The ZW15 Weldable Tank Sight Glass provides clear and direct visualization of processes and product levels inside a vessel, allowing operators to assess critical characteristics such as color, clarity, and consistency of the contents. Recommendations on materials best suited to the specific parameters of your application are available upon request.
Applications
The ZW15 weldable tank sight glass enables observation of the interior of process vessels in industries such as food and beverage, energy, distillery, chemicals, biotechnology, pharmaceuticals, and more.

Item | Part name | Material options |
---|---|---|
1 | Cover Flange | Stainless Steel 316L Stainless Steel 304 Carbon Steel w/ anti-corrosion coating |
2 | Weld Pad | Stainless Steel 316L Stainless Steel 304 Carbon Steel w/ anti-corrosion coating |
3 | Sight Glass (max temp) | DIN7080 Tempered Borosilicate (280°C) Quartz, Min. 95% Fused Silica (1450°C) DIN8902 Tempered Soda Lime (150°C) |
4 | Gaskets *(max temp) | Non Asbestos (200°C) Exp Graphite (450°C) Graph/Kevlar (450°C) FKM (260°C) PTFE (260°C) EPDM (140°C) |
5 | Bolts | Stainless Steel 304 |
Weldable Tank Sight Glass – Installation
The numbers in the following installation instructions refer to the drawing above. After correctly welding the base flange (5) onto the vessel wall, assemble the gasket (3), the sight glass (4), the gasket (3), and the cover flange (2) in that order.
Tighten the bolts (1) according to the torque values indicated in the technical data table (always tighten bolts in diametrically opposite pairs).

Our tank sight glasses are designed to provide clear and precise visual inspection in industrial applications, offering efficient monitoring of fluid levels without interrupting processes. Made with high-quality materials, they ensure durability and resistance in demanding environments, making them a reliable option for any type of tank. Furthermore, their easy installation and maintenance provide a practical and efficient solution.
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