Tank Sight Glasses

Sight level indicators for tanks are used for direct confirmation of liquid level, liquid presence, clarity, and possible interface formation in storage tanks, process vessels, and auxiliary systems. Selection should be based on design pressure, operating temperature, process fluid, chemical compatibility, corrosion conditions, installation position, and the required visual access during operation or maintenance.

This category includes Noris tank sight glasses, including types 118, 119, 120, 121, 121-A, 121-D, 121-I, 121-W, 127, 190, 195, 198, 220, 225, 230, 232, and 1205, as well as Tassalini and Mei sight glasses in W and R designs. Available configurations cover flanged or BSP connections, DIN or ANSI drilling, and pressure ratings from PN 2.5 to PN 25, as well as Class 300 and Class 600, depending on design and body construction.

Noris sight glasses type 118 are specified with flanged connection, DIN standard, PN 2.5 rating, and body materials 1.0038, 1.0425, 1.4541, or 1.4571. Material selection should be matched to the stored medium, vessel pressure, and corrosion allowance. Tassalini sight glasses are manufactured in AISI 304L or AISI 316L, with in-line or radial connections, Pyrex glass, optional external plexiglass shield, dedicated tie rods, and sealing arrangements intended to reduce mechanical loading and vibration transfer to the glass. Maximum operating pressure is 10 bar, with standard 120 grit surface finish.

The same range also includes double-window flow indicators with protective guard, Noris replacement sight indicators of types 120-D-HZ, 120-V, 121-H, 121-V, and 126-D-HZ, and Noris illuminators BKVLR and KEL for locations with limited visibility. During maintenance, the glass should be checked for cleanliness, gasket condition, bolt tightness, frame corrosion, external mechanical protection, and any fouling or deposits that may distort the true level indication or conceal leakage paths.

Tank Sight Glass type 118 | Noris | Philippopoulos s.a.

Tank Sight Glass type 118 | Noris

Tank Sight Glass type 118 | Noris
Noris Armaturen
Tank Sight Glass Noris Type 118 The Noris Type 118 is a circular low-pressure sight glass designed for visual inspection and illumination of the interior of closed vessels, such as tanks, boilers, and silos. The assembly is intended for direct welding to the vessel shell and consists of a base, flange-type cover, glass disc, gaskets, and bolts. Operating...
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Tank Sight Glass type 119 | Noris | Philippopoulos s.a.

Tank Sight Glass type 119 | Noris

Tank Sight Glass type 119 | Noris
Noris Armaturen
Tank Sight Glass Noris Type 119 The Noris Type 119 is a circular tank sight glass, PN 6, designed for visual inspection or illumination of the interior of closed vessels such as tanks, boilers, and silos. Installation is performed by welding the base flange directly to the vessel shell. Operating Conditions Operating pressure: up to 6 bar Pressure...
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Tank Sight Glass type 120 | Noris | Philippopoulos s.a.

Tank Sight Glass type 120 | Noris

Tank Sight Glass type 120 | Noris
Noris Armaturen
Tank Sight Glass Noris Type 120 The Noris Type 120 is a circular tank sight glass designed for direct welding onto the shell of a closed vessel. It is used for visual inspection or illumination of the internal space in tanks, boilers, and silos where localized monitoring of foaming, flow, deposits, color, or liquid condition is required. Technical...
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Tank Sight Glass - Fittings - 121 | Noris Armaturen | Philippopoulos s.a.

Tank Sight Glass - Fittings - 121 | Noris Armaturen

Tank Sight Glass - Fittings - 121 | Noris Armaturen
Noris Armaturen
Tank Sight Glass Noris Type 121 The Noris Type 121 is a circular sight glass fitting per DIN 28121, designed for installation on existing DIN flanges. It is supplied pre-assembled and is bolted directly to the vessel’s flanged nozzle, with no welding required during installation. Operating Conditions Operating pressure: 10 bar or 25 bar Nominal sizes: DN...
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Tank Sight Glass type 121-A | Noris | Philippopoulos s.a.

Tank Sight Glass type 121-A | Noris

Tank Sight Glass type 121-A | Noris
Noris Armaturen
Tank Sight Glass Noris Type 121-A The Noris Type 121-A is a circular sight glass assembly designed for direct mounting on existing ANSI flanges. It is used for visual inspection or illumination of the interior of closed vessels, such as tanks, boilers, and silos. The unit is supplied pre-assembled and bolts directly onto the flange connection. Technical...
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Tank Sight Glass type 121-D | Noris | Philippopoulos s.a.

Tank Sight Glass type 121-D | Noris

Tank Sight Glass type 121-D | Noris
Noris Armaturen
Tank Sight Glass Noris Type 121-D The Noris Type 121-D is a circular sight glass conforming to DIN 28121, designed for installation on existing DIN flanges. The 121-D variant differs from Type 121 by incorporating a dual safety window arrangement: each borosilicate glass disc is rated for full design pressure, ensuring that in the event of one disc...
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Tank Sight Glass type 121-W | Noris | Philippopoulos s.a.

Tank Sight Glass type 121-W | Noris

Tank Sight Glass type 121-W | Noris
Noris Armaturen
Tank Sight Glass Noris Type 121-W The Noris Type 121-W is a circular sight glass conforming to DIN 28121, designed for installation on existing flanges. It features an integrated wiper on the internal glass surface. Based on Bauform 121, this variant is specified where process media form films, solid deposits, or clouding that restrict visual inspection....
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Tank Sight Glass type 127 | Noris | Philippopoulos s.a.

Tank Sight Glass type 127 | Noris

Tank Sight Glass type 127 | Noris
Noris Armaturen
Tank Sight Glass Noris Type 127 The Noris Type 127 is a threaded sight glass designed for visual inspection in tanks, containers, and pipelines. Its geometry corresponds to a threaded pipe connection similar to DIN 11851. Product documentation classifies it under DIN standards, BSP connection, and PN 6 pressure class. Operating Conditions Operating...
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Tank Sight Glass type 220 | Noris | Philippopoulos s.a.

Tank Sight Glass type 220 | Noris

Tank Sight Glass type 220 | Noris
Noris Armaturen
Tank Sight Glass Noris Type 220 The Noris Bauform 220 is a rectangular sight glass designed for direct welding onto tanks, vessels, and silos. It is intended for local visual observation of liquid surfaces and is not a continuous level measurement device. Operating Conditions Nominal pressure: 16 bar / PN 16 Temperature: up to 243 °C, suitable for...
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Tank Sight Glass type 225 | Noris | Philippopoulos s.a.

Tank Sight Glass type 225 | Noris

Tank Sight Glass type 225 | Noris
Noris Armaturen
Tank Sight Glass Noris Type 225 The Noris Bauform 225 is a longitudinal rectangular sight glass designed for direct welding onto tanks, vessels, and silos. It is intended for local visual observation of liquid level or interface, not for continuous level measurement or remote indication. Operating Conditions Design pressure: 3 / 6 / 25 bar Temperature:...
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Tank Sight Glass type 230 | Noris | Philippopoulos s.a.

Tank Sight Glass type 230 | Noris

Tank Sight Glass type 230 | Noris
Noris Armaturen
Type 230 Sight Glass with Weld-Neck Flanges The Noris Type 230 is a circular sight glass with weld-neck flanged ends, designed for welded installation on tanks, vessels, and pipelines. It is intended for direct visual inspection of flow, liquid or gas presence, color, foaming, and medium clarity. Documentation specifies suitability for both liquid and gas...
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Tank Sight Glass type 232 | Noris | Philippopoulos s.a.

Tank Sight Glass type 232 | Noris

Tank Sight Glass type 232 | Noris
Noris Armaturen
Type 232 Noris Sight Glass with Male Thread The Noris Bauform 232 is a threaded sight glass with a male G / BSP connection, designed for direct installation into threaded ports on tanks, pipelines, or vessels. It is used for local visual inspection of flow, liquid or gas presence, color, foaming, and medium clarity in process applications. Operating...
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Tank Sight Glass type 1205 | Noris | Philippopoulos s.a.

Tank Sight Glass type 1205 | Noris

Tank Sight Glass type 1205 | Noris
Noris Armaturen
Noris Type 1205 – Manhole Cover with Integrated Sight Glass The Noris Type 1205 is a manhole or inspection cover equipped with an integrated sight glass. It is specified where both vessel access and direct visual inspection are required, eliminating the need for a separate sight glass opening. The design is compatible with DIN 28120 installation...
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Sight glass light fitting type BKVLR | Noris | Philippopoulos s.a.

Sight glass light fitting type BKVLR | Noris

Sight glass light fitting type BKVLR | Noris
Noris Armaturen
Indicator Sight Glass Luminaire Noris BKVLR The Noris BKVLR is a compact stainless steel luminaire designed for illumination of sight glasses in non-hazardous areas, where no explosion-proof classification is required per the available technical datasheet. It is used in applications where observation of level, flow, foaming, or medium color requires...
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Sight glass light fitting type KEL | Noris | Philippopoulos s.a.

Sight glass light fitting type KEL | Noris

Sight glass light fitting type KEL | Noris
Noris Armaturen
Indicator Glass Luminaire Noris KEL The Noris KEL is a luminaire designed for tank sight glasses and sight flow indicators. It enables combined illumination and observation through a single glass port, suitable for both safe and hazardous (Ex) areas. Technical documentation classifies it as an EX-light fitting; specific Ex/ATEX certification must be...
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Spray System for Sight Glass type 121-I | Noris | Philippopoulos s.a.

Spray System for Sight Glass type 121-I | Noris

Spray System for Sight Glass type 121-I | Noris
Noris Armaturen
Spray System for Sight Glass Noris Type 121-I The Noris Type 121-I is a spray assembly designed for circular tank sight glasses according to DIN 28121. It is not a standalone level gauge, but an auxiliary device for cleaning or rinsing the internal glass surface in cases of contamination by foam, solids, deposits, or condensates. Configurations Type A...
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Glass Gauge Cleaning System type 190 | Noris | Philippopoulos s.a.

Glass Gauge Cleaning System type 190 | Noris

Glass Gauge Cleaning System type 190 | Noris
Noris Armaturen
Noris Type 190 – Glass Gauge Cleaning System The Noris Bauform 190 is not a standalone glass gauge. It is a mechanical wiper system for cleaning the glass surface of tank level gauges according to DIN 28120, specifically where process media cause crystallization, dust, sludge, product film, or deposits. The system can be integrated into Noris Bauform 118,...
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Side-Mounted Sight Glass Wiper type 195 | Noris | Philippopoulos s.a.

Side-Mounted Sight Glass Wiper type 195 | Noris

Side-Mounted Sight Glass Wiper type 195 | Noris
Noris Armaturen
Noris Type 195 – Side-Mounted Sight Glass Wiper The Noris Bauform 195 is a mechanical wiper designed for cleaning the internal surface of sight glasses, with side entry installation. It is not a standalone sight glass or level gauge. The device is used where visibility is reduced due to condensate, product films, foam, solids, or deposits in pressure or...
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Glass Gauge Cleaning Sprayer type 198 | Noris | Philippopoulos s.a.

Glass Gauge Cleaning Sprayer type 198 | Noris

Glass Gauge Cleaning Sprayer type 198 | Noris
Noris Armaturen
Noris Type 198 – Glass Gauge Cleaning Sprayer The Noris Bauform 198 is an internal spray cleaning device for glass gauge surfaces. It is not a standalone sight glass and does not function as a level measurement instrument. The unit is specified for applications where the glass indicator surface is contaminated by foam, condensate, dust, salts, slurry, or...
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Sight Flow Indicators - Protective Fence | Noris | Philippopoulos s.a.

Sight Flow Indicators - Protective Fence | Noris

Sight Flow Indicators - Protective Fence | Noris
Noris Armaturen
Protective Mesh Guard Noris for Sight Flow Indicators The Noris protective mesh guard provides mechanical protection for glass plates in sight flow indicators and circular tank sight glasses. It is not a standalone indicator or measuring device; rather, it is installed externally to limit glass damage from impact, tools, metallic objects, or operational...
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Sight Glasses | Tassalini | Philippopoulos s.a.

Sight Glasses | Tassalini

Sight Glasses | Tassalini
Tassalini
Tassalini Sight Glasses Tassalini sight glasses are used for direct visual inspection of flow, color, bubbles, foaming, presence of solids, and media clarity in process lines or vessel side connections. Available in in-line or radial configurations, with wetted metallic components in AISI 304L or AISI 316L stainless steel. Construction Body: Stainless...
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Tank Sight Glass type W | Mei | Philippopoulos s.a.

Tank Sight Glass type W | Mei

Tank Sight Glass type W | Mei
Mei Valvole
Tank Sight Glass MEI Type W The MEI Type W is a circular sight glass for tanks and pipelines, designed for welded installation on vessel shells or process lines. It is used for local visual inspection of flow, liquid level, color, foaming, media clarity, or presence of solids. This device is not intended for continuous level measurement. Technical...
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Tank Sight Glass type R | Mei | Philippopoulos s.a.

Tank Sight Glass type R | Mei

Tank Sight Glass type R | Mei
Mei Valvole
MEI Type R Tank Sight Glass The MEI Type R is a rectangular sight glass designed for installation on tanks and pipelines, typically by welded mounting to the vessel wall or process line. It is intended for local visual inspection of liquid level, flow, foaming, color, deposits, or presence of solids. This device is not suitable for continuous level...
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Tank Sight Glass type 120-D-HZ | Noris | Philippopoulos s.a.

Tank Sight Glass type 120-D-HZ | Noris

Tank Sight Glass type 120-D-HZ | Noris
Noris Armaturen
Sight Glass Noris Type 120-D-HZ The Noris Bauform 120-D-HZ is a specialized circular tank sight glass featuring double safety glazing and integrated heating. It is designed for visual inspection of vessel interiors where the external glass surface may fog due to humidity or temperature differentials. Documentation refers to this as “safe...
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