Turbidity probe EXcell 261

concentrationopticalinfrared

Product overview
EXcell 261 is a digital NIR backscatter sensor designed for continuous biomass monitoring in biotech, food and pharmaceutical fermentation processes. It mounts to DN25 weld-in sockets via a G1 1/4" thread. Construction in stainless steel 1.4435 (316L) with a wear-free sapphire measuring window and LED illumination provides a hygienic, CIP/SIP-capable sensor capable of displaying turbidity (arb. Unit), biomass (g/L, baker's yeast) or a customer-specific unit.

Parameterisation & data
Parameterisation is performed with EXpert software for convenient configuration. Measured values can be displayed graphically, logged and exported. Available interfaces include USB, RS485 Modbus and analogue 4...20 mA current output; an integrated digital amplifier is included.

Mechanical / installation
The sensor is fixed into the weld-in socket using a G1 1/4" thread. The O-ring position is selectable to match existing sockets and enable sterile installation. The sapphire window is wear-free; the design is hygienic and autoclavable.

Available versions / options

• Measuring range: 0...100 arb. Unit / 0...300 g/L (cell dry weight, baker's yeast)
• Immersion length: 70 mm or 110 mm under process connection
• O-ring position options: 25 mm, 28 mm, 29 mm, 30 mm (standard weld-in socket), 35 mm, 50 mm (only for 110 mm immersion), 55 mm (only for 110 mm immersion)
• Wetted sealing materials: EPDM (FDA/USP VI)
• Interfaces: Modbus RTU (RS485); Modbus RTU (RS485) / Analogue 4...20 mA; additionally USB available
• Electrical connection: Fischer Core Series
• Cable length options: 2 m or 5 m

Your advantages

• Designed for DN25 weld-in sockets
• Wear-free sapphire window, CIP/SIP-capable
• Hygienic design and autoclavable
• Maintenance-free LED light source
• Data output via PC, Modbus RS485 or 4...20 mA
• Integrated digital amplifier
• High linearity of measurement signal
• Easy parameterisation with EXpert software

Applications

• High-accuracy concentration measurement up to 300 g/L
• Suitable for fermentation processes
• Use in industrial fermentation vessels
• Cell growth monitoring
• Color-independent turbidity measurement

Specifications
Measuring range: 0...100 arb.Unit / 0...300 g/L; Resolution: 0.01 arb.Unit; Accuracy: ±1.5% of measured value; Reproducibility: ≤1% of final value; Wavelength: 850 nm; Light source: LED; Immersion length: 70 mm / 110 mm; Wetted material: Stainless steel 1.4435 (316L); Surface: Ra
Technical characteristics / specifications

• Model: EXcell 261 (NIR backscatter sensor for DN25 weld-in sockets)
• Measuring principle: NIR backscatter at 850 nm
• Measuring ranges: turbidity (arb.Unit) and biomass (g/L, baker's yeast)
• Accuracy / reproducibility: ±1.5% / ≤1%
• Materials in contact: Stainless steel 1.4435 (316L), sapphire window, EPDM (FDA/USP VI) sealing option
• Mounting: thread G1 1/4" into DN25 weld-in socket (selectable O-ring position)
• Operating temperature / pressure: 0...90 °C normal; SIP 135 °C for 1 h; max. pressure 16 bar
• Interfaces & outputs: USB, RS485 Modbus, analogue 4...20 mA; integrated amplifier
• Protection: IP68; CIP/SIP-capable; autoclavable
• Cable length options: 2 m or 5 m