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Omni-Cell Body The Omni-Cell body is comprised of two aluminium backing plates with a plastic insert between. Four thumbscrews are used to align and fasten these parts together. The transmission windows are sandwiched between the backing plates, sealing against a PTFE gasket on the front plate and a neoprene gasket on the back plate. The front plate is fitted with two Luer ports with PTFE stoppers.
Window Options A range of different window materials are available, with different chemical compatibilities and physical properties (such as refractive index and spectral range) to suit your requirements. Sealed Cells offer superior pathlength repeatability for quantitative measurements, whilst demountable cells are more suitable for general purpose applications, allowing the user easy cleaning and to quickly change pathlength at will. The Mull cell was originally designed for the mull technique, now little used, but remains a good option for the analysis of highly viscous liquids and pastes that cannot be loaded in a sealed cell. Note for thin window materials (ZnSe, Silica, AgBr, Si and Polythene) require an additional spacer (supplied as standard with these windows).
|Material||Transmissionrange (cm-1)||Refractive index @ 1000 cm-1||Suitable for||Usage notes|
|KBr||40000—400||1.53||IR||Soluble in water|
|NaCl||40000—600||1.49||IR||Soluble in water|
|CaF2||50000—1100||1.31||IR||Slightly soluble in nitric acid. Reacts with sulphuric acid to form hydrofluoric acid!|
|ZnSe||20000—500||2.41||IR||Not suitable for use with acids (<pH 5.0) or strong bases (>pH 9.0)|
|KRS-5||16000—250||2.37||Deep IR||Very Toxic – handle with care|
|Fused Silica (IR grade)||40000—3000||1.4||Near-IR, visible, and UV|
|Polyethylene||625—4||~1.5||Far-IR and THz|
Spacers For a Sealed cell a lead spacer is permanently sealed to the windows and is selected as part of the window. For Demountable and Mull cells the spacer can be changed at will and must be ordered separately.Compatible Standards
|Determination of fatty acid methyl ester (FAME) content in middle distillates. Infrared spectrometry method||EN 14078|
|In-Service Oil Condition Monitoring standard practice||ASTM D7418|
|Phosphate Antiwear Additives in In-Service Petroleum and Hydrocarbon Based Lubricants by Trend Analysis||ASTM D7412|
|Monitoring of Oxidation in In-Service Petroleum and Hydrocarbon Based Lubricants||ASTM D7414|
|Sulfate By-Products in In-Service Petroleum and Hydrocarbon Based Lubricants||ASTM D7415|
|Nitration in In-Service Petroleum and Hydrocarbon Based Lubricants||ASTM D7624|
|Standard Practice for Condition Monitoring of In-Service Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry||ASTM E2412|
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