Protective Sheath / Housing: Diameter 3mm to 25mm standard

Component Specifications

Definition

A protective sheath or housing is an essential component of industrial temperature sensors, designed to shield the sensitive sensing element from harsh environmental conditions, physical damage, and chemical exposure. It ensures accurate temperature measurement by maintaining sensor integrity, preventing contamination, and facilitating proper installation in various industrial processes. The housing typically includes features for secure mounting, thermal conductivity optimization, and compatibility with different sensor types and process connections.

Working Principle

The protective sheath/housing operates by creating a physical barrier between the temperature sensing element and the external environment. It transfers thermal energy from the process medium to the sensor while protecting against mechanical stress, corrosion, and contamination. The housing material and design are optimized for thermal conductivity, response time, and durability, ensuring reliable temperature measurement in demanding industrial conditions.

Materials

Stainless steel (AISI 304, 316, 321, 310), Inconel, Hastelloy, Titanium, Ceramic, PTFE (Teflon), Aluminum, Carbon steel with protective coatings. Material selection depends on temperature range, corrosion resistance requirements, and process compatibility.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	50mm to 2000mm custom
Diameter	3mm to 25mm standard
Pressure Rating	Up to 400 bar
Insertion Length	Adjustable based on application
Protection Rating	IP67, IP68, NEMA 4X
Temperature Range	-200°C to +1200°C
Process Connection	Threaded (NPT, BSP, Metric), Flanged, Weld-in, Compression
Thermal Response Time	T50: 0.5-5 seconds (fast response), T90: 2-30 seconds

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 6708, ISO 228-1, DIN 43772, DIN 3852, ASME B1.20.1, IEC 60529

Parent Products

This component is used in the following industrial products

Temperature Sensors

Temperature sensors measure and monitor temperature within the Sterilization Zone to ensure precise thermal control during sterilization processes.

View Product Details

Engineering Analysis

Risks & Mitigation

Material corrosion leading to sensor failure
Thermal stress cracking
Inadequate pressure rating causing rupture
Poor thermal contact affecting accuracy
Vibration-induced fatigue failure
Chemical incompatibility with process media

FMEA Triads

Trigger: Corrosive process media
Failure: Housing corrosion and penetration
Mitigation: Select corrosion-resistant materials (Hastelloy, Titanium), apply protective coatings, implement regular inspection schedules

Trigger: Thermal cycling and shock
Failure: Cracking and material fatigue
Mitigation: Use materials with good thermal expansion properties, design with gradual temperature transitions, implement thermal stress analysis

Trigger: Mechanical vibration
Failure: Loosening of connections and structural fatigue
Mitigation: Use vibration-resistant mounting, implement locking mechanisms, select appropriate insertion lengths, use reinforced designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% of reading for temperature measurement, dimensional tolerances per ISO 2768-m, pressure rating ±10% of specified value

Test Method

Pressure testing per ASME B40.100, temperature calibration per IEC 60751, material certification per ASTM/EN standards, leak testing per ISO 15848

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 Protective Sheath / Housing

Manufacturer profiles associated with Protective Sheath / Housing.

Sourcing Protective Sheath / Housing from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between a protective sheath and a thermowell?

A protective sheath is typically integrated with the sensor and provides direct protection, while a thermowell is a separate removable pocket that allows sensor replacement without process shutdown. Thermowells offer better protection in high-pressure/vibration applications.

How do I select the right material for my temperature sensor housing?

Material selection depends on process temperature, chemical compatibility, pressure requirements, and thermal conductivity needs. Stainless steel 316 is common for general applications, while Inconel or Hastelloy are used for high-temperature corrosive environments.

What factors affect thermal response time in protective housings?

Response time is influenced by housing material thermal conductivity, wall thickness, sensor fit within the housing, and the medium being measured. Thinner walls and better thermal conductivity materials provide faster response.

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.

Protective Sheath / Housing