Editorial Technical Reference

Molten Metal Temperature Sensor Probe

This page explains how Molten Metal Temperature Sensor Probe is classified within Other Basic Metal Production. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

High-temperature immersion probe for continuous molten metal temperature monitoring

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Molten Metal Temperature Sensor Probe in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Molten Metal Temperature Sensor Probe

Definition
This specialized industrial sensor component is designed for direct immersion into molten metal streams or baths to provide real-time temperature measurements. It enables precise thermal control in basic metal production processes such as smelting, refining, and casting. The probe withstands extreme temperatures and corrosive molten metal environments while maintaining measurement accuracy. It integrates with temperature control systems to optimize energy efficiency and product quality in non-ferrous and specialty metal production.

Constructed with an alumina ceramic protective sheath and a molybdenum alloy inner structure, the probe houses a platinum-rhodium thermocouple (Type B) for high-temperature sensing. The sheath material is molybdenum disilicide (MoSi2), which offers resistance to thermal shock. The probe is available with immersion lengths from 500 to 1500 mm and sheath diameters from 16 to 25 mm, depending on the application. It operates at temperatures up to 1600 °C and meets accuracy Class 1 per IEC 60584, with a thermal response time of ≤5 seconds. The insulation resistance is ≥100 MΩ at 500 V DC, and the ingress protection rating is IP65. The process connection is G1/2 thread per ISO 228-1, and the operating pressure range is 1.0–1.6 MPa. The weight varies from 1.5 to 3.0 kg depending on length and diameter.

This probe is intended for use in basic metal production environments where continuous temperature monitoring is critical. It is not a standalone measurement system; it requires integration with a suitable temperature transmitter or control system. The probe is a component, not a complete instrument. For procurement, verify model-specific parameters such as exact immersion length, sheath diameter, and process connection with the manufacturer. Also confirm that the probe's specifications meet the requirements of your specific molten metal application, including chemical compatibility and thermal cycling conditions. Always consult the supplier for detailed installation and maintenance guidelines.
Working Principle
The probe operates on the thermoelectric effect. A platinum-rhodium thermocouple (Type B) generates a small voltage proportional to the temperature difference between the hot junction (immersed in molten metal) and the cold junction (at the instrument connection). This voltage is measured and converted to temperature using standard reference tables (IEC 60584). The thermocouple is protected by a molybdenum disilicide sheath and alumina ceramic insulation, which shield it from the corrosive and high-temperature environment. The response time is fast (≤5 s) due to the thin sheath and direct contact with the melt.
Common Materials
Alumina Ceramic, Molybdenum Alloy, Platinum-Rhodium Thermocouple Wire
Technical Parameters
ParameterTypical rangeNotes & selection driver
Maximum Operating TemperatureRequired1600 °CHighest temperature the probe can continuously measure
Immersion LengthRequired500–1500 mmLength of probe section designed for molten metal immersion
Sheath DiameterRequired16–25 mmOuter diameter of protective sheath
Accuracy ClassRequired1 ClassMeasurement accuracy classification per IEC 60584IEC 60584
Thermal Response Time≤5 secondsTime constant for 63.2% temperature responseIEC 60584
Thermocouple TypeBPlatinum-rhodium; suitable for high temperaturesIEC 60584
Sheath MaterialMoSi2Molybdenum disilicide; resistant to thermal shock
Insulation Resistance≥100 MΩAt 500 V DC, ambient temperatureIEC 60751
Ingress ProtectionIP65Dust-tight and protected against water jetsIEC 60529
Process ConnectionG1/2Thread size; other connections availableISO 228-1
Weight1.5–3.0 kgDepends on length and diameter

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 Element Part
    Generates voltage signal proportional to temperature
    Material: Platinum-Rhodium Alloy
  • Ceramic Protection Tube Part
    Provides thermal and chemical protection for sensing element
    Material: High-Purity Alumina
  • Metal Sheath Optional Part
    Outer protective layer against mechanical damage
    Material: Molybdenum Alloy
  • Connection Head Part
    Houses electrical connections and provides mounting interface
    Material: Stainless Steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits
accuracy: ±1°C to ±3°C
pressure: 0 to 2 bar (atmospheric to low pressure)
temperature: 1200°C to 1800°C
response time: 3 to 8 seconds typical
immersion depth: 300mm to 1500mm standard
Media Compatibility
✓ Aluminum alloys (600-800°C) ✓ Copper alloys (1000-1200°C) ✓ Steel/iron melts (1500-1700°C)
Unsuitable: Chlorine-containing atmospheres or highly corrosive fluxes
Sizing Data Required
  • Required immersion depth (based on vessel geometry)
  • Target temperature range and accuracy needs
  • Installation method (port size, mounting flange requirements)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal shock cracking
Cause: Rapid temperature changes causing differential expansion between protective sheath and sensing element, leading to ceramic or metal fatigue and fracture.
Chemical corrosion/erosion
Cause: Exposure to aggressive molten metal alloys (e.g., aluminum, zinc) or slag components that degrade protective sheathing materials over time.
Maintenance Indicators
  • Erratic or drifting temperature readings compared to other process indicators
  • Visible physical damage to probe tip such as cracks, pitting, or material buildup on sensing surface
Engineering Tips
  • Implement controlled pre-heating protocols before immersion to minimize thermal shock stress on probe materials
  • Use alloy-specific protective sheathing materials (e.g., alumina for aluminum, silicon carbide for iron-based alloys) matched to the molten metal chemistry

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM E988 - Standard Specification for Thermocouple Sheath Materials CE Marking - EU conformity for safety and performance

Quoted from the published standard.

Manufacturing Precision
  • Temperature Accuracy: +/- 1.5°C at 1600°C
  • Sheath Diameter: +/- 0.05mm
Quality Inspection
  • Thermal Shock Test - rapid immersion in molten metal
  • Calibration Verification - against certified reference standards
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
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Supplier transparency
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Manufacturers of Molten Metal Temperature Sensor Probe

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Frequently Asked Questions

What is the maximum operating temperature of this probe?

The maximum continuous operating temperature is 1600 °C, as listed in the specifications. However, actual performance may depend on the specific molten metal composition and immersion conditions. Always verify with the manufacturer for your application.

What thermocouple type is used?

The probe uses a platinum-rhodium thermocouple Type B, which is suitable for high temperatures up to 1600 °C. This type is standardized under IEC 60584.

Can the probe be used in all molten metals?

The probe is designed for basic metal production, but compatibility with specific molten metals (e.g., steel, copper, aluminum) must be confirmed with the manufacturer. The sheath material and design may limit use in certain aggressive environments.

What is the thermal response time?

The thermal response time (time constant for 63.2% response) is ≤5 seconds, per IEC 60584. This allows for relatively fast temperature readings, but actual response may vary with installation and melt conditions.

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

Related equipment

Industrial Ecosystem & Supply Chain Structure

Downstream Applications

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Molten Metal Temperature Sensor Probe.

Molten Metal Thermocouple Probe High-Temperature Immersion Sensor Metal Melt Temperature Probe

Data Basis

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

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.

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 12 October 2026

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