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Optical sensor for absorption measurement

EXcell 231

EXcell 231 is a high precision digital NIR-absorbance sensor with a 12mm hygienic design that monitors biomass measurement in biotech, food, and pharma applications for both lab and industrial production processes.

Last updated: January 6, 2023

EXcell 231

NIR Biomass Sensor Ø12mm

The EXcell 231 is a high precision digital NIR-absorbance sensor for monitoring production processes in the biotech, food, and pharmaceutical industries. The sensor is intelligent and reliable thanks to its 12mm stainless steel construction and non-wearing sapphire windows. 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 record and graphically display the measured data. There are also interfaces for Modbus RS485 and a 0-20mA output with an integrated display for the measured value available.

Through a PG13.5 thread, the sensor is attached to the process. The mounting dimensions on the process side fit a common pH sensor. As a result, the sensor can be used in conjunction with fully automatic cleaning systems and probe housings.

Automatic cleaning under process conditions is also possible with the proven retractable probe housings of the EXtract 8XX series and the associated EXmatic 470 control unit (fully automatic), providing reliable use even in the most difficult applications.

Your benefits

Technical Specifications*
*Subject to change without notice
Measuring range0...6 AU, 0...6600 EBC
Resolution0,01 AU
Accuracy± 1 %
Reproducibility≤ 1 % from final value
Wavelength850 nm
Light sourceLED
Optical path length5 / 10 / 20 mm
Shaft length120 / 225 / 325 / 425 mm
Wetted materialStainless steel 1.4435 (316L)
SurfaceRa <0.37 µm e-polished
Measuring windowSapphire
Process connectionThread PG13,5
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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