Parker Hannifin Manufacturing (uk) Ltd.

Anthony Peter Foord

Stuart Lucas Lunt

A sample testing apparatus is disclosed for use in optical transmission analysis of fluid samples such as oils or engine oils. The apparatus comprises a transmission cell comprising first and second fixed walls () and a movable window () that is moved with respect to the first and second walls in and out of a test region (). When the movable window () is moved into the test region () an optical path through a fluid sample in the cell is defined, the optical path through the sample comprising a portion extending through the or each gap (L,L) between a one of the first and second fixed walls () and the at least a portion of the first movable window (). Also disclosed are methods of using the sample testing apparatus and methods of performing a measurement for use in optical transmission analysis of a fluid sample.

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Worthing, United Kingdom

Anthony Peter Foord