---
title: "Thermocouple Assembly"
industry: "Basic Metal Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:THERMOCOUPLE_ASSEMBLY"
  data_integrity_hash: "b0dfc57c42bfb117863be525afef0dfc"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:THERMOCOUPLE_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/product/thermocouple-assembly.md"
  official_resource_url: "https://cnfx.com/industry/basic-metal-manufacturing/product/thermocouple-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-1600°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 1650
    unit: "°C"
    consequence: "Thermal degradation of Type K (Chromel-Alumel) thermocouple junction above 1372°C causes calibration drift exceeding ±0.75% of reading"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Molten steel penetration through sheath micro-cracks"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Double-walled sheath design with argon purge at 0.2 bar positive pressure"
  - node_2:
      trigger: "Cyclic thermal stress from 25-1550°C pre-heat cycles"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Monolithic cold-worked sheath construction with 12% minimum elongation at 800°C"
bom_nodes:
  thermocouple-sensor:
    type: "part"
    urn: "URN:CNFX:ME:THERMOCOUPLE_SENSOR"
    interface_type: "physical-logic-coupled"
  protective-sheath:
    type: "component"
    urn: "URN:CNFX:ME:PROTECTIVE_SHEATH"
    interface_type: "physical-logic-coupled"
  connection-head:
    type: "part"
    urn: "URN:CNFX:ME:CONNECTION_HEAD"
    interface_type: "physical-logic-coupled"
  extension-wires:
    type: "component"
    urn: "URN:CNFX:ME:EXTENSION_WIRES"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/basic-metal-manufacturing/product/thermocouple-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "9de63877302f6a6072baef6c20f4034f1b2742cfade13924f95725733d2e5bcc"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Thermocouple Assembly

## 1. Technical Definition
Temperature measurement device for monitoring molten metal temperature in tundish pre-heating systems

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-1600°C**. Failure boundary: **1650°C sheath melting point for Inconel 600**, Mechanism: **Thermal degradation of Type K (Chromel-Alumel) thermocouple junction above 1372°C causes calibration drift exceeding ±0.75% of reading**.

### 2.1 Analytical Physics Model
Governed by the **Joule Heating & Thermal Resistance**:

> **Primary Equation**: $P = I^2 R = \frac{V^2}{R}$  
> **Engineering Impact**: Governs heating element sizing for shrink tunnels/sealers.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| I | Current | Engineering Constant |
| R | Resistance | Engineering Constant |
| V | Voltage | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Molten steel penetration through sheath micro-cracks | 8 | Short-circuit between thermocouple wires via conductive slag layer | Double-walled sheath design with argon purge at 0.2 bar positive pressure |
| Cyclic thermal stress from 25-1550°C pre-heat cycles | 8 | Sheath fatigue cracking at weld joints after 5000 cycles | Monolithic cold-worked sheath construction with 12% minimum elongation at 800°C |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Thermocouple Sensor](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/thermocouple-sensor.md) `(Standalone System)`
- [Connection Head](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/connection-head.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Temperature Calibration Furnace**, **Signal Conditioner/Transmitter**, **Data Acquisition System**  
**Downstream Applications**: Steel Slabs, Aluminum Ingots, Copper Rods  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: Why is Inconel 600 used for the protective sheath in this thermocouple assembly?
**A**: Inconel 600 provides excellent resistance to oxidation and corrosion at high temperatures, making it ideal for prolonged exposure to molten metal environments in tundish pre-heating systems.

### Q: What makes Type K thermocouple wire suitable for molten metal temperature measurement?
**A**: Type K (Chromel-Alumel) thermocouples offer a wide temperature range (-200°C to 1260°C), good accuracy, and reliable performance in oxidizing atmospheres commonly found in basic metal manufacturing processes.

### Q: How does ceramic insulation improve thermocouple performance in tundish applications?
**A**: Ceramic insulation beads provide superior electrical insulation at high temperatures, prevent short circuits, and maintain measurement accuracy while withstanding thermal shock from molten metal contact.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Thermocouple Assembly](https://cnfx.com/industry/basic-metal-manufacturing/product/thermocouple-assembly)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: THERMOCOUPLE_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: ee647ea3
