---
title: "Sight Glass"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SIGHT_GLASS"
  data_integrity_hash: "98ab1750e4853a35a2ef42a5dfe5b2d9"
  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:SIGHT_GLASS"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/sight-glass.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/sight-glass"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-25 bar at 20-120°C for borosilicate glass, 0-40 bar at -20-80°C for polycarbonate"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 30
    unit: "bar"
    consequence: "Brittle fracture due to surface microcracks (Griffith theory) propagating under tensile stress exceeding fracture toughness (K_IC=0.75 MPa·m^0.5 for borosilicate)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Thermal shock ΔT&gt;80°C creating surface tensile stress &gt;35 MPa"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Annealed borosilicate glass with thermal expansion coefficient 3.3×10^-6/°C and graded thermal transition gaskets"
  - node_2:
      trigger: "Cavitation bubbles collapsing at 500-1500 bar creating microjet impact"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Hardened sapphire viewing window with Vickers hardness 1800-2000 HV and anti-cavitation flow design"
bom_nodes:
  transparent-panel:
    type: "component"
    urn: "URN:CNFX:ME:TRANSPARENT_PANEL"
    interface_type: "physical-logic-coupled"
  sealing-gasket:
    type: "component"
    urn: "URN:CNFX:ME:SEALING_GASKET"
    interface_type: "physical-logic-coupled"
  mounting-frame:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_FRAME"
    interface_type: "physical-logic-coupled"
  protective-guard-optional:
    type: "component"
    urn: "URN:CNFX:ME:PROTECTIVE_GUARD_OPTIONAL"
    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/sight-glass.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "5b3d41821bffa5bf533224ecb032eeb9ef2fb62f9a56db775270aec94375ef61"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Sight Glass

## 1. Technical Definition
A transparent window installed on a liquid reservoir to allow visual inspection of fluid level, color, clarity, and flow without opening the vessel.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-25 bar at 20-120°C for borosilicate glass, 0-40 bar at -20-80°C for polycarbonate**. Failure boundary: **Glass: 30 bar internal pressure causing tensile stress &gt;70 MPa; Polycarbonate: 50 bar causing yield stress &gt;62 MPa**, Mechanism: **Brittle fracture due to surface microcracks (Griffith theory) propagating under tensile stress exceeding fracture toughness (K_IC=0.75 MPa·m^0.5 for borosilicate)**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Thermal shock ΔT&gt;80°C creating surface tensile stress &gt;35 MPa | 8 | Radial crack propagation from sealing edge | Annealed borosilicate glass with thermal expansion coefficient 3.3×10^-6/°C and graded thermal transition gaskets |
| Cavitation bubbles collapsing at 500-1500 bar creating microjet impact | 8 | Surface pitting erosion at 0.1-10 μm/material loss per cycle | Hardened sapphire viewing window with Vickers hardness 1800-2000 HV and anti-cavitation flow design |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Pressure Vessel**, **Fluid Level Sensor**, **Process Control System**  
**Downstream Applications**: Chemical Reactors, Pharmaceutical Mixing Tanks, Food Processing Equipment  

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

### Q: What materials are best for sight glass in corrosive environments?
**A**: Borosilicate glass offers excellent chemical resistance for corrosive fluids, while polycarbonate provides impact resistance. Stainless steel frames ensure durability in harsh conditions.

### Q: How do I install a sight glass on existing equipment?
**A**: Installation requires proper sealing with gaskets and secure mounting frames. Ensure compatibility with vessel pressure/temperature ratings and consider optional protective guards for safety.

### Q: Can sight glasses handle high-pressure applications?
**A**: Yes, tempered glass and polycarbonate sight glasses with reinforced frames are rated for high-pressure systems. Always verify specifications match your operating conditions.

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

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Sight Glass](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/sight-glass)**

### 🌐 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**: SIGHT_GLASS | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 55860b12
