Industry-Verified Manufacturing Data (2026)

Level Gauge / Sight Glass

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Level Gauge / Sight Glass used in the Chemical Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Level Gauge / Sight Glass is characterized by the integration of Transparent Tube / Window and Gasket / Seal. In industrial production environments, manufacturers listed on CNFX commonly emphasize Tempered Borosilicate Glass construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A transparent window or gauge used to visually monitor the liquid level inside a vessel or separator.

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Product Specifications

Technical details and manufacturing context for Level Gauge / Sight Glass

Definition
A critical component of a Vapor-Liquid Separator that provides a direct visual indication of the interface level between the liquid and vapor phases within the vessel. It allows operators to monitor separation efficiency, control liquid drainage, and ensure safe operating levels.
Working Principle
The sight glass or gauge is mounted on the side of the separator vessel. The transparent material (typically glass or a polymer) allows light to pass through, making the liquid level inside the vessel visible from the outside. In gauges with markings, the level is read against a calibrated scale.
Common Materials
Tempered Borosilicate Glass, Polycarbonate, Stainless Steel (housing)
Technical Parameters
  • The diameter and length of the sight glass tube or the viewing area dimensions for a flat glass assembly. (mm) Customizable
Components / BOM
  • Transparent Tube / Window
    Provides the visual medium to see the liquid level.
    Material: Tempered Borosilicate Glass or Polycarbonate
  • Gasket / Seal
    Creates a pressure-tight seal between the glass and the metal housing.
    Material: PTFE, Viton, or EPDM
  • End Fitting / Housing
    Metal assembly that connects the sight glass to the vessel and protects the glass.
    Material: Stainless Steel (304/316)
  • Protective Guard (optional)
    A metal cage or shield to protect the glass from physical impact.
    Material: Stainless Steel
Engineering Reasoning
0-150°C temperature, 0-10 bar pressure, 0.1-1000 cP viscosity
Glass fracture at 200 MPa tensile stress, seal failure at 15 bar differential pressure, opacity at 150°C thermal shock ΔT
Design Rationale: Brittle fracture from thermal expansion mismatch (borosilicate α=3.3×10⁻⁶/K vs steel α=12×10⁻⁶/K), seal extrusion at yield stress σ_y=25 MPa
Risk Mitigation (FMEA)
Trigger Caustic stress corrosion cracking at pH>12
Mode: Glass fracture propagation from surface flaws exceeding critical crack length a_c=0.1 mm
Strategy: Chemical tempering with potassium ion exchange creating 100 MPa compressive surface layer
Trigger Cyclic pressure pulsation at 5-20 Hz resonance
Mode: Gasket fatigue failure at 10⁶ cycles with Δσ=50 MPa stress amplitude
Strategy: Damped mounting with viscoelastic isolators (loss factor η=0.3) and pressure snubbers

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Level Gauge / Sight Glass.

chemical process sight glass industrial liquid level gauge borosilicate glass level indicator stainless steel sight glass housing high-pressure level gauge chemical

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Vapor-Liquid Separator
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Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 25 bar (standard), up to 100 bar with reinforced designs
other spec: Flow velocity < 2 m/s to prevent erosion, slurry concentration < 30% solids by weight for clear visibility
temperature: -20°C to 200°C (standard borosilicate glass), up to 400°C with quartz glass
Media Compatibility
✓ Water and aqueous solutions ✓ Hydrocarbon liquids (oil, fuels) ✓ Chemical process fluids (acids, bases at moderate concentrations)
Unsuitable: Hydrofluoric acid or high-concentration caustic solutions (rapid glass corrosion)
Sizing Data Required
  • Vessel/pipe diameter and connection type (flange size, thread specification)
  • Required visible level range (minimum to maximum measurement height)
  • Process fluid properties (density, viscosity, corrosiveness)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Glass Cracking or Shattering
Cause: Thermal shock from rapid temperature changes, mechanical stress from improper installation or external impacts, or pressure surges exceeding design limits.
Leakage at Seals or Gaskets
Cause: Deterioration of sealing materials due to chemical attack from process fluids, aging/embrittlement from temperature cycling, or improper torque during assembly leading to compression loss.
Maintenance Indicators
  • Visible cracks, chips, or clouding/opacity in the glass that obscures level indication
  • Fluid weeping or dripping around the glass seals, gaskets, or body connections
Engineering Tips
  • Install protective shields or guards to prevent mechanical damage and consider using armored or double-pane glass designs for high-pressure/temperature services
  • Implement a routine inspection schedule for seal integrity and use compatible gasket materials (e.g., PTFE, Grafoil) resistant to the specific process fluid's chemical and thermal properties

Compliance & Manufacturing Standards

Reference Standards
ISO 24450:2020 (Level gauges and sight glasses) ASME B40.100 (Pressure Gauges and Gauge Attachments) DIN 7080 (Sight glasses for pressure vessels)
Manufacturing Precision
  • Bore diameter: +/-0.05mm
  • Parallelism of sealing surfaces: 0.02mm
Quality Inspection
  • Hydrostatic pressure test (1.5x rated pressure)
  • Visual inspection for clarity and defect-free glass

Factories Producing Level Gauge / Sight Glass

Verified manufacturers with capability to produce this product in China

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✓ 92% Supplier Capability Match Found

P Project Engineer from United States Feb 14, 2026
★★★★★
"Reliable performance in harsh Chemical Manufacturing environments. No issues with the Level Gauge / Sight Glass so far."
Technical Specifications Verified
S Sourcing Manager from United Arab Emirates Feb 11, 2026
★★★★★
"Testing the Level Gauge / Sight Glass now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
P Procurement Specialist from Australia Feb 08, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

9 sourcing managers are analyzing this specification now. Last inquiry for Level Gauge / Sight Glass from Brazil (13m ago).

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Frequently Asked Questions

What materials are best for corrosive chemical applications?

Tempered borosilicate glass offers excellent chemical resistance for most corrosive fluids, while polycarbonate provides impact resistance for less aggressive chemicals.

How do I maintain and clean a sight glass?

Regular visual inspection for cracks or clouding, gentle cleaning with compatible solvents, and periodic gasket replacement ensure optimal performance and safety.

What pressure ratings are available for chemical level gauges?

Standard models typically handle 150-300 PSI, with high-pressure variants available up to 1000+ PSI depending on housing material and design specifications.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Chemical Manufacturing sector.

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