Optical sensor for the measurement of VIS/NIR
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
- 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
- Easy maintenance saves time and costs
- 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
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
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.