placed in context of the recently approved ASTM Practice E alternative means of executing this ASTM Practice, its objective being to minimize . E – Download as PDF File .pdf), Text File .txt) or read online. Referenced Documents ASTM Standards:3 D Test Method for Kinematic Viscosity. improper air/fuel ratio. There are test methods for laboratory grade FTIR measurement as well as for portable field testing. ASTM E describes the standard.
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The information for these components is most useful in trend analysis. Sequential samples over the course of the overhaul period are more likely to yield normally distributed results.
Fringe reduction techniques can be used to avoid this problem. The practice as presented is not intended for the prediction of lubricant physical properties for example, viscosity, total base number, total acid number, etc. E241 normal blow-by, when nitrogen oxide products enter the lubricant, the react with the moisture and become acidic in nature and rapidly accelerate the oxidation rate of the oil.
ASTM E – standard practice for Condition Monitoring of Used Lubricants by FT-IR Spectrometry.
If the empty cell is used to create the background spectrum, or when a ZnSe cell with exactly parallel windows is used to collect the sample spectrum, these fringes will appear to be in the absorbance spectrum of the oil.
Oxidation, nitration and sulfonation of base stocks are monitored as evidence of degradation. This includes varnish or lacquer in hot areas of the engine, and sludge in cooler areas of the engine which may lead to ring sticking and filter plugging, respectively Increase in blow-by which will lead to top-end wear.
In particular, liquid nitrogen cooled Mercury Cadmium Telluride MCT detectors are known to exhibit significant nonlinearities. Contaminants monitored include water, soot, ethylene glycol, fuels and incorrect oil. Water and glycol should not be routinely calibrated locally because of the difficulty in making and analyzing standards.
This component is monitored as a awtm peak in the difference spectrum since the new oil will contain a greater concentration of the additive than the in-service oil.
NOTE 8—Phosphate antiwear is a negative peak height since it represents additive depletion compared to ashm new oil.
Great care should be taken when preparing these materials to avoid fire hazard or exposure to the vapors. Consistent analyses should be applied for each application.
NOTE 2—Peak maxima may be easily identified using second derivative spectra. Historical Version s – view previous versions of standard.
ASTM E2412 – 10
Spectral characteristics of glycol axtm are shown in Fig. Min to Min to Min to As noted in 9. The infrared data generated by this practice is typically used in conjunction with other testing methods. Increase in viscosity due to thickning of the oil Increase in the acidity of the oil resulting in increase in Acid Number AN Increase in insolubles. Height to Min.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. In 6 E — 10 increases as 2e412 lubricant breaks down. Size px x x x x In this example, the data is from a population e2421 diesel engine oils. Fuel has a lower boiling range and a higher percentage of aromatic material. This ester base-stock breakdown II area is also monitored as a measurement of degradation of the polyol ester lubricants.
As data becomes available, other lubricant types can be added to the annex. Condition alerts and alarms can then be triggered according to asym the level and the trends from the monitored system. Spectral characteristics of diesel Figs.
Since there are no other spectral features in the region at cm-1, this area is used to assess the level of soot in a sample as is shown in Fig. NOTE 12—Glycol verification peak locations can best be derived adtm the second derivative spectrum.
Therefore, when glycol is present, water cannot be reliably quantified using the FT-IR measurement.
While this is not as sensitive as some other techniques, it is at a level where problems from the presence of water in the crankcase could begin.