Sight glass for industrial applications Type 640

monitoringborosilicate glassflange

The intermediate flange tubular sight glass Type 640 is a compact in-line solution for visual process monitoring of media in pipelines, designed for installation between V-flanges (V-flange type 11) according to DIN EN 1092-1. It is suitable for liquid and gaseous media and can be configured for a range of nominal sizes, pressures and temperatures.

Design & Applications

• Intermediate (in-line) sight glass for installation between V-flanges (V-flange type 11) according to DIN EN 1092-1.
• Compact solution enabling space-saving integration into existing systems.
• Applicable to liquid and gaseous media.

Materials & Temperature / Pressure

• Standard material: thermally hardened borosilicate glass — high resistance to thermal and chemical stress; standard maximum operating temperature up to 280 °C.
• Alternative material: acrylic glass (indicated in table for some properties).
• Standard working pressure: up to 16 barg (depending on nominal size; higher operating pressures over 16 barg possible for larger nominal sizes in specific configurations).

Available nominal sizes (DN)

• DN 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500

Temperature options

• 80 °C, 130 °C, 150 °C, 175 °C, 180 °C, 200 °C, 280 °C

Options

• FEP coating or Halar® coating.
• Custom total lengths available on request.

Dimensions & Data (excerpt from product drawing table; weights given for L = 50 mm)

• Table header: DN — Di [mm] — Da [mm] — Weight² [kg] — Weight³ [kg] — PS² [barg] — PS³ [barg]
• DN 10: Di 14 mm — Da 40 mm — Weight² 0.13 kg — Weight³ 0.07 kg — PS² 16 barg — PS³ 16 barg
• DN 15: Di 18 mm — Da 45 mm — Weight² 0.16 kg — Weight³ 0.08 kg — PS² 16 barg — PS³ 16 barg
• DN 20: Di 22 mm — Da 58 mm — Weight² 0.27 kg — Weight³ 0.13 kg — PS² 16 barg — PS³ 16 barg
• DN 25: Di 29 mm — Da 68 mm — Weight² 0.36 kg — Weight³ 0.18 kg — PS² 16 barg — PS³ 16 barg
• DN 32: Di 38 mm — Da 79 mm — Weight² 0.46 kg — Weight³ 0.22 kg — PS² 16 barg — PS³ 16 barg
• DN 40: Di 44 mm — Da 88 mm — Weight² 0.56 kg — Weight³ 0.27 kg — PS² 16 barg — PS³ 16 barg
• DN 50: Di 55 mm — Da 102 mm — Weight² 0.71 kg — Weight³ 0.34 kg — PS² 16 barg — PS³ 16 barg
• DN 65: Di 71 mm — Da 122 mm — Weight² 0.94 kg — Weight³ 0.46 kg — PS² 16 barg — PS³ 16 barg
• DN 80: Di 83 mm — Da 138 mm — Weight² 1.16 kg — Weight³ 0.58 kg — PS² 16 barg — PS³ 16 barg
• DN 100: Di 108 mm — Da 158 mm — Weight² 1.27 kg — Weight³ 0.62 kg — PS² 16 barg — PS³ 10 barg
• DN 125: Di 132 mm — Da 188 mm — Weight² 1.71 kg — Weight³ 0.83 kg — PS² 16 barg — PS³ 10 barg
• DN 150: Di 160 mm — Da 212 mm — Weight² 1.85 kg — Weight³ 0.90 kg — PS² 16 barg — PS³ 10 barg
• DN 200: Di 208 mm — Da 268 mm — Weight² 2.73 kg — Weight³ 1.32 kg — PS² 16 barg — PS³ 8 barg
• DN 250: Di 260 mm — Da 320 mm — Weight² 3.28 kg — Weight³ 1.61 kg — PS² 10 barg — PS³ 8 barg
• DN 300: Di 310 mm — Da 378 mm — Weight² 4.41 kg — Weight³ 2.17 kg — PS² 10 barg — PS³ 8 barg
• DN 350: Di 341 mm — Da 430 mm — Weight² 6.20 kg — Weight³ 3.18 kg — PS² 10 barg — PS³ 6 barg
• DN 400: Di 392 mm — Da 482 mm — Weight² 7.10 kg — Weight³ 3.64 kg — PS² 10 barg — PS³ 6 barg
• DN 450: Di 443 mm — Da 532 mm — Weight² 7.80 kg — Weight³ 4.02 kg — PS² 10 barg — PS³ 6 barg
• DN 500: Di 494 mm — Da 585 mm — Weight² 8.90 kg — Weight³ 4.55 kg — PS² 10 barg — PS³ 6 barg
• Notes: ² = Borosilicate glass; ³ = Acrylic glass; weights in [kg] for L = 50 mm; ⁵ = max. operating pressure in [barg]. Other materials, sizes, lengths and flange standards on request.

Characteristics / Specifications

• Model / series: Type 640 (intermediate tubular sight glass).
• Flange standard: V-flange type 11 according to DIN EN 1092-1 (intermediate flange design).
• Nominal sizes: DN 10 – DN 500 (specific sizes listed above).
• Standard max. operating pressure: up to 16 barg (depending on DN; see per-size PS values), acrylic glass variants have differing PS ratings as per table.
• Standard max. operating temperature (borosilicate glass): up to 280 °C.
• Standard material: thermally hardened borosilicate glass; acrylic glass available for certain configurations.
• Available options: FEP or Halar® coating; custom total lengths and custom manufacturing on request.
• Intended for visual monitoring of liquid and gaseous media.