Product Overview
This product is also known as standard tubular gauge glass, sight tube, level gauge glass tube, glass level tube, and transparent gauge tube. Published tubular-gauge product information shows the tube is used for liquid-level monitoring in tanks, vessels, boilers, and small-scale industrial systems. It is the standard choice for clear reading in low-pressure service, with size selection based on outside diameter, wall thickness, and length.
Typical Applications
Standard tubular gauge glass is used in direct-reading level gauges for tanks, reservoirs, boilers, and process vessels where the operator needs a simple visual level line. Published gauge literature describes tubular type level gauges as the simplest direct-reading level apparatus for low-pressure service, with service limits depending on the gauge design and tube selection.
Material and Specification
The standard tubular format is commonly made from 3.3 borosilicate glass, chosen for chemical resistance and low thermal expansion. Published product information states that the tube ends are cut with diamond equipment to support sealing and reduce sharp edges, and that transparent or red-line versions may be supplied depending on the required reading style.
Technical Parameters
| Item | Specification |
|---|---|
| Material | 3.3 borosilicate glass |
| Product type | Standard tubular gauge glass / tubular sight glass / sight tube |
| Main function | Direct liquid-level indication |
| Common finish | Cut ends or flame-polished ends |
| Available tube style | Transparent tube, red-line tube |
| Common service | Low-pressure level gauge applications |
| Selection factors | Outside diameter, wall thickness, length |
| Chemical property | Good chemical resistance |
| Thermal property | Low thermal expansion coefficient |
Common Sizes
| Size Item | Published Range / Common Size |
|---|---|
| Outside diameter | 3/16″ to 1-1/2″ |
| Wall thickness | 3/64″ to 1/2″ |
| Length | 1″ to 145″ |
| Common diameters | 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 7/8″, 1″ |
| Common length option | Up to 2 metres |
| Special length option | Longer options available on request |
| End preparation | Cut or flame-polished |
Advantages
Standard tubular gauge glass is a practical choice when the application needs simple level reading, clear visibility, and a widely available tube format. Borosilicate construction supports chemical resistance and low thermal expansion, while the standard cylindrical form makes replacement and size matching straightforward.
