---
title: "Sensor Head / Tube"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SENSOR_HEAD_TUBE"
  data_integrity_hash: "5e4ee74031c3bccc567acdac7d2af89f"
  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:SENSOR_HEAD_TUBE"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/sensor-head-tube.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/sensor-head-tube"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "1e-9 to 1000 mbar (1e-12 to 100 Pa)"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 1.1
    unit: "e"
    consequence: "Ion bombardment erosion at 1e-6 mbar, thermal oxidation of tungsten filament above 1e-3 mbar"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Water vapor condensation at 273 K dew point"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated Peltier cooling maintaining 283 K minimum operating temperature"
  - node_2:
      trigger: "Argon plasma formation at 13.56 MHz RF interference"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Double-shielded coaxial cable with 60 dB RF attenuation at 13-14 MHz"
bom_nodes:
  sensing-filamentelement:
    type: "component"
    urn: "URN:CNFX:ME:SENSING_FILAMENTELEMENT"
    interface_type: "physical-logic-coupled"
  tube-bodyhousing:
    type: "component"
    urn: "URN:CNFX:ME:TUBE_BODYHOUSING"
    interface_type: "physical-logic-coupled"
  electrical-feedthrough:
    type: "part"
    urn: "URN:CNFX:ME:ELECTRICAL_FEEDTHROUGH"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/sensor-head-tube.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "172b78c5c158c0a605cea32799d776704c6d1d23e33eafed6088618bb9a8a0ae"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Sensor Head / Tube

## 1. Technical Definition
The sensing element of a vacuum gauge that directly interacts with the vacuum environment to measure pressure.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **1e-9 to 1000 mbar (1e-12 to 100 Pa)**. Failure boundary: **1.1e-3 mbar (1.1e-4 Pa) for thermal conductivity gauges, 1e-6 mbar (1e-7 Pa) for cold cathode gauges**, Mechanism: **Ion bombardment erosion at 1e-6 mbar, thermal oxidation of tungsten filament above 1e-3 mbar**.

### 2.1 Analytical Physics Model
Governed by the **Combined Measurement Uncertainty**:

> **Primary Equation**: $u_c = \sqrt{\sum u_i^2}$  
> **Engineering Impact**: Defines the precision confidence interval for inspection.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| u_i | Standard Uncertainty components | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Water vapor condensation at 273 K dew point | 8 | Ceramic insulator surface leakage current exceeding 10 μA | Integrated Peltier cooling maintaining 283 K minimum operating temperature |
| Argon plasma formation at 13.56 MHz RF interference | 8 | Cathode sputtering rate exceeding 0.1 nm/hour | Double-shielded coaxial cable with 60 dB RF attenuation at 13-14 MHz |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Electrical Feedthrough](https://cnfx.com/llms/industry/electrical-equipment-manufacturing/product/electrical-feedthrough.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Vacuum Pump System**, **Signal Conditioning Electronics**, **Calibration Reference Standard**  
**Downstream Applications**: Vacuum Furnaces, Semiconductor Processing Equipment, Analytical Instrumentation  

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

### Q: What materials are used in vacuum gauge sensor heads/tubes?
**A**: Our sensor heads/tubes are constructed from durable materials including stainless steel for corrosion resistance, glass for transparency and chemical inertness, and ceramic for high-temperature stability in demanding industrial environments.

### Q: How does a sensor head/tube measure vacuum pressure?
**A**: The sensor head/tube contains a sensing filament/element that directly interacts with the vacuum environment. As pressure changes, the filament's electrical properties alter, allowing precise measurement of vacuum levels in machinery and equipment applications.

### Q: What are the main components of a vacuum gauge sensor head/tube?
**A**: Key components include the electrical feedthrough for signal transmission, the sensing filament/element that detects pressure changes, and the tube body/housing that protects internal components while maintaining vacuum integrity in industrial settings.

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

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Sensor Head / Tube](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/sensor-head-tube)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: SENSOR_HEAD_TUBE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 91773465
