Thermocouple Element: Temperature Range -200°C to 1700°C

Component Specifications

Definition

A thermocouple element is a temperature sensing component that generates a voltage proportional to temperature differences between its two junctions, specifically designed for integration into molten metal temperature sensor probes used in metal casting, smelting, and refining operations.

Working Principle

Operates on the Seebeck effect where two dissimilar metals joined at two junctions produce a voltage when there is a temperature difference between the junctions. The hot junction is exposed to molten metal while the cold junction is maintained at a reference temperature.

Materials

High-temperature alloys: Type K (Chromel-Alumel: Ni-Cr/Ni-Al), Type R (Platinum-Rhodium: Pt-13%Rh/Pt), Type S (Platinum-Rhodium: Pt-10%Rh/Pt), or Type B (Platinum-Rhodium: Pt-30%Rh/Pt-6%Rh) depending on temperature range and chemical resistance requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±1.5°C or ±0.4% of reading
Insulation	Ceramic beads or magnesium oxide
Response Time	0.5-10 seconds
Wire Diameter	0.25-3.0 mm
Sheath Material	Inconel, stainless steel, or ceramic
Temperature Range	-200°C to 1700°C

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

Standards

ISO 6051, DIN 43710, ASTM E230

Parent Products

This component is used in the following industrial products

Molten Metal Temperature Sensor Probe

High-temperature immersion probe for continuous molten metal temperature monitoring

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal shock damage
Chemical contamination from molten metals
Oxidation at high temperatures
Mechanical failure during insertion/removal
Calibration drift over time

FMEA Triads

Trigger: Rapid temperature changes during insertion into molten metal
Failure: Cracked ceramic insulation or broken thermocouple wires
Mitigation: Use pre-heating procedures and gradual immersion techniques

Trigger: Chemical reaction with molten aluminum or other reactive metals
Failure: Corrosion of sheath and element materials
Mitigation: Select appropriate sheath materials (ceramic for aluminum, Inconel for steel)

Trigger: Mechanical stress during repeated insertion cycles
Failure: Fatigue failure of element connections
Mitigation: Implement proper handling procedures and use reinforced connection designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1.5°C or ±0.4% of reading (whichever is greater) per IEC 60584-2 Class 1

Test Method

Ice point reference method with certified calibration equipment, comparison against standard platinum resistance thermometer at multiple temperature points

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Thermocouple Element

Manufacturer profiles associated with Thermocouple Element.

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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

Related Components

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Valve body is the main structural housing of a molten metal flow control valve, designed to withstand extreme temperatures and corrosive environments while directing metal flow.

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Refractory liner for molten metal flow control valves, providing thermal insulation and erosion resistance in extreme temperature applications.

Work Rolls

Work rolls are precision cylindrical components in heavy-duty rolling mills that directly contact and deform metal during rolling operations.

Venting Channels

Venting channels are precision-engineered passages in metal casting mold cores designed to allow gases to escape during the molten metal pouring process, preventing defects and ensuring high-quality castings.

Frequently Asked Questions

What is the maximum temperature a thermocouple element can measure in molten metal applications?

Type B thermocouple elements can measure up to 1700°C continuously, with short-term exposure up to 1800°C, making them suitable for most molten metal applications including steel and copper alloys.

How often should thermocouple elements be calibrated in industrial use?

For critical molten metal temperature measurements, calibration should be performed every 3-6 months or after 500-1000 measurement cycles, whichever comes first, to maintain accuracy within ±1.5°C.

What factors affect thermocouple element lifespan in molten metal applications?

Lifespan is affected by temperature cycling frequency, chemical exposure to molten metals, mechanical stress during insertion/removal, and oxidation at high temperatures. Proper sheath material selection can extend service life.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Thermocouple Element