Sight glasses are widely used in the food-processing, cosmetics, pharmaceutical and fine chemicals industries.

Operating principle

A flat sight glass consists of a glass fastened by means of a sanitary DIN uniion.
Sight glasses are fitted to tanks to enable the inspection of the product, level, course of the process, etc.

Design and features

Glass fsatened by a sanitary DIN union.
Welding connections DIN 11850.


Body AISI 316L (1.4404)
Glass Tempered
Adapter gasket NBR in compliance with FDA 177.2600
Glass support gasket PTFE in compliance with FDA 177.2600
Surface finish Sanitary polish, Ra ≤ 0,8 µm


Body: AISI 304.
Gaskets: EPDM, VMQ or FPM. All in compliance with FDA 177.2600.
Borosilicate glass in compliance with ISO 3585 and EN 1748 T1.
Double flat sight glass.