Quartz Tube Bi-Color Level Gauge

The Quartz Tube Bi-Color Level Gauge is extensively applicable in fields such as petrochemical for monitoring the liquid levels in various medium and low-pressure containers, tanks, and vessels. This level gauge directly displays the liquid level using optical principles, showing red for gas and green for liquid, with a very distinct liquid level boundary. The gauge features a fluorescent bi-color display, making it suitable for long-distance observation at night.

Additionally, users can freely rotate the observation direction, benefiting from a large observation angle, wide viewing surface, and safe and reliable operation. The frost-proof bi-color level gauge is suitable for monitoring the liquid level of high-viscosity media in the petrochemical field. This gauge is equipped with a heating and insulation device, ensuring sensitive, clear, and accurate liquid level boundary display.

The working principle of the Quartz Tube Bi-Color Level Gauge is based on the reflection and refraction properties of light. The quartz tube inside the level gauge is illuminated by red and green light sources. When light passes through the liquid and gas media, the different refractive indices result in different reflection behaviors, forming a clear red and green boundary on the observation window. The red color represents the gas phase, and the green color represents the liquid phase. This simple and intuitive display allows users to easily read the liquid level height.

Quartz Tube Bi-Color Level Gauge (2)

  • High Precision: The quartz tube bicolor level gauge boasts extremely high measurement accuracy, allowing real-time monitoring of liquid level changes to meet the strict requirements of industrial site level measurement.
  • High Temperature and Pressure Resistance: Made with high-quality quartz glass and stainless steel, it can operate stably in high-temperature and high-pressure environments, making it suitable for various demanding conditions.
  • Strong Corrosion Resistance: Both the quartz tube and metal components are specially treated to provide excellent corrosion resistance, suitable for various acidic, alkaline, and other corrosive media.
  • Intuitive Display:The red and green bicolor display of the liquid level is clear and intuitive, easy to identify, and operators can master it proficiently without complex training.
  • Easy Installation and Maintenance:With a simple structure and standardized interface design, it is easy to install and maintain, reducing downtime and maintenance costs.
  • Wide Application Range:The quartz tube bicolor level gauge is suitable for liquid level measurement in boilers, storage tanks, chemical equipment, and various other containers. Whether in high-temperature steam environments or corrosive media environments, the level gauge provides reliable level measurement.
  • Power Industry: Boiler level monitoring, steam system level control, water treatment equipment level measurement.
  • Petrochemical Industry: Reactor and storage tank level monitoring, chemical reagent level control.
  • Metallurgical Industry: Cooling system level measurement, smelting equipment level control.
  • Food and Pharmaceutical Industry: Beverage production level monitoring, pharmaceutical production level control, hygienic liquid storage tank level measurement.
  • Environmental Protection Industry: Wastewater treatment system level monitoring, wastewater storage tank level control.
Name Quartz Tube Water Level Gauge
Model B43H-64
Nominal Pressure 1.6~6.4(MPa)
Nominal Diameter 20~25(mm)
Nominal Length 440~600(mm)
Medium Temperature ≤250℃
Main Material Q235-A Carbon Steel

The design of the quartz tube bicolor level gauge is sophisticated and functional, mainly composed of the following parts:

  • Upper Valve (Steam Valve) and Lower Valve (Water Valve)

These are a pair of quick combination valves with manual rapid full open and close functions. Each valve contains a safety valve seat and a safety ball. When the quartz tube suddenly bursts, the impact of high-pressure steam and water pushes the safety ball towards the safety valve seat, automatically closing the upper and lower channels of the level gauge body, effectively preventing leaks and accidents.

  • Gauge Body

The core component of the level gauge, typically made of high-temperature and pressure-resistant materials, houses the quartz tube. The quartz tube has high transparency, clearly displaying the liquid level, and its bicolor design makes level changes easy to discern.

  • Drain Valve

Used for periodically discharging impurities and debris from the level gauge to ensure cleanliness and normal operation.

Balance Tube: The balance tube’s function is to achieve pressure balance, allowing the safety ball to reset itself after manually closing the quick valves (upper and lower valves). This design effectively prevents false water levels and ensures the accuracy and reliability of the level gauge readings.

  • Safety Mechanism

When the quartz tube bursts, the safety ball, driven by the impact of high-pressure steam and water, moves towards the safety valve seat, automatically closing the channels to prevent liquid leakage. This mechanism relies on the weight of the safety ball and the pressure balance tube, ensuring safety without immediate manual intervention in the event of an accident.

  • Visual Display

The quartz tube’s bicolor design, usually red for the steam area and green for the water area, allows for clear and intuitive observation and judgment of the liquid level height and changes through color variation.

Other Related Products

What Are the Differences Between Glass Tubes and Quartz Tubes

In various industrial and laboratory applications, glass tubes and quartz tubes play crucial roles. While they share some similarities, they have significant differences in material composition, physical and chemical properties, and specific uses. This article will explore the differences between glass tubes and quartz tubes, and analyze their advantages, disadvantages, and suitable applications.

1. Different Materials

Glass Tubes

As the name suggests, glass tubes are made from glass. Glass is an amorphous inorganic material formed by melting silica (SiO2) and other oxides. It has excellent transparency and formability, and can be manufactured into tubes of various shapes and sizes using different processes. Common types of glass include soda-lime glass, borosilicate glass, and lead glass.

Quartz Tubes

Quartz tubes, on the other hand, are made from pure quartz material. Quartz, which is also primarily composed of silicon dioxide (SiO2), can have either a crystalline or amorphous structure, commonly seen as fused quartz and crystalline quartz. Quartz materials have high purity and excellent physical and chemical properties, making quartz tubes perform exceptionally well in certain special applications.

2. Different Properties

Properties of Glass Tubes

Glass tubes have the following main properties:

  • High Transparency

Glass tubes have very high transparency, allowing clear observation of the flow of liquids or gases inside.

  • Easy to Form

Glass softens at high temperatures and can be processed into various complex shapes through blowing, drawing, and other methods.

  • Good Chemical Stability

Glass is resistant to most acids and salts but has poor resistance to certain special chemicals like hydrofluoric acid.

  • Moderate Heat Resistance

Ordinary glass tubes can withstand temperatures up to about 500℃, while borosilicate glass tubes can withstand up to 800℃.

  • Fragility

Glass is relatively brittle and fragile, requiring careful handling during use.

Properties of Quartz Tubes

Quartz tubes have the following notable properties:

  • Extremely High Heat Resistance

Quartz tubes can withstand extremely high temperatures, with fused quartz able to handle temperatures over 1600℃, making them advantageous in high-temperature environments.

  • Excellent Corrosion Resistance

Quartz material is highly resistant to most chemicals, including strong acids and bases, and can be used long-term in harsh chemical environments.

  • High Hardness and Strength

Quartz has a Mohs hardness of 7, much higher than ordinary glass, giving quartz tubes better wear resistance and impact resistance.

  • Low Thermal Expansion Coefficient

Quartz tubes have a very low thermal expansion coefficient, making them resistant to cracking or deforming under drastic temperature changes.

  • High Purity and Good Optical Properties

Quartz tubes have high purity and excellent optical properties, widely used in optical instruments and high-purity chemical experiments.

3. Different Uses

Due to their differences in material and properties, glass tubes and quartz tubes have different uses in practical applications.

Uses of Glass Tubes

Glass tubes are widely used in the following fields:

  • Laboratory Instruments

Glass tubes are commonly used in physical and chemical experiments at low temperatures, such as in chemical reactors, condensers, and test tubes.

  • Measuring Instruments

Glass tubes are widely used in ordinary measuring instruments like flow meters, level gauges, and thermometers due to their transparency and formability.

  • Medical Equipment

Glass tubes are also used to make some medical equipment, such as syringes and medicine bottles, valued for their chemical stability and transparency.

  • Everyday Items

Some everyday items, such as light bulbs, beverage bottles, and glass straws, are also made from glass materials.

Uses of Quartz Tubes

Quartz tubes are more often used in environments requiring high temperatures and high purity:

  • High-Temperature Equipment

Quartz tubes are commonly used in high-temperature furnaces, heaters, and thermocouple protection tubes due to their excellent heat resistance.

  • Chemical Industry

n the chemical industry, quartz tubes are used in strong acid, strong base, and high-temperature chemical reactors due to their superior corrosion resistance and high purity.

  • Optical Instruments

The excellent optical properties of quartz make quartz tubes used in some optical instruments, such as optical fibers, optical windows, and lenses.

  • Semiconductor Industry

In semiconductor manufacturing, quartz tubes are used as diffusion tubes, doping tubes, and other devices requiring high purity and high-temperature processing.

  • Other High-Tech Fields

In fields like laser technology and aerospace, the high-performance characteristics of quartz tubes make them indispensable materials.


Glass tubes and quartz tubes have significant differences in material, properties, and uses. Glass tubes, with their good transparency, ease of forming, and chemical stability, are widely used in laboratories and ordinary instruments. However, they have relatively weaker heat and corrosion resistance and are fragile. Quartz tubes, with their extremely high heat resistance, corrosion resistance, and hardness, can stably work in high-temperature, high-pressure, and strong acid-base environments, making them widely used in high-temperature equipment, the chemical industry, and high-tech fields. Understanding the properties and uses of these two materials helps in selecting the appropriate tubes for different experimental and industrial needs.

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