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Rectangular sightglass fittings
TÜV-approved
Series RSG / RSGR / RSGRR
Sizes 170 - 1000
Application:
Rectangular VETROLUX® sightglasses of the series RSG / RSGR / RSGRR may be
used to observe the interior of reactors, columns, silos, vessels, storage tanks and
pipelines. They serve mainly as liquid level gauges. The are delivered ready to be
welded into or onto a vessel wall, complete with the appropriate seals, glass plates,
and cover fastenings.

Operating conditions:
Nominal pressure 16 bar
Vacuum
Note: The nominal pressure indicated refers to the design base of the
sightglass. When welded into the vessel concerned, the base frame becomes
part of the vessel wall. It is necessary, therefore, that appropriate strength
calculations are made on all vessels concerned with respect to the design
pressure and size of the vessel and in accordance with the relevant design
code. If found to be necessary, reinforcement of the vessel wall has to be
carried out.
Operating temperatures:
100 °C max. with sodium silicate glass to DIN 8903
243 °C max. with borosilicate glass to DIN 7081
Note: The above indicated temperatures refer to the use of unprotected glass
plates, with no protective mica sheets.

Rectangular sightglass fitting, series RSGRR,
size 250, with reflex glass

Standard materials:
Base frame:t
RSt 37-2 or HII (boiler plate) / AISI 316 Ti stainless steel
Cover frame:t
As base frame
Glass plate:t
Toughened sodium silicate glass to DIN 8903 (max. 100 °C)
tt
Toughened borosilicate glass to DIN 7081 (max. 243 °C)
Gaskets:t
KLINGERsil C4400 / Neoprene
tt
PTFE / Viton
Cover fastenings:t
Steel, quality 8.8 / Stainless steel
Other materials on request.
Certificates:
To be supplied against extra charge to DIN EN 10204.

Options:t
-t Version with closed base frame (drawing left) to be used as an external liquid level
t gauge with top and bottom pipe connections. For this application, the base frame
t will be supplied appropriately drilled and tapped.
-t Radiused base frame to suit vessel wall
-t Clear (transparent) glass plate
-t Alternative versions in shape and size

Remarks:
The TÜV approval does not apply to the base flange as this is considered as part of
the vessel wall after welding. Standard delivery includes a reflex (fluted) glass plate. In
circumstances where a clear (transparent) glass plate is required, this must be clearly
stated at the time of enquiry.
After welding into the vessel, the base frame should be checked to ensure that
the sealing surface is flat and has not become distorted to avoid possible leakage
under pressure and / or breakage of the glass plate during tightening of the cover
frame bolts. This process should be carried out in several steps and progressively
alternating between each pair of opposite bolts from one end of the frame to the other!
Tighten first little, then repeat the operation.

•t
•
•

Type designation:
Series RSG:ttt Base and cover frame in steel RSt 37-2
t Series RSGR:ttt Base frame in AISI 316 Ti and cover frame in RSt 37-2
t Series RSGRR:ttt Base and cover frame in AISI 316 Ti

Ordering example:
1 piece rectangular sightglass, base frame in AISI 316 Ti, cover frame in RSt 372, length 350 mm, glass plate in sodium silicate glass to DIN 8903, fluted (Reflex),
gasket product side PTFE, cover side Neoprene, cover fastenings 8.8 zinked:
1 piece type RSGR-350, 1.4571 - PTFE - 8903 R - Neoprene - RSt 37-2 - 8.8 zink.

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