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EH OUSBT66 Cell growth and biomass sensor for the measurement of Hygienic NIR absorption in fermentation and crystallization applications. 0-4 AU measurement range. LED light source. IP68.

Part# with Options:        OUSBT66-AA05A1A
Price with Options:        Please Email us your request for quote   


Optical Pathlength (OPL)
(1) Optical Pathlength (OPL) for EH OUSBT66
Diameter, Process Connection & Length
(2) Diameter, Process Connection & Length for EH OUSBT66

  Availability 8 Days  ]

NIR absorption sensor for the measurement of cell growth and biomass


The OUSAF11 sensor measures the VIS/NIR absorption of liquids.

  • Cell growth in bacterial fermentation and applications in mammalian cell cultures
  • Biomass in fermentation processes
  • Monitoring of algae concentration
  • Monitoring of crystallization processes
  • Measurement of solids in:
Your benefits
  • Increased product yield thanks to fast and reliable absorption measurement in fermentation and crystallization applications
  • Highest linearity and wide measuring range with LED lamp
  • Suitable for pharmaceutical use:
    • Stainless steel 1.4435 (AISI 316L)
    • Sealless sapphire window without gaps
  • High degree of product safety:
    • Sterilizable and autoclavable
    • CIP/SIP-resistant
  • Cost-effective, time-efficient calibration with traceable plug-on filters
  • For use in a wide range of applications:
    • Variety of optical path lengths for different cell cultures and concentrations
    • Process connection Pg 13.5 for installation in assemblies or head plates
    • Suitable for lab-scale, pilot-scale and production-scale bioreactors
    • Available in different lengths for different immersion depths
Measuring principle

The measuring principle is based on the Lambert-Beer law.

There is a linear dependency between the absorption of light and the concentration of the absorbing substance:

A = -logA m = ε . c . OPL
A ... absorption, A m ... absorption measured by detector
ε ... Extinction coefficient
c ... Concentration
OPL ... Optical path length

A light source emits radiation through the medium and the incident radiation is measured on the detector side.

The intensity of the light is determined by a photodiode and converted to a photocurrent.

The subsequent conversion to absorbance units (AU, OD) is performed in the associated transmitter.

Measuring Principle Cell growth
Application Cell growth and biomass in fermentation processes
Monitoring of algae concentration
Control of crystallization processes
Suspended solids measurement
Measurement range 0 ... 4 AU
0 ... 8 OD (depending on optical path length)
Design Hygienic design: - sterilizable and autoclaveable - sapphire windows without seals and crevices - CIP/SIP resistant
Material Sensor housing: Stainless Steel 1.4435 (316L) Windows: Sapphire O-ring: EPDM
Process temperature 0-70 C, (32 - 158 F) up to 135 C when lamp is switched off
Process pressure up to 10 bar (150 psi)
Ingres protection IP68

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EH OUSAF11 Glass-free Optical sensor for the measurement of VIS/NIR absorption, changing phases and suspended solids. G1 and NPT Process Connection. 390-1100 nm wavelenght range. 0-3 AU measurement range.



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