Engineered Solutions for Process Industries
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Sight Glass

The objective of a sight glass is to provide a window into a pressure vessel, a hot temperature or corrosive process environment, for machine vision or live observation. We manufacture and distribute sight glasses, sapphire windows and quartz windows, as well as laser window assemblies. Encole offers stock and custom high pressure sight glasses for energy and pharmaceutical applications. We also offer sight windows for ultra high vacuum. Sight windows available through the catalog cover a broad spectrum of transmitted wavelengths, from infrared to ultraviolet. Show More
Image Encole Part Number Price Aperture Dia. Diameter Housing Material Max Operating Temperature Thickness Window Coating Window Material With Reflector
265A1000 $244.95 each 0.370 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent No
265A1001 $255.78 each 0.470 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent No
265A1002 $259.80 each 0.650 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent No
265A1003 $275.99 each 0.870 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent No
265A1004 $368.87 each 1.200 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent No
265A1005 $409.00 each 1.400 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent No
265A1006 $498.16 each 1.820 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent No
266A1000 $244.95 each 9.50 mm - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
266A1001 $255.78 each 12.00 mm - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
266A1003 $275.99 each 16.50 mm - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
266A1004 $368.87 each 22.10 mm - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
266A1005 $409.00 each 30.50 mm - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
266A1006 $498.16 each 35.40 mm - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
266A1007 $558.75 each 46.10 mm - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
268A1000 $244.95 each 0.370 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
268A1001 $255.78 each 0.470 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
268A1002 $259.80 each 0.650 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
268A1003 $275.99 each 0.870 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
268A1004 $368.87 each 1.200 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -
268A1005 $409.00 each 1.400 inch - 316 Stainless 150 C - - Quartz GE-124, or Equivalent -

Listed sight glasses in the table are products released to production. These are stable designs that have been fully engineered, tested and proven in the field in various uses.

Sight glass manufacturers offer custom configurations upon request. Most common custom designs are high temperature and high pressure sight glasses. These are typically NPT or Flanged sight windows where the glass is brazed to the housing. For applications requiring higher operating temperatures, above 500 degrees C, the window is typically made from sapphire. It is sealed into the housing with a metal C-seal, made from Inconel(R), Alloy 718, or Waspaloy(R).

Fused sight glasses with borosilicate glass are commonly used in heaters, oil tank sights, liquid level applications where operating temperatures do not exceed 300 degrees C. For excellent optical clarity we recommend viewports and sight windows with quartz or sapphire windows polished to minimum 40-60 S-D. These sight glasses are typically used in imaging systems or in conjunction with laser sensors. Use the Filter to the left of the table to select the right sight glass based on the application parameters.

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