Thermocouple Assembly for Tundish Pre-Heating Systems

Product Specifications

Technical details and manufacturing context for Thermocouple Assembly

Definition

This thermocouple assembly is a component designed for integration into tundish pre-heating systems in basic metal manufacturing. Its primary function is to provide continuous temperature monitoring of molten metal, ensuring optimal pouring conditions and preventing premature solidification. The assembly consists of a thermocouple sensor, a protective sheath, a connection head, and extension wires. The sensor is a Type K thermocouple (Chromel-Alumel) with a temperature range of 0–1300 °C and an accuracy class of Class 1 per IEC 60584. The protective sheath is made of Inconel 600, with a diameter of 6–12 mm and an insertion length of 300–1500 mm. The connection head is rated IP65 (dust-tight and protected against water jets) and is made of stainless steel (grade 310S per ASTM A312). The process connection is a G1/2 thread per ISO 228-1. The assembly operates at pressures of 1.0–1.6 MPa and has an insulation resistance of ≥100 MΩ at 500 V DC (per IEC 60751). Response time is 2–10 seconds (time to reach 63.2% of a step change). Weight ranges from 0.5–2.5 kg depending on length and head type. The working principle is based on the Seebeck effect: two dissimilar metals joined at the measuring junction generate a voltage proportional to the temperature difference between the hot junction (immersed in molten metal) and the cold junction (reference point). This electrical signal is transmitted to temperature controllers or monitoring systems. The assembly is intended for use in tundish pre-heating systems, where it is immersed in molten metal. Selection inputs include required insertion length, sheath diameter, and process connection type. Verification questions should confirm model-specific values for temperature range, accuracy, pressure rating, and compliance with relevant standards. Maintenance signals include visible sheath wear, corrosion, or damage, and erratic temperature readings. Failure boundaries include exceeding the maximum temperature or pressure, which can lead to sheath failure and loss of measurement integrity. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The thermocouple assembly operates on the Seebeck effect, where two dissimilar metals (Chromel and Alumel) joined at the measuring junction produce a voltage proportional to the temperature difference between the hot junction (immersed in molten metal) and the cold junction (reference point). This voltage is transmitted via extension wires to a temperature controller or monitoring system, which converts it to a temperature reading. The protective sheath isolates the sensor from the molten metal, while ceramic insulation beads prevent electrical short circuits. The connection head houses the electrical terminations and provides a sealed interface (IP65) to protect against dust and water jets.

Common Materials

Type K thermocouple wire (Chromel-Alumel), Inconel 600 protective sheath, Ceramic insulation beads, Stainless steel connection head

Technical Parameters

Parameter	Typical range	Notes & selection driver
Temperature Range	0–1300 °C	Type K thermocouple; continuous operation up to 1100°CIEC 60584
Accuracy Class	Class 1	±1.5°C or ±0.4% of reading, whichever is greaterIEC 60584
Sheath Diameter	6–12 mm	Larger diameter for higher mechanical strength
Insertion Length	300–1500 mm	Custom lengths available
Response Time	2–10 s	Time to reach 63.2% of step change
Insulation Resistance	≥100 MΩ	At 500 V DC, ambient temperatureIEC 60751
Operating Pressure	1.0–1.6 MPa
Sheath Material	310S	Stainless steel for high temperature oxidation resistanceASTM A312
Thermocouple Type	K	Nickel-chromium / Nickel-aluminumIEC 60584
Connection Head	IP65	Dust-tight and protected against water jetsIEC 60529
Process Connection	G1/2	Thread size; other sizes availableISO 228-1
Weight	0.5–2.5 kg	Depends on length and head type

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Thermocouple Sensor
Generates voltage signal proportional to temperature difference

Material: Type K thermocouple wire (Chromel-Alumel)
Protective Sheath Part
Protects thermocouple from molten metal corrosion and thermal shock

Material: Inconel 600
Connection Head
Houses terminal connections and provides environmental protection

Material: Stainless steel
Extension Wires Part
Transmits thermocouple signal to monitoring equipment

Material: Compensating cable with thermocouple alloy
Ceramic Insulation Beads
Keep the two thermocouple legs apart inside the sheath so they only touch at the hot junction.

Material: Ceramic

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Tundish with Pre-Heating

View system integration details

Manufacturers of Thermocouple Assembly

Manufacturer profiles associated with Thermocouple Assembly.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the temperature range of this thermocouple assembly?

The temperature range is 0–1300 °C for continuous operation, with a maximum of 1100 °C for continuous use as noted. The accuracy class is Class 1 per IEC 60584. Always verify the specific model's range with the manufacturer.

What materials are used in the construction?

The thermocouple wire is Type K (Chromel-Alumel), the protective sheath is Inconel 600, the connection head is stainless steel (grade 310S), and ceramic insulation beads are used. These materials are selected for high-temperature resistance and mechanical strength.

What is the response time of the assembly?

The response time is 2–10 seconds, defined as the time to reach 63.2% of a step change in temperature. This can vary with installation and process conditions.

What standards apply to this product?

Relevant standards include IEC 60584 for thermocouple accuracy, IEC 60751 for insulation resistance, and IEC 60529 for the IP65 connection head. These are reference standards; compliance must be confirmed with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 10 bar (145 psi) for standard assemblies, higher pressures with special designs
other spec:	Immersion depth: 300-1000mm typical, response time: 2-10 seconds depending on sheath thickness and configuration
temperature:	Up to 1800°C (3272°F) for short-term immersion, continuous use typically 1200-1600°C depending on sheath material

Thermocouple Assembly

Product Specifications

Applied To / Applications

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