Tighten the screws:
•
Tighten the screws in many small steps crosswise using a torque spanner to the
tightening torques of the screw/sealant combination.
•
To avoid glass distortion, all screws must have exactly the same tightening torque.
•
We recommend lubricated screws. For the recommended torques of the cover
screws and the standard seals, please refer to the respective product data sheets
of the corresponding manufacturers.
After commissioning:
•
Under the influence of pressure and temperature, you can expect the seal to "set".
•
Check the torques of the fastening screws again in a cold and depressurised state
and correct if necessary.
Maintenance and care
The sight glasses are insensitive to contamination, as the inner surface is flushed by the
flowing medium.
The sight glasses have no dead spaces, so that the sight glass can be flushed or cleaned
together with the pipeline when changing the product.
The sight glasses are insensitive to contamination because the inner surface is rinsed by
the flowing medium.
The sight glasses have no dead spaces, so that when the product is changed, the sight
glass can be rinsed or cleaned together with the piping.
When cleaning the outer glass surface, use a clean and soft cloth and avoid scratching
the glass (loss of strength). Commercially available cleaning agents (e.g. glass cleaner)
may be used.
If the glass is also so dirty from the inside that it cannot be rinsed free by the medium
itself, the sight glass can be removed and cleaned in the same way as from the outside
(loosen the fastening nuts crosswise).
When reinstalling, always use new gaskets.
If the surface of the sight glass is affected (scratches, fissured surface, visible glass
erosion due to milky surface), the sight glass must be replaced, as a loss of strength must
be assumed.
DG04 Instruction manual 12/2020
page 4
