Product Overview
Soda-lime transparent gauge glass is used for direct liquid-level observation in transparent sight glass and level gauge assemblies. It is suited to low thermal and chemical loading where clear visual monitoring is required.
This product is also known as soda lime sight glass, transparent gauge glass, transparent level gauge glass, sight glass plate, and level indicator glass. It is used where the process medium must be visible through a clear glass window under pressure, but the service conditions remain within the limits of soda-lime glass.
Typical Applications
Soda-lime transparent gauge glass is used for visual inspection of liquids in vessels and pipelines, especially in cost-sensitive installations and other applications with relatively low thermal and chemical stress. Technical information for DIN 8902 sight glasses states an operating temperature of 150 °C and notes that pressure depends on diameter and thickness.
Material and Technical Characteristics
DIN 8902 technical information for soda-lime sight glass lists a coefficient of expansion of 9.5 × 10⁻⁶ K⁻¹ at 20 °C / 300 °C, thermal shock resistance of 150 °C, water resistance class 4 according to DIN ISO 719/720, acid resistance class 1 according to DIN 12116, and alkali resistance class 2 according to DIN 52332.
Technical Parameters
| Item | Specification |
|---|---|
| Material | Soda-lime glass |
| Product type | Transparent gauge glass / transparent sight glass / sight glass plate |
| Operating temperature | Up to 150 °C |
| Pressure | Depends on diameter and thickness |
| Coefficient of expansion | 9.5 × 10⁻⁶ K⁻¹ |
| Thermal shock resistance | 150 °C |
| Water resistance | DIN ISO 719/720, hydrolysis class 4 |
| Acid resistance | DIN 12116, acid class 1 |
| Alkali resistance | DIN 52332, alkali class 2 |
| Application level | Low thermal and chemical load |
| Visual function | Direct liquid-level observation |
Common Sizes
| Product Code | Diameter (mm) | Thickness (mm) | Admissible Pressure |
|---|---|---|---|
| 12-8902-45-10 | 45 | 10 | 40 |
| 12-8902-63-10 | 63 | 10 | 16 |
| 12-8902-80-12 | 80 | 12 | 16 |
| 12-8902-100-15 | 100 | 15 | 16 |
| 12-8902-125-15 | 125 | 15 | 10 |
| 12-8902-125-20 | 125 | 20 | 16 |
| 12-8902-150-15 | 150 | 15 | 8 |
| 12-8902-150-20 | 150 | 20 | 10 |
| 12-8902-150-25 | 150 | 25 | 16 |
| 12-8902-175-20 | 175 | 20 | 10 |
| 12-8902-175-25 | 175 | 25 | 16 |
| 12-8902-200-20 | 200 | 20 | 8 |
| 12-8902-200-25 | 200 | 25 | 10 |
| 12-8902-250-20 | 250 | 20 | 4 |
| 12-8902-250-25 | 250 | 25 | 8 |
Dimensional Tolerances
| Dimension | Tolerance |
|---|---|
| Diameter up to 125 mm | ±0.5 mm |
| Diameter 125 to 200 mm | ±0.8 mm |
| Diameter above 200 mm | ±1.0 mm |
| Thickness 10 to 20 mm | ±0.50 mm |
| Thickness above 20 mm | ±0.80 mm |
Advantages
Soda-lime transparent gauge glass is a practical choice for applications that prioritize clear viewing and controlled cost. It is suitable for standard sight-glass service where the temperature stays within soda-lime operating range and where the medium does not create severe chemical attack.
