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A Weld-On Sight Glass Assembly in which a glass disc is sandwiched between two gasketed metal rings. The bottom ring is welded to the vessel. High and low-pressure models.

Lumiglas® Hi-Pressure Weld-On Sight Glass
A popular style sight glass for industrial settings. Weld to vessel. Sight glass bolts to base.
  • Mounting: Weld-on
  • Glass: Borosilicate or quartz
  • Metal: Carbon, stainless steel or Hastelloy
  • Up to 572° F
  • Up to 235 psi
  • Designed to DIN28120
  • Sizes: Sizes: 3 to 9 inches (view)
Weld-On Sight Glass Assembly, Lumiglas® Low Pressure
Popular for low-pressure industrial applications. Weld to vessel. Sight glass bolts to base.
  • Mounting: Weld-on
  • Glass: Borosilicate or quartz
  • Metal: 316 stainless steel
  • Up to 572° F.
  • 15 psi.
  • Ratings and approvals: TÜV
  • Sizes: 3 to 9 inches (view)
Butt-Weld Sight Glass Assembly Series MV
Sight glass with dairy standard fitting may be used in many non-dairy applications as well. It has a threaded cover nut.
  • Mounting: Butt weld
  • Glass: Borosilicate or quartz
  • Metal: 316 stainless steel
  • Up to 536° F
  • Up to 150 psi
  • Designed to DIN11851
  • Sizes: 2 to 6 inches (view)

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Selecting The Right Sight Glass

8 Essential Questions You Should Ask

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