The BFS-Module (Bypass Flow Switch Module) is engineered by Bühler Technologies GmbH – a premier German manufacturer globally recognized for advanced sample gas conditioning and gas analysis systems. The device is specifically designed for continuous monitoring and alarm signaling of sample gas flow rates (particularly bypass streams or main sample lines) entering gas analyzers within Continuous Emission Monitoring Systems (CEMS) and industrial process automation setups.

In industrial gas analysis, maintaining a constant and adequate sample flow rate is essential for achieving fast system response times (Response Time T90) and ensuring measurement accuracy across analytical sensors. The Bühler BFS-Module operates on the variable area float principle with magnetic coupling. As sample gas flows upward through the calibrated glass tube, the float rises proportionally to the flow rate. The position of the float is monitored by an integrated magnetic contact (Reed switch or Inductive sensor), providing immediate alarm tripping in the event of flow drop or line blockage.

Key technical features of the Bühler Technologies BFS-Module:
- Standardized Modular Design: Effortlessly integrates into pre-assembled sample conditioning panels (SCS/PCS Series) or mounts independently on CEMS analyzer cabinet plates.
- Superior Corrosion Resistance: All wetted components are crafted from premium chemically inert materials such as PVDF, Borosilicate Glass, PTFE, Viton, and 316L Stainless Steel, ensuring full resistance against aggressive acid gases (SO2, NOx, HCl).
- Integrated Safety Alarm Signal: Features a potential-free relay contact (SPDT / NO / NC) to transmit fault signals directly to PLC controllers or central alarm systems, triggering automated shutdown routines upon flow loss.
- Direct Visual Indication: The high-visibility graduated glass scale enables operators to observe actual flow rates easily and adjust the needle valve with precision during routine maintenance.

Offering exceptional durability and 24/7 operational reliability under severe plant conditions, the Bühler BFS-Module is an indispensable safety component in CEMS stations for power generation, cement manufacturing, metallurgy, chemical processing, petrochemical refineries, and analytical testing laboratories.

• Manufacturer: Bühler Technologies GmbH
• Product Line / Model: BFS-Module Series
• Device Type: Bypass Flow Switch Module / Sample Gas Flow Switch
• Country of Origin: Germany
• Operating Principle: Variable area float with magnetic contact coupling
• Flow Measuring Ranges: 10 - 100 l/h, 25 - 250 l/h, or 50 - 500 l/h (Measuring tube dependent)
• Alarm Switching Element: Magnetic Reed contact (NO / NC / SPDT) or Inductive proximity sensor
• Switching Point Adjustment: Fully adjustable Min/Max alarm threshold along the measuring scale
• Wetted Materials: Borosilicate Glass, PVDF, PTFE, Viton (FKM), 316L Stainless Steel
• Max. Operating Pressure: Up to 4 bar - 10 bar (Model dependent)
• Ambient Operating Temperature: -20°C to +80°C
• Max. Inlet Gas Temperature: Up to +80°C (High-temperature options up to +120°C)
• Contact Rating: Max. 250V AC/DC, 0.5A, 10W/VA
• Electrical Connector: Standard Plug Connector DIN EN 175301-803 or molded cable
• Gas Connection Ports: G1/4" or NPT 1/4" female thread (PVDF/SS compression fittings)
• Enclosure Protection Rating: IP65 (Dust and splash-water resistant)