applications
English version - 01/2025
Download
Short Instruction (KA)
KA iTHERM SurfaceLine TM611 Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for
demanding applications
English version - 12/2024
Download
The CAD Drawings will be available after the configuration.
All downloads
63 Downloads
Technical Information (TI)
Most downloaded
TI iTHERM SurfaceLine TM611 Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for demanding applications
English version - 01/2025
Download
Operating Instruction (BA)
Most downloaded
BA iTHERM SurfaceLine TM611 Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for demanding applications
English version - 01/2025
Download
Short Instruction (KA)
KA iTHERM SurfaceLine TM611 Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for
demanding applications
English version - 12/2024
Download
Installation Instructions (EA)
Information Typenschild DIENST-T Information zur Typenschild Bestellung mit DIENST-T
English version - 11/2025
Download
Ex Safety Instruction (XA)
XA iTHERM SurfaceLine TM611 ATEX, IECEx:
Ex db IIC T6 Gb
Ex tb IIIC Txxx °C Db
English version - 01/2024
Download
Ex Safety Instruction (XA)
XA iTHERM SurfaceLine TM611 ATEX, IECEx:
Ex ia IIC T6 Ga/Gb
Ex ia IIIC Txxx °C Da/Db
English version - 01/2024
Download
Ex Safety Instruction (XA)
XA iTHERM SurfaceLine TM611 Ex ia IIC T6...T1 Ga
Ex ia IIC T6...T1 Gb
Ex ia IIIC T<sub>200</sub>85 °C...T<sub>200</sub>450 °C Da
Ex ia IIIC T85 °C...T450 °C Db
English version - 07/2025
Download
Ex Safety Instruction (XA)
TM111, TM131, TM611: cCSAus XP DIP NI TM111, TM131: cCSAus XP DIP NI
English version - 01/2025
Download
Ex Safety Instruction (XA)
iTHERM TM111, TM131 Control drawing CSA IS, NI, DIP Thermometer
Installation Notes for hazardous locations
Intrinsically safe, Nonincendive, Dust ignition proof
English version - 09/2024
Download
Ex Safety Instruction (XA)
XA iTHERM SurfaceLine TM611 1Ex d IIC T6...T1 Gb X
Ex tb IIIC T85°C…T450°C Db X
English version - 10/2025
Download
Ex Safety Instruction (XA)
XA iTHERM SurfaceLine TM611 0Ex ia IIC T6…T1 Ga Х
Ex ia IIIC T<sub>200</sub>85°C…T<sub>200</sub>450°C Da X
1Ex ia IIC T6…T1 Gb Х
Еx ia IIIC T85°C…T450°C Da/Db Х
English version - 10/2025
Download
Ex Safety Instruction (XA)
XA iTHERM SurfaceLine TM611 Ex db IIC T6...T1 Gb
Ex tb IIIC T85 °C...T450 °C Db
English version - 07/2025
Download
Ex Safety Instruction (XA)
XA TRxx, TCxx, TEC420, TPx100, TSx310, iTHERM TS111/TM211/TM41x/TM1xx/TM611 RTD/TC thermometers
ATEX:
Ex nA IIC T6 Gc
Ex ec IIC Txxx°C Gc
Ex tc IIIC Txxx°C Dc
English version - 07/2025
Download
Functional Safety (FY)
FY iTHERM ModuLine TM1x1, iTHERM SurfaceLine TM611  
English version - 04/2025
Download
PU (Publication)
Temperature measurement Thermometers and transmitters for the process industry
English version - 07/2026
Download
Case Study (CS)
Pfeifer Holz improved efficiency with non-invasive monitoring. Pfeifer Holz improved efficiency with non-invasive monitoring.
Czech version - 07/2026
Download
Innovation (IN)
Riformulazione della misura di temperatura non-invasiva! Riformulazione della
misura di temperatura
non-invasiva!
L'alternativa adatta a condizioni di processo
difficili: iTHERM SurfaceLine TM611
Italian version - 04/2025
Download
Innovation (IN)
Nicht-invasive Temperaturmessung neu definiert! Die Alternative für raue Prozessbedingungen:
iTHERM SurfaceLine TM611
German version - 02/2025
Download
Innovation (IN)
Redéfinir la mesure de température non intrusive ! L'alternative pour
les conditions de
process exigeants :
iTHERM SurfaceLine TM611
French version - 05/2026
Download
Innovation (IN)
Redefining non-invasive temperature measurement! The alternative for harsh process conditions:
iTHERM SurfaceLine TM611
English version - 02/2025
Download
Innovation (IN)
革新的な非挿入型温度測定 過酷なプロセス条件のための選択肢:
iTHERM SurfaceLine TM611
Japanese version - 08/2025
Download
White paper (WP)
Reducing complexity in data center cooling temperature measurements Endress+Hauser’s iTHERM SurfaceLine
TM611 non-invasive temperature measurement
performs comparably to traditional industrial
thermometers with an elegant mechanical innovation
English version - 07/2025
Download
AI (Application note)
Gesteigerte Effizienz und Sicherheit von Wärmetauschern durch genaue, nicht-invasive Temperaturmessung
German version - 02/2025
Download
AI (Application note)
Temperature measurement in hydrogen production with iTHERM SurfaceLine TM611 Non-invasive temperature measurement redefined
English version - 07/2025
Download

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Non-invasive temperature assembly TM611
iTHERM SurfaceLine TM611
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Spare parts

further parts
further parts

Terminal Head TA30A

further parts
further parts
Order code TA30A-
Drawing number 1
further parts
further parts

Terminal Head TA30D

further parts
further parts
Order code TA30D-
Drawing number 1
further parts
further parts

Spare parts kit sealing TA30A/TA30D

further parts
further parts
Order code 71182602
Drawing number 1
further parts
further parts

Terminal Head TA30EB

further parts
further parts
Order code TA30EB-
Drawing number 1
Spare parts

Selection of compatible products

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