Visual Flow Indicators
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Sight Flow Indicators
View Through vs. Full View
Also called 360° view, a full view flow indicator passes fluid through a glass cylinder that is visible from all angles. It is ideal for the observation of process fluid for clarity, color, foam, and other conditions, and for the presence of moisture. Depending on the model it may or may not be suited for high temperatures or pressures.
Type of Indication
Carbon Steel vs. Stainless Steel
Type of Glass
Borosilicate glass is more resistant to thermal shock and caustic than soda lime glass, and should be specified in areas where hot equipment may experience washdowns with cool water or corrosive chemicals.
Quartz or sapphire glass is recommended for temperatures greater than 500◦ F, such as in high temperature steam applications.
Glass can come as a conventional glass disc or as a glass disc fused to a metal ring during manufacturing. Fused sight glass windows, such as our Metaglas® and Metaclamp® brands, hold the glass in concentric compression that makes the glass resistant to bending stresses that would otherwise cause cracks or failure. They are preferred when high pressure ratings, impact resistance, thermal shock resistance, and high safety margins are desired.
Want to know more?
Handy 13-page engineering handbook covers sight flow indicators in chemical and pharmaceutical applications. A handy reference for experienced engineers and a useful guide for those new to sight flow indicators, it offers a full overview covering design, materials, types of indication, types of glass, accessories, plus installation and maintenance tips.