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Hygienic Sintered Glass Window for Weld-On Fittings
LUMISTAR Hygienic Sintered Glass Windows are designed for compact visual inspection in sterile process lines and hygienic equipment. Featuring a sintered borosilicate glass element integrated with a stainless steel holder, this low-profile design is suitable for compatible NA-Connect and hygienic fitting systems. Ideal for food, beverage, cosmetic and pharmaceutical applications where cleanability, secure installation and reliable process observation are essential.
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Technical data
Hygienic Sintered Glass Window for Weld-On Fittings
The LUMISTAR Hygienic Sintered Glass Window is a compact glass-to-metal viewing component developed for hygienic process equipment and sterile production lines. Combining a sintered borosilicate glass element with a metal holding ring, it provides a dedicated viewing area for monitoring process conditions in compatible tanks, pipelines and sanitary equipment.
During manufacturing, the glass element is integrated with a metal holder through a controlled sintering and joining process. This construction is designed to provide a secure glass-to-metal assembly for industrial observation applications. The final performance depends on the glass structure, metal material, manufacturing process and installation conditions.
The compact, low-profile design is intended for installations where space is limited and hygienic construction is important. When matched with a compatible fitting, the viewing window can support process observation while helping minimise unnecessary dead space around the connection. Proper installation and cleaning procedures remain essential for hygienic operation.
The product is designed for compatible NA-Connect and hygienic fitting systems, including connection configurations associated with DIN 32676 and ISO 2852. Available mounting arrangements and dimensions should be confirmed against the required connection standard and equipment design before ordering.
The glass element is made from sintered borosilicate glass, while the housing or holding ring can be manufactured from stainless steel 304 or 316, depending on the configuration. Duplex stainless steel and selected nickel-based alloys may also be considered for specific requirements. Material selection should take into account the process medium, cleaning chemicals, operating temperature and corrosion conditions.
Hygienic Sintered Glass Window for Weld-On Fittings— Technical Data
| Parameter | Specification |
|---|---|
| Product Name | Hygienic Sintered Glass Window |
| Product Type | Sintered Welded Sight Glass |
| Glass Material | Sintered Borosilicate Glass |
| Housing / Holder | Stainless Steel 304 / 316 |
| Optional Ring Materials | Duplex Stainless Steel / Selected Nickel-Based Alloys |
| Connection Type | NA-Connect / Compatible Hygienic Fittings |
| Connection Standards | DIN 32676 / ISO 2852, subject to configuration |
| Mounting Style | Weld-On / Compatible Fitting Assembly |
| Reference Operating Temperature | 150°C |
| Reference Pressure Rating | 7 bar |
| Higher Pressure | Subject to technical evaluation |
| Material Certificates | EN 10204 3.1 documentation, subject to order requirements |
| Customization | Dimensions and materials subject to review |
| Typical Applications | Food, Beverage, Pharmaceutical and Cosmetic Processing |
Hygienic Sintered Glass Window for Weld-On Fittings -Drawing


Optional Dimension & Pressure Reference Table
| Nominal diameter | PN | d1 | d2 | d3 | d4 | S | Dy | Di | |
|---|---|---|---|---|---|---|---|---|---|
| DIN | Tube OD | ||||||||
| NAC-DIN-20 | – | 16 | 34,0 | 18,0 | 10 | 27,5 | 7 | 70 | 20,0 |
| NAC-DIN-40 | (NAC-OD-1½”) | 16 | 50,5 | 38,0 | 25 | 43,5 | 10 | 85 | 35,5 |
| NAC-DIN-50 | (NAC-OD-2″) | 16 | 64,0 | 51,0 | 30 | 56,5 | 10 | 100 | 48,5 |
| – | (NAC-OD-2½”) | 16 | 77,5 | 63,5 | 35 | 70,5 | 10 | 112 | 60,2 |
| NAC-DIN-65 | (NAC-OD-3″) | 10 | 91,0 | 76,0 | 40 | 83,5 | 10 | 131 | 72,0 |
| NAC-DIN-80 | – | 10 | 106,0 | 88,9 | 50 | 97,0 | 10 | 146 | 84,9 |
| NAC-DIN-100 | (NAC-OD-4″) | 10 | 119,0 | 101,0 | 55 | 110,0 | 12 | 170 | 97,6 |
KEY FEATURES
Compact Welded Assembly
Integrated glass and metal construction for space-saving installations.
Sintered Borosilicate Glass
Designed for industrial process observation under suitable operating conditions.
Hygienic Low-Profile Design
Helps minimise unnecessary dead space in compatible sanitary fittings.
Stainless Steel Options
Available with 304 or 316 stainless steel holders, subject to configuration.
Sanitary Connection Compatibility
Designed for compatible NA-Connect and selected hygienic fitting systems.
Custom Configuration Review
Dimensions, materials and operating conditions can be assessed for project requirements.
Custom Manufacturing Service
We provide tailor-made solutions according to drawings or technical requirements.
- Custom diameter
- Custom thickness
- Special pressure design
- Edge polishing
- Optical finishing
- OEM / ODM support
- Custom packaging
TYPICAL APPLICATIONS
- Pressure Vessels
- Chemical Reactors
- Boilers & Steam Systems
- Pipeline Sight Glass Assemblies
- Pharmaceutical Equipment
- Food & Beverage Processing
- Industrial Observation Ports
FAQ
A: It is a process viewing component made with sintered borosilicate glass integrated with a metal holder. It is designed for visual inspection in compatible hygienic and industrial equipment.
A:Typical applications include food and beverage processing, pharmaceutical manufacturing, cosmetic production, sterile process lines and hygienic tanks or pipelines.
A: The glass element is made from sintered borosilicate glass. Stainless steel 304 and 316 are reference holder materials, while selected alternative alloys may be available depending on the design.
A: The reference product information lists a nominal operating temperature of 150°C. The permissible temperature for a specific assembly must be confirmed according to its materials, design and operating conditions.
A: The reference product is intended for hygienic applications and identifies CIP cleaning as a use case. Suitability depends on the complete fitting design, cleaning chemicals, temperature, flow conditions and the validated cleaning procedure.
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