Glass Level Gauge / Sight Glass Level Indicator
The Glass Level Gauge is a direct-reading liquid level measuring instrument designed for continuous visual monitoring of liquid levels in tanks, vessels, and pipelines. By utilizing a transparent glass tube or flat glass panel, operators can clearly observe the actual liquid level in real time, ensuring safe and reliable process control.
✔ Direct visual indication
✔ Simple structure, no power required
✔ Suitable for harsh industrial environments
Level Measuring Instruments Description
Glass Level Gauge-Product Features
1️⃣ Direct Visual Liquid Level Indication
The glass level gauge provides a true, real-time visual indication of the actual liquid level inside tanks and vessels. Unlike electronic sensors, it displays the liquid position directly through the sight glass, allowing operators to immediately identify level changes, foaming, or abnormal conditions.
2️⃣ Integrated Quick Shut-Off Safety Device
Designed with a built-in quick shut-off mechanism, the gauge automatically isolates the process in the event of glass breakage or leakage. This safety feature effectively prevents vapor or liquid escape, enhancing operator safety and minimizing process risks.
3️⃣ Robust & Practical Structural Design
The sight glass level gauge features a compact and well-engineered structure, ensuring easy installation on existing tanks or pipelines. Standard process connections allow for fast commissioning, while the modular design simplifies routine inspection and part replacement.
4️⃣ Low Maintenance & Cost-Effective Operation
With no power supply or signal components required, the glass level gauge offers long-term stable operation with minimal maintenance. The durable glass and metal components reduce downtime and spare part costs, making it an economical solution for continuous level monitoring.
Sight Glass Level Gauge-Applications / Industries
The glass plate liquid level gauge is widely used in various industrial systems where reliable and direct liquid level monitoring is required. Typical applications include:
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Chemical & Petrochemical Plants
Ideal for corrosive or hazardous liquids. Provides real-time visual monitoring of reaction tanks, storage vessels, and process systems. -
Boilers & Steam Systems
Ensures accurate water level observation in boiler drums and steam vessels. High-temperature and pressure-resistant design with integrated safety protection. -
Water Treatment Systems
Enables continuous monitoring of water levels in filtration, storage, and circulation systems. Simple structure allows easy installation and maintenance. -
Food & Pharmaceutical Processing
Supports observation of liquid levels in clean and sanitary environments. Compatible with hygienic media and easy to sanitize. -
Oil & Gas Storage and Transportation
Provides safe and reliable monitoring for oil tanks, fuel storage, and pipelines. Robust design ensures stable operation under varying pressures and temperatures.
Level Measuring Instruments Parameter
| Custom | Support OEM/ODM |
| Medium | liquid or material that is generally or slightly corroded |
| Measuring Range | 5m, 10m, 15m, 30m, 50m, 60m,120m |
| Transducer Material | Ceramic |
| Measurement Error | 0.5%. 1.0% |
| Accuracy | ±3mm (no wave calm water surface) |
| Resolution | 3~5mm or 0.1% (take large value) |
| Display Mode | LCD, parameters can be set through the panel buttons |
| Signal Output | 4~20mADC |
| Relay Output | 2 groups are optional, and the relay status is programmable |
| Working Temperature | -25~80 ℃ |
| Communication Interface | RS232, RS485/Modbus |
| Electrical Interface | M20*1.5, 1/2″PT |
| Explosion-proof Grade | ExiaIICT6Ga/ExdIICT6Gb |
| Protection level: | IP67 |
| Shell material: | engineering-plastics, aluminum alloy, SS304 |
| Ambient temperature: | (meter) -20-60 ℃; (sensor) -20~80 ℃ |
| Relative Humidity | 95% |
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What is a glass level gauge and how does it work?
A glass level gauge, also called a sight glass level indicator, allows direct visual monitoring of liquid levels in tanks and vessels. It works on the communicating vessel principle, where liquid in the gauge matches the level in the connected container, providing accurate, real-time observation without electrical signals.
What types of glass level gauges are available for industrial applications?
Industrial glass level gauges are available in transparent, reflex, and mirror-type configurations. Transparent gauges suit clear liquids, reflex types enhance visibility for steam or high-temperature media, and mirror-type gauges improve readability under low light or medium-pressure conditions.
Which industries commonly use sight glass level indicators?
Sight glass level indicators are widely used in chemical, petrochemical, boiler, water treatment, food, pharmaceutical, and oil & gas industries. They are ideal for medium- and low-pressure vessels requiring reliable visual monitoring of corrosive, high-temperature, or hazardous liquids.
How should a glass level gauge be installed and maintained?
The gauge is mounted via standard flanges or threaded connections. After pressure testing, valves should be opened gradually. Inspect periodically for leaks, and if the glass becomes contaminated, drain the medium safely before cleaning. Proper maintenance ensures stable performance and long service life.
How does the built-in safety protection mechanism function?
Modern glass plate liquid level gauges include a safety steel ball. If the glass breaks or vapor/liquid side pressure exceeds 0.3 MPa, the steel ball automatically seals the flow path, preventing medium leakage. This feature ensures safe operation in chemical, boiler, and industrial environments.
What are the main advantages of using a glass level gauge?
Glass level gauges offer direct, accurate, and real-time liquid level observation without electricity. They are durable, corrosion-resistant, and low-maintenance, with built-in safety features. Suitable for chemical plants, boilers, water treatment, and general industrial vessels, they provide reliable, long-term performance.
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