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PRODUCTS & SERVICES is a provider of process control instruments and field devices for Oil & Gas, Industrial Machinery, Pipelines, Custody Transfer, Tank Gauging, Waste Processing, Water Treatment Plants, Burner Management Systems and Incinerators, Conveyor Control, Food & Beverage, Motor, Pump & Compressor Control, Wireless Telemetry, Data Logging, Real-Time Process Data to Web.

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EH OUSAF22 Optical sensor combined with OUA260 flow assembly for the measurement of color concentrations in liquids. 390-1100 nm wavelenght range. 0-2,5 AU measurement range. Embedded validation filter. FM and ATEX approvals.

Part# with Options:        OUSAF22-B0C0A
Price with Options:        Please Email us your request for quote   


Wavelengths combination
(1) Wavelengths combination for EH OUSAF22
(2) Lamp for EH OUSAF2X
Lamp Approval
(3) Lamp Approval for EH OUSAF22
(4) Assembly for EH OUSAF22

  Availability 2 Weeks  ]

Optical sensor combined with the OUA260 flow assembly for the measurement of color concentrations


The sensor is used to measure color concentrations in the range of the visible electromagnetic spectrum.

  • Color scale measurement: APHA/Hazen, EBC, ASBC, ASTM, ICUMSA
  • Measurement of color concentration
    • Outgoing goods inspection/purity monitoring
    • Color assurance
    • Discoloration control
    • Distillation monitoring
Your benefits
  • As slightest color changes are detected, production quality is guaranteed
    • Measuring range up to 2.5 AU or 50 OD (depending on optical path length)
    • Can be configured to measure color concentration at discrete wavelengths in the visible regionregion
    • Outstanding filter properties for highest linearity
    • Direct concurrence with laboratory values
    • Integrated reference detector for the compensation of particles, bubbles and lamp aging
    • 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.

A beam splitter splits the light into two beams. One beam is used for measuring while the other acts as a reference to compensate for particles, bubbles and lamp aging.

Once the light has passed through a filter for wavelength selection, 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 Optical sensor
Application Color measurement (APHA/Hazen, EBC, ASBC, ASTM, ICUMSA,...)
Measurement range 0-2,5 AU
Material Sensor housing: Stainless Steel 316L
Process temperature 0 to 90 C (32 to 194 F) continuous max. 130 C (266 F) for 2 hours
Process pressure 0-100 bar (depending on flow through assembly)
Ex certification ATEX II 2G EEx d IIC T5 FM Cl.1, Div. 1, Group B, C, D
Ingres protection IP65 (NEMA 4)

    OUA260-BA1B04D1A1A EH OUA260 flow assembly for absorption, color and turbidity measurements with OUSAFXX and OUSTF10 optical sensors. Ultra-hygienic design...

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EH OUSAF44 Optical sensor combined with OUA260 flow assembly for the measurement of UV absortion. 254-365 nm wavelenght range. 0-2,5 AU measurement range. CIP, SIP, FM and ATEX approvals. IP65.




EH OUSAF21 Optical sensor for the measurement of low color concentrations in water. 390-1100 nm wavelength range. Embedded validation filter. Female NPT Process Connection. 0,75" nominal diameter. FM and ATEX approvals.



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