Glass Tube Level Gauge for Accurate Visual Level Measurement

A glass tube level gauge is a simple and reliable visual level indication device used to directly observe liquid levels in tanks, vessels, and industrial systems. By using a transparent glass tube connected to the process vessel, operators can clearly monitor real-time liquid levels without complex instrumentation.

We provide glass tube level gauges designed for stable performance, easy installation, and clear visibility in a wide range of industrial applications.
Glass Tube Level Gauge Structural Design

A glass tube level gauge features a simple and robust structure designed for direct visual level indication. The main components typically include:

Transparent glass tube
The glass tube is the core component, allowing operators to visually observe the liquid level. Borosilicate glass is commonly used for its good transparency, temperature resistance, and chemical stability.

Upper and lower process connections
These connections link the glass tube to the tank or vessel, ensuring the liquid level inside the tube matches the actual process level based on the communicating vessel principle.

Metal body and fittings
The body and fittings are usually made of carbon steel or stainless steel to provide mechanical support and corrosion resistance.

Sealing components
Gaskets and seals ensure leak-tight performance during operation.

This straightforward structure allows the glass tube level gauge to operate reliably with minimal maintenance requirements.
Model     INGT114
Recommended Center-to-Center Distance     300 mm, 500 mm, 800 mm, 1100 mm, 1400 mm, 1700 mm, 2000 mm (custom made available)
Indication Mode     Single color; Bi-color (red for vapor phase, green for liquid phase)
Material     Carbon steel; Stainless steel 304 / 316L; 1Cr18Ni9Ti; 0Cr18Ni9; 304 with PTFE lining
Nominal Pressure     PN6 – PN100 (×0.1 MPa) 304 + PTFE ≤ PN40
Working Temperature     Carbon steel ≤ 350 °C Stainless steel ≤ 450 °C 304 + PTFE ≤ 200 °C PP ≤ 100 °C
Drain Valve     Drain needle valve (customizable)
Vent Valve     Vent needle valve (customizable)
Process Connection (Flange)     DN20 / RF, HG/T 20592-09
Heating Steam Interface     ZG 1/2″ male screw thread
Heating Steam Pressure     ≤ 1.0 MPa
Electric Heating     Self-limiting temperature heating (not required for anticorrosive type)
Steel Ball Self-Closing Pressure     ≥ 0.3 MPa
Power Supply     24 V DC, 36 V AC
Ambient Temperature     –50 °C to +80 °C