Sight glass for industrial applications Type 620K

monitoringborosilicate glassflange

Plastic tubular sight glass for monitoring flow in pipelines where metallic materials are unsuitable. Supplied fully assembled for maintenance-free operation. Options for plastic flange materials and elastomer seals prevent contact between the process medium and any steel parts.

Product information

• Construction: solid plastic flanges (PP, PVC or PVDF) encase a borosilicate glass tube sealed with NBR or Viton® O-rings; design avoids contact between process medium and steel parts
• Flange connections: compatible with DIN EN 1092-1 (adaptable to other flange standards on request)
• Delivered: fully assembled from factory; fitted components can be replaced if worn to reduce system downtime

Key options

• Nominal pressure: PN 10
• Maximum working pressure: up to 10 barg
• Temperature rating: heat-resistant up to 100 °C
• Media: suitable for liquid and gaseous media
• Nominal sizes available (DN): 25, 32, 40, 50, 65, 80, 100, 150

Dimensions (cross-section / flange data)

• DN 25: D = 115 mm, d = 32 mm, L = 160 mm, L1 = 46 mm, LK = 85 mm, n x d2 = 4 x ø14
• DN 32: D = 140 mm, d = 40 mm, L = 180 mm, L1 = 58 mm, LK = 100 mm, n x d2 = 4 x ø18
• DN 40: D = 150 mm, d = 50 mm, L = 200 mm, L1 = 70 mm, LK = 110 mm, n x d2 = 4 x ø18
• DN 50: D = 165 mm, d = 63 mm, L = 230 mm, L1 = 92 mm, LK = 125 mm, n x d2 = 4 x ø18
• DN 65: D = 185 mm, d = 75 mm, L = 290 mm, L1 = 116 mm, LK = 145 mm, n x d2 = 4 x ø18
• DN 80: D = 200 mm, d = 90 mm, L = 310 mm, L1 = 126 mm, LK = 160 mm, n x d2 = 8 x ø18
• DN 100: D = 220 mm, d = 110 mm, L = 350 mm, L1 = 160 mm, LK = 180 mm, n x d2 = 8 x ø18
• DN 150: D = 285 mm, d = 160 mm, L = 480 mm, L1 = 240 mm, LK = 240 mm, n x d2 = 8 x ø22

Technical specifications

• Model / type: 620K
• Materials: flange options polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF); tube: borosilicate glass
• Sealing: NBR or Viton® O-rings
• Flange standard: DIN EN 1092-1 (adaptable)
• Nominal pressure: PN 10 (max. working pressure up to 10 barg)
• Temperature resistance: up to 100 °C
• Suitable media: liquids and gases
• Nominal sizes: DN 25–150
• Delivery state: fully assembled