Tank Sight Glass type 127 | Noris

Tank Sight Glass Noris Type 127

The Noris Type 127 is a threaded sight glass designed for visual inspection in tanks, containers, and pipelines. Its geometry corresponds to a threaded pipe connection similar to DIN 11851. Product documentation classifies it under DIN standards, BSP connection, and PN 6 pressure class.

Operating Conditions

• Operating pressure: 6 bar
• Operating temperature: up to 220 °C
• Suitable for vacuum service
• Available sizes: DN 50, DN 65, DN 80, DN 100, DN 125
• Options: sight glass luminaire, wiper, higher pressure rating on request

Materials and Sealing

Welded ends are manufactured from stainless steel WN 1.4404 or 1.4301; slotted union nut from WN 1.4301. Glass options: borosilicate (DIN 7080) or soda-lime (DIN 8902). Sealing materials: silicone, Viton, EPDM, or PTFE, with asbestos-free protective layer.

Typical Applications

• Dairy, food processing, and brewing industry
• Beverage production
• Pharmaceutical and medical technology
• Process piping requiring direct observation of flow, color, foaming, or media clarity

Selection Criteria

Type 127 is selected where a threaded/hygienic connection is required instead of a flanged DIN 28121 sight glass. Gasket selection should consider temperature, CIP cleaning agents, chemical compatibility, and vacuum requirements. For media prone to deposits, a wiper or luminaire may be specified to improve inspection visibility.

FAQ

Is an actuator required?
No. This is a static inspection component. Any flushing or automation must be provided by external equipment.

How does it differ from Type 121?
Type 121 is a flanged sight glass per DIN 28121. Type 127 is threaded, with a connection similar to DIN 11851.

What is checked during maintenance?
Glass cleanliness, gasket condition, union nut, sealing surfaces, and signs of leakage after thermal cycling or CIP cleaning.