Vessel sight glass Type 321

sanitarymonitoringfor chemicals

A flange-mounted circular sight glass fitting (Type 321) for observation or illumination of vessel interiors, designed according to DIN 28121. The fitting is delivered pre-assembled for direct flange mounting and can be replaced as a whole if the glass is damaged.

Options

• Wiper SGW with PTFE or silicone wiper blade
• LED light for Ex and non-Ex areas
• Spraying device SVII
• FEP or Halar® coating
• Mica protection disc
• Special constructions on request

Features / Technical specifications

• Standard: Design according to DIN 28121.
• Mounting: Screwed onto flanges according to DIN EN 1092-1; delivered pre-assembled for direct mounting.
• Working pressure: available for PN 10 and PN 25 (max. 25 barg).
• Nominal sizes: DN 40 - DN 200.
• Temperature rating: selectable options including 80 °C, 130 °C, 150 °C, 175 °C, 180 °C, 200 °C (heat resistant up to 200 °C).
• Materials: Flanges made from stainless steels 1.4571 (316Ti) or 1.4404 (316L).
• Glass: MAXSO® borosilicate glass according to DIN 7080 (chemically highly resistant borosilicate).
• Sealing: Media-side PTFE-coated encased corrugated ring gasket located in the force closure to align flange parts and protect the glass (prevents gasket settling; no on-site retightening required).
• Application suitability: Suitable for liquid and gaseous media; suitable for food, acids, alkalis and most aggressive chemicals (additional protection via mica plate or coatings if required).
• Serviceability: Entire fitting can be replaced with little effort if the glass is damaged.
• Accessories available: Sight glass wiper, LED lights (various designs), FEP protective screen / coating, spraying devices (e.g. SV2/SVII), round mica discs.

Dimensions (PN 10)

• DN 40 → Di 48 mm; H 36 mm; Da 150 mm; L 18 mm; K 110 mm; Weight 3.8 kg
• DN 50 → Di 65 mm; H 38 mm; Da 165 mm; L 18 mm; K 125 mm; Weight 4.6 kg
• DN 80 → Di 80 mm; H 46 mm; Da 200 mm; L 18 mm; K 160 mm; Weight 8.2 kg
• DN 100 → Di 100 mm; H 46 mm; Da 220 mm; L 18 mm; K 180 mm; Weight 9.3 kg
• DN 125 → Di 125 mm; H 54 mm; Da 250 mm; L 18 mm; K 210 mm; Weight 13.8 kg
• DN 150 → Di 125 mm; H 54 mm; Da 285 mm; L 22 mm; K 240 mm; Weight 19.5 kg
• DN 200 → Di 150 mm; H 54 mm; Da 340 mm; L 22 mm; K 295 mm; Weight 28.7 kg

Dimensions (PN 25)

• DN 40 → H 38 mm; Da 150 mm; L 18 mm; K 110 mm; Weight 4.0 kg
• DN 50 → H 41 mm; Da 165 mm; L 18 mm; K 125 mm; Weight 5.0 kg
• DN 80 → H 50 mm; Da 200 mm; L 18 mm; K 160 mm; Weight 8.9 kg
• DN 100 → H 59 mm; Da 235 mm; L 22 mm; K 190 mm; Weight 14.0 kg
• DN 125 → H 66 mm; Da 270 mm; L 26 mm; K 220 mm; Weight 20.0 kg
• DN 150 → H 66 mm; Da 300 mm; L 26 mm; K 250 mm; Weight 26.9 kg
• DN 200 → H 66 mm; Da 360 mm; L 26 mm; K 310 mm; Weight 39.3 kg