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Spare Parts
Manufactured in borosilicate glass, it is used in numerous applications where both chemical resistance and low thermal expansion coefficient are required.
The red line tube used in level gauge glasses is a specialized feature designed to enhance the visibility of fluid levels in a broad range of industrial applications. This tube incorporates distinct red and white lines that run along its length, providing a stark contrast against the color of the fluid or the background, making it easier to read levels at a glance. Particularly useful in environments with poor lighting or where fluids are clear or have low visibility, the red line aids in precise level determination, reducing reading errors and improving operational safety.
| Property | Testing method | Obtained value |
|---|---|---|
| Thermic dilatation coefficient | ISO 7991 | 3.3 × 10⁻⁶ |
| Density at 25°C | SN 7005 13 | 2.23 g/cm³ |
| Refractive index (λ = 587.6 nm) nd | — | 1.472 |
| Maximum annealing temperature | ISO 7884-8 | 1040 ºF |
| Short-term maximum temperature | ISO 7884-7 | 932 ºF |
| Thermal shock resistance | ISO 7884-4 | 5.67 ºF |
| Young's modulus | — | 63 150 MPa |
| Poisson constant | — | 0.2 |
| Thermal conductivity 20°C – 100°C λ | — | (1.2) (w·m⁻¹)(K⁻¹) |
| Photoelastic constant | DIN 52314 | (4.00 × 10⁻⁶) (mm²/N) |
| Specific electrical resistance 10⁸ Ωcm | DIN 52326 | 482 ºF |
| Dimensional tolerance diameter | DIN 7080 | PASS |
| Property | Testing method | Obtained value |
|---|---|---|
| Hydrolytic resistance | ISO 719 | HGB 1 |
| Acid resistance | ISO 1776 | CLASS S1 |
| Alkaline resistance | ISO 695 | CLASS 2 |
| Chemical composition SiO₂ | — | Minimum content 80% |
| Chemical composition B₂O₃ | — | Minimum content 13% |
| Chemical composition Na₂O + K₂O | — | Minimum content 4.5% |
The red line among two white lines creates an optical effect that magnifies the central line, allowing distant observation of the fluid and increasing the observation distance of the liquid.
The Redline tube goes beyond serving as a visual aid; it is a vital safety feature. The combination of red and white lines produces a high-contrast display, simplifying the task for operators to accurately monitor the water level. This is crucial in high-pressure environments where swift and precise readings are essential to avert hazardous situations.
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Contact us with your application details — pressure, media, and connections — and we will help you specify the right sight glass.