ENDRESS+HAUSER  OUSAF11-AA105A1A10A

Optical sensor for the measurement of VIS/NIR absorption

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

• Interphase detection
• Applications in the food and beverage industry
  • Milk detection in CIP solutions
  • Phase separation, e.g. milk/water
  • Product loss detection in outlet
• Measurement of solids in:
  • Primaries industry
  • Mining

• Cost savings and less product loss thanks to fast interphase detection:
  • Measuring range 0 to 3 AU (absorbance units)
  • Two path lengths available: 5 and 10 mm
  • Low-voltage incandescent lamp
• High degree of product safety owing to non-glass, robust and hygienic design:
  • Stainless steel housing and sensor head made from dirt-repellent FEP
  • FDA-compliant materials and 3-A certification
  • CIP/SIP-resistant
• Easy maintenance saves time and costs
• Flexible
  • Submersible sensor for applications in open tanks and basins
  • Insertion sensor with Triclamp or Varivent connection for hygienic applications in pipes and vessels
  • Color-independent measurement with optional NIR detector
  • Operating temperature range 0 to 90 °C (32 to 190 °F)

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.