OID Optical Interface Detector


OID™ FT Flow Through model

The KAM OID™ Optical Interface Detector has been the preferred sensor for interface detection between refined products since its inception in 2000. Like eyes in the pipe, it provides accurate, real-time data on product interface even when density does not change between products such as with multiple grades of diesel, allowing operators to make cuts with confidence and significantly reduce product downgrade and/or transmix.

Fiber optics within the optical probe respond to the absorption, fluorescence, and refractive properties of the fluid, and the combined return signal is then turned into an “optical signature,” recognizing qualitative changes in pipeline fluids.

The OID™ is designed for minimal maintenance and ongoing ease of use. Long-lasting LED light sources ensure long-term, stable performance and minimal power consumption. All electronics are located in an explosion-proof enclosure directly on the end of the probe for  a complete and compact unit with maximum installation flexibility.

Measurement is completely automatic and the output signal can be sent to the SCADA, PLC’s, or to a Central Control Room.

CLICK HERE for a white paper on Interface Detection in Liquid Pipelines.

CLICK HERE for an article published by the Oil & Gas Journal showing testing results of an OID.



  • The optical probe utilizes optimal wavelength for interface detection
  • Measures the absorption, fluorescence, and refractive properties of the fluid
  • Combined fluid properties are output as an analog signal or “optical signature” unique to each product
  • Output signal can be sent to the SCADA, PLC’s, or to a Central Control Room
  • Measurement is fully automatic


  • Detects the interface of specialty fuels such as ULSD (Ultra-Low Sulfur Diesel)
  • Lenses do not require cleaning
  • Electronics are housed directly on the atmospheric end of the probe
  • No moving parts
  • Insertable model installs without having to drain the pipe
  • Uses LED’s for long-term performance with minimal power and maintenance requirements


  • Batching
  • Interface detection
  • Product transmix management
  • Product downgrade management
  • Pipeline automation
  • Chemicals interface
  • Clear oil interface
  • Quality control


Media: Refined products
Material: Wetted parts–316 stainless steel*
Electronics enclosure–Copper-free aluminum
Power: 12–24 VDC 2 Watts max
Output: 4-20 mA, RS485, RS232
Fluid temperature: -40ºF to 176ºF (-40ºC to 80ºC)
Ambient temperature: -4ºF to 140ºF (-20ºC to 60ºC)
Pressure ratings: ANSI 150, 300, 600, 900
Mounting: 3/4″ and 1″ MNPT
2″ MNPT Seal Housing*
2″, 3″, or 4″ Flanged Seal Housing
Hazardous Area: PTB 04 ATEX 1027
Ex II 2 G Ex db IIB T6 Gb
IECEx PTB 21.0012
Ex db IIB T6 Gb
EX enclosure: 4.6″ x 7.1″ x 4.4″ (117mm x 180mm x 112mm)
Shaft length: 12″ to 60″ (610 mm to 1524 mm)
Off-the-shelf lengths are 24″, 30″, 36″, 48″, and 60″ (610 mm, 762 mm, 914.4 mm, 1219 mm, and 1524 mm)
Pipe size: 3/4″ to 48″
Weight: from 10 lbs. (4.5kg)

* Seal Housing for 2″ MNPT Models are Carbon Steel.



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KAM OID Application Data Sheet

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Additional Details

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