Introduction

Bi-colour quartz tube level gauges are advanced visual level indication devices designed for high-pressure and high-temperature applications where standard glass level gauges are not suitable. By combining bi-colour optical indication with a quartz tube, these level gauges offer exceptional durability, clarity, and safety for demanding industrial environments.

In industries such as power generation, petrochemical processing, and boiler systems, bi-colour quartz tube level gauges are widely used to provide reliable liquid level monitoring under extreme operating conditions.

What Are Bi-Colour Quartz Tube Level Gauges?

Bi-colour quartz tube level gauges use a high-strength quartz tube as the primary viewing element instead of conventional borosilicate glass. The gauge integrates an optical system that displays liquid and vapor phases in two distinct colors, typically green for liquid and red for vapor.

The use of quartz glass significantly improves resistance to thermal shock, pressure, and chemical attack, making bi-colour quartz tube level gauges suitable for critical applications.

Working Principle of Bi-Colour Quartz Tube Level Gauges

The working principle of bi-colour quartz tube level gauges is based on optical refraction and light absorption.

• When liquid is present inside the quartz tube, light refraction causes the liquid phase to appear green.

• When vapor or gas is present, the optical path changes and the vapor phase appears red.

This dual-color indication allows operators to instantly distinguish between liquid and vapor levels, even at long viewing distances or under poor lighting conditions.

Compared with transparent quartz tube level gauges, bi-colour designs provide higher readability and reduce the risk of misinterpretation.

Why Use Quartz Tube in Bi-Colour Level Gauges?

The quartz tube is the key component that differentiates bi-colour quartz tube level gauges from standard glass level gauges.

Advantages of Quartz Tube Material

1. High pressure resistance
   Quartz glass withstands significantly higher pressures than conventional glass.

2. High temperature tolerance
   Suitable for continuous operation at elevated temperatures.

3. Excellent thermal shock resistance
   Reduces the risk of cracking during rapid temperature changes.

4. Superior chemical stability
   Resistant to corrosion from aggressive process fluids.

These properties make bi-colour quartz tube level gauges ideal for extreme service conditions.

Typical Applications of Bi-Colour Quartz Tube Level Gauges

Bi-colour quartz tube level gauges are commonly used in the following applications:

High-Pressure Boilers

Installed on boiler drums or level columns to provide accurate water level indication under high-pressure steam conditions.

Power Plants

Used in power generation systems where reliability and safety are critical.

Petrochemical and Chemical Processing

Suitable for pressurized vessels containing high-temperature or corrosive fluids.

High-Temperature Pressure Vessels

Provides stable visual indication where electronic instruments may be unreliable.

Technical Specifications of Bi-Colour Quartz Tube Level Gauges

Below is a typical technical specification table suitable for engineering reference.

Typical Technical Parameters

Advantages of Bi-Colour Quartz Tube Level Gauges

Compared with standard bi-colour glass level gauges, bi-colour quartz tube level gauges offer several key advantages:

• Enhanced safety under extreme pressure and temperature

• Clear and stable color indication

• Longer service life

• Reduced risk of glass failure

• Suitable for critical and continuous-duty applications

These advantages make them a preferred solution in high-risk industrial systems.

Bi-Colour Quartz Tube Level Gauges vs Other Level Gauge Types

Comparison Overview

For extreme operating conditions, bi-colour quartz tube level gauges provide the highest level of reliability.

Installation Guidelines for Bi-Colour Quartz Tube Level Gauges

Proper installation is essential to ensure safe operation.

• Install vertically to ensure accurate level indication.

• Use appropriate isolation valves for maintenance.

• Avoid mechanical stress on the quartz tube.

• Verify operating limits before commissioning.

• Perform pressure and leak testing after installation.

Correct installation significantly extends the service life of bi-colour quartz tube level gauges.

Maintenance and Safety Considerations

Although bi-colour quartz tube level gauges are designed for durability, routine inspection is recommended.

Maintenance Tips

• Regularly inspect the quartz tube surface.

• Clean optical surfaces to maintain color clarity.

• Check seals and bolts for wear.

Safety Practices

• Always depressurize the system before maintenance.

• Use protective shields where required.

• Follow applicable pressure vessel and safety standards.

How to Select Bi-Colour Quartz Tube Level Gauges

When selecting bi-colour quartz tube level gauges, consider:

1. Operating pressure and temperature

2. Process fluid characteristics

3. Required visible length

4. Installation location

5. Applicable industry standards

Selecting the correct model ensures reliable performance and long-term safety.

Conclusion

Bi-colour quartz tube level gauges provide a high-performance solution for visual level indication in extreme industrial environments. Their combination of quartz tube strength and bi-colour optical indication ensures accurate, reliable, and safe level monitoring.

For applications involving high pressure, high temperature, or critical safety requirements, bi-colour quartz tube level gauges are an optimal choice.