Termination Head: Temperature Range -200°C to +1200°C

Q: What is the purpose of cold junction compensation in termination heads?

Cold junction compensation corrects for temperature variations at the connection point between thermocouple wires and copper conductors, ensuring accurate temperature readings by accounting for the Seebeck voltage generated at this junction.

Q: Can termination heads be used with different thermocouple types?

Yes, but they must be specifically designed for the thermocouple type (J, K, T, E, N, R, S, B) as each has different electrical characteristics and compensation requirements.

Q: How do I select the right termination head for harsh environments?

Choose termination heads with higher IP ratings (IP67 or IP69K), corrosion-resistant materials (316L stainless steel), and appropriate temperature ratings for your application environment.

Component Specifications

Definition

A termination head is a critical component in precision thermocouple probe assemblies that provides a secure, insulated connection point between the thermocouple extension wires and the measurement instrument. It houses the cold junction compensation circuitry, protects the connection from environmental factors, and ensures signal integrity by maintaining proper electrical continuity and thermal isolation.

Working Principle

The termination head operates by providing a stable transition point where thermocouple wires connect to copper conductors leading to the measurement instrument. It maintains the Seebeck effect continuity while compensating for temperature variations at the connection point through integrated cold junction compensation. The housing provides mechanical protection, electrical insulation, and environmental sealing to prevent signal degradation.

Materials

Housing: Stainless steel 316L or high-temperature engineering plastics (PEEK, PTFE). Insulation: Ceramic or high-temperature fiberglass. Contacts: Nickel-plated copper or gold-plated beryllium copper. Seals: Silicone or fluorocarbon O-rings. Terminal blocks: High-temperature thermoset plastics.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Size	M20x1.5 or NPT 1/2"
Mounting Type	Panel or conduit
Electrical Rating	600V AC/DC
Temperature Range	-200°C to +1200°C
Contact Resistance	< 5 mΩ
Ingress Protection	IP67 minimum
Dielectric Strength	2000V RMS
Housing Material Grade	316L Stainless Steel
Wire Gauge Compatibility	AWG 14-24

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, IEC 60584, ASTM E230, DIN 43710

Parent Products

This component is used in the following industrial products

Precision Thermocouple Probe Assembly

A precision thermocouple probe assembly is a critical temperature sensing component used in industrial measurement, testing, and control equipment.

View Product Details

Automatic Wiring System

An automated system for routing and connecting electrical conductors within medium voltage switchgear assemblies.

View Product Details

Engineering Analysis

Risks & Mitigation

Electrical short circuits
Signal drift due to poor connections
Moisture ingress causing corrosion
Thermal shock damage
Incorrect cold junction compensation

FMEA Triads

Trigger: Loose wire connections
Failure: Intermittent or lost temperature signal
Mitigation: Use proper torque specifications for terminal screws and implement regular maintenance checks

Trigger: Moisture ingress through damaged seals
Failure: Corrosion and signal degradation
Mitigation: Regular seal inspection and replacement, proper installation with correct torque on sealing components

Trigger: Incorrect thermocouple type matching
Failure: Systematic measurement errors
Mitigation: Clear labeling, color coding, and verification procedures during installation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1°C for cold junction compensation, ±0.5% for overall measurement accuracy

Test Method

ASTM E220/E230 for thermocouple calibration, IEC 60584 for type testing, IP testing per IEC 60529

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 Termination Head

Manufacturer profiles associated with Termination Head.

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Frequently Asked Questions

What is the purpose of cold junction compensation in termination heads?