ENDRESS+HAUSER  OUSAF12-W0A0A

Optical sensor combined with the OUA260 flow assembly for absorbance measurement

The sensor is used to determine the VIS/NIR absorption of a liquid medium.

• Suspended solids measurement
  • Pharmaceuticals and biotechnology
  • Chemical industry
  • Paper and pulp industry
• Interphase detection
  • Food and beverage industry
  • Chemical industry
  • Oil and gas industry
• Centrifuge and separator control

• Quality control and enhanced production efficiency thanks to reliable absorption measurement
  • Measuring range up to 2.5 AU or 50 OD (depending on optical path length)
  • Can be configured to measure absorption at discrete wavelengths in the visible regionand NIR region
  • Color-independent measurement with optional broadband filter
  • Incandescent lamp for long service life and stable measured values
• Cost-effective, time-efficient verification (liquid-free)
• FM- and ATEX-approved lamps for applications in the hazardous area
• Deployable and durable in numerous applications: Variety of materials and process connections
• Hygienic design for high degree of product safety: certified materials and CIP/SIP resistance
• Can be adapted to process requirements: Optional air purge ports to prevent the formation of condensate on the optical windows

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.

An optical measuring system comprises:

• Sensor (photometer) OUSAF12
• Liquiline CM44P transmitter
• Cable set CUK80
• Assembly to suit the sensor, e.g. OUA260