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Sight Glasses
Pfaudler - Glass-Lined & Alloy Systems
Technologies
When to use sight glasses?
Many processes, especially in pharma industries, are still visually driven. With Pfaudler PPG glass, an important step has been made towards good light reflection in the reactors. Visual process monitoring is then mostly achieved through two sight glasses, one with a lamp to inject light into the vessel, one for the operator’s insight.
What is the range of Pfaudler’s sight glasses?
Traditionally, sight glasses were manufactured according to DIN 28121 with a borosilicate glass disk fixed by screwing it to a chamber on a glass-lined ring, sealed with a gasket, to prevent it from breaking when tightened.
Pfaudler offers this design, from DN40 to DN200, for temperatures of -60°C to +230°C and pressures of -1/ +10 bar.
Pfaudler “Glasslook” Technology
In the late 1990s, Pfaudler launched the “Glasslook” sight glass series. Sight glasses were no longer fixed by screws in chambers but fused-in a glass-lined ring. The glass and the glass lining are joined to a single compound with the following benefits:
- Less complex assembly, less bulky
- Fracture proof, failure impossible
- No gasket needed, absolutely leakage free
- Easy to clean
“Glasslook” sight glasses are available from Pfaudler for DN50 to DN200, for temperatures of -60°C to +230°C and pressures of -1/ +16 bar (DN50 to DN100), respectively -1/+10 (DN150/ DN200).
“Glasslook” technology became the Pfaudler standard for sight glasses on handholes and manway covers.
