 
                  Specs at a glance
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                              Accuracydepending 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
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                              Response timedepending 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) 
Videos
Extended selection
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        High-end products 
- Highly functional and convenient
Technical excellence
Simplicity
 
                              - 
        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 | 
|---|---|---|
| 
 Fundamental selection Meet your basic measurement needs | Technical excellence | Simplicity | 
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 Lean selection Handle your core processes easily | Technical excellence | Simplicity | 
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 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 TM611English version - 01/2025 Surface thermometer Non-invasive RTD/TC thermometer with high measurement performance for demanding applications EN 31/01/202502/12/2024Language: English Version: 31/01/2025 File size: 1.9 MB File name: TI01801TEN_0225-00.pdf 
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                                                            Technical Information (TI)
 TI iTHERM SurfaceLine TM611Surface thermometer 
 Non-invasive RTD/TC thermometer with high measurement performance for demanding applicationsEN 31/01/202502/12/2024Language: 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 TM611Surface thermometer 
 Non-invasive RTD/TC thermometer with high measurement performance for demanding applicationsEN 31/01/202502/12/2024Language: 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 TM611Surface thermometer 
 Non-invasive RTD/TC thermometer with high measurement performance for
 demanding applicationsEN 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 TM611ATEX, IECEx: 
 Ex db IIC T6 Gb
 Ex tb IIIC Txxx °C DbEN 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)
 XA iTHERM SurfaceLine TM611ATEX, IECEx: 
 Ex ia IIC T6 Ga/Gb
 Ex ia IIIC Txxx °C Da/DbEN 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 TM611Ex 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 DbEN 28/07/2025Language: 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, DIPThermometer 
 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 NITM111, 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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                                                            Ex Safety Instruction (XA)
 XA iTHERM SurfaceLine TM6110Ex 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 ХEN 22/10/2025Language: English Version: 22/10/2025 File size: 429.3 KB File name: XA03660TEN_0125-00.pdf 
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                                                            Ex Safety Instruction (XA)
 XA iTHERM SurfaceLine TM6111Ex d IIC T6...T1 Gb X 
 Ex tb IIIC T85°C…T450°C Db XEN 29/10/2025Language: English Version: 29/10/2025 File size: 459.6 KB File name: XA03661TEN_0125-00.pdf 
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