Metal Sheath: Outer Diameter 6mm to 25mm

Component Specifications

Definition

A metal sheath is a protective tubular component designed to encase and shield the sensitive elements of a molten metal temperature sensor probe from extreme thermal, chemical, and mechanical stresses encountered in high-temperature industrial environments such as foundries, steel mills, and metal casting operations. It ensures sensor longevity and measurement accuracy by providing a durable barrier.

Working Principle

The metal sheath operates on the principle of thermal conduction and protection. It is inserted into molten metal, where it rapidly equilibrates to the metal's temperature. The sheath transfers heat to the internal sensor element (typically a thermocouple or RTD) while shielding it from direct contact with corrosive, abrasive, or electrically conductive molten materials. Its design minimizes thermal lag and maximizes response time.

Materials

High-temperature alloys such as Inconel 600, Incoloy 800H, 310 Stainless Steel, or Molybdenum for ultra-high temperatures. Material selection depends on maximum service temperature (up to 1800°C), corrosion resistance (against molten iron, aluminum, copper, etc.), and thermal conductivity requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	300mm to 1200mm
Outer Diameter	6mm to 25mm
Wall Thickness	1.5mm to 4mm
Connection Type	Threaded (e.g., NPT, BSP), Flanged, or Weld-in
Immersion Depth	Standard 300mm, custom available
Max Temperature	1200°C to 1800°C
Pressure Rating	Atmospheric to 5 bar

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 13732-1, DIN 43735, 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 fatigue cracking
Chemical corrosion from slag/flux
Mechanical damage during insertion/removal
Inaccurate readings due to sheath contamination

FMEA Triads

Trigger: Repeated thermal cycling
Failure: Crack formation in sheath wall
Mitigation: Use alloys with high thermal fatigue resistance; implement controlled heating/cooling cycles.

Trigger: Chemical attack from molten metal impurities
Failure: Corrosion and wall thinning
Mitigation: Select corrosion-resistant materials; apply protective coatings if compatible.

Trigger: Improper handling or insertion
Failure: Bending or puncture of sheath
Mitigation: Train operators; use guided insertion tools; design with robust wall thickness.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% of reading for temperature accuracy, dimensional tolerances per ISO 2768-m

Test Method

Calibration per ASTM E220, pressure testing per ISO 15848, material certification per EN 10204 3.1

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

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Manufacturers of Metal Sheath

Manufacturer profiles associated with Metal Sheath.

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Frequently Asked Questions

What is the primary function of a metal sheath in a molten metal temperature sensor?

To protect the internal sensor element from direct exposure to molten metal, preventing corrosion, abrasion, and electrical interference while ensuring accurate temperature measurement.

How do I select the right material for a metal sheath?

Choose based on the molten metal type (e.g., iron, aluminum), temperature range, chemical compatibility, and required service life. Common materials include Inconel for general use and Molybdenum for extreme temperatures.

Can metal sheaths be reused after exposure to molten metal?

Yes, if undamaged and cleaned properly, but lifespan depends on material degradation from thermal cycling and corrosion. Regular inspection is recommended.

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.

Metal Sheath