Metal-fused sight glasses

Metal-fused sight glasses

Metal-fused sight glasses that will never let you down. For decades. Under the toughest conditions.

We have a complete range of metal-fused sight glasses, which are used worldwide for safe process observation. Our metal-fused sight glasses meet the highest quality standards – according to our quality commitment “Swiss Excellence – Since 1936”.

Metal-fused sight glasses consist of a glass plate that is fused into a metal ring. The result is an inseparable unit, consisting of a glass plate surrounded by a metal ring. As such, the metal-fused sight glass behaves according to the principle of “leak before breakage” (i.e., in the event of damage, the metal-fused sight glass shows surface cracks, but total failure does not occur). In addition, the metal-fused sight is free of gaps/ dead space, which prevents deposits.

For these reasons, metal-fused sight glasses are used as safety solutions, in case of hazardous media, and in sterile environments, where deposits must be avoided due to hygienic reasons.

Requirements

Our portfolio consists of ten product series that cover all common requirements. Here is an overview of the possibilities:

(1) Versions/ product series:

As sight glass plates or flanges: For circular sight glasses, flow indicators, weld neck nozzles, base flanges and pipe fittings, according to DIN or ANSI
For sterile environments: For clamp connections with Tri-Clamp or NA-Connect™, for VARIVENT®-In-Line housings, for aseptic pipe fittings/ connections, block flanges and Ingold spigots
As screwed sight glasses: For tube fittings, fittings with threads and NPT fittings
(2) Sizes/ application:

Nominal sizes: DN 10 to DN 300, or 0.5” to 12”
Operating pressure: Up to 64 bar (depending on the materials/ design, higher operating pressure possible)
Operating temperature: –60°C to +300°C (depending on the materials)
(3) Possible combinations:

With central hole for wipers
With adapter ring for light fittings
With lateral hole for light fittings or camera systems
(4) Materials:

Metal ring: Usually 1.4462 or 2.4602 (others on request)
Glass plate: Usually borosilicate/ DIN 7080 or soda lime/ DIN 8902 (others on request)
(5) Machining/ special tests (on request):

Hydraulic pressure test
Mechanical impact test
Mechanical polishing
Electropolishing
Concave grinding on one or both sides (to increase robustness, in particular in case of temperature fluctuations)

Do you have further requirements? Please contact us at any time. We will be happy to find a solution together.

Why Max Müller?

Safety. All our metal-fused sight glasses are 100% developed and manufactured in Germany, according to the highest quality standards. Therefore, our products will never let you down.

Reliability. Founded in 1936, MAX MÜLLER has grown into one of the world‘s leading manufacturers of process observation equipment. Therefore, we will always be there for you.

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Accessories

We have the following accessories for metal-fused sight glasses:

Light fittings

High-quality light fittings and timers, made of stainless steel or aluminium, for either [Ex] or non-[Ex] applications

Wipers and motorized wipers

Central and lateral wipers for sight glasses and metal-fused sight glasses, manual or pneumatic, up to 16 bar and with vacuum

Camera systems

High-quality digital cameras, made of stainless steel, for either [Ex] or non-[Ex] applications