Continental Trade Sp. z o. o.


Flow sight glasses type 581 acc. DIN 28121


The ACI flow sight glass with sealing in the force shunt Type 581 is a flow sight glass with weld ends and PTFE-coated corrugated ring seal.

The sight glasses consist of safety borosilicate glass according to DIN 7080 and are sealed with a PTFE-coated corrugated ring seal according to DIN 28121.

Due to the completely closed glass frame, the sight glass pane is best possible protected laterally against damage. Like our tank sight glass type 321, the type 581 can be equipped with additional cleaning equipment such as wipers or spraying devices. Luminaires based on halogen or LED light sources with and without ATEX approval are also available ex works.

As additional protection against heat or alkaline media, the installation of a mica disc is also possible with our flow sight glass type 581.

For temperatures outside the approved operating range of up to 200°C of the PTFE-encapsulated corrugated ring seal, we also supply Type 581 on request with a graphite composite seal instead, in order to make full use of the maximum operating temperature of 280°C for the glass pane. For even higher temperatures, quartz glass viewing windows are also available at an extra charge.

The housing of the flow sight glass type 581 can be manufactured according to your requirements from a variety of steel and stainless steel alloys with pressure equipment approval such as P265GH or 1.4571. Special materials such as Hastelloy are also available on request.

Read on for more technical information and detailed product views!




Body made of:
1.4571, 1.4539, 1.4404 or P235GH and many more.

Glass plates:
borosilicate glass DIN7080 or METAGLAS

PTFE enveloped corrugated ring system

straight form with sealing in the force shunt

Nominal size:

Nominal pressure:
PN10, PN16, PN25

max. 200°C

Optional versions are possible.

Watch our animation video, here you can see the structure of our flow sight glass type 581 perfectly

Download data sheet.

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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