NIR absorbance sensor EXcell 241

Product overview
EXcell 241 is a high‑precision digital NIR absorption sensor for DN25 weld‑in sockets, designed for biomass monitoring in biotech, food and pharmaceutical fermentation processes. Stainless steel wetted parts, DN25 weld‑in interface, wear‑free sapphire measuring windows, LED light source and integrated digital amplifier support measurements in absorbance, turbidity and mass units (AU / OD / FAU / EBC / mg/l) or customer‑defined units.

Parameterization and interfaces
The EXpert parameterization software enables PC‑based configuration, graphical display, logging and export of measured data. Communication and outputs include USB, RS485 Modbus and 0…20 mA (or 4…20 mA) current output.

Mechanical / Installation
The sensor is mounted to the weld‑in socket via a G1 1/4" thread; the O‑ring position can be selected to suit the existing socket for optimal sterile installation. Materials and surface finish meet hygienic requirements and the sensor is CIP/SIP capable; selected configurations allow autoclaving.

Your advantages

• EBC / FAU / mg/l / AU / OD or customer‑defined units
• Designed for DN25 weld‑in sockets
• Integrated digital amplifier—no separate transmitter required
• Wear‑free sapphire windows, CIP/SIP capable
• Hygienic stainless steel design, autoclave capable
• Maintenance‑free LED light source
• PC connection via USB, Modbus RS485 or 0…20 mA
• Easy parameterization with EXpert software

Applications

• High‑accuracy OD measurements up to 12 OD
• Fermentation process monitoring
• Use in industrial fermentation vessels
• Cell growth measurement
• Filter monitoring
• Color‑independent concentration measurement

Technical table (key data)
Measuring range: 0...6 AU, 0...6600 EBC
Resolution: 0.1 % or 0.01 AU
Accuracy: ± 1 % of measured value
Reproducibility: ≤ 1 % of final value
Wavelength: 850 nm
Light source: LED
Optical path length: 5 / 10 / 20 mm
Immersion length: 70–85 mm / 110–125 mm
Wetted material: stainless steel 1.4435 (316L)
Surface: Ra <0.37 µm
Measuring window: sapphire
Process connection: thread G1 1/4"
Process temperature: 0...90 °C, 135 °C max. 1 hour (SIP cycle)
Process pressure: max. 16 bar (232 psi)
Electrical connection: Fischer Core Series
Cable length: 2 m / 5 m
Interfaces: USB, RS485 Modbus, 4...20 mA
Protection class: IP68

Characteristics / technical specifications

• Measuring range: 0...6 AU, 0...6600 EBC
• Resolution: 0.1 % or 0.01 AU
• Accuracy: ± 1 % of measured value
• Reproducibility: ≤ 1 % of final value
• Wavelength: 850 nm
• Light source: LED
• Optical path length: 5 / 10 / 20 mm
• Immersion length: 70–85 mm or 110–125 mm
• Wetted material: stainless steel 1.4435 (316L)
• Surface: Ra <0.37 µm
• Measuring window: sapphire
• Process connection: thread G1 1/4"
• Process temperature: 0...90 °C, 135 °C max. 1 hour (SIP cycle)
• Process pressure: max. 16 bar (232 psi)
• Electrical connection: Fischer Core Series
• Cable length: 2 m / 5 m
• Interfaces: USB, RS485 Modbus, 4...20 mA
• Protection class: IP68