iTHERM SurfaceLine TM611
Surface thermometer

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

TM611

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Non-invasive temperature sensor for industrial plants — Version with aluminium terminal head TA30A, 20° angle, DN25, 1 ", outside pipe ⌀ 33.7 mm

Tm611 aluminium mounted on pipe — Mounting on the outer pipe wall: **elimination of leakages, process contamination, flow disturbance**

Non-invasive measurement for big pipe diameters — Version with explosion-proof terminal head TA30H, 90° angle, DN150, 6 ", outside pipe ⌀ 168.3 mm

Explosion-proof non-invasive temperature sensor — Version with explosion-proof terminal head TA30H, 20° angle, DN25, 1 ", outside pipe ⌀ 33.7 mm

Hygienic non-invasive thermometer — Version with stainless steel terminal head TA30R, 20° angle, DN25, 1 ", outside pipe ⌀ 33.7 mm

Cable probe non-invasive — Version with cable probe TST310, 20° angle, DN25, 1 ", outside pipe ⌀ 33.7 mm

Non-invasive thermal coupling element for pipe — Thermal coupling element with **advanced geometry** and **heat transfer material** for optimized heat transfer; **stainless steel clamps** for easy installation

Non-invasive thermometer for energy monitoring — Ideal for energy monitoring

Version with aluminium terminal head TA30A, 20° angle, DN25, 1 ", outside pipe ⌀ 33.7 mm

Specs at a glance

Accuracy

depending on application
Class AA acc. to IEC 60751
Class A acc. to IEC 60751
Class B acc. to IEC 60751
Class special or standard acc. to ASTM E230
Class 1 or 2 acc. to IEC 60584-2
Response time

depending on application
Operating temperature range

-196 °C…400 °C (-320,8 °F...752 °F)

See all specifications

Field of application

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.

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)

Videos

Explore our unique product design and components
Comparison with invasive thermometers: accuracy and response time
Benefits of iTHERM SurfaceLine TM611

Extended selection

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Standard products
Reliable, robust and low-maintenance

Technical excellence

Simplicity

What is FLEX?

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Specialized products
Designed for demanding applications

Technical excellence

Simplicity

Variable

What is FLEX?

FLEX selections	Technical excellence	Simplicity
F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
F L E X Extended selection Optimize your processes with innovative technologies	Technical excellence	Simplicity
F L E X Xpert selection Master your most challenging applications	Technical excellence	Simplicity Variable

Learn more about the FLEX selections

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Success stories

Innovative non-invasive temperature measurement for hydrogen

Since the temperature of compressed hydrogen increases with expansion during filling, temperature measurement is essential at hydrogen filling stations for safety reasons.
Read the full story
Optimized temperature control in steam power plants

Our non-invasive thermometer can be easily retrofitted to the existing pipe and integrated into the control system to enable efficient stand-by operation of a turboset.
Read the full story
Boost heat exchanger efficiency and safety

The non-invasive thermometer iTHERM SurfaceLine TM611 measures temperature accurately and fast, optimizing heat exchanger performance and efficiency.
Read the full story
Temperature measurement in hydrogen production

Temperature measurement in hydrogen production with the iTHERM SurfaceLine TM611 - Non-invasive temperature measurement redefined
Read the full story
Precise and durable temperature control in preheaters

Precise and durable temperature control in preheaters - Boost efficiency, cut emissions and save energy in cement production
Read the full story

Could also interest you

Media
eBrochure iTHERM SurfaceLine TM611

Achieve superior accuracy, increased safety and remarkable time and cost savings with iTHERM SurfaceLine TM611 across heavy industries.
More information
Products
Redefining non-invasive temperature measurement!

iTHERM SurfaceLine TM611 measures process temperature without the risk of leakage and process disruption while offering superior measurement performance compared to electronic compensation.
More information

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44 documents

Technical Information (TI)

TI iTHERM SurfaceLine TM611

Technical Information (TI)

English version - 01/2025

New version available in English

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

Select other languages, versions and see details Hide selection and details

	EN
31/01/2025
02/12/2024

Language:	English
Version:	31/01/2025
File size:	1.9 MB
File name:	TI01801TEN_0225-00.pdf

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Operating Instruction (BA)

BA iTHERM SurfaceLine TM611

Operating Instruction (BA)

English version - 01/2025

New version available in English

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

Select other languages, versions and see details Hide selection and details

	EN
31/01/2025
02/12/2024

Language:	English
Version:	31/01/2025
File size:	2.1 MB
File name:	BA02366TEN_0225-00.pdf

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Short Instruction (KA)

KA iTHERM SurfaceLine TM611

Short Instruction (KA)

English version - 12/2024

New version available in English

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

Select other languages, versions and see details Hide selection and details

	EN
02/12/2024

Language:	English
Version:	02/12/2024
File size:	690.7 KB
File name:	KA01716TEN_0124-00.pdf

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Ex Safety Instruction (XA)

XA iTHERM SurfaceLine TM611

Ex Safety Instruction (XA)

English version - 01/2024

New version available in English

ATEX, IECEx:
Ex db IIC T6 Gb
Ex tb IIIC Txxx °C Db

Select other languages, versions and see details Hide selection and details

	EN
24/01/2024

Language:	English
Version:	24/01/2024
File size:	460.1 KB
File name:	XA03258TEN_0124-00.pdf

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Ex Safety Instruction (XA)

XA iTHERM SurfaceLine TM611

Ex Safety Instruction (XA)

English version - 01/2024

New version available in English

ATEX, IECEx:
Ex ia IIC T6 Ga/Gb
Ex ia IIIC Txxx °C Da/Db

Select other languages, versions and see details Hide selection and details

	EN
29/01/2024

Language:	English
Version:	29/01/2024
File size:	430.2 KB
File name:	XA03256TEN_0124-00.pdf

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Ex Safety Instruction (XA)

XA iTHERM SurfaceLine TM611

Ex Safety Instruction (XA)

English version - 07/2025

New version available in English

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

Select other languages, versions and see details Hide selection and details

	EN
28/07/2025

Language:	English
Version:	28/07/2025
File size:	428.5 KB
File name:	XA03592TEN_0125-00.pdf

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Ex Safety Instruction (XA)

iTHERM TM111, TM131 Control drawing CSA IS, NI, DIP

Ex Safety Instruction (XA)

English version - 09/2024

New version available in English

Thermometer
Installation Notes for hazardous locations
Intrinsically safe, Nonincendive, Dust ignition proof

Show details Hide details

Language:	English
Version:	17/09/2024
File size:	449.6 KB
File name:	XA01976TEN_05.24.pdf

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Ex Safety Instruction (XA)

TM111, TM131, TM611: cCSAus XP DIP NI

Ex Safety Instruction (XA)

English version - 01/2025

New version available in English

TM111, TM131: cCSAus XP DIP NI

Show details Hide details

Language:	English
Version:	27/01/2025
File size:	1.7 MB
File name:	XA01961T_04.25.pdf

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iTHERM SurfaceLine TM611Surface thermometer

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

Specs at a glance

Accuracy

Response time

Operating temperature range

Field of application

Benefits

Videos

Extended selection

Success stories

Innovative non-invasive temperature measurement for hydrogen

Optimized temperature control in steam power plants

Boost heat exchanger efficiency and safety

Temperature measurement in hydrogen production

Precise and durable temperature control in preheaters

Could also interest you

eBrochure iTHERM SurfaceLine TM611

Redefining non-invasive temperature measurement!

Measuring principle

Characteristic / Application

Thermowell / protection tube

Insert / probe

Outer diameter protection tube / Insert

Process connection

Operating temperature range

Accuracy

Response time

Integration head transmitter

Ex - approvals

Certification

Back

TI iTHERM SurfaceLine TM611

BA iTHERM SurfaceLine TM611

KA iTHERM SurfaceLine TM611

XA iTHERM SurfaceLine TM611

XA iTHERM SurfaceLine TM611

XA iTHERM SurfaceLine TM611

iTHERM TM111, TM131 Control drawing CSA IS, NI, DIP

TM111, TM131, TM611: cCSAus XP DIP NI

Back

Terminal Head TA30A

Terminal Head TA30D

Terminal Head TA30EB

Terminal Head TA30P

Terminal Head TA30R

Spare parts kit sealing TA30A/TA30D

Spare Parts Kit Cover TA30R

Spare parts kit ring D21/di 10xgreen

iTEMP TMT31, Transmitter 4-20mA

iTEMP TMT36, Transmitter IO-Link

iTEMP TMT71, Transmitter 4-20mA

iTEMP TMT72, Transmitter HART

iTEMP TMT82, Transmitter HART

iTEMP TMT84, Transmitter PA

iTEMP TMT85, Transmitter FF

iTEMP TMT86, Ethernet Transmitter

Fixing kit cpl. TMT8x/7x (european)

Commubox FXA291 (Hardware)

Commubox FXA195

Configuration Kit TXU10

FieldPort SFP20

M12 cable for FieldPort SFP20

Temperature ceramic block 3 pole

Temperature ceramic block 4 pole

Temperature ceramic block 6 pole

Mounting kit TM611 (DN8-DN25), small

Mounting kit TM611 (DN40-DN80), small

Mounting kit TM611 (DN100-DN150), small

Mounting kit TM611 (DN8-DN25), large

Mounting kit TM611 (DN40-DN80), large

Mounting kit TM611 (DN100-DN150), large

Plug for Thermometer + Transmitter

Cable gland NPT1/2, D4.5-8.5 IP68

Screwed cable gland set 2x M20x1.5 IP68

Accuracy

Accuracy

Output

Display

Input

iTHERM SurfaceLine TM611
Surface thermometer