A Modular Industrial Thermometer for Process Applications
The iTHERM ModuLine TM151 is designed as a configurable temperature assembly rather than a fixed sensor with one standard construction. The thermometer can be assembled from different sensing elements, protection tubes or thermowells, process connections, terminal heads and optional temperature transmitters.
This modular approach allows the same product family to cover both basic temperature measurement and more demanding industrial applications. Endress+Hauser positions the TM151 for use across industries including Power & Energy, Chemical, Oil & Gas and utility applications.
RTD and Thermocouple Measurement
The TM151 supports both major industrial temperature sensing principles.
RTD configurations include PT100, with available versions such as iTHERM StrongSens, iTHERM QuickSens and standard PT100 designs. Thermocouple configurations include Type K, Type J and Type N, allowing the sensor technology to be selected according to the required temperature range and application.
Wide Temperature Capability
The available operating temperature depends on the selected sensor technology. Endress+Hauser specifies:
- PT100 iTHERM StrongSens: up to 500°C
- PT100 iTHERM QuickSens: up to 200°C
- PT100 WW: -200 to 600°C
- PT100 TF: -50 to 400°C
- Type K: up to 1100°C
- Type J: up to 800°C
- Type N: up to 1100°C
This broad configuration range allows the TM151 to cover both conventional process temperature measurement and high-temperature applications.
Flexible Thermowell and Protection Tube Design
The TM151 can be supplied with a barstock thermowell/protection tube or configured for installation into an existing thermowell. Available materials include 316/316L stainless steel, 316Ti, 347, 310, Alloy 600, Alloy C276, titanium and several process-grade steels, depending on the selected configuration.
This makes the thermometer adaptable to different process media, temperatures, pressures and mechanical requirements.
Multiple Process Connection Options
A wide range of process connections is available, including G1", NPT, metric threads and flanges. Flanged versions include DIN and ASME options, with pressure ratings extending to high-pressure configurations depending on the selected connection and thermowell design.
The large selection of connections is particularly useful when replacing an existing thermometer or integrating the TM151 into established process piping.
iTHERM QuickSens for Fast Response
For applications where response time is important, the TM151 can be configured with iTHERM QuickSens technology. Endress+Hauser identifies the QuickSens design as one of the options for achieving fast temperature response through improved sensor construction and thermal coupling.
iTHERM StrongSens for High Vibration Resistance
The iTHERM StrongSens sensor option is intended for demanding applications where mechanical vibration is a concern. Endress+Hauser describes StrongSens as providing high vibration resistance while maintaining reliable temperature measurement.
iTHERM TwistWell for High-Velocity Applications
The TM151 can also be configured with the iTHERM TwistWell thermowell, which uses a helical design for applications involving high flow velocity.
This provides an alternative thermowell design for demanding flow conditions where conventional thermowell arrangements may require additional consideration.
Dual Seal for Additional Process Protection
For applications requiring an additional process barrier, the TM151 can be configured with a Dual Seal solution. Endress+Hauser identifies this as a second process barrier that can enhance safety in demanding installations.
QuickNeck for Easier Maintenance
The iTHERM QuickNeck option provides a divisible extension neck designed to simplify sensor removal and reduce maintenance downtime. This is particularly useful where regular sensor access is required.
Optional iTEMP Temperature Transmitter
The TM151 can be equipped with an iTEMP temperature transmitter. Depending on the selected transmitter, common industrial communication protocols and optional Bluetooth connectivity are available.
This allows the temperature sensor and signal-conditioning electronics to be configured as part of the same temperature measurement point.
Key Features
- Product type: Modular industrial thermometer
- RTD or thermocouple measurement
- PT100, Type K, Type J and Type N configurations
- Accuracy options including Class AA, A and B for IEC 60751 RTDs
- Thermocouple accuracy options according to IEC 60584-2
- Operating temperatures up to 1100°C, depending on configuration
- Static process pressure up to 500 bar, depending on configuration
- Immersion length up to 1500 mm
- Barstock thermowell or installation into an existing thermowell
- Multiple thermowell and protection tube materials
- Wide selection of threaded and flanged process connections
- Optional iTHERM QuickSens
- Optional iTHERM StrongSens
- Optional iTHERM TwistWell
- Optional Dual Seal
- Optional iTHERM QuickNeck
- Optional iTEMP temperature transmitter
- Bluetooth connectivity available with selected transmitter configurations
- ATEX, IECEx, CSA C/US, NEPSI and other approvals depending on configuration
Typical Applications
Chemical Processing
The TM151 can be configured for chemical process temperature measurement with suitable sensor, thermowell material and process connection combinations. Endress+Hauser lists the chemical industry among its target applications.
Oil and Gas
For oil and gas installations, the TM151 can be configured with appropriate thermowell materials, process connections and high-pressure designs to match demanding process conditions.
Power and Energy
The thermometer is suitable for temperature measurement in power-generation and energy applications, where robust thermowells, high-temperature sensors and suitable process connections may be required.
High-Temperature Processes
Thermocouple configurations such as Type K and Type N allow the TM151 to be configured for temperatures up to 1100°C, depending on the complete assembly.
High-Pressure Process Measurement
Selected configurations can withstand static process pressures up to 500 bar, making the TM151 suitable for demanding pressure and temperature measurement points. The actual pressure capability depends on the complete configuration.
High-Vibration Applications
Applications exposed to significant mechanical vibration can use the iTHERM StrongSens configuration, which Endress+Hauser identifies as a high-vibration-resistance option.
High-Velocity Flow Applications
The iTHERM TwistWell thermowell is available for applications involving high flow velocities, providing a helical thermowell design for these conditions.
General Industrial Temperature Measurement
The broad choice of sensors, thermowells, process connections and transmitters makes the TM151 suitable for general industrial temperature measurement as well as more specialized process applications.
FAQ
What is the Endress+Hauser TM151?
The iTHERM ModuLine TM151 is a modular industrial thermometer designed for process temperature measurement using RTD or thermocouple sensors. It can be configured with different thermowells, process connections, terminal heads and temperature transmitters.
Is the TM151 an RTD or thermocouple thermometer?
It can be configured as either. The TM151 supports PT100 RTD sensors as well as thermocouples including Type K, Type J and Type N.
What is the maximum temperature of the TM151?
The maximum temperature depends on the sensor configuration. Selected Type K and Type N configurations can reach 1100°C, while Type J is specified up to 800°C. PT100 configurations have different temperature limits, with the PT100 WW version reaching 600°C.
What is the maximum process pressure?
The maximum static process pressure is up to 500 bar, depending on the selected thermowell and process connection configuration.
What is the maximum immersion length?
The maximum immersion length available on request is 1500 mm.
What thermowell materials are available?
Depending on configuration, available materials include 316/316L, 316Ti, 347, 310, Alloy 600, Alloy C276, titanium and several steel grades.
Can the TM151 be installed in an existing thermowell?
Yes. The TM151 can be supplied with its own barstock thermowell or configured for installation into an existing thermowell.
Can the TM151 include a temperature transmitter?
Yes. An iTEMP temperature transmitter can be included depending on the selected configuration. Different iTEMP transmitters support different signal and communication options.
What is iTHERM QuickSens?
iTHERM QuickSens is a sensor design intended to provide fast response times through optimized sensor construction and thermal coupling. It is one of the optional technologies available for the TM151.
What is iTHERM StrongSens?
iTHERM StrongSens is an RTD sensor option designed for applications requiring high vibration resistance.
What is iTHERM TwistWell?
iTHERM TwistWell is a helical thermowell design intended for high-velocity applications. It is available as one of the TM151 configuration options.
Is the TM151 suitable for hazardous areas?
Yes. Depending on the selected configuration, Endress+Hauser lists international hazardous-area certifications including ATEX, IECEx, CSA C/US and NEPSI. The exact approval must be confirmed against the selected order code.
What is the difference between TM151 and a temperature transmitter?
The TM151 is the complete industrial thermometer/temperature assembly, including the sensing element and mechanical process-side components. An iTEMP transmitter can be integrated into the assembly to convert the sensor signal into a standardized output or digital communication signal.
