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 and quartz windows as well as laser window assemblies. Encole offers stock and custom high pressure sight glasses for energy, food processing and pharmaceutical applications. We also offer sight windows for ultra high vacuum in semiconductor applications. Sight windows available through the catalog cover a broad spectrum of transmitted wavelengths, from infrared to ultraviolet.

Metaglas, Herberts Industrieglas GmbH & Co. KG

ConFlat, CF Sight Glasses, Borosilicate Fused to Duplex Steel 2205 or Hastelloy Housing

CF flanged sight windows for ultra high vacuum applications and sanitary processing equipment. Suitable configuration for DUV lithography and UV inspection in semiconductor applications, food, and pharmaceutical industries. Designed for use with standard metal gaskets to ISO 3699 connections.

Fusing glass to metal creates a hermetically sealed single-piece part. The advantage of this construction is high strength of the glass, which ensures safety of operation, even during cycling operating temperatures common with equipment starts and stops. The part is easy to install, and has a long working life without maintenance.

Nominal Pipe SizeAperture Dia.Housing MaterialWindow MaterialMax Operating Temp.Mfg. P/N.Encole P/N.Price
1-1/3" (DN16)18.00 mm2205 DuplexBorosilicate280 CMet 19CF-S-DN16909N03$339.67each
1-1/3" (DN16)18.00 mmHastelloy C-22Borosilicate300 CMet 19CF-H-DN16910N03$1875.36each
2-3/4" (DN40)35.00 mm2205 DuplexBorosilicate280 CMet 19CF-S-DN40909N06$379.45each
4-1/2" (DN63)60.00 mm2205 DuplexBorosilicate280 CMet 19CF-S-DN63909N08$1215.15each
6" (DN100)70.00 mm2205 DuplexBorosilicate280 CMet 19CF-S-DN100909N10$1449.67each
8" (DN160)90.00 mm2205 DuplexBorosilicate280 CMet 19CF-S-DN160909N12$1803.28each
10" (DN200)120.00 mm2205 DuplexBorosilicate280 CMet 19CF-S-DN200909N13$2174.39each
2-3/4" (DN40)35.00 mmHastelloy C-22Borosilicate300 CMet 19CF-H-DN40910N06$2142.75each
4-1/2" (DN63)60.00 mmHastelloy C-22Borosilicate300 CMet 19CF-H-DN63910N08$2468.88each
6" (DN100)70.00 mmHastelloy C-22Borosilicate300 CMet 19CF-H-DN100910N10$2793.64each
8" (DN160)90.00 mmHastelloy C-22Borosilicate300 CMet 19CF-H-DN160910N12$3165.79each
Load more
Encole

Metric Sight Glasses, 316 Stainless Steel, Quartz Windows

Sight windows with metric threads conforming to ASME B1-1.3M-2005. For visual inspection, machine vision, laser sensors, in use with all common hydraulic oils, refrigerants, pharmaceutical processing equipment, paper & pulp plants, marine exterior, oil wells, feedwater heaters. Resists most oxidizing acids and salt sprays.

AISI 316 Stainless Steel housing has a finish of 32 RMS providing smooth surfaces reducing residues or particle contaminants. Quartz window is sealed into the housing with non-outgassing quartz-filled bond forming a single-piece part. This sight glass has a long working life under severe temperature swings and prolonged exposures to UV light.

Required port to Standard: DIN ISO 6149-1. Male stud of the fitting conforms to: ISO 6149-2/3 for use with O-ring ISO M18.

Aperture Dia.ThreadMax Operating PressureMax Operating Temp.Housing MaterialWindow MaterialMfg. P/N.Encole P/N.Price
9.50 mmM18 x 1.5210 bar70 CAISI 316Quartz100488266A1000$248.36each
11.60 mmM20 x 1.5210 bar65 CAISI 316Quartz100491266A1001$266.04each
16.30 mmM27 x 2210 bar55 CAISI 316Quartz100497266A1003RFQ
21.80 mmM33 x 2210 bar50 CAISI 316Quartz100500266A1004RFQ
30.00 mmM42 x 2210 bar45 CAISI 316Quartz100503266A1005$530.00each
35.10 mmM48 x 2210 bar40 CAISI 316Quartz100506266A1006RFQ
45.70 mmM60 x 2200 bar35 CAISI 316Quartz100509266A1007$701.42each
Metaglas, Herberts Industrieglas GmbH & Co. KG

M-Threaded Sight Glass, Borosilicate Fused to Duplex Steel 2205 or Hastelloy Housing

Sight windows with straight metric threads sealing with an O-ring. Female connection port conforming to DIN 3852 Type F.

For visual inspection, machine vision, optical sensors, in use with all common hydraulic oils, refrigeration, water heaters, and compressed air applications.

Fusing glass to metal creates a hermetically sealed single-piece part. The advantage of this construction is high strength of the glass, which ensures safety of operation, even during cycling operating temperatures common with equipment starts and stops. The part is easy to install, and has a long working life without maintenance.

Aperture Dia.ThreadMax Operating PressureMax Operating Temp.Housing MaterialWindow MaterialMfg. P/N.Encole P/N.Price
10.00 mmM18 x 1.550 bar280 C2205 DuplexBorosilicateMet 61-M18 x 1.5S702M18$195.03each
10.00 mmM18 x 1.550 bar300 CHastelloy C-22BorosilicateMet 61-M18 x 1.5H703M18$398.80each
12.50 mmM20 x 1.550 bar300 CHastelloy C-22BorosilicateMet 61-M20 x 1.5H703M20$459.75each
16.50 mmM26 x 1.550 bar300 CHastelloy C-22BorosilicateMet 61-M26 x 1.5H703M26$515.80each
16.50 mmM27 x 250 bar300 CHastelloy C-22BorosilicateMet 61-M27 x 2H703M27$538.98each
22.00 mmM33 x 250 bar300 CHastelloy C-22BorosilicateMet 61-M33 x 2H703M33$575.90each
24.00 mmM42 x 250 bar300 CHastelloy C-22BorosilicateMet 61-M42 x 2H703M42$649.47each
26.00 mmM48 x 250 bar300 CHastelloy C-22BorosilicateMet 61- M48 x 2H703M48$698.54each
34.00 mmM60 x 250 bar300 CHastelloy C-22BorosilicateMet 61-M60 x 2H703M60$757.41each
12.50 mmM20 x 1.550 bar280 C2205 DuplexBorosilicateMet 61-M20 x 1.5S702M20$223.70each
16.50 mmM26 x 1.550 bar280 C2205 DuplexBorosilicateMet 61-M26 x 1.5S702M26$275.80each
Load more
Metaglas, Herberts Industrieglas GmbH & Co. KG

ASME B16.5 - Flanged Sight Glasses, Borosilicate Windows

Sight windows for corrosion resistant applications. Suitable configuration for flue gas scrubber systems, cooling towers, incinerators, geothermal wells, deep/shallow sea water applications, biofuels, food, and pharmaceutical processing equipment. Requires parallel mounting flat face and full gasket.

Fusing glass to metal creates a hermetically sealed single-piece part. The advantage of this construction is high strength of the glass, which ensures safety of operation, even during cycling operating temperatures common with equipment starts and stops. The part is easy to install, and has a long working life without maintenance.

Nominal Pipe SizeASME ClassAperture Dia.Max Operating Temp.Housing MaterialWindow MaterialMfg. P/N.Encole P/N.Price
1-1/2"15040.00 mm280 C2205 DuplexBorosilicateMet 13A15-1.5S905S13$749.63each
2"15050.00 mm280 C2205 DuplexBorosilicateMet 13A15-2S905S14$974.85each
2-1/2"15060.00 mm280 C2205 DuplexBorosilicateMet 13A15-2.5S905S15$1362.45each
3"15075.00 mm280 C2205 DuplexBorosilicateMet 13A15-3S905S16$1679.80each
4"150100.00 mm280 C2205 DuplexBorosilicateMet 13A15-4S905S18$1820.70each
6"150140.00 mm280 C2205 DuplexBorosilicateMet 13A15-6S905S21$2655.25each
8"150160.00 mm280 C2205 DuplexBorosilicateMet 13A15-8S905S23$3184.35each
1-1/2"30040.00 mm280 C2205 DuplexBorosilicateMet 13A-30-1.5S907S13$1748.51each
2"30050.00 mm280 C2205 DuplexBorosilicateMet13A-30-2S907S14$1812.20each
2-1/2"30060.00 mm280 C2205 DuplexBorosilicateMet 13A-30-2.5S907S15$1897.60each
3"30070.00 mm280 C2205 DuplexBorosilicateMet 13A-30-3S907S16$2651.35each
Load more
Encole also offers custom sight glasses upon request. The 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.
Loading