---
title: "Sight Glass/Level Indicator"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SIGHT_GLASSLEVEL_INDICATOR"
  data_integrity_hash: "3080f5026fb53f19534343cce84dbc1f"
  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_GLASSLEVEL_INDICATOR"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/sight-glasslevel-indicator.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/sight-glasslevel-indicator"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-1.5 bar differential pressure, -20°C to 120°C temperature range"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 2.1
    unit: "bar"
    consequence: "Borosilicate glass thermal expansion coefficient mismatch (3.3×10⁻⁶/°C) with metal housing (11.5×10⁻⁶/°C) creates stress exceeding 70 MPa tensile strength at boundaries"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Coolant chemical degradation forming hydrofluoric acid (pH&lt;3)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Borosilicate glass with 7% zirconia coating for chemical resistance to pH 1-14 range"
  - node_2:
      trigger: "Mechanical vibration at 85 Hz resonance frequency"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Isolation mounting with 40 Shore A silicone gaskets and 25 Hz vibration dampeners"
bom_nodes:
  transparent-window:
    type: "component"
    urn: "URN:CNFX:ME:TRANSPARENT_WINDOW"
    interface_type: "physical-logic-coupled"
  sealing-gasket:
    type: "component"
    urn: "URN:CNFX:ME:SEALING_GASKET"
    interface_type: "physical-logic-coupled"
  mounting-flange:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_FLANGE"
    interface_type: "physical-logic-coupled"
  graduation-markings:
    type: "component"
    urn: "URN:CNFX:ME:GRADUATION_MARKINGS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/sight-glasslevel-indicator.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "94d197b2454824359164278f2b4fc24ad69fbfb46a045ba802fce3b36f0f46a8"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Sight Glass/Level Indicator

## 1. Technical Definition
A transparent window or gauge that allows visual monitoring of coolant level within a reservoir.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-1.5 bar differential pressure, -20°C to 120°C temperature range**. Failure boundary: **Glass fracture at 2.1 bar differential pressure or 150°C thermal shock gradient**, Mechanism: **Borosilicate glass thermal expansion coefficient mismatch (3.3×10⁻⁶/°C) with metal housing (11.5×10⁻⁶/°C) creates stress exceeding 70 MPa tensile strength at boundaries**.

### 2.1 Analytical Physics Model
Governed by the **Rayleigh Resolution Criterion**:

> **Primary Equation**: $d = \frac{0.61 \lambda}{NA}$  
> **Engineering Impact**: Defines the theoretical limit of machine vision systems.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| \lambda | Wavelength | Engineering Constant |
| NA | Numerical Aperture | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Coolant chemical degradation forming hydrofluoric acid (pH&lt;3) | 8 | Glass surface etching reducing transparency below 70% light transmission | Borosilicate glass with 7% zirconia coating for chemical resistance to pH 1-14 range |
| Mechanical vibration at 85 Hz resonance frequency | 8 | Gasket seal fatigue causing 0.1 mm/s coolant leakage | Isolation mounting with 40 Shore A silicone gaskets and 25 Hz vibration dampeners |

## 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**: **Coolant Reservoir**, **Coolant Pump**, **Coolant Filtration System**  
**Downstream Applications**: CNC Machining Centers, Industrial Hydraulic Systems, Power Generation Turbines  

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

### Q: What materials are best for sight glasses in high-temperature applications?
**A**: Tempered glass is ideal for high-temperature environments due to its thermal resistance, while polycarbonate offers impact resistance for lower temperature applications.

### Q: How do I install a sight glass on my machinery coolant reservoir?
**A**: Install using the mounting flange with a proper sealing gasket to prevent leaks. Ensure the transparent window is clean and graduation markings are visible for accurate level reading.

### Q: Can sight glasses be customized for specific machinery applications?
**A**: Yes, sight glasses can be customized with different materials (acrylic, polycarbonate, tempered glass), sizes, and graduation markings to match specific reservoir dimensions and monitoring needs.

## 6. Manufacturing Compliance

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

### 🌐 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_GLASSLEVEL_INDICATOR | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: a2fd170d
