EXcell 241

NIR Biomass Sensor DN25

EXcell 241 is a high precision digital NIR-absorbance sensor for DN25-weld in sockets monitoring biomass measurement in biotech, food and pharma applications. It´s design made of stainless steel, it´s standard DN25 weld-in socket and wearless sapphire windows, it´s LED technology and the integrated digital amplifier makes them a reliable, robust, cost efficient and unique measuring device for typical industrial fermentation vessels.Different measuring units for absorbance, turbidity and mass like AU / OD / FAU / EBC or mg/l can be displayed or even a customer defined measuring unit can be chosen.

The parametrizing software EXpert allows a comfortable and easy sensor parametrization. Also measuring values can be displayed graphically and can be stored and exported. There are different communication interfaces for USB, RS485 Modbus or for 0...20mA current output available.

The sensor is attached to the weld-in socket via a G1 1/4" thread.The O-ring position can be freely selected according to the existing socket to allow the best possible sterile installation.


Your advantages

  • EBC / FAU / mg/l / AU / OD or customer defined units
  • Design for DN 25 weld-in sockets
  • With integrated amplifier
  • No traditional transmitter necessary
  • Wearless sapphire windows, CIP/SIP-capable
  • Hygienic design, autoclavable
  • Maintenance free due to LED light source
  • PC-connection via USB, Modbus RS485 or 0…20 mA current output interfaces
  • Easy parametrization via EXpert software


Request quote


Measuring range: 0...6 AU, 0...6600 EBC
Resolution: 0,1 % or 0,01 AU
Accuracy: ± 1 %
Reproducibility: ≤ 1 % from final value
Wave length: 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 (232psi)
Electrical coonection: Fischer Core Series
Cable length: 2 m / 5 m
Interfaces: USB, RS485 Modbus, 4...20 mA
Protection class: IP68



  • High accurate OD measurements up to 12 OD
  • Suitable for fermentation processes
  • Usable in industrial fermentation vessels
  • Cell growth measurement
  • Filter observation
  • Color independent concentration measurement

Our Optical Sensors

Sensors for absorption measurement
EXcell 231EXcell 241
Sensors for absorption measurement in compact design
EXplore 131EXspect 231
Sensors for backscatter measurement in compact design
EXplore 171EXspect 271
Sensors for tubidity measurement
EXpure 191
Sensors - accessories
EXcap 110EXcap 120