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Process Control Instruments, Field Devices and Industrial Automation
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.

We are an online distribution channel of genuine manufactured instruments such as

  • Flow Transmitters, Indicators, Sensors and Switches.
  • Pressure Switches, Indicators and Transmitters.
  • Level Switches, Indicators and Transmitters.
  • Temperature Elements, Switches and Transmitters.
  • Mass Flow Meters.
  • Density Meters.
  • pH/ORP Analyzers.
  • Disolved Oxygen Analyzers.
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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.

Part# with Options:        OUSAF44-B0A0
Price with Options:        Please Email us your request for quote   


(1) Wavelenght for EH OUSAF44
(2) Calibration/Validation for EH OUSAF44
Lamp Approval
(3) Lamp Approval for EH OUSAF44
(4) Assembly for EH OUSAF44

  Availability 2 Weeks  ]

Optical sensor combined with the OUA260 flow assembly for the measurement of UV absorption


The sensor measures the spectral absorption of process liquids in the ultraviolet region of the electromagnetic spectrum.

  • Measurement of protein concentrations
  • Chromatography monitoring
  • Filtration monitoring
  • Concentration measurement of organic compounds
  • Detection of aromates
Your benefits
  • Improved process control and easier quality control thanks to quick and reliable monitoring of product concentration
    • Measuring range up to 2.5 AU or 50 OD (depending on optical path length)
    • Measurement of UV absorption at discrete wavelengths between 254 nm and 365 nm
    • Outstanding filter properties for highest linearity
    • Direct concurrence with laboratory values
    • Integrated reference detector for lamp compensation
    • Gas discharge lamp for long service life and stable measured values
      • Patented Easycal system (optional)
        • Cost-effective, time-efficient calibration
        • Easy, in-line calibration which is traceable to NIST without any liquid standards
          • FM- and ATEX-approved lamps for applications in the hazardous area
          • Compliance with life sciences sector thanks to hygienic design and FDA- and USP-compliant sealing materials
          • High degree of product safety as SIP/CIP-resistant
          • High product yield thanks to low volume requirements
          • Maximum durability in all applications owing to wide range of materials and process connections
          • Can be adapted to process requirements:
            • Optional air purge ports to prevent the formation of condensate on the optical windows
            • Optional adjuster for optical path length
              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.

              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 transmission (%) or absorbance units (AU, OD) is performed in the associated transmitter.

Measuring Principle UV photometric
Application Continuous measuring of the spectral absorption in the ultraviolet region
Characteristic Sensor for installation in the pipe with separate flow assembly OUA260
Measurement range 0-2,5 AU, 0-50 OD (depending on optical pathlength)
Material Sensor housing: stainless steel 316
Process temperature 0-90 C (34-194 F) max. 130 C (266 F) for 2 hours
Process pressure up to 100 bar (depending on flow assembly OUA260)
Ex certification ATEX II 2G EEx d IIC T5 FM Cl.1, Div. 1, Group B, C, D for lamp housing
Ingres protection IP65 (NEMA4)

    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 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.




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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