Available Available for project application review and quotation
Temperature Measurement Series
BDT-SKIN

BDT-SKIN Tube-Skin Thermocouples

Engineered tube-wall temperature measurement for fired heaters, boilers, reformers, process furnaces, and high-temperature equipment.

Brand: Blue Dragon Technology Manufactured by: MESIT, Italy Supply & support: Blue Dragon Technology
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Product Overview

Purpose-built measurement, clearly presented.

The BDT-SKIN is an engineered tube-skin thermocouple assembly for direct measurement of external tube-wall temperature in petrochemical heaters, boiler and superheater tubes, reformers, cracking furnaces, and other high-temperature process equipment.

MESIT configurations use a metal sheath with MgO-insulated thermocouple wire and may incorporate a curved heat-retention shield, expansion loops or coils, and weldable mounting clamps. Each assembly is fabricated from the installation drawings so that the sensing junction, mounting arrangement, routing, length, and termination suit the tube geometry and operating conditions.

Distinctive Capabilities

  • Expansion loops or coils to accommodate thermal movement
  • Weldable mounting clamps for secure installation
  • Custom fabrication from installation drawings
  • Application-specific sensor routing, length, and termination
Performance & Technical Data

The measurement method and the values that matter.

How it measures

Measurement Principle

Two dissimilar thermocouple conductors generate a thermoelectric voltage in response to the temperature difference between the measuring junction and the reference junction. In the BDT-SKIN assembly, the measuring junction is thermally coupled to the external tube surface so that the resulting signal represents the local tube-wall temperature. The mounting arrangement, heat-retention shield, surface contact, sheath routing, and expansion allowance are engineered to support representative measurement while accommodating tube movement and the surrounding thermal environment.

Measurement ParametersExternal tube-wall or equipment-surface temperature
Sensor technologyThermocouple; type selected for the application
ConstructionMetal sheath with MgO-insulated thermocouple wire
Documented sensor lengthFrom a few feet to over 50 ft; final length is project specific
Surface interfaceEngineered measuring junction with curved heat-retention shield
Thermal-growth compensationExpansion loop or coil where required

Complete Technical Data

Mounting
Weldable clamp or project-specific attachment arrangement
Tube size and geometry
Designed from installation drawings
Sheath, shield, and mounting materials
Selected for the operating temperature and service environment
Temperature range
Dependent on thermocouple type, construction materials, mounting, and service conditions
Termination
Project-specific cable, connector, terminal head, or junction-box arrangement
Calibration and documentation
Specified according to project requirements
Availability
Available for project application review and quotation
Industrial Use

Applications and industries.

Typical Applications

Petrochemical process-heater tube-wall temperature measurementBoiler and superheater tube monitoringFired-heater and process-furnace tubesSteam-reformer and cracking-furnace tubesHigh-temperature piping and equipment surfacesThermal-condition monitoring of process tubesTube-Skin Temperature Measurement

Industries Served

Boilers & Steam SystemsCement, Glass & CeramicsChemical ProcessingFertilizer & AgrochemicalsFertilizers & ChemicalsFired Heaters & Process FurnacesHydrogen & SyngasIndustrial Furnaces & Heat TreatmentMetals, Mining & MaterialsNatural Gas & LNGPetrochemicalPetrochemicalsPower GenerationPulp & PaperRefineriesRefiningSteel & Metallurgy
Engineering & Integration

Built for specification, installation, and long-term operation.

Engineering focuses on the thermal contact, attachment method, heat shielding, expansion accommodation, sensor routing, and termination required to obtain representative tube-wall measurements without overstressing the assembly.

Measurement targetExternal tube wall or equipment surface
Attachment basisCustom weldable clamp or project-specific mounting
Thermal movementExpansion loop or coil where required
Engineering inputTube geometry, operating conditions, routing, and installation drawings

Sensor Construction

  • Project EngineeredThermocouple type, measuring-junction construction, sheath, heat shield, mounting arrangement, expansion loop, lead length, and termination are selected for the application.
  • Project EngineeredThe sensor assembly is fabricated against the tube geometry and approved installation drawings.
  • Application DependentTerminal heads, junction boxes, extension cables, connectors, and signal-conditioning arrangements are defined during project review.

Materials & Junction Design

  • StandardThe thermocouple measuring junction is thermally coupled to the external tube or equipment surface.
  • Project EngineeredThe contact geometry, heat-retention shield, clamp, weld attachment, and sheath route are designed around the monitored tube.
  • Application DependentSurface preparation, attachment procedure, and local thermal conditions must be reviewed before fabrication and installation.

Mounting & Installation

  • Project EngineeredInstallation is based on the tube diameter, tube material, furnace or boiler geometry, available access, expected thermal movement, and cable-routing requirements.
  • Project EngineeredExpansion loops or coils are positioned to accommodate movement without transferring excessive mechanical stress to the sensing junction.
  • Application DependentWelding and mounting procedures must follow the plant-approved installation and material-control requirements.
  • StandardA passive thermocouple does not require local operating power; any transmitter or signal conditioner has separate project-specific utility requirements.

Signal & Termination

  • Application DependentThe thermocouple signal may be connected through compatible extension cable to a temperature transmitter, control system input, monitoring system, or project-specific junction box.
  • Project EngineeredThermocouple type, polarity, extension-cable type, cold-junction compensation, channel identification, and termination details must be coordinated with the plant instrumentation system.
  • Application DependentTransmitter outputs, communication protocols, alarms, and control-system integration are specified separately when required.

Calibration & Quality

  • Application DependentThermocouple type, tolerance class, measuring-junction construction, and required calibration documentation are specified at quotation.
  • Project EngineeredCalibration points and traceability requirements should reflect the intended operating range and plant quality system.
  • StandardSensor identification and polarity must remain traceable through fabrication, installation, and termination.

Maintenance & Replacement

  • StandardPeriodic inspection should verify the mounting condition, surface contact, sheath integrity, expansion-loop condition, cable routing, and terminal connections.
  • Application DependentInspection intervals are determined by the operating temperature, thermal cycling, vibration, furnace environment, and plant maintenance strategy.
  • Project EngineeredReplacement assemblies should preserve the approved sensor position, attachment geometry, thermocouple type, and routing arrangement.

Process & Application Considerations

  • Application DependentWelding or attachment to process tubes must be performed only under approved plant procedures and material-control requirements.
  • Application DependentTube material, operating temperature, thermal expansion, vibration, radiant heat, and furnace atmosphere must be included in the application review.
  • Project EngineeredHazardous-area accessories or electrical equipment require the appropriate project-specific certification.
  • StandardThe sensor assembly must not obstruct required inspection access or impose unacceptable mechanical loading on the monitored tube.
Application Review

Application Engineering Notes

The available MESIT material does not define one universal thermocouple type, temperature range, tolerance, response time, sheath alloy, mounting dimension, hazardous-area approval, or calibration standard for every tube-skin assembly.

Before quotation, obtain the tube outside diameter, tube material, normal and maximum wall temperatures, furnace or boiler arrangement, required thermocouple type, mounting preference, expansion direction, sheath route, lead length, termination location, hazardous-area classification, and required documentation.

Application Engineering

Discuss your measurement application.

Share the sample, measurement range, operating conditions, project location, and timeline. Blue Dragon Technology will review the application and recommend the appropriate configuration.

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Product Family

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