Pearl Accessory


Fast liquid FTIR transmission accessory.

This accessory greatly reduces the time and difficulty of liquid sample analysis.

The Pearl™ is a high specification liquid transmission accessory designed for laboratory spectroscopic sample analysis in the Near and Mid-Infrared. The accessory contains an innovative Oyster Cell assembly which holds your sample in a horizontal plane.

The design of the Pearl™ and Oyster Cell allows for fast and easy application of the sample, and for cleaning between samples.


  • Easiest liquid FTIR sampling system available
  • Faster and more reliable than traditional liquid cells, saving time and money
  • Very accurate and repeatable pathlengths, including the option of wedging to eliminate troublesome fringing
  • Various pathlengths and window materials, which can be changed in seconds
  • Handles viscous materials with ease

Analyse volatile liquids using transmission spectroscopy

For more volatile samples, there is an injection access port in the top Oyster, so the cell assembly does not have to be fully opened. At all times, the sample can be viewed through the two windows, allowing the user to ensure that no bubbles have been trapped.

The Oyster Cell can be cleaned very easily and quickly using tissue and an appropriate solvent.

Accurate transmission pathlength

The Pearl™ has been designed to provide a more accurate pathlength than can be achieved when using a traditional liquid transmission accessory, with pathlengths repeatable to significantly less than 1μm thanks to the innovative Oyster Cell.

The Oyster Cells have the unique feature of being offered as either parallel or wedged cells to eliminate troublesome fringing patterns.

Interchangeable FTIR transmission windows

Pearl™ can be fitted with ZnSe or CaF2 windows which can be interchanged in seconds. These Oyster Cells are available in six pathlengths, 25μm 50μm, 100μm, 200μm, 500μm and 1,000μm.


Compatable with measurement standards

Determination of fatty acid methyl ester (FAME) content in middle distillates. Infrared spectrometry methodEN 14078
In-Service Oil Condition Monitoring standard practiceASTM D7418
Phosphate Antiwear Additives in In-Service Petroleum and Hydrocarbon Based Lubricants by Trend AnalysisASTM D7412
Monitoring of Oxidation in In-Service Petroleum and Hydrocarbon Based LubricantsASTM D7414
Sulfate By-Products in In-Service Petroleum and Hydrocarbon Based LubricantsASTM D7415
Nitration in In-Service Petroleum and Hydrocarbon Based LubricantsASTM D7624
Standard Practice for Condition Monitoring of In-Service Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) SpectrometryASTM E2412


Contact us

If you have any questions or require further information, please do not hesitate to email us at [email protected], call us on +44 (0)113 286 4536 or submit a contact form.