Optical sensor combined with the OUA260 flow
assembly for absorbance measurement
Application
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
Your benefits
- 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
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 system
An optical measuring system comprises:
- Sensor (photometer) OUSAF12
- Liquiline CM44P transmitter
- Cable set CUK80
- Assembly to suit the sensor, e.g. OUA260