Sight glass body: Aluminum, turned, with with matte shot-blast finish
Sight glass: ESG glass
Reflector: Heat resistant technopolymer plastic (Polysulfon)
Seal: FPM rubber (Viton®)
Fluid level sight glasses GN 743.1 offer the following features:
1. Genuine glass of high stability and scratch proof.
2. Sealing with an O-ring on the periphery and not on the
face edge of the glass. Leak tightness is therefore not affected
by axial pressures.
3. The seal is housed in a groove and it can therefore not be
lost. In addition, this groove prevents the seal from being
extruded when the sight glass is tightened. The location of
this seal allows also the softer elastomer which guarantees
better and easier sealing.
Fluid level sight glasses GN 743.1 can be used on pressurized
oil tanks. Tests regarding maximum pressure are available
Viton seal: maximum heat resistance: 180°C (356°F).
Sight glasses may be ordered without reflectors.
Note: When mounting oil level sight glasses on walls
of less than 4mm thickness, use nut GN