Reflex level gauge glasses
Reflex level gauge glasses are installed in gauges that have a housing closed at the back. The incident light is refracted by the reflective grooves of the glass in the media-carrying area of the fitting. The area in which the liquid medium is located is thus shown as a dark bar – in contrast to the silvery gaseous area.
Transparent level gauge glasses
These glasses are mainly used in gauges open on both sides for high pressure applications. The incident light (daylight or that of a luminaire) passes through both sight glasses between which the medium is located. The level is visible as a line or through the medium itself. With aggressive media or when using saturated steam, the transparent level gauge glasses should also be provided with mica protection.
Manufacturing process
The mechanical strength and pressure resistance of Maxos® safety level gauge glasses depend on many factors: Decisive factors include thermal prestressing, homogeneity of the glass, parallelism, exact dimensions and a flawless surface. A state-of-the-art glass melting process ensures a homogeneous SUPRAX® 8488 borosilicate glass that is nearly free of streaks and bubbles. Through high-quality grinding and polishing processes, a particularly flat and plano-parallel surface is achieved. The prestressing that occurs during thermal tempering is decisive for the strength of the glass.
All measurement and dimensional tolerances are ensured by process-integrated tests. All processing steps can be traced back through encoding on the glass.