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The OUSAF11 optical absorption sensor from Endress and Hauser uses visible and near-infrared wavelengths of light to measure optical absorbance by a process fluid. It is suitable for applications such as product loss detection, interface detection and suspended solids and turbidity measurements.

The sensor, which is available in an immersion model for use in open tanks and basins and an insertion module with Tri-Clamp or Varivent connections that meet 3A sanitary standards, can be operated continuously at up to 90ºC and up to 130ºC for two hours.

The device can be installed in a pipe, with the appropriate fitting, or suspended in an open channel or basin.

The OUSAF11’s body is constructed of 316L stainless steel and the measuring head — containing the light source and optical sensor — is made of FEP fluorocarbon film. This film is non-reactive, highly transparent and resistant to sunlight and has a high temperature rating.

The sensor, which can be used in hot clean-in-place processes, operates with the Memograph CVM40 graphic transmitter and recorder to form a complete measurement system. The CVM40 can be field or panel mounted and programmed with math functions and linearisation capability to output in a preferred unit of measure.

Key features

  • Fouling-resistant sensor head containing no glass
  • Full-colour graphic display
  • Built-in web server
  • Profibus, Modbus, Ethernet TCP/IP and RS232C/RS485 communications
  • Four optical channels for input from sensors
  • Two universal analogue inputs that accept voltage, current, RTDs, thermocouples and other standard inputs


Endress+Hauser is a global leader in measurement instrumentation, services and solutions for industrial process engineering. With over 8,000 employees worldwide, the Group generates annual net sales of more than Euro1.1 billion.

The Endress+Hauser Group

Endress+Hauser is a global leader in measurement instrumentation, services and solutions for industrial process engineering. The Group employs 13,000 personnel across the globe, generating net sales of more than 2.1 billion euros in 2015.
With dedicated sales centres and a strong network of partners, Endress+Hauser guarantees competent worldwide support. Production centers in 11 countries meet customers’ needs and requirements quickly and effectively. The Group is managed and coordinated by a holding company in Reinach, Switzerland, with UK headquarters in Manchester. As a successful family-owned business, Endress+Hauser is set for continued independence and self-reliance.
Endress+Hauser provides sensors, instruments, systems and services for level, flow, pressure and temperature measurement as well as analytics and data acquisition. The company supports customers with automation engineering, logistics and IT services and solutions. Our products set standards in quality and technology.
We work closely with the chemical, petrochemical, food & beverage, oil & gas, water & wastewater, power & energy, life science, primaries & metal, renewable energies, pulp & paper and shipbuilding industries. Endress+Hauser supports its customers in optimising their processes in terms of reliability, safety, economic efficiency and environmental impact.
Founded in 1953 by Georg H Endress and Ludwig Hauser, Endress+Hauser has been solely owned by the Endress family since 1975. The Group has developed from a specialist in level measurement to a provider of complete solutions for industrial measuring technology and automation, with constant expansion into new territories and markets.

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