Sight Glasses

Flow indicators are used in steam and condensate systems for visual confirmation of flow, checking steam trap operation, and identifying continuous discharge, blockage, or unwanted live steam carryover. They are typically installed upstream or downstream of the steam trap, in condensate return lines, steam tracing circuits, manifolds, and auxiliary lines where local diagnosis is required without dismantling the pipework.

This category includes double-window, single-window, tubular, and ball-type flow indicators, with series such as ARI BR660 and Noris 020, 025, 050, 108, and 111. Selection is based on the service medium, operating pressure and temperature, visibility at the installation point, viewing direction, the need to distinguish liquid from gas flow, and maintainability. In steam service, attention should be given to thermal stress on the sight glass, gasket tightness, and possible fouling of the viewing area from oxides or condensate deposits.

DIN and ANSI versions are available, with pressure ratings including PN10, PN16, PN25, PN40, Class 150, 150 lbs, and 300 lbs, depending on type. End connections include BSP, NPT, flanged, socket weld, and butt weld, with references to DIN EN 1092, DIN EN 10226-1, ANSI B1.20.1, and EN ISO 9692 for selected designs. Body materials include grey cast iron EN-JL 1040 / EN-GJL-250, carbon steels 1.0425, 1.0460, 1.0619 / 1.0619+N, and stainless steels 1.4404, 1.4408, and 1.4571, selected according to pressure class, temperature range, corrosion allowance, and media compatibility.

Double window sight glass | ARI Ari-Armaturen - 1

Double window sight glass | ARI

Double window sight glass | ARI
Ari-Armaturen
ARI BR660 Dual-Sided Flow Indicator The ARI BR660 is a flow indicator featuring two borosilicate glass observation windows for visual flow inspection in pipelines. It has no moving parts and is primarily used for monitoring condensate, steam, and process liquids before steam traps or in lines requiring local flow indication. Technical Specifications...
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Sight Flow Indicators - 020 | Noris Noris Armaturen - 1

Sight Flow Indicators - 020 | Noris

Sight Flow Indicators - 020 | Noris
Noris Armaturen
Tubular Flow Indicator NORIS Bauform 20 The NORIS 020 is a tubular flow indicator with flanged connection, designed for visual monitoring of liquids and gases in horizontal or vertical pipelines. It serves as a local monitoring point for flow, filling, bubbles, drainage, or fluid presence in process networks. Operating Conditions Connections: DIN flanges...
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Sight Flow Indicators - 020-A | Noris Noris Armaturen - 1

Sight Flow Indicators - 020-A | Noris

Sight Flow Indicators - 020-A | Noris
Noris Armaturen
Tubular Flow Indicator NORIS Bauform 20-A The NORIS 020-A is a tubular flow indicator with ANSI 150 lbs RF flanges, designed for local visual monitoring of liquids and gases in horizontal or vertical pipelines. It is used when confirmation of flow presence, bubbles, fluid color, filling, or draining is required without a measuring instrument. Key...
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Sight Flow Indicators - 025 | Noris Noris Armaturen - 1

Sight Flow Indicators - 025 | Noris

Sight Flow Indicators - 025 | Noris
Noris Armaturen
Tubular Flow Indicator NORIS Bauform 25 The NORIS 025 is a tubular flow indicator featuring a Safety Seal-System sealing mechanism compliant with DIN 28121. It is installed in horizontal or vertical pipelines for visual monitoring of liquids and gases, without measurement instruments or electrical power. Operating Conditions Connection: DIN flanges PN10...
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Sight Flow Indicators - 025-A | Noris Noris Armaturen - 1

Sight Flow Indicators - 025-A | Noris

Sight Flow Indicators - 025-A | Noris
Noris Armaturen
Tubular Flow Indicator NORIS Bauform 25-A The NORIS 025-A is a tubular flow indicator equipped with ANSI 150 lbs flanges and a Safety Seal-System according to DIN 28121. It is designed for visual monitoring of liquids and gases in horizontal or vertical pipelines, without requiring electrical power or control signals. Technical Specifications Connection:...
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Sight Flow Indicators - 025-B | Noris Noris Armaturen - 1

Sight Flow Indicators - 025-B | Noris

Sight Flow Indicators - 025-B | Noris
Noris Armaturen
NORIS Bauform 25-B – Tubular Flow Indicator with Ball The NORIS 025-B is a dual-sided tubular flow indicator with DIN PN10/PN16 flanges and a Safety Seal-System according to DIN 28121. It is used in vertical pipelines for visual monitoring of liquids and gases. The flow must be from bottom to top, allowing the internal ball to rise and indicate flow...
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Sight Flow Indicators - 050 | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 050 | Noris Armaturen

Sight Flow Indicators - 050 | Noris Armaturen
Noris Armaturen
NORIS Bauform 50 – Single-Sided Flow Indicator with Ball The NORIS 050 is a ball-controller type flow indicator designed for local monitoring of low flow rates in liquids and gases. The white PTFE indicator ball starts moving at approximately 3 L/h, providing visual confirmation of flow or potential low-flow leakage. Operating Conditions Nominal...
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Sight Flow Indicators - 108 | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 108 | Noris Armaturen

Sight Flow Indicators - 108 | Noris Armaturen
Noris Armaturen
NORIS Type 108 – Dual-Sided Flow Indicator PN16 The NORIS 108 is a straight dual-sided flow indicator with DIN PN16 flanges. It is used for visual inspection of flow presence, pipeline filling, and fluid condition in industrial networks, without electrical power or automation signals. Technical Specifications Connection: DIN PN16 / DIN 2633 flanges...
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Sight Flow Indicators - 108-B | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 108-B | Noris Armaturen

Sight Flow Indicators - 108-B | Noris Armaturen
Noris Armaturen
NORIS Type 108-B – Dual-Sided Flow Indicator with Loose Flanges The NORIS 108-B is a straight-through dual-sided flow indicator designed for visual inspection of fluid filling and movement within pipelines. The "B" construction features loose connection flanges DIN 2642, PN10, distinguishing it from fixed-flange versions. Technical Specifications...
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Sight Flow Indicators - 108-S | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 108-S | Noris Armaturen

Sight Flow Indicators - 108-S | Noris Armaturen
Noris Armaturen
NORIS Bauform 108-S – Dual-Sided Flow Indicator with Welded Ends The NORIS 108-S is a straight dual-sided flow indicator with butt weld ends. It is used for visual inspection of filling and flow in pipelines without electrical signals or measuring instruments. Installation can be adapted to the line layout, maintaining the flow direction. Operating...
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Sight Flow Indicators - 111 | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 111 | Noris Armaturen

Sight Flow Indicators - 111 | Noris Armaturen
Noris Armaturen
NORIS Bauform 111 – Dual-Sided Flow Indicator Without Liquid Retention The NORIS 111 is a straight dual-sided flow indicator with flanged connection DIN PN16. Its body geometry is designed for horizontal installation, minimizing residual liquid retention, beneficial for lines that are drained, cleaned, or switch products. Technical Specifications...
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Sight Flow Indicators - 111-S | Noris Noris Armaturen - 1

Sight Flow Indicators - 111-S | Noris

Sight Flow Indicators - 111-S | Noris
Noris Armaturen
NORIS Bauform 111-S – Dual-Sided Flow Indicator with Butt Weld Ends The NORIS 111-S is a straight-through, dual-sided flow indicator with butt weld ends, designed for visual inspection of filling and flow in pipelines. Its body geometry minimizes residual liquid retention when installed horizontally, beneficial for discharge, cleaning, or product change...
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Sight Flow Indicators - 112 | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 112 | Noris Armaturen

Sight Flow Indicators - 112 | Noris Armaturen
Noris Armaturen
NORIS Type 112 – Double-Sided Flow Indicator PN16 The NORIS 112 is a straight-through, double-sided flow indicator with DIN flanges, designed for visual monitoring of filling and flow in industrial pipelines. In horizontal installations, its body geometry minimizes residual liquid retention, beneficial for discharge, cleaning, or product change lines....
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Sight Flow Indicators - 112-A | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 112-A | Noris Armaturen

Sight Flow Indicators - 112-A | Noris Armaturen
Noris Armaturen
NORIS Type 112-A – Dual-Sided Flow Indicator ANSI The NORIS 112-A is a straight-through dual-sided flow indicator with flanged connections according to ANSI 150 / 300 lbs. It is used for visual inspection of filling, flow presence, and fluid condition in process pipelines. In horizontal installations, the body geometry minimizes...
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Sight Flow Indicators - 112-S | Noris Noris Armaturen - 1

Sight Flow Indicators - 112-S | Noris

Sight Flow Indicators - 112-S | Noris
Noris Armaturen
NORIS Bauform 112-S – Dual-Sided Flow Indicator with Butt Weld Ends The NORIS 112-S is a straight-through, dual-sided flow indicator with butt weld ends. It is used for visual inspection of filling and flow in pipelines, without signal output or flow measurement function. In horizontal installations, the body geometry minimizes residual liquid retention...
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Sight Flow Indicators - 880 | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 880 | Noris Armaturen

Sight Flow Indicators - 880 | Noris Armaturen
Noris Armaturen
NORIS Type 880 – Double-Sided Flow Indicator DIN 3237 The NORIS 880 is a straight-through double-sided flow indicator with flanged connections according to DIN standards, available in pressure classes PN16, PN25, or PN40. It is used for local visual monitoring of liquids and gases in horizontal or vertical pipelines. Operating Conditions Construction...
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Sight Flow Indicators - 880-A | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 880-A | Noris Armaturen

Sight Flow Indicators - 880-A | Noris Armaturen
Noris Armaturen
NORIS Model 880-A – Dual-Sided Flow Indicator ANSI The NORIS 880-A is a straight dual-sided flow indicator with ANSI 150 or 300 lbs flanges. It is used for local visual inspection of liquids and gases in horizontal or vertical pipelines, maintaining flow direction. It is not a flow meter and does not provide an electrical control signal. Operating...
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Sight Flow Indicators - 880-A-K | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 880-A-K | Noris Armaturen

Sight Flow Indicators - 880-A-K | Noris Armaturen
Noris Armaturen
NORIS Model 880-A-K – ANSI Flow Indicator with Flap The NORIS 880-A-K is a straight-through, double-sided flow indicator with ANSI 150 or 300 lbs flanges and an internal indication flap. It is used for visual monitoring of liquids and gases in horizontal or vertical pipelines when simple observation of the fluid does not provide sufficient visual...
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Sight Flow Indicators - 880-A-RK/RP | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 880-A-RK/RP | Noris Armaturen

Sight Flow Indicators - 880-A-RK/RP | Noris Armaturen
Noris Armaturen
NORIS Model 880-A-RK/RP – ANSI Flow Indicator with Spinner The NORIS 880-A-RK/RP is a straight-through, dual-sided flow indicator featuring an internal spinner for visual monitoring of liquids and gases in horizontal or vertical pipelines. The flanged connection complies with ANSI 150 or 300 lbs, and flow direction must be observed during installation....
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Sight Flow Indicators - 880-D | Noris Noris Armaturen - 1

Sight Flow Indicators - 880-D | Noris

Sight Flow Indicators - 880-D | Noris
Noris Armaturen
NORIS Bauform 880-D – Dual-Sided Flow Indicator with Double Glass The NORIS 880-D is a straight-through flow indicator featuring double glass windows on each observation side. This construction is utilized when enhanced protection of the glass from external mechanical impact or installation environment is required, without altering the fundamental...
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Sight Flow Indicators - 880-HM | Noris Noris Armaturen - 1

Sight Flow Indicators - 880-HM | Noris

Sight Flow Indicators - 880-HM | Noris
Noris Armaturen
NORIS Bauform 880-HM – Flow Indicator with Heating Jacket The NORIS 880-HM is a straight-line sight flow indicator, based on the Bauform 880 series, featuring an integrated heating jacket. It is utilized when thermal losses or fluid cooling in the observation area need to be minimized. A suitable heating or thermostatic medium can circulate within the...
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Sight Flow Indicators - 880-I | Noris Noris Armaturen - 1

Sight Flow Indicators - 880-I | Noris

Sight Flow Indicators - 880-I | Noris
Noris Armaturen
NORIS Bauform 880-I – Flow Indicator with Internal Glass Washing The NORIS 880-I is a specialized dual-sided flow indicator from the 880 series, featuring an integrated spray head for cleaning the internal surface of glass windows. It is utilized when visibility may be compromised by deposits, condensation, colored fluids, or process contaminants....
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Sight Flow Indicators - 880-RK/RP | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 880-RK/RP | Noris Armaturen

Sight Flow Indicators - 880-RK/RP | Noris Armaturen
Noris Armaturen
NORIS Model 880-RK/RP – DIN Flow Indicator with Spinner The NORIS 880-RK/RP is a dual-sided inline flow indicator featuring an internal spinner for visual monitoring of liquids and gases in horizontal or vertical pipelines. The connection is flanged according to DIN standards, available in pressure classes PN16, PN25, or PN40. Operating Conditions...
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Sight Flow Indicators - 880-S | Noris Armaturen Noris Armaturen - 1

Sight Flow Indicators - 880-S | Noris Armaturen

Sight Flow Indicators - 880-S | Noris Armaturen
Noris Armaturen
NORIS Bauform 880-S – Flow Indicator with Butt Weld Ends The NORIS 880-S is a straight-through, double-sided flow indicator with butt weld ends. It is used for visual inspection of liquids and gases in horizontal or vertical pipelines where flange connections are not specified. The flow direction must be considered during installation. Technical...
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