Sight Flow Indicators - 911-S | Noris

NORIS Bauform 911-S – Dual-Sided Flow Indicator with Eccentric Butt Weld Ends

The NORIS 911-S is a dual-sided sight flow indicator with butt weld ends, designed for horizontal installation in higher pressure lines. The eccentric connection arrangement allows for operation without residual liquid retention in the body when the indicator is mounted horizontally.

Technical Specifications

• Type: Dual-sided sight flow indicator
• Connection: Butt weld ends per DIN 3239-1
• Sizes: DN10 to DN80
• Operating Pressure: 10 to 160 bar, depending on specific construction
• Operating Temperature: 150 °C or 280 °C
• Installation: Horizontal only to avoid liquid retention
• Options: Flanged connection, observation lighting

Materials and Sealing

The body is available in carbon steel or stainless steel. Observation glasses are borosilicate per DIN 7080 or soda-lime per DIN 8902. Standard sealing is graphite, with other materials available as required by the fluid, temperature, or sealing requirements.

Application Field

The 911-S is selected for pipelines where visual flow confirmation is needed without liquid retention in the indicator body. Suitable for processes with line drainage, product change, hot liquids, auxiliary circuits, and chemical fluids compatible with construction materials.

Difference from NORIS 111-S / 112-S

Types 111-S and 112-S cover standard butt weld applications at lower pressures. The 911-S is intended for special construction up to 160 bar and uses eccentric geometry to reduce liquid retention in the body.

FAQ

Does it accept an actuator?
No. It is a passive visual observation indicator. Electrical options are limited to lighting.

What should be specified in the order?
DN/pipe diameter, operating pressure, temperature, body material, glass type, sealing, fluid, and need for flanges or lighting.