Round Sight Glasses With Central Hole

ROUND SIGHT GLASSES WITH CENTRAL HOLE

Rounded sight glass may be subject to evaporation or covering substance from observed tank. This could have a significant impact on reducing the visibility. In this case it is recommended to use a round glass with wiper. Examples of wipers for round glasses we discuss here.

Installing a wiper, however, requires the use of glass spy hole in the middle. This solution may affect allowable pressure, which can operate under glass with wiper.

There are a rounded sight glassmade of soda-lime glass and of borosilicate glass. 

Dimensions and properties of rounded sight glasses with central hole are discussed below.