Intermediate flange sight glass type 640 - PN16

Intermediate flanged pipe sight glass for higher pressures

The ACI intermediate flange tubular sight glass type 640 is a solid intermediate flange version of our tubular sight glasses.

The Type 640 is suitable for an operating pressure of up to 16 bar and can be easily installed between flanges according to DIN EN 1092-1. Thanks to its compact design, Type 640 can also be installed in an existing system with very little effort. In addition, we can realize operating pressures of 16 bar and more even with larger nominal diameters.

The standard version made of borosilicate glass is suitable for an operating temperature of up to 280°C. The system can also be used for larger nominal widths. 

Read on for more technical information and detailed views!

Technical data


  • Acrylic glass (PMMA)
  • Borosilicate glass (thermally hardened)


Intermediate flange version


  •  Acrylic glass 80°C
  • Borosilicate glass 280°C

Nominal pressure:

PN 16 (Borosilicate glass)

Nominal size:

DN 10-500 (other dimensions on request)


Optional versions are possible.

Section_view_type_640 Table_Dimensions_Type_640
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Intermediate flange sight glass type 640