Product Overview
Quartz reflex gauge glass is a fused-silica sight glass used for reflex-style liquid-level reading in industrial level gauge assemblies. It is selected where clear visibility and very high thermal-shock resistance are required in extreme-temperature service.
This product is commonly searched as quartz sight glass, fused silica sight glass, quartz level gauge glass, quartz gauge glass window, and high-temperature sight glass for level indication. Quartz sight glasses are used for optical observation of fluid level, flow line, and process conditions in tanks and similar equipment.
Working Principle
Reflex-style level indication uses optical contrast between the liquid and vapor zones, with the liquid region appearing darker and the vapor region appearing brighter. That contrast comes from grooves or prism geometry on the media side of the glass; in quartz-based assemblies, the same viewing principle is applied when the gauge is engineered for reflex-type service.
Typical Applications
Quartz reflex gauge glass is suitable for high-temperature process viewing, boiler and furnace observation points, reactors, and other installations where a clear visual window must survive heat and thermal shock. Published quartz sight-glass material information states use above 1000°F and thermal shock greater than 280°F, and quartz sight glasses are described for furnaces, boilers, and reactors.
Material and Fabrication Range
Quartz sight-glass data identifies the material as fused silica, minimum 95%, with special dimensions available on request.
Technical Parameters
| Item | Specification |
|---|---|
| Material | Fused silica quartz glass, min. 95% |
| Product type | Quartz reflex gauge glass / quartz sight glass / quartz level gauge glass |
| Service focus | High-temperature direct level indication |
| Operating temperature | Above 1000°F |
| Thermal shock resistance | Greater than 280°F |
| Minimum diameter | 10 mm |
| Maximum diameter | 350 mm |
| Minimum thickness | 3 mm |
| Maximum thickness | 25 mm |
| Available forms | Circular, square, rectangular, oblong |
| Special features | Special dimensions, holes, and bevels available on request |
Common Size Examples
| Size Type | Published Range |
|---|---|
| Custom quartz sight-glass diameter | 10–350 mm |
| Custom quartz sight-glass thickness | 3–25 mm |
| Rectangular / obround sight-glass assembly viewing area | 2 × 6 to 4 × 24 in |
| Assembly temperature rating example | Up to 600°F |
| Assembly pressure rating example | Up to 150 psi |
Advantages
Quartz reflex gauge glass is used when the application needs strong thermal endurance, high optical clarity, and stable performance under rapid temperature change. Published sight-glass information also notes quartz’s long-range light transmission and its suitability for direct observation in demanding industrial environments.
