Sight glass for industrial applications Type 390

for vesselsmonitoringstainless steel

The round tank sight glass Type 390 is a welded fitting for pipe sockets or container walls that permits visual inspection and illumination of the container interior. The sight glass is clamped between two stainless steel flanges and sealed with flat gaskets; the standard sight glass material is borosilicate glass according to DIN 7080.

Structure / Components

• Screws
• Cover flange
• Glass cushion
• Sight glass (borosilicate glass DIN 7080)
• Gasket
• Base flange
• Nuts

Options

• Wiper SGW with PTFE or silicone wiper blade
• LED lamp for Ex and non-Ex areas
• FEP or Halar® coating
• Mica protection disc
• Custom made designs

Applications & highlights

• Suitable for liquid and gaseous media
• Custom made design possible
• Accessories available (e.g. wipers, mica discs, LED lights, protective coatings)
• More than 50 gasket materials available to meet process requirements
• Standard housing material: stainless steel 1.4571 (316Ti)

Technical data (selectable)

• Nominal sizes: DN 15 - 350 (individual sizes: 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350)
• Nominal pressure PN: 16, 40, 63, 100, 160, 250, 320
• Temperature options (selection): 80°C, 130°C, 150°C, 175°C, 180°C, 200°C, 280°C, 300°C, 320°C, 400°C

Characteristics / Technical specifications

• Model / denomination: Type 390
• Housing material: stainless steel 1.4571 (316Ti)
• Sight glass material: borosilicate glass (DIN 7080) — alternative glass materials available on request
• Sealing: flat gaskets from an extensive range of materials (examples: PTFE (Teflon®), NBR, novaphit® MST-XP, KlingerSil® C4400 and other brand seals)
• Maximum indicated pressure rating: up to 320 barg (depending on configuration)
• Typical heat resistance: stated up to 280 °C for standard configurations (higher temperature protection possible with mica discs or alternative solutions)
• Designed for welding ends according to DIN EN 1092-1 type 11
• Available accessories: round mica discs, sight glass wipers, LED lights, FEP protective screens/coatings
• Customised designs and coatings (FEP, Halar®) to protect against aggressive chemicals or alkalis
• Option to include wiper (SGW) and lighting for improved visibility and maintenance