Lumistar Flow sight glasses

Lumistar Flow sight glasses

Lumistar Flow sight glasses — borosilicate glass cylinder sight sections with DIN/ANSI flanges for reliable inline flow inspection (typ. 6 bar, up to 220 °C).

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Description

The Lumistar Flow sight glass is a robust, cylindrical glass sight assembly designed for inline observation of flow and filling level inside pipes. The product features a borosilicate glass cylinder mounted between two flanges and spacer shafts to provide a clear, 360° viewing window. It is ideal where continuous visual monitoring of liquid flow, level or product behaviour is required in process lines.

Why choose a Lumistar Flow sight glasses?

Lumistar Flow sight glasses deliver reliable, full-circumference visibility and proven durability for inline process monitoring. Built with borosilicate (DURAN) glass and robust stainless flanges, they offer superior thermal and chemical resistance, clear 360° viewing and long service life. The modular design makes installation, inspection and maintenance fast and cost-effective, while multiple flange standards (DIN/ANSI), gasket and alloy options let you tailor the unit to your pressure, temperature and hygiene requirements.

Product at a glance

  • Standard: Lumistar Flow sight glasses
  • Window: Sintered borosilicate glass , custom porosity on request.
  • Body: Stainless steel 304 / 316 housings; special alloys on request.

Typical specifications

 

Flow sight glass — Specifications

Type Lumistar Flow sight glass
Connecting flange : Flange according to DIN2642 (connection size PN10)
Length of construction DIN 3202F1
Temperature up to 220°C
Pressure approx. 6 bar (standard design). Higher pressure ratings are available with thicker glass or custom flange specification — please consult our engineers.
Certificates & testing

  • Material certificates (EN 10204-3.1 / 3.1B) and batch test reports available on request (additional charge may apply).

  • Pressure testing and inspection can be provided for project orders; third-party witness testing available.
Connecting flange & construction

  • Flange standard: Flange according to DIN 2642 (connection size PN10) or to customer specification (ANSI and other flange types available on request).

  • Length of construction: Standard modular length to DIN 3202F1; custom lengths can be supplied to suit installation.

  • The assembly consists of two link flanges, a borosilicate glass cylinder (DURAN), spacer shafts (stainless tubes) and gasket seals.
Installation

  • The flow sight glass bolts the joint flange with the matching gasket to the pipe or structural surface — tighten evenly to the recommended torque.

  • Install without thrust, pre-load or twist on the glass cylinder; support the piping to avoid mechanical loads on the sight assembly.

  • Follow gasket manufacturer torque recommendations and check bolt sequence for even compression.

Need a custom porosity or diameter? Contact us for a quote.

Advantages & special features

  • Clear, continuous 360° viewing area for reliable flow inspection.

  • Borosilicate DURAN glass for superior thermal and chemical resistance.

  • Modular construction — easy to install, inspect and service.

  • Custom lengths, ANSI flanges and impact-protected versions available.

Applications

  • Inline flow inspection for pipelines, filler lines, sight sections on tanks and vessels.

  • Widely used in food & beverage, dairy, chemical, cosmetic and pharmaceutical industries for process control and visual verification of flow quality.

Downloads

Lumistar Flow sight glasses— Datasheet (PDF):Lumistar Flow sight glasses

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