Temperature measurement

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Temperature transmitters Industrial thermometers Thermowells High temperature thermometers Hygienic thermometers Compact thermometers Temperature switches Surface thermometers Cable probes Multipoint thermometers

Intrinsically safe temperature sensor – iTHERM ModuLine TM131

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Designed for demanding applications

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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

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iTHERM ModuLine TM131 Industrial modular thermometer

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

Accuracy 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 fastest response time with thermowell t90 starting at below 10 s
depending on configuration

Max. process pressure (static) depending on the configuration up to 100 bar

Operating temperature range PT100 TF iTHERM StrongSens:
-50 °C ...500 °C
(-58 °F ...932 °F)
PT100 TF iTHERM QuickSens:
-50 °C …200 °C
(-58 °F …392 °F)
PT100 WW:
-200 °C ...600 °C
(-328 °F ...1.112 °F)
PT100 TF:
-50 °C ...400 °C
(-58 °F ...752 °F)
Typ K:
max. 1.100 °C
(max. 2.012 °F)
Typ J:
max. 800 °C
(max. 1.472 °F)
Typ N:
max. 1.100 °C
(max. 2.012 °F)

Max. immersion length on request up to 4.500,0 mm (177'')

iTEMP TMT82 temperature transmitter with HART® communication

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iTEMP TMT82 temperature transmitter

HART® temperature transmitter as head, field or DIN rail device with two universal sensor inputs suitable for use in hazardous areas and SIL 2

Accuracy (Pt100, -50...200 °C) <= 0,1 K
(Pt100, -58...392 °F) <= 0,18 °F

High-temperature thermocouple thermometer - TAF16

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iTHERM FlameLine TAF16 High temperature thermometer

Metric TC thermometer with metal or alloy thermowell for high-temperature applications

Accuracy class 2 acc. to IEC 60584

Max. process pressure (static) at 20 °C: 1 bar (15 psi)

Operating temperature range Type K:
-40 °C ...1.100 °C
(-40 °F ...2.012 °F)
Type J:
-40 °C ...750 °C
(-40 °F ...1.382 °F)
Type N:
-40 °C ...1.150 °C
(-40 °F ...2102 °F)
Type S:
0 °C ...1.400 °C
(32 °F ...2.552 °F)

Max. immersion length on request up to 4.525,00 mm (178,15'')

Explosion proof temperature sensor iTHERM ModuLine TM111

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iTHERM ModuLine TM111 Industrial modular thermometer

Metric RTD/TC direct contact thermometer for a wide range of industrial applications

Accuracy 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 t90 starting at < 1,5 s iTHERM QuickSens
depending on configuration

Max. process pressure (static) depending on the configuration

Max. immersion length on request up to 4.500,0 mm (177'')

Imperial temperature sensor without thermowell

New

Not available

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iTHERM ModuLine TM112 Industrial modular thermometer

Not available

Imperial RTD/TC direct contact thermometer for a wide range of industrial applications

Accuracy 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 t90 starting at < 1,5 s iTHERM QuickSens
depending on configuration

Max. process pressure (static) depending on the configuration

Operating temperature range PT100 TF iTHERM StrongSens:
-50 °C ...500 °C
(-58 °F ...932 °F)
PT100 TF iTHERM QuickSens:
-50 °C …200 °C
(-58 °F …392 °F)
PT100 WW:
-200 °C ...600 °C
(-328 °F ...1.112 °F)
PT100 basic TF:
-50 °C ...200 °C
(-58 °F ...392 °F)
Typ K:
max. 1.100 °C
(max. 2.012 °F)
Typ J:
max. 800 °C
(max. 1.472 °F)
Typ N:
max. 1.100 °C
(max. 2.012 °F)

Max. immersion length on request up to 180"

Modular TC or RTD industrial thermometer

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iTHERM ModuLine TM151 Industrial modular thermometer

Metric RTD/TC thermometer with barstock thermowell for a wide range of industrial applications

Accuracy 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 configuration

Max. process pressure (static) depending on the configuration up to 500 bar

Max. immersion length on request up to 1.500,0 mm (59,06'')

New

Not available

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iTHERM ModuLine TM152 Industrial modular thermometer

Not available

Imperial RTD/TC thermometer with barstock thermowell for a wide range of industrial applications

Accuracy 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 configuration

Max. process pressure (static) depending on the configuration up to 500 bar

Operating temperature range PT100 TF iTHERM StrongSens:
-50 °C ...500 °C
(-58 °F ...932 °F)
PT100 TF iTHERM QuickSens:
-50 °C …200 °C
(-58 °F …392 °F)
PT100 WW:
-200 °C ...600 °C
(-328 °F ...1.112 °F)
PT100 basic TF:
-50 °C ...200 °C
(-58 °F ...392 °F)
Typ K:
max. 1.100 °C
(max. 2.012 °F)
Typ J:
max. 800 °C
(max. 1.472 °F)
Typ N:
max. 1.100 °C
(max. 2.012 °F)

Max. immersion length on request 84"

Pt100 temperature sensor - iTHERM CompactLine TM311

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iTHERM CompactLine TM311 Compact thermometer

Metric/imperial RTD 4-20 mA/IO-Link compact thermometer for industrial and hygienic applications

Accuracy class A acc. to IEC 60751

Response time t50 = 1 s
t90 = 1.5 s

Max. process pressure (static) at 20 °C: 50 bar (725 psi)

Operating temperature range PT 100:
-50 °C ...200 °C
(-58 °F ...392 °F)

Max. immersion length on request up to 600,00 mm (23,62'')

Compact sanitary RTD - iTHERM TrustSens TM371

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iTHERM TrustSens TM371 Compact thermometer

Metric RTD thermometer with self-calibration technology for hygienic applications

Response time t50 = 2.5 s
t90 = 5.4 s

Max. process pressure (static) at 20 °C: 40 bar (580 psi)

Operating temperature range Pt100:
-40 °C to 160 °C (-40 °F to 320 °F),
optional up to 190 °C (374 °F)
reference point for automated calibration

Max. immersion length on request up to 900.00 mm (35.4'')

iTHERM TrustSens TM372 Hygienic compact thermometer, US Style

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iTHERM TrustSens TM372 Compact thermometer

Imperial RTD thermometer with self-calibration technology for hygienic applications

Response time t50 = 2,5 s
t90 =9,5s

Max. process pressure (static) at 20 °C: 40 bar (580 psi)

Operating temperature range PT 100:
-40 °C …160 °C (-40 °F …320 °F),
optional up to 190 °C (374 °F)

Max. immersion length on request up to 28'' (711 mm)
others on request

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Instrumentation for temperature measurement

Endress+Hauser offers a complete assortment of temperature sensors, thermometers and their components such as thermowells with a huge variety of process connections and neck/lagging versions, terminal heads, transmitters, measurement inserts and further accessories for all types of process industries.

Thermometers & temperature transmitters

Our expansive portfolio offers globally available, standardized thermometers to measure temperature in industrial and hygienic applications across all process industries. We enhance plant availability, efficiency and safety through outstanding customer-centric innovations. Our internationally tested and certified products ensure seamless integration, ease of use and long-term reliable performance.

In combination with Endress+Hauser transmitters, our temperature assemblies are the perfect fit for all industries and a wide range of applications. Different housing types, various digital and analog output signals, approvals and more ensure an optimal selection and make the thermometers suitable for a wide range of control systems.

Benefits

Plant safety and trouble-free plant certification: International approvals for metrology, hazardous areas, safety and more
Seamless system integration: All common protocols - from analog to digital outputs
Low operating costs: Easy handling from installation to maintenance, long lifetime
Enhanced efficiency and safety: Outstanding measurement performance, broad certification, customer-centric innovations
High plant productivity and availability: Reliable, accurate sensor technology and traceable, accredited calibrations
Worldwide availability: From instrumentation to support, services and solutions

Learn more about temperature sensors and the measuring principles

What is a thermometer and what is special about thermometers used in process automation?

A thermometer is an instrument that measures temperature. Temperature measurement is a fundamental aspect of science and daily life, from cooking to weather forecasts. It is the most frequently measured parameter in the process industry and highly relevant for process safety, efficiency and the quality of the final products.

Temperature sensors and their measurement data are the decisive factor in a large number of industrial processes, therefore the devices need to be reliable and accurate. Standard instruments to measure temperature in our everyday life are not comparable to industrial temperature sensors for several reasons.

Infrared thermometers measure temperature from a distance by detecting infrared radiation emitted by objects. Factors such as material and surface properties influence the emissivity and therefore the accuracy of this measurement. This may cause inaccuracies in harsh and changing conditions. Moreover, in industrial processes, the variable to be measured is typically the temperature of the medium in a pipe or container and not the surface temperature, which is detected by the infrared measurement.
Household thermometers often contain a liquid in a narrow glass tube that expands when heated and hereby indicates temperature changes. Mercury is one of the most familiar materials used in liquid thermometers. The fragile materials and high contamination risk make them unsuitable for harsh and often high-pressure industrial environments.
Electronic thermometers with digital displays are widely used in portable devices or for measuring room temperature. They can monitor body temperature and ambient temperature, providing data for health monitoring and environmental awareness. They are cost-effective and compact but do not fulfill the requirements for industrial use in terms of accuracy, robustness and long-term stability.

For these reasons RTD (Resistance Temperature Detector) or thermocouple sensors are preferred in industrial processes. These are designed to precisely and reliably measure temperature within pipes or tanks in harsh process conditions.

What are the different units for temperature measurement?

The three most common units for temperature monitoring are Celsius, Fahrenheit, and Kelvin. The Celsius scale is part of the metric system, while Fahrenheit is part of the imperial system. To convert Celsius to Fahrenheit, multiply the Celsius temperature by 1.8 and then add 32. For example: The boiling point of water is 100 degrees Celsius and 212 degrees Fahrenheit. The Kelvin scale does not use degrees; it uses the kelvin (K) as a unit of measurement. The Celsius and Fahrenheit scale are most used for temperature measurement, while the Kelvin scale is often used in scientific research or indication of temperature differences.

Which types of process instrumentation to measure temperature exist?

Invasive (direct contact)

In pipes or containers, the fastest and most accurate measurement can usually be achieved with a direct immersion thermometer without a protective tube (thermowell). However, this is not feasible in many applications and has various disadvantages. For example, to remove or replace the thermometer, the process must be shut down and the pipe may need to be drained. In addition, direct installation carries the risk of contamination and rapid wear, especially if the thermometer is exposed to harsh process conditions such as corrosive or abrasive media.

Invasive (with thermowell)

An invasive measurement with a thermowell offers the possibility of exchanging the temperature sensor without interrupting the process. In addition, if the protective tube material and geometry are selected to suit the process, the thermometer can have a very long service life. However, thermowells disrupt the process flow, lead to a pressure loss in the pipeline and are also subject to wear, which can require regular maintenance and, if necessary, the replacement of protective tubes, especially in critical applications. The use of protective tubes typically reduces the response time of a thermometer compared to direct contact thermometers.

Non-invasive (surface measurement)

New thermometric techniques have been developed that allow monitoring of process temperature without inserting a sensor into the process medium. These non-invasive temperature sensors are mounted on the surface of the pipe or vessel. Intelligent design and advanced technologies ensure optimum heat flow to the sensor element, which minimizes the measurement error and uncertainty. Since these temperature sensors do not penetrate the pipe wall, typical problems as leakage, wear or negative effects on the process can be avoided. Non-invasive thermometers are easy to install, can be retrofitted and are almost maintenance-free. However, external factors such as the ambient temperature and surface conditions can the impact measurement accuracy. For this reason, thermal insulation of the measuring point is recommended for most applications.

What are the components of a temperature assembly?

The insert is located in the thermowell, with the thermowell being the process wetted component of the assembly. It increases the lifetime of the measurement insert by protecting it against harsh process conditions (corrosion, abrasion, process pressure etc.) and allows to exchange the measurement insert without process interruption.

The tip of the measurement insert contains the temperature sensor element, the most important component, as it provides precise and reliable measurement data through an electrical signal.

In order to transmit the raw signal towards the process control system, it is necessary to convert it into a standardized analog or digital signal. This conversion is the task of the transmitter - it acts as a smart interface between the sensor and the PLC. It offers enhanced accuracy and signal stability, reduced wiring costs and advanced diagnostic functions.

The transmitter is placed in the terminal head, which is fitted to the thermowell or the neck of the thermometer. It protects the transmitter and acts as a junction box for wiring all different components. Some terminal heads also provide a local display for indication of measurement values and status information.

Other components are the process connection, the connection between the process and the thermometer, and the extension neck, the connection between the terminal head and process connection/thermowell. The neck protects the head transmitter from overheating by creating a distance to the often hot process temperatures. It also guarantees access to the terminal head in the case of pipe insulation.

What are the most common types of temperature sensors used in industrial applications? What’s the difference between thermocouples and resistance temperature detectors?

Both RTD and TC are widely used in industrial applications to measure temperature. Choosing between thermocouple and resistance temperature detector depends on the specific requirements of the application including temperature range, accuracy, environmental conditions, and budget.

RTDs excel in accuracy, linear response, long-term stability, and resistance to electrical noise, making them ideal for precisely and reliably measuring temperature in controlled environments.

Thermocouples are advantageous for their wide temperature range, durability, fast response time, and cost-effectiveness, making them suitable for extreme industrial conditions and high-temperature applications.

Most methods for monitoring temperature rely on physical properties of materials that vary with temperature. Temperature can be measured by examining changes in physical properties e.g. electrical resistance or voltage. Industrial temperature sensors typically use two types of measurement principles:

1. Resistance Temperature Detector (RTD)

Negative Temperature Coefficient (NTC): These sensors exhibit higher resistance at low temperatures and lower resistance at higher temperatures. / Positive Temperature Coefficient (PTC): These sensors exhibit lower resistance at low temperatures and higher resistance at higher temperatures.

In industrial processes, resistance temperature sensors are most common. An RTD is typically made of high-purity metals. The temperature sensor typically consists of a length of wire made from pure metals such as platinum, nickel, or copper. The electrical resistance of the sensor metal increases as the temperature rises. This change in resistance is measured and converted into temperature readings. Resistance thermometers in industrial processes typically use a platinum sensor, either a Pt100 or Pt1000 temperature sensor. These sensors are standardized e.g. according to IEC 60751. The Pt100 temperature sensor is a temperature-sensitive platinum resistor with a resistance of 100 Ω at 0 °C (32 °F) and a temperature coefficient α = 0.003851 °C-1

2. Thermocouples (TC)

Thermocouples are comparatively simple, robust temperature sensors which use the Seebeck effect for temperature measurement. If two electrical conductors made of different materials are connected at a point, a weak electrical voltage can be measured between the two open conductor ends if the conductors are subjected to a thermal gradient. This voltage is called thermoelectric voltage or electromotive force (emf). Its magnitude depends on the type of conducting materials and the temperature difference between the "measuring point" (the junction of the two conductors) and the "cold junction" (the open conductor ends). Accordingly, thermocouples primarily only measure differences in temperature. The absolute temperature at the measuring point can be determined from these if the associated temperature at the cold junction is known or is measured separately and compensated for. The material combinations and associated thermoelectric voltage/temperature characteristics of the most common types of thermocouple are standardized in the IEC 60584 and ASTM E230/ANSI MC96.1 standards.

What are the different types of resistance temperature detectors?

Thin-film platinum resistance thermometers (TF): A very thin, ultrapure platinum layer, approx. 1 μm thick, is vaporized in a vacuum on a ceramic substrate and then structured photolithographically. The platinum conductor paths formed in this way create the measuring resistance. Additional covering and passivation layers are applied and reliably protect the thin platinum layer from contamination and oxidation, even at high temperatures. The primary advantages of thin-film temperature sensors over wire-wound versions are their smaller sizes and better vibration resistance. A relatively low principle-based deviation of the resistance/temperature characteristic from the standard characteristic of IEC 60751 can frequently be observed among TF sensors at high temperatures. As a result, the tight limit values of tolerance class A as per IEC 60751 can only be observed with TF sensors at temperatures up to approx. 300 °C (572 °F).
Wire-wound (WW): In these thermometers, a double coil of fine, high-purity platinum wire is accommodated in a ceramic support. This support is then sealed top and bottom with a ceramic protective layer. Such resistance thermometers not only facilitate very repeatable measurements but also offer good long-term stability of the resistance/temperature characteristic within temperature ranges up to 600 °C (1112 °F). This type of sensor is relatively large in size and comparatively sensitive to vibrations.

Why should I use a temperature transmitter instead of direct wiring?

Using a transmitter offers several advantages over direct wiring. While direct wiring simply transmits the raw sensor signal, a transmitter enables communication through various analog and digital protocols such as Profinet (via Ethernet-APL) or IO-Link. This allows seamless integration into the plant’s digital communication infrastructure. Bluetooth-enabled transmitters even allow for particularly easy configuration and remote control.

Transmitters provide more than just the measured value. They can deliver additional diagnostic and status information, enhancing process reliability. Furthermore, transmitters can "smartify" the thermometer or measurement point, turning them into intelligent nodes within the system. This not only improves data quality and accessibility but also supports predictive maintenance and efficient process control.

Which factors can affect the accuracy of temperature measurements in industrial environments? How can the accuracy of an industrial thermometer be increased?

The accuracy of temperature sensors depends on several factors:

Sensor accuracy: temperature sensors have standardized accuracy classes according e.g. IEC60751 or IEC60584. Platinum RTDs (resistance temperature detector) typically offer more accurate temperature measurement compared to TCs (thermocouples).

Temperature transmitter accuracy: the performance characteristics of the transmitter have a direct influence on the overall accuracy of the thermometer.

Installation conditions and thermometer design: correct and smart design of the measurement point and temperature sensor has the biggest influence on overall measurement performance and accuracy. Properties like immersion length, thermal masses, thermal conduction and coupling, thermal insulation from ambient conditions, material properties and more are to be considered and wisely orchestrated.

Suitable design and technology is vital for achieving best possible measurement performance. If not done correctly, even the most sophisticated sensor or transmitter technology cannot achieve good results. Often too little attention is paid to installation conditions and thermometer design. Endress+Hauser can help you to design your measurement point optimally.

Sensor-transmitter-matching by Endress+Hauser offers additional reduction of the thermometer measurement uncertainty. It ensures the highest accuracy when ordering a thermometer including a transmitter. With an in-house calibration, the individual sensor characteristic curve is determined and stored in the transmitter via the Callendar-Van Dusen coefficients. In this way, sensor and transmitter are optimally tuned and measurement deviations are reduced to a minimum.

What is a calibration and how often should industrial temperature sensors be calibrated?

A calibration is the process of verifying the accuracy of the measurement device (thermometer) by comparing its readings to a known standard or reference. This ensures that the device accurately and reliably measures temperature within defined tolerances.

Temperature is a crucial parameter for many processes determining product and plant safety as well as process efficiency. To ensure long-term stability and safety, regular calibration (recalibration) is necessary. The frequency of recalibration intervalls should be determined depending on the temperature sensor type, the process conditons, the criticality of the temperature measurement point and imposed risks arising from deviations. The frequency of recalibration is usually determined by balancing effort and risk based on experience and knowledge.

A clever and unique option is the Endress+Hauser self-calibrating compact thermometer iTHERM TrustSens. It reduces risks and costs by a fully automated, traceable inline self-calibration. The hygienic thermometer makes use of the Curie effect, having a built-in, long-term stable fix point reference with complete traceability of the calibration chain according to ITS-90.

How do I choose the right temperature sensor for my industrial process?

Consider your application and process data to make the right choice. Most important factors are process temperature range, required measurement performance such as accuracy & response time, installation and environmental conditions. The selection and configuraton of each thermometer (e.g. invasive vs. non-invasive, direct contact vs. thermowell, resistance temperature detector vs. thermocouple, transmitter model and communication protocol, necessary approvals such as hazardous areas or SIL requirements, type of process connection and all other components) depends on these factors.

Endress+Hauser offers a complete and highly flexible range of thermometers for measuring temperature, as well as components that ensure the best possible measurement solution for any industrial application in process automation.

Industrial thermometers: General-purpose thermometers are used in industrial processes that do not require strict hygiene or sterility. The wide range of configurations makes them suitable for demanding applications in the oil & gas industry or in auxiliary circuits. They are available with various certifications as required such as Ex approvals (ATEX, IEC, NEPSI, INMETRO, CSA, FM, ...), marine approvals (BV, GL, LR, DNV, KR, ..) and pressure directives (e.g. CRN).

Hygienic thermometers: These temperature sensors are suitable for sterile and aseptic applications, as they can be supplied with hygienic process connections and corresponding international certificates and approvals such as EHEDG, 3-A, ASME BPE, cGMP, Food Contact Material (EG) 1935/2004 / FDA DFR21 / GB4806.

Compact thermometers combine temperature sensor and transmitter into a single, non-dismantable assembly. They are small, light and offer process connections for industrial or hygienic use. Their design requires replacement of the entire unit in the event of failure, rather than replacement of individual components.

Multipoint thermometers are used to measure temperature at multiple points simultaneously for temperature profiling with more than one temperature sensor. They are suitable for critical applications involving high temperatures, high pressures or corrosive media e.g. in the oil & gas and petrochemical industry, or for use in tanks or silos e.g. in the food & agriculture industry.

High temperature sensors include innovative thermowell materials such as non-porous ceramics with improved wear and chemical resistance. The thermocouple sensors can measure temperature in applications up to +1700 °C (+3092 °F) in furnaces or melts e.g. in the metal industry, waste incinerators, cement production or glass industry.

Surface or non-invasive temperature sensors are used to measure the process or pipe temperature by only touching the outer surface of the pipe (or vessel). They reduce the risk of leakage and prevent flow problems in small pipes, in pipes that require pigging, and in highly corrosive or abrasive applications.

Cable probe temperature sensors are available with plug-in or screw-in connection and are equipped with a non-detachable, flexible cable. The probe sheath is in direct contact with the process medium, providing fast and accurate detection of rapid temperature changes. Cable probes are typically used in machinery, HVAC systems, laboratory equipment, and plants with gaseous or liquid media.

Using the Endress+Hauser product configurator helps you create a thermometer to measure temperature in your process, deciding on the version of every single component. All components to measure temperature such as thermowell, transmitter, terminal head, process connection, neck/lagging, measurement insert, temperature sensors and further accessories are available from Endress+Hauser.

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.

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Temperature measurement for the process industry

Temperature Measurement - Thermometers and transmitters for the process industry

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Instrumentation for temperature measurement

Thermometers & temperature transmitters

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Learn more about temperature sensors and the measuring principles

Redefining non-invasive temperature measurement!

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Instrumentation for temperature measurement

Thermometers & temperature transmitters

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Learn more about temperature sensors and the measuring principles

Redefining non-invasive temperature measurement!

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