Transparent Tubular Gauge Glass | Clear Borosilicate Gauge Glass Tube
Product Overview
Transparent tubular gauge glass is a standard solution for buyers who need a simple, readable liquid-level indicator. SCHOTT describes tubular gage glass as a product for accurate readings of pressure and water levels, and Emerson describes tubular glass gauges as externally mounted devices that provide direct visual verification of liquid level and optical inspection of fluid characteristics.
This product is widely used where the buyer wants a clear tubular gauge glass, transparent level gauge glass tube, or tubular gage glass for industrial service rather than a flat sight glass disc.
Typical Applications
Transparent tubular gauge glass is used on externally mounted level gauges for tanks, reservoirs, boilers, and flowmeters. The glass tube allows operators to read the meniscus directly and check fluid appearance visually.
Typical applications include:
- tanks and reservoirs
- liquid level monitoring
- boilers and steam service
- process vessels
- flowmeters and industrial measurement equipment
Material and Performance
Material Properties
| Property | Value | Source |
|---|---|---|
| Material family | Borosilicate glass 3.3 | |
| Material designation | DURAN® 8330 | |
| Density | 2.23 ± 0.02 g/cm³ | |
| Thermal expansion coefficient | 3.3 × 10⁻⁶/K | |
| Chemical resistance | High chemical durability / strong hydrolytic resistance | |
| Thermal shock resistance | High thermal shock resistance | |
| Optical quality | High optical quality / transparent |
Why Buyers Choose This Product
Advantages:
- clear, direct level reading;
- good chemical durability for corrosive service;
- wide availability of standard variants;
- multiple end finishes for different installation requirements.
Technical Specifications
Standard Product Data
| Parameter | Value | Source |
|---|---|---|
| Product type | Transparent tubular gauge glass | |
| Common aliases | Tubular gage glass / tubular glass gauge / clear gauge glass tube | |
| Material | borosilicate glass 3.3 | |
| OD range | 1/2″ OD to 1 1/2″ OD | |
| End finishes | Cut, ground, fire polished | |
| Pressure ratings | 90 to 600 psi, depending on end finish, diameter, and length required | |
| Temperature reference | Glass to 425°F (218°C) in a complete tubular glass gauge assembly | |
| Pressure service type | Low to medium pressure gauges | |
| Application scope | Tanks, reservoirs, boilers, flowmeters |
Common Size / Pressure Reference Table
| Variant | Typical Size | Working Pressure Reference | Notes |
|---|---|---|---|
| Standard tubular gage glass | 1/2″ OD to 1 1/2″ OD | 90–600 psi | Pressure depends on end finish, diameter, and length. |
| Heavy-duty service | 1/2″ OD to 1 1/2″ OD | Up to 600 psi | SCHOTT lists Heavy Wall and High Pressure variants in the family. |
| Low-to-medium pressure level gauge | Tubular glass assembly | Glass to 425°F (218°C) | Emerson lists this as a tubular glass gauge application. |
Quality Proof and Evidence
- inspection report
- dimensional check sheet
- thermal or pressure test record
- customer installation photo
- certificate or conformity document
FAQ
What is transparent tubular gauge glass used for?
It is used for direct visual verification of liquid level in tanks, reservoirs, boilers, and other process equipment.
What material is usually used?
The common material is DURAN® borosilicate glass 3.3, which is known for high chemical durability, low thermal expansion, and thermal shock resistance.
What sizes are available?
Published datasheets show an OD range from 1/2″ to 1 1/2″.
What is the pressure range?
SCHOTT lists pressure ratings from 90 to 600 psi, depending on end finish, diameter, and length.
What is the temperature reference?
In a complete tubular glass gauge assembly, Emerson lists the glass to 425°F (218°C).
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