Sheath/Probe: Temperature Range -200°C to 1800°C

Component Specifications

Definition

A sheath/probe assembly is the protective outer casing and sensing tip of a thermocouple temperature sensor, designed to shield the thermocouple junction from harsh environments while ensuring accurate thermal transfer. It consists of a metallic or ceramic sheath that encases the thermocouple wires and a probe tip where the temperature measurement occurs. This component provides mechanical protection, electrical insulation, and chemical resistance in industrial settings where temperature monitoring is critical.

Working Principle

The sheath/probe functions by transferring heat from the measured medium through the sheath material to the thermocouple junction inside. The sheath acts as a protective barrier while maintaining thermal conductivity to ensure the thermocouple junction reaches equilibrium with the target temperature. Different sheath materials and designs optimize response time, accuracy, and durability based on application requirements.

Materials

Stainless steel (304, 316, Inconel), ceramic (alumina, mullite), nickel alloys, titanium, or specialized coatings depending on temperature range and chemical exposure. Common specifications include ASTM A213 for seamless tubes or equivalent standards.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	50mm to 2000mm
Diameter	1.5mm to 25mm
Response Time	0.5 to 30 seconds
Pressure Rating	Up to 1000 bar
Protection Class	IP67 or higher
Temperature Range	-200°C to 1800°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 9001, DIN 43735, IEC 60584

Parent Products

This component is used in the following industrial products

Temperature Sensor (Thermocouple)

A temperature measurement device that converts thermal energy into electrical voltage using the Seebeck effect.

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Thermocouple

Temperature sensor that generates voltage proportional to temperature difference

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Engineering Analysis

Risks & Mitigation

Thermal shock damage
Chemical corrosion
Mechanical fatigue
Electrical leakage
Calibration drift

FMEA Triads

Trigger: Thermal cycling beyond material limits
Failure: Crack formation in sheath
Mitigation: Use materials with matching thermal expansion coefficients and implement gradual temperature changes

Trigger: Chemical attack from process media
Failure: Corrosion and pitting
Mitigation: Select chemically resistant sheath materials and implement regular inspection schedules

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.75% of reading or ±2.2°C, whichever is greater (for Type K thermocouples)

Test Method

ASTM E220 for calibration, ISO/IEC 17025 for testing laboratories

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.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Sheath/Probe

Manufacturer profiles associated with Sheath/Probe.

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Frequently Asked Questions

What is the difference between a sheath and a probe in temperature sensors?

The sheath refers to the protective outer casing, while the probe typically includes both the sheath and the sensing tip assembly. In practice, these terms are often used interchangeably for the complete protective housing component.

How do I select the right sheath material for my application?

Consider temperature range, chemical compatibility, mechanical stress, and required response time. Stainless steel works for most applications up to 800°C, while ceramic sheaths handle higher temperatures up to 1800°C in corrosive environments.

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.

Sheath/Probe