---
title: "DEF Tank with Level Sensor"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:DEF_TANK_WITH_LEVEL_SENSOR"
  data_integrity_hash: "6a877059b4dc25afcb6a23f3917309fe"
  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:DEF_TANK_WITH_LEVEL_SENSOR"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/def-tank-with-level-sensor.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/def-tank-with-level-sensor"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-50°C temperature, 0-3 bar pressure, 32.5-35% urea concentration"
    unit: "L"
engineering_limits:
  max_safe_operating_point:
    value: 11
    unit: "°C"
    consequence: "Urea-water solution crystallization below freezing point causes sensor fouling and flow obstruction; thermal expansion coefficient mismatch between stainless steel (17.3×10⁻⁶/°C) and polypropylene (150×10⁻⁶/°C) creates stress fractures"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Urea crystallization at -11°C phase transition"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated PTC heating element maintaining tank wall at 15°C minimum with 500W/m² heat flux"
  - node_2:
      trigger: "Electrochemical corrosion from chloride ions &gt;25 ppm concentration"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Cathodic protection with -0.85V vs. Ag/AgCl reference electrode and epoxy-phenolic coating (5 mil thickness)"
bom_nodes:
  tank-body:
    type: "part"
    urn: "URN:CNFX:ME:TANK_BODY"
    interface_type: "physical-logic-coupled"
  level-sensor-assembly:
    type: "part"
    urn: "URN:CNFX:ME:LEVEL_SENSOR_ASSEMBLY"
    interface_type: "physical-logic-coupled"
  filler-neck:
    type: "component"
    urn: "URN:CNFX:ME:FILLER_NECK"
    interface_type: "physical-logic-coupled"
  mounting-brackets:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_BRACKETS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 14001:2015 - ENVIRONMENTAL MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 12285-1:2003 - WORKSHOP FABRICATED STEEL TANKS - PART 1: HORIZONTAL CYLINDRICAL SINGLE SKIN AND DOUBLE SKIN TANKS FOR THE UNDERGROUND STORAGE OF FLAMMABLE AND NON-FLAMMABLE WATER POLLUTING LIQUIDS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/def-tank-with-level-sensor.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "d18be5f7810c05e16f4aef83c1628b26040a8be133d2be99ae067b1b441d15d2"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: DEF Tank with Level Sensor

## 1. Technical Definition
A storage tank for Diesel Exhaust Fluid (DEF/AdBlue) equipped with an integrated level sensor to monitor fluid volume.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-50°C temperature, 0-3 bar pressure, 32.5-35% urea concentration**. Failure boundary: **Crystallization occurs at -11°C, sensor failure at &gt;85°C, tank rupture at &gt;6 bar pressure**, Mechanism: **Urea-water solution crystallization below freezing point causes sensor fouling and flow obstruction; thermal expansion coefficient mismatch between stainless steel (17.3×10⁻⁶/°C) and polypropylene (150×10⁻⁶/°C) creates stress fractures**.

### 2.1 Analytical Physics Model
Governed by the **Darcy-Weisbach Pressure Drop**:

> **Primary Equation**: $\Delta P = f \cdot \frac{L}{D} \cdot \frac{\rho v^2}{2}$  
> **Engineering Impact**: Critical for sizing CIP (Clean-In-Place) pump heads.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| f | Friction Factor | Engineering Constant |
| L | Pipe Length | Engineering Constant |
| v | Velocity | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Urea crystallization at -11°C phase transition | 8 | Level sensor capacitance measurement error exceeding ±5% accuracy due to dielectric constant change from 78.5 to 4.2 | Integrated PTC heating element maintaining tank wall at 15°C minimum with 500W/m² heat flux |
| Electrochemical corrosion from chloride ions &gt;25 ppm concentration | 8 | 316L stainless steel sensor probe pitting corrosion at &gt;0.1 mm/year penetration rate | Cathodic protection with -0.85V vs. Ag/AgCl reference electrode and epoxy-phenolic coating (5 mil thickness) |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Tank Body](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/tank-body.md) `(Standalone System)`
- [Level Sensor Assembly](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/level-sensor-assembly.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **DEF Filling Station**, **Automated Conveyor System**, **Quality Control Testing Equipment**  
**Downstream Applications**: Commercial Trucks, Passenger Vehicles, Agricultural Equipment  

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

### Q: What materials are used in the DEF tank construction?
**A**: The tank body is made from high-density polyethylene (HDPE) for chemical resistance, while the level sensor components are stainless steel for durability in DEF/AdBlue applications.

### Q: How does the integrated level sensor work?
**A**: The sensor continuously monitors DEF fluid volume and provides accurate readings to prevent running dry, ensuring proper SCR system operation and compliance with emissions regulations.

### Q: What components are included in the BOM?
**A**: The bill of materials includes: Tank Body (HDPE), Level Sensor Assembly (stainless steel), Filler Neck, and Mounting Brackets for secure installation in motor vehicle applications.

## 6. Manufacturing Compliance
- ISO 14001:2015 - ENVIRONMENTAL MANAGEMENT SYSTEMS
- DIN EN 12285-1:2003 - WORKSHOP FABRICATED STEEL TANKS - PART 1: HORIZONTAL CYLINDRICAL SINGLE SKIN AND DOUBLE SKIN TANKS FOR THE UNDERGROUND STORAGE OF FLAMMABLE AND NON-FLAMMABLE WATER POLLUTING LIQUIDS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: DEF Tank with Level Sensor](https://cnfx.com/industry/motor-vehicle-manufacturing/product/def-tank-with-level-sensor)**

### 🌐 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**: DEF_TANK_WITH_LEVEL_SENSOR | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 01217b0d
