What is a sight glass fitting?
Sight glass fittings allow for visual inspection of the interior of containers and pipelines, as well as the determination of levels. They are roughly divided into container sight glasses, flow sight glasses, and level indicators.
Container sight glasses
Container sight glasses consist of two flanges with a glass pane secured in between. They are available in round design or as longitudinal sight glasses. Round container sight glasses can be welded or, for example, screwed to flange connections. Longitudinal sight glasses, on the other hand, are mostly welded.
Flow sight glasses
Flow sight glasses consist of a housing and laterally attached sight glasses. They can be connected via a flange connection, screwed together using threads, or welded using welding ends. As a special version of the flow sight glasses, the flow tubular sight glasses allow for a 360° all-round view. They consist of a glass tube that is clamped between two flanges.
Level indicator
Level indicators are mounted externally on a container and indicate the level of the medium. Level indicators are differentiated into indication reflectors and glass tube level indicators. In indication reflectors, an elongated sight glass plate is clamped between a housing and a cover frame. The medium enters through the connection openings, allowing the level to be read based on the principle of communicating vessels. In glass tube level indicators, a glass tube is secured between two connection fittings through which the level can be read.
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