Oil level sight glasses now include ATEX versions
March 1st 2008

Berger Tools, distributor of oil sight glasses made of plastic and aluminium, has extended its product range to include versions made of stainless steel and brass.

In addition, an ATEX sight glass made of aluminium has been developed for use in explosion hazard environments. This is available in three sizes with different threads and complies with EU requirements.

All new oil sight glasses are supplied in scratchproof toughened glass in stable dimensions. They are sealed with an O-ring (FPM, Viton) at the glass circumference and not on the planar side, which means that the sealing tightness does not depend on the axial contact pressure force.

The outer sealing ring is embedded in a radial undercut on the planar side; as a result, the seal cannot be lost and will not be squeezed out during tightening. As the seal is relatively soft, it is also suitable for sealing uneven surfaces.

Depending on temperature requirements, sight glasses with temperature resistance ratings of up to 100 or to 180°C are available.

The new brass and stainless steel oil sight glasses can also be used on pressurised containers or containers exposed to vacuum.

Types GN 743.7 and 743.8 have a cone-shaped external thread which allows metal contact sealing.

When tightened, the cone-shaped outer tube thread 'R' engages and locks with the appropriate cylindrical internal thread 'Rp'. As additional sealing agents are normally used, the outer thread is 'roughened' to make sure the sealant is not displaced during locking.

Stand 4818