Sight Glasses & Visual Indicators

Installed directly in the pipeline, sight glasses and visual flow indicators give operating personnel immediate, power-free confirmation of flow presence, flow direction, and media condition at a glance. The robust, maintenance-free design requires no signal processing or instrumentation, making them a reliable and cost-effective solution for routine flow verification in hydraulic systems, cooling circuits, and industrial fluid handling applications.
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Product Overview (11)

Flow indicator for water applications up to 60 l/min M1J

Flow indicator for water applications with 0.4...60 l/min H2O ranges, DN 8...25 and G 1/4...G 1 female threads; it operates without electrical power and separates the display unit hermetically from the medium.

Mechanical flow indicator for water up to 30 l/min OT

Mechanical flow indicator for water flow control, covering 0.6...30 l/min H2O across five ranges with PN 10 pressure rating, G3/4A or G1A process connection and an integrated regulating valve with setting scale.

Flow indicator for liquid line visual monitoring OW

Flow indicator for visual checking of water and oils in pipelines, covering DN 8..50 / G 1/4..G 2 with Qmax. up to 250 l/min, PN 6 and any-position installation in a brass body.

Mechanical flow indicator for liquid media up to 100 l/min PO

Mechanical flow indicator for liquid media, with rotor-based flow indication for H2O ranges from 0.1 - 1.5 to 4.0 - 100.0 l/min, DN 10 or DN 25 sizes and PN 16 pressure resistance.

Flow indicator for liquid media, DN 8 to DN 25 RL

Flow indicator for liquid media with rotor indication for water and oils, DN 8 to DN 25, G1/4 to G1 internal threads, 0.5...5.0 l/min H2O rotor start and up to 26.5 l/min H2O recommended Qmax.

Mechanical flow indicator for liquid media, DN 15 to DN 50 SK

Mechanical flow indicator for liquid media, showing water flow from 3 to 195 l/min across DN 15 to DN 50 sizes, with G 1/2 to G 2 female threads, PN 16 bar pressure resistance and natural glass windows.

Flow indicator for liquid lines, PN 16 bar WO1

Flow indicator for liquid lines showing water and oils up to 220 l/min. It uses a 360° visible borosilicate glass window, internal wiper and G 1/4..G 11/2 internal thread options.

Flow indicator for liquid and gas lines, PN 16 WR1

Flow indicator for liquid and gas lines with rotor-based indication from 0.7 to 700 l/min. The 360° visible rotor, internal wiper, G 1/4...G 1 1/2 threads and brass or stainless steel bodies support line checks.

Mechanical flow indicator for liquid media, PN 16 FQ

Mechanical flow indicator for liquid media, with measuring ranges from 2.1 - 17 to 2.1 - 24 l/min H2O across DN 15 - 25 sizes, G 1/2 to G 1 female threads, PN 16 pressure resistance and natural glass windows.

Mechanical flow indicator for water up to 65 l/min FR

Mechanical flow indicator for water flow shows 2.5...65 l/min across DN 15..25 variants with G 1/2...G 1 female threads, PN 16 pressure resistance and twin rotors visible behind soda-lime glass.

Mechanical flow indicator for liquids and gases BL

Mechanical flow indicator for liquids and gases, with DN 8..40 sizes, G 1/4..G 1 1/2 female thread, 0.3..23 l/min display range, PN 16 rating and stainless steel construction.

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