Image analyzer
A sophisticated microscopic system involving a microscope, a television camera, a dedicated computer, and a viewing monitor similar to a television screen.

Immiscible
Incapable of being mixed without separation of phases. Water and petroleum oil are immiscible under most conditions, although they can be made miscible with the addition of an emulsifier.

In-line filter
A filter assembly in which the inlet, outlet and filter element axes are in a straight line.

Indicator
A device which provides external evidence of sensed phenomena.

Indicator, pressure
An indicator that signals pressure conditions.

Indicator, differential pressure
An indicator which signals the difference in pressure between two points, typically between the upstream and downstream sides of a filter element.

Influent
The fluid entering a component.

Infrared spectroscopy
An analytical method using infrared absorption for assessing the properties of used oil and certain contaminants suspended therein. See FTIR.

Infrared spectra
A graph of infrared energy absorbed at various frequencies in the additive region of the infrared spectrum. The current sample, the reference oil and the previous samples are usually compared.

Ingested contaminants
Environmental contaminant that ingresses due to the action of the system or machine.

Ingression level
Particles added per unit of circulating fluid volume.

Inhibitor
Any substance that slows or prevents such chemical reactions as corrosion or oxidation.

Initial Boiling Point
According to ASTM Method D86, the recorded temperature when the first drop of liquid falls from the end of the condenser.

Insolubles
Particles of carbon or agglomerates of carbon and other material. Indicates deposition or dispersant drop-out in an engine. Not serious in a compressor or gearbox unless there has been a rapid increase in these particles.

Intensifier
A device which converts low pressure fluid power into higher pressure fluid power.

Ink Oil
Any of the petroleum oils used as carriers for the pigment used in making printing inks.

Insulating Oil
An oil used in circuit breakers, switches, transformers, and other electrical apparatus for insulating, and/or cooling. In general, such oils are well-refined petroleum distillates of low volatility, with high resistance to oxidation and sludging.
 
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