Catalog
Circular Sight Glass — Quartz (Fused Silica)
Quartz (fused silica) circular sight glasses excel in hightemperature environments due to their superior clarity and resilience to thermal shock. Their ability to withstand rapid temperature changes makes them ideal for maintaining visibility under extreme temperature conditions and provide a reliable process monitoring option in applications such as furnaces, boilers and reactors.
Quartz sight glass ensures a clear, unobstructed view in high-temperature applications that exceed the operating parameters of other materials like borosilicate or soda lime.
Due to the extremely high temperature resistance of quartz glass, it cannot be tempered and, as a result, demonstrates a lower resistance to pressure than its tempered borosilicate and soda lime equivalents. However, the difference in pressure rating can be mitigated by increasing the thickness of the quartz glass used in a given assembly.
Specifications
| Glass Type | Quartz (Fused Silica) |
|---|---|
| Maximum Diameter | 350mm |
| Minimum Thickness | 3mm |
| Maximum Thickness | 35mm |
| Max short-term temp | 1200°C (2192°F) |
| Thermal shock resistance | 480 K |
| Max working pressure | Contact for details |
| Expansion Coefficient | 9.17 x 10-6K-1 |
| Hydrolytic Class | Class 4 |
TOLERANCES
| TOLERANCES |
|---|
| DIAMETER (d) |
Specifications
| 10 ≤ t ≤ 20mm | 20mm < t |
|---|---|
| + 0.5mm - 0.25mm | + 0.8mm - 0.4mm |
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FAQ
How does Zight ensure the quality and safety of its Circular Sight Glasses and how does Zight Glasses behave against german-made alternatives?
Zight adheres to strict quality control standards, including compliance with DIN 7080 norms for tempered borosilicate and soda lime glasses. Each sight glass undergoes rigorous testing for material integrity, defect tolerance, and mechanical strength before it is shipped. Quartz sight glasses , while not tempered, also meet the highest standards for defect control and are inspected thoroughly to ensure they meet the required specifications.
How do I determine the appropriate thickness for my Circular Sight Glass?
The thickness of the sight glass is determined based on several factors, including the operating pressure, temperature, and the diameter of the glass. The larger the diameter or the higher the pressure and temperature, the thicker the glass needs to be to ensure safety and reliability. Zight follows DIN 7080 standards, which provide specific guidelines for thickness based on these factors. For precise calculations, consulting with a Zight representative or using industry-standard calculation tools is recommended.
How is the maximum pressure resistance of a Circular Sight Glass determined?
The maximum pressure resistance is determined by the thickness, material, and diameter of the sight glass, as well as the operating temperature. Zight sight glasses comply with DIN 7080, which offers a standard method for calculating the pressure limits based on these parameters. For high-pressure applications, tempered borosilicate or quartz sight glasses are preferred due to their superior mechanical strength.
Are there limitations on the size of Circular Sight Glasses that Zight can manufacture?
While Zight offers a wide range of standard sizes, we also provide custom manufacturing services. There are practical limitations based on the material and the intended application, but our engineering team can work with you to determine the best solution for your needs. Contact us at www.zight.us for specific inquiries about size limitations and custom orders.
How does the sealing method affect the performance of a Circular Sight Glass?
Proper sealing is critical to ensure that the sight glass can withstand the pressure and temperature of the application without leaks. The choice of gaskets and the installation method must be compatible with the operating environment. For instance, in high-pressure or high-temperature conditions, it’s important to use gaskets made from materials like Viton or graphite, which can maintain their integrity under stress.