Borosilicate glass sight glass Type 590

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Product summary
The three-way flow sight glass Type 590 is a welded sight glass designed for installation between flanges (DIN EN 1092-1) for operating pressures up to 400 barg. It is intended for visual monitoring of liquid and gaseous media and is available in multiple nominal sizes and pressure ratings.

Key features

• Welded construction for retrofit installation and increased mechanical strength.
• Flange connections in accordance with DIN EN 1092-1.
• Suitable for liquid and gaseous media.
• Standard sight glass: borosilicate glass (standard temperature rating up to 280 °C).
• With mica protection disc: temperature resistance up to 300 °C; up to 320 °C with MAXOS® safety sight glasses (DIN 7080).

Available nominal sizes (DN)

• DN 50
• DN 65
• DN 80
• DN 100
• DN 125
• DN 150
• DN 200

Available nominal pressures (PN)

• PN 16
• PN 40
• PN 63
• PN 100
• PN 160
• PN 250
• PN 320
• PN 400

Temperature options (examples)

• 80 °C
• 130 °C
• 150 °C
• 175 °C
• 180 °C
• 200 °C
• 280 °C
• 300 °C
• 320 °C

Options / Accessories

• Wiper SGW with PTFE or silicone blade
• LED lighting for Ex and non-Ex areas
• FEP or Halar® protective coatings
• Mica protection discs
• Double glazing Type 590D (MAXOS® safety options)
• Special constructions / custom production possible
• Accessories examples: LED lights, FEP protective screens, round mica discs

Dimensions / drawing notes

• Face-to-face length: DIN EN 558-1 FTF 2 (standard lengths).
• Flange dimensions: DIN EN 1092-1.
• Free view (D1) — typical values by DN: DN 50 → 100 mm; DN 65 → 150 mm; DN 80 → 175 mm; DN 100 → 175 mm; DN 125 → 175 mm; DN 150 → 175 mm; DN 200 → 240 mm.
• Dimensions correspond to PN 16; other pressure ratings may change dimensions. Custom dimensions and other standards available on request.

Certifications & quality

• Manufactured by ACI Industriearmaturen GmbH; certified quality (e.g. TÜV / ISO 9001 references on product page).

Technical specifications

• Model: Type 590 (welded construction, 3-way)
• Manufacturer / brand: ACI Industriearmaturen GmbH
• Operating pressure: up to 400 barg (PN 16 – PN 400 options)
• Nominal sizes: DN 50 – DN 200
• Flange connection standard: DIN EN 1092-1
• Face-to-face length standard: DIN EN 558-1, FTF 2
• Standard glass: borosilicate (max. operating temperature up to 280 °C)
• Enhanced temperature with mica protection: up to 300 °C; with MAXOS® safety sight glasses up to 320 °C
• Sealing: flat gaskets from a wide range of >50 materials (fiber, PTFE (Teflon®), NBR, novaphit® MST-XP, KlingerSil® C4400, etc.)
• Options: wiper blades, LED lighting (Ex & non-Ex), protective coatings (FEP, Halar®), mica discs, double glazing 590D, special constructions
• Suitable media: liquid and gaseous