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Optical Sensor For Absorption Measurement

EXcell 241

EXcell 241 is a high precision digital NIR absorbance sensor for DN25-weld in sockets that monitors biomass measurement in biotech, food, and pharma applications for both lab and industrial production processes.

Last Updated: January 6, 2023

EXcell 241

NIR Biomass Sensor DN25

The EXcell 241 is a high precision digital NIR-absorbance sensor for DN25-weld in sockets that monitors biomass in biotech, food, and pharmaceutical applications. The sensor is a reliable, robust, and cost-efficient measuring device for typical industrial fermentation vessels thanks to its stainless steel construction, non-wearing sapphire windows, LED technology and integrated digital amplifier. Different measuring units, such as EBC, FAU, mg/l, AU, OD or customer-specific units, can be issued for mass, turbidity, and absorbance.

The associated EXpert software makes it simple to parameterise the sensor on a PC, and it also allows you to store, export and graphically display the measured data. There are also interfaces for Modbus RS485 and for 0-20mA current output available.

A G1 1/4″ thread connects the sensor to the weld-in socket. To ensure the most sterile installation, the O-ring position can be freely selected based on the existing socket.

Your benefits

Technical Specifications*
*Subject to change without notice
Measuring range0...6 AU, 0...6600 EBC
Resolution0,1 % or 0,01 AU
Accuracy± 1 %
Reproducibility≤ 1 % from final value
Wavelength850 nm
Light sourceLED
Optical path length5 / 10 / 20 mm
Immersion length70-85 mm / 110-125 mm
Wetted materialStainless steel 1.4435 (316L)
SurfaceRa <0.37 µm e-polished
Measuring windowSapphire
Process connectionThread G1 1/4
Process temperature0...90 °C, 135 °C max. 1 hour (SIP cycle)
Process pressureMax. 10 bar (150 psi)
Electrical connectionFischer Core Series
Cable length2 m / 5 m
InterfacesUSB, RS485 Modbus, 0...20 mA with switching output
Protection glassIP68

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