Turbidity probe EXcell 251

concentrationinfraredfor the food industry

Product description
The NIR backscatter sensor EXcell 251 is a high-precision digital NIR probe for monitoring production processes in the biotech, food and pharmaceutical industries. Its 12 mm stainless-steel rod design and wear-free sapphire windows make the EXcell 251 a reliable backscatter sensor with an integrated digital measuring amplifier. Measured turbidity values can be output in "arb.Unit" or customer-specific units. The sensor can be configured on a PC using the EXpert software; measurement data can be logged and displayed graphically. A Modbus RS485 interface and an additional 4...20 mA interface are available.

Installation and cleaning options
The sensor is installed in the process via a PG13.5 thread. The process-side installation dimensions correspond to a standardized pH sensor, making the sensor usable with process changeover fittings and fully automated cleaning systems. In combination with EXtract 8XX changeover fittings and the EXmatic 470 controller (fully automatic), automatic cleaning under process conditions is possible, enabling reliable operation even in the most demanding applications.

Benefits

• Rod sensor design with integrated digital amplifier
• Wear-resistant sapphire window, CIP/SIP compatible
• Hygienic design, autoclaveable
• LED light source ensures long-lasting, stable signal
• Data output via PC, Modbus RS485 or 4…20 mA
• High linearity of the measurement signal
• Easy configuration with EXpert PC software
• Compatible with changeover fittings for automatic cleaning of the measurement windows

Applications

• High-precision concentration measurement up to 300 g/l
• Use in fermentation processes
• Well suited for small fermenters
• Measurement of cell growth
• Color-independent turbidity measurement

Technical characteristics / specifications

• Measuring range: 0...100 arb.Unit / 0...300 g/l (CDW yeast)
• Resolution: 0.01 arb.Unit
• Accuracy: ± 1.5 % of measured value
• Reproducibility: ≤ 1 % of full scale
• Wavelength: 850 nm
• Light source: LED
• Shaft length: 120 / 220 / 320 / 420 mm
• Material: stainless steel 1.4435 (316L)
• Surface: Ra <0.37 µm
• Measuring window: sapphire
• Process connection: thread PG13.5
• Process temperature: 0...90 °C, 135 °C max. 1 hour (SIP cycle)
• Process pressure: max. 16 bar (232 psi)
• Electrical connection: Fischer Core Series
• Connection cable length: 2 m / 5 m
• Interfaces: USB, RS485 Modbus, 4...20 mA
• Protection class: IP68