A clear, circular optical lens with two concentric rings.

A smooth, transparent glass or acrylic object resembling a rectangular prism with rounded edges.

A clear circular ring with a hollow center.

Clear acrylic circular object with a central hole, resembling a lens or magnifier.

A stainless steel flange with transparent glass sections, secured by several bolts for industrial use.

A stainless steel flange with bolts, featuring a smooth surface and a central opening for joining pipes.

Video | Flow sight glass type 641 – ACI Industriearmaturen GmbH

Glass ring tubular sight glass type 641 PN 25/40

Name: Glass ring tubular sight glass type 641 PN 25/40
Brand: ACI Industriearmaturen GmbH
Rating: 5 (31 reviews)

Intermediate flange design for flanges acc. to DIN EN 1092-1

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Available from stock

Intermediate tubular flow sight glass DIN

Datasheet

Certified quality

Technical data

Nominal sizes DN

10
15
20
25
32
40
50
65
80
100
125

Nominal pressure PN

25
40

Temperature

80°C
130°C
150°C
175°C
180°C
200°C
280°C

Options

FEP or Halar® coating
Custom made lengths

Quick overview

max. 40 barg

heat resistant up to 280 °C

for liquid media

for gaseous media

Nominal sizes
DN 10 - 125

Custom made designs possible

Cross-section
drawing

Dimensions

DN	10	15	20	25	32	40	50	65	80	100	125
Di [mm]	14	18	22	29	38	44	55	71	83	108	132
Da [mm]	40	45	58	68	79	88	102	122	138	158	188
Weight² ⁴	0.13	0.16	0.27	0.36	0.46	0.56	0.71	0.94	1.16	1.27	1.71
Weight³ ⁴	0.07	0.08	0.13	0.18	0.22	0.27	0.34	0.46	0.56	0.62	0.83
PS ² ⁵	40	40	40	40	40	40	40	25	25	25	20
PS ³ ⁵	25	25	25	25	20	20	---	---	---	---	---
²Borosilicate glass ³Acrylic glass ⁴Weight in [kg] for L = 50 mm ⁵max. Operating pressure in [barg] Other materials, sizes, lengths and flange standards available on request

Product information

The intermediate sight glass type 641 is a compact solution for visual process monitoring of media in pipelines. The design as an intermediate model allows for a space-saving installation between flanges according to DIN EN 1092-1.

With a working pressure of up to 40 barg, the type 641 is suitable for a variety of industrial applications. The compact construction allows for retrofitting integration into existing systems – even with limited space.

Even with larger nominal sizes, working pressures above 20 barg are achievable, providing additional flexibility.

The standard version made of thermally untempered borosilicate glass is designed for operating temperatures of up to 280 °C and offers a high resistance to thermal and chemical stress.

WN flange type 11 according to DIN EN 1092-1
Gasket
Glass ring tubular sight glass type 641
Gasket
WN flange type 11 according to DIN EN 1092-1

Exploded view of a mechanical flange assembly, including bolts, washers, and a seal.

Would you like personal advice?

Benefit from our expert knowledge in process monitoring. Our experienced team will provide you with sound advice when selecting the ideal sight glass fittings for your specific requirements. Schedule your personal consultation now!

Dirk Göttgens

Executive management

0049 (0) 2461 91634 00

dg@aci24.com

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