Process Side of NPT 3-inch Quartz Sight Glass

High pressure sight glass. View from the process side.

This is a NPT size 3-inch sight glass with Quartz window bonded to the 316L stainless steel housing. Notice the window takes up the entire height of the metal housing. It's a rather thick window enabling 6000 psi operating pressure at ambient temperature. Sapphire can be much thinner to offer less refraction, at the same pressure.

Product development for optically clear pressure windows.