Self-cleaning rotor flow indicator with borosilicate glass

This flow indicator is installed directly in liquid pipelines and shows the passage of the medium by means of a plastic rotor housed in a hard borosilicate glass body. Female threaded end connections on both sides are available in brass or stainless steel. Its key feature is the self-cleaning function, which keeps the window readable even when dirt and deposits build up.

Features

• Indicating range from 0.4…4 up to 8…100 l/min (water)
• Female threaded connections from G ¼ to G 1½ or from ¼ to 1½" NPT
• End connections in brass or stainless steel
• Transparent borosilicate glass body with plastic rotor
• Maximum pressure 16 bar, maximum temperature 100 °C
• Suitable for liquids with viscosity from 1 to 150 mm²/s

Operating principle

The flowing medium turns the rotor, which is visible through the glass. When the sight glass is rotated by hand through 180°, built-in wipers remove deposits from its inner surface and the loosened dirt is simply carried away by the flow. Low-friction O-rings keep the glass sealed while allowing it to be turned.

Applications

Visual monitoring of circulation in systems handling liquids that tend to foul sight windows, where conventional indicators lose visibility over time.