ASTM E2412 PDF
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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Since no single product is formed, standard materials are not available to generate the calibration curves needed to relate absorbance to concentration.
Link to Active This link will always route to the current Active version of the standard. The baseline for carbonyl oxidation measurement, referred to as oxidation, is taken at cm-1 and the maximum peak height between and cm-1 is determined. These lubricants are not presented at this time. For results where the value decreases with time, the limits would be the average minus the corresponding number of standard deviations.
Warning or alarm limits the point where maintenance action on a machine being monitored is recommended or required can be 2e412 through statistical analysis, history of the same or similar equipment, round robin tests or other methods in conjunction with correlation to equipment performance.
The footnotes to Table A2.
It is better to make a choice of lubricant type and use it consistently if the oil type is not known. E — 10 Standard Practice for Condition Monitoring of In-Service Lubricants by Trend Analysis Using Fourier Transform Infrared FT-IR Spectrometry1 This standard is issued under the fixed designation E; the number xstm following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
In the case where salt windows are used, when oil is introduced into the cell the fringe pattern is made much weaker because the refractive index of the salt window is relatively close to that of an oil sample. However, typical gearboxes and hydraulic systems will not contain particulate levels high enough to cause a significant baseline offset and tilt.
For soot, follow the specific recommendations in Table A2. Height to Peak closet to in range of Max.
Because the soot absorbance obtained is a measure of the amount of tilt in the spectral baseline, a correction should be applied to the data to account for the contribution of the transmission cell to the baseline tilt if the background is taken without the cell in the beam path.
Alternate source, beamsplitter and detector combinations covering this range are commercially available but have not been investigated for use in this practice. This practice is designed for monitoring in-service lubricants and can aid in the determination of general machinery health and is not designed for the analysis of lubricant composition, lubricant performance or additive package formulations. Water and glycol should not be routinely calibrated locally because of the difficulty in making and d2412 standards.
Other detectors may be suitable but should be used with caution. In this example, the data is from a population of diesel astj oils. Referenced Documents d2412 separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. It is usually only a consideration in diesel engines but could be indicative of carburetor or injector problems with other fuel systems.
In these systems, the most common parameters measured aastm water contamination and oxidative breakdown of the oil, e212 are presented in Table A1. Molecular analysis of lubricants and hydraulic fluids by FT-IR spectroscopy produces direct information on molecular species of interest, including additives, fluid breakdown products d2412 external contaminants, and thus complements wear metal and other analyses used in a condition monitoring program 13- 2.
However, glycol has other characteristic peaks that differentiate it from water around, and cm-1 as can be seen in Fig. However, the antiwear additive is reported as a negative value since in the in-service used oil difference spectrum the peak is negative due to the depletion of the additive compared to the original reference oil. Size px x x x x Absorbance values related to the thickness of sample exposed to light are reported.
Exact data acquisition parameters will vary depending on instrument manufacturer but most systems should be able to collect an absorbance spectrum adequate for most measurements asym less than one minute. This band is a fairly specific measure of over basing additive consumption and directly relates to the TBN assay for engine oils.
NOTE 2—Peak maxima may be easily r2412 using second derivative spectra. NOTE 9—Calibrated methods are based on standard linear regression models.
This d2412 base-stock breakdown II area is also monitored as a measurement of degradation of the polyol ester lubricants. In this case the maximum negative peak in astj range from to cm-1 with baseline points over the same range is used as shown in Fig. Standards are prepared locally by adding water to dry oil. In particular, liquid nitrogen cooled Mercury Cadmium Telluride MCT detectors are known to exhibit significant nonlinearities.
FTIR oil analyzing/measurement| Nitration FT-IR test| ASTM E
Calculations should be made based on the actual amount of glycol-based antifreeze added, not on the amount of the However, water levels of this magnitude will immediately condemn the lubricant. Current edition approved May 1, As with fuel, the presence of glycol can be confirmed by gas chromatography or a colorimetric test, or more commonly, corroborated using elemental analysis results for sodium and boron. Mixing, sonicating or mechanical shaking for at least 15 minutes is considered adequate.
Historical Version s – view previous versions of standard. In these systems, unlike the crankcase oils, however, interactions between water and the EP additives alter the infrared response, and thus water is measured differently than in the crankcase lubricants.
NOTE 4—Soot calculated from unsubtracted sample spectrum. This effect can be seen by looking at Fig. The point of maximum intensity will vary as the oil and conditions of its use are changed.
A thorough discussion of distribution profile analysis and alarm limit determination is beyond the scope of this practice. NOTE 5—Soot calculated from subtracted spectrum, before tilt correction.
No other asmt of measurement are included in this standard.
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The infrared data s2412 by this practice is typically used in conjunction with other testing methods. Spectral characteristics of diesel and other noted fuels have been found to vary.
NOTE 1—Calibrated methods for water and ethylene glycol are developed using standard preparations of water or ethylene glycol in appropriate used oil matrices. Nitration Testing Equipment used by us in our Laboratory.