Round Sight Glass with Wiper | Sight Glass Disc with Wiper Hole, Borosilicate Glass
Product Overview
The product is commonly searched as round sight glass with wiper, sight glass disc with wiper hole, round sight glass with central hole, and circular sight glass disc with wiper. In supplier documentation, wiper series such as W / WD / WDT / WR / WDR are built into sight glasses similar to DIN 28120 or DIN 11851, and the glass discs are specified with a central hole diameter of 10.5 mm.
This product is used where operators need visual monitoring and periodic cleaning of the inner glass surface. The same wiper datasheet states that the wiper is used to prevent crystallisation on the inner side of the glass disc or to keep the sight glass free of dust and dirt.
Typical Applications
Round sight glass with wiper is suitable for industrial systems that need both visibility and manual cleaning access. These wipers as suitable for sightglass assemblies in process equipment where product buildup, crystallisation, or contamination can reduce visibility.
Typical applications include:
- process tanks and pressure vessels
- chemical and pharmaceutical equipment
- breweries and food-process sight glass assemblies
- liquid-level observation systems
- sight glasses exposed to crystallising or dirty media
Material and Performance
For the DIN 7080-type circular sight glass disc family, that the discs are ground and polished and intended for pressure duties up to 280°C.
Material Properties
| Property | Value | Reference |
|---|---|---|
| Material options | Sodium silicate similar to DIN 8902 / borosilicate similar to DIN 7080 | |
| Density | 2.23 ± 0.02 g/cm³ | |
| Thermal expansion coefficient (0–300°C) | 3.3 ± 0.1 × 10⁻⁶/K | |
| Softening point | 815 ± 10°C | |
| Strain point | 560 ± 10°C | |
| Pressure duty (DIN 7080-type disc literature) | Up to 280°C | |
| Surface finish | Ground and polished |
Key Advantages
- Central bore hole for wiper compatibility: the disc is specifically documented with a 10.5 mm bore for W/WD-series wipers.
- Cleaner viewing window: the wiper helps keep the inner glass surface free from crystallisation, dust, and dirt.
- High-temperature capability: the referenced wiper system supports maximum temperatures of 180°C with silicone rubber blades and 200°C with PTFE blades; the sightglass disc literature also states maximum permissible operating temperature up to 220°C depending on glass type.
- Industrial-standard compatibility: the product family is used with sight glasses similar to DIN 28120 and DIN 11851.
- Material flexibility: borosilicate and soda-lime-type disc options appear in the referenced literature, depending on application.
Technical Specifications
Wiper-Disc Reference Data
| Parameter | Value | Reference |
|---|---|---|
| Product name | Sightglass disc with central bore hole | |
| Alias | Sight Glass Disc with Wiper Hole | |
| Central bore hole | 10.5 mm | |
| Wiper compatibility | W / WD / WDT / WR / WDR series | |
| Suitable sightglass families | Similar to DIN 28120 or DIN 11851 | |
| Minimum bore size application | DN 50 and greater | |
| Pressure tightness | Min. 15 psi, up to 90 psi depending on glass size | |
| Maximum operating temperature | 220°C depending on glass used |
Wiper Operating Conditions
| Condition | Value | Reference |
|---|---|---|
| Maximum pressure inside vessel | 2 to 6 bar depending on glass diameter | |
| Vacuum | Values on request | |
| Maximum temperature with silicone rubber blade | 180°C | |
| Maximum temperature with PTFE blade | 200°C |
Size / Pressure Table for Circular Sight Glass Disc Family
| Outer Size (D × s, mm) | Free View (mm) | Nominal Pressure (bar) | Reference |
|---|---|---|---|
| 84 × 10 | 65 | 4 | |
| 99 × 15 | 80 | 6 | |
| 114 × 15 | 100 | 5 | |
| 125 × 15 | 100 | 4.5 | |
| 147 × 15 | 125 | 3 | |
| 150 × 15 | 125 | 3 | |
| 175 × 15 | 150 | 2 | |
| 200 × 15 | 175 | 1.5 | |
| 225 × 15 | 205 | 1.5 | |
| 250 × 19 | 225 | 1.5 |
Quality Proof and Evidence
Recommended evidence blocks for your page:
- Inspection report: dimensional inspection, edge finish, and visual quality
- Customer case: real tank, vessel, or process-line installation
- Test data: pressure test, thermal cycling test, or cleaning-performance report
- Certificates: only certificates you can actually provide to buyers
FAQ
What is a round sight glass with wiper?
It is a circular sight glass disc designed for use with a manual wiper so the viewing area can be cleaned during service.
What is the common search alias?
A common alias is Sight Glass Disc with Wiper Hole.
What is the bore hole size?
The referenced wiper system uses a 10.5 mm central bore hole.
What is the temperature limit?
The wiper datasheet states 180°C with silicone rubber blades and 200°C with PTFE blades; the sightglass-disc datasheet states up to 220°C depending on glass used.
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