Gauge Glass: Temperature Range -20°C to 400°C

Component Specifications

Definition

A precision-engineered glass component designed for liquid level gauges that provides a clear, durable viewing window to monitor fluid levels in pressurized or non-pressurized industrial systems. It must withstand thermal expansion, chemical exposure, and mechanical stress while maintaining optical clarity and structural integrity.

Working Principle

Operates on the principle of hydrostatic equilibrium where the liquid level inside the gauge glass matches the level in the connected vessel. The transparent glass allows visual observation of the liquid interface, with some designs incorporating colored bands or magnetic indicators for enhanced visibility.

Materials

Borosilicate glass (most common), tempered soda-lime glass, quartz glass for high-temperature applications, or armored glass with protective coatings. Material selection depends on pressure rating, temperature range, and chemical compatibility.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	3-25 mm
Transparency	>90% light transmission
Surface Finish	Polished to optical standards
Pressure Rating	Up to 25 MPa
Temperature Range	-20°C to 400°C
Chemical Resistance	pH 0-14 compatible

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 3585, DIN 7080, ASME B31.1, EN 1595

Parent Products

This component is used in the following industrial products

Liquid Level Gauge

A measurement device that indicates the level of liquid CO₂ within a storage tank.

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Engineering Analysis

Risks & Mitigation

Glass fracture under pressure
Chemical corrosion reducing visibility
Thermal shock cracking
Improper installation causing leaks
Reduced transparency over time

FMEA Triads

Trigger: Thermal stress from rapid temperature changes
Failure: Glass cracking or shattering
Mitigation: Use borosilicate glass with low thermal expansion coefficient, implement gradual temperature changes, install protective shields

Trigger: Chemical attack from process fluids
Failure: Surface etching and reduced transparency
Mitigation: Select chemically resistant glass grades, apply protective coatings, implement regular cleaning protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5 mm thickness variation, ±1° angular deviation, surface flatness within 0.02 mm

Test Method

Hydrostatic pressure testing per ASME standards, thermal shock testing, chemical resistance verification, optical clarity measurement

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Gauge Glass

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Aohong Special Glass Manufacturing Co., LTD.

Hebei, CN

Also makes: Level Gauge, Viewing Port

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “DIN 7081 Gauge Glass”
View source page ↗ hsahglass.com · recorded 2026-09-07

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Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between tubular gauge glass and flat gauge glass?

Tubular gauge glass uses cylindrical glass tubes for direct level reading, while flat gauge glass consists of flat glass plates with gaskets, offering better pressure resistance and safety features.

How often should gauge glass be replaced?

Replacement intervals depend on service conditions: typically 1-3 years for continuous service, or immediately if clouding, cracking, or etching occurs. Regular inspection for scratches and chemical attack is essential.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Gauge Glass