
Specs at a glance
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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
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Operating temperature range
-196 °C…400 °C (-320,8 °F...752 °F)
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)
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
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Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
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Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
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Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
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Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
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Technical Information (TI)
TI iTHERM SurfaceLine TM611
English version - 12/2024
Surface thermometer Non-invasive RTD/TC thermometer with high measurement performance for demanding applications
EN More 02/12/2024Language:
English
Version:
02/12/2024
File size:
1.8 MB
File name:
TI01801TEN_0124-00.pdf
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AI (Application note)
Innovative non-invasive temperature measurement for hydrogen pipes
English version - 01/2025
The right solution for small pipe dimensions
Language:
English
Version:
22/01/2025
File size:
382 KB
File name:
AI01401T0EN01.25.pdf
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Technical Information (TI)
TI iTHERM SurfaceLine TM611
Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for
demanding applicationsEN Select other language 02/12/2024Language:
English
Version:
02/12/2024
File size:
1.8 MB
File name:
TI01801TEN_0124-00.pdf
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Operating Instruction (BA)
BA iTHERM SurfaceLine TM611
Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for
demanding applicationsEN Select other language 02/12/2024Language:
English
Version:
02/12/2024
File size:
2 MB
File name:
BA02366TEN_0124-00.pdf
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Short Instruction (KA)
KA iTHERM SurfaceLine TM611
Surface thermometer
Non-invasive RTD/TC thermometer with high measurement performance for
demanding applicationsEN Select other language 02/12/2024Language:
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
ATEX, IECEx:
Ex ia IIC T6 Ga/Gb
Ex ia IIIC Txxx °C Da/DbEN Select other language 29/01/2024Language:
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
ATEX, IECEx:
Ex db IIC T6 Gb
Ex tb IIIC Txxx °C DbEN Select other language 24/01/2024Language:
English
Version:
24/01/2024
File size:
460.1 KB
File name:
XA03258TEN_0124-00.pdf
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Ex Safety Instruction (XA)
iTHERM TM111, TM131 Control drawing CSA IS, NI, DIP
Thermometer
Installation Notes for hazardous locations
Intrinsically safe, Nonincendive, Dust ignition proofLanguage:
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
TM111, TM131: cCSAus XP DIP NI
Language:
English
Version:
27/01/2025
File size:
1.7 MB
File name:
XA01961T_04.25.pdf
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Functional Safety (FY)
FY iTHERM ModuLine TM1x1, iTHERM SurfaceLine TM611
EN Select other language 21/06/202424/04/2023Language:
English
Version:
21/06/2024
File size:
2.6 MB
File name:
FY01102TEN_0224-00.pdf
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Innovation (IN)
Nicht-invasive Temperaturmessung neu definiert!
Die Alternative für raue Prozessbedingungen:
iTHERM SurfaceLine TM611Language:
German
Version:
27/02/2025
File size:
18.8 MB
File name:
IN01424T_09_DE iTHERM SurfaceLine TM611.pdf
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Innovation (IN)
Redefining non-invasive temperature measurement!
The alternative for harsh process conditions:
iTHERM SurfaceLine TM611Language:
English
Version:
24/02/2025
File size:
18.6 MB
File name:
IN01424T_09 iTHERM SurfaceLine TM611.pdf
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AI (Application note)
Optimized temperature control in steam power plants
Efficient stand-by operation of a turboset
Language:
English
Version:
25/02/2025
File size:
653 KB
File name:
AI01414T09EN01.25.pdf
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AI (Application note)
Optimierte Temperaturregelung in Dampfkraftwerken
Effizienter Stand-By-Betrieb eines Turbosatzes
Language:
German
Version:
25/02/2025
File size:
611.3 KB
File name:
AI01414T09DE01.25.pdf
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AI (Application note)
Innovative nicht-invasive Temperaturmessung für Wasserstoffleitungen
Die richtige Lösung für kleine Rohrdurchmesser
Language:
German
Version:
22/01/2025
File size:
312.2 KB
File name:
AI01401T09DE01.25.pdf
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AI (Application note)
Boost heat exchanger efficiency and safety
accurate non-invasive temperature measurement
Language:
English
Version:
14/02/2025
File size:
777 KB
File name:
AI01410T09EN01.25.pdf
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AI (Application note)
Innovative non-invasive temperature measurement for hydrogen pipes
The right solution for small pipe dimensions
Language:
English
Version:
22/01/2025
File size:
382 KB
File name:
AI01401T0EN01.25.pdf
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AI (Application note)
Gesteigerte Effizienz und Sicherheit von Wärmetauschern
durch genaue, nicht-invasive Temperaturmessung
Language:
German
Version:
14/02/2025
File size:
787.1 KB
File name:
AI01410T09DE01.25.pdf
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Manufacturer Declaration
Product family: Process RTD general purpose
Product root: TM611-
Declaration number: HE_02051_01.25
Manufacturer specification: RoHS
Additional information: China RoHSEN Select other language 15/01/2025Language:
English
Version:
15/01/2025
File size:
158 KB
File name:
HE_02051_01.25 China RoHS TM611.pdf
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EU Declaration
Product family: Process RTD general purpose
Product root: TM611-
Declaration number: EU_01229_01.24EN Select other language 13/09/2024Language:
English
Version:
13/09/2024
File size:
1.4 MB
File name:
EC_01229_01.24.pdf
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EU Declaration
Product family: Accessories: RTD insert, Accessories: TC insert, Accessories: Inserts, Process RTD direct contact, Process RTD gener al purpose, Process RTD heavy duty, Process RTD hygienic, Process TC direct contact, Process TC direct in contact, Process TC genera l purpose, Process TC heavy duty
Product root: TC10-, TC12-, TC13-, TC15-, TC61-, TC62-, TC63-, TC65-, TC66-, TC88-, TEC420-, TM111-, TM131-, TM151-, TM411-, TM412-,
TM611-, TPC100-, TPR100-, TR10-, TR11-, TR12-, TR13-, TR15-, TR24-, TR61-, TR62-, TR63-, TR65-, TR66-, TR88-, TS111-, TSC310-, TST3
10-
Declaration number: EC_00169_05.25EN Select other language 10/03/2025Language:
English
Version:
10/03/2025
File size:
1.4 MB
File name:
EC_00169_05.25.pdf
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EU Declaration
Product family: Low cost RTD general purpose, Process RTD direct contact, Process RTD direct in contact, Process RTD general purpose , Process RTD heavy duty, Process RTD hygienic, Process TC direct contact, Process TC direct in contact, Process TC general purpose, Process TC heavy duty, RTD thermometer, TC heavy duty
Product root: TAF11-, TAF12D-, TAF12S-, TAF12T-, TAF16-, TC10-, TC12-, TC13-, TC15-, TC61-, TC62-, TC63-, TC65-, TC66-, TC88-, TEC42
0-, TH11-, TH12-, TH13-, TH14-, TH15-, TH17-, TH18-, TH27-, TH51-, TH52-, TH53-, TH54-, TH55-, TH56-, TM101-, TM111-, TM112-, TM121-
, TM131-, TM151-, TM152-, TM401-, TM402-, TM411-, TM412-, TM611-, TMT142C-, TMT142R-, TMT162C-, TMT162R-, TR10-, TR11-, TR12-, TR13-
, TR15-, TR24-, TR25-, TR44-, TR45-, TR46-, TR47-, TR48-, TR61-, TR62-, TR63-, TR65-, TR66-, TR88-, TSC310-, TSM187-, TSM487-, TST18
7-, TST310-, TST40N-, TST410-, TST414-, TST41N-, TST434-, TST434B-, TST487-, TST602-, TST90-
Declaration number: EC_00136_04.24EN Select other language 20/02/2024Language:
English
Version:
20/02/2024
File size:
150.6 KB
File name:
EC_00136_04.24.pdf
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