Active probe EXcell 231

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Product overview
EXcell 231 is a digital NIR absorption probe for in-line monitoring of biotech, food and pharmaceutical production processes. It features a standardized 12 mm stainless steel shaft, wear-free sapphire measurement windows and an integrated digital amplifier. Output units include absorbance, turbidity and mass units (EBC / FAU / mg/l / AU / OD) or customer-specific units. The sensor is parameterizable from a PC using EXpert software and supports data logging and graphical display. Interfaces: Modbus RTU (RS485), USB and optional analogue 4...20 mA; integrated measured-value display.

Installation / Process integration
The probe installs via a PG13.5 process thread; installation dimensions match a standardized pH probe allowing use of compatible retractable housings and automatic cleaning systems. With EXtract 8XX retractable housings and EXmatic 470/471 control unit, fully automatic cleaning under process conditions is possible.

Your advantages

• Selectable units: EBC / FAU / mg/l / AU / OD or custom units
• Standardized 12 mm shaft with integrated amplifier (no separate transmitter required)
• Wear-free sapphire windows, CIP/SIP-capable and autoclavable
• LED light source for long service life and maintenance-free operation
• Data output via PC, Modbus RS485, USB or analogue 4...20 mA
• Easy parameterization with EXpert software
• Compatible with retractable housings for automated cleaning

Applications

• Highly accurate OD measurements up to 12 OD
• Fermentation process monitoring, including small-scale fermenters
• Cell growth and biomass tracking
• Filter monitoring
• Concentration measurement independent of sample color

Configuration options (available on product page)

• Measuring range: 0...6 AU / 0...6600 EBC / up to 12 OD (depending on selection)
• Shaft lengths: 120 mm / 225 mm / 325 mm / 425 mm
• Optical path lengths: 5 mm / 10 mm / 20 mm
• Process connection: Thread PG13.5
• Interfaces: Modbus RTU (RS485) or Modbus RTU (RS485) + Analogue 4...20 mA

Technical information (summary)
Measuring principle: NIR absorption at 850 nm with LED light source
Wetted parts: stainless steel 1.4435 (316L) with sapphire measuring window
Protection class: IP68
Typical cable lengths: 2 m or 5 m

Caractéristiques / spécifications techniques

• Measuring range: 0...6 AU, 0...6600 EBC
• Resolution: 0.01 AU
• Accuracy: ±1% of reading
• Reproducibility: ≤1% of final value
• Wavelength: 850 nm
• Light source: LED
• Optical path length: 5 / 10 / 20 mm
• Shaft length (mm): 120 / 225 / 325 / 425
• Wetted material: stainless steel 1.4435 (316L)
• Surface finish: Ra <0.37 µm
• Measuring window: sapphire
• Process connection: thread PG13.5
• Process temperature: 0...90 °C (135 °C max for 1 h SIP)
• 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