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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NOTE 7—Alternate method for nitration has been suggested to eliminate metal soap contribution using peak at with baseline minima in range to and to Both examples are indicative of multiple sources of the same data, low ratio of normal data to failure data or poor measurement precision. The following are provided only as an example. No other units of measurement are included in this standard. Thus, the fringe pattern essentially disappears from the spectrum. 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.
Warning or alarm limits the point where maintenance action on a machine being monitored is recommended or required can be determined through statistical analysis, history of the same or similar equipment, round robin tests or other methods in conjunction with correlation to equipment performance. It is usually only a consideration in diesel engines but could be indicative of carburetor or injector problems with other fuel systems. Please copy and paste this embed script to where you want to embed Embed Script.
The magnitude of this offset is determined by the particle size of the soot as well as its concentration.
Height to Min. For results where the value decreases with time, the limits would be the average minus the corresponding f2412 of standard deviations. Size px x x x x For this reason, the measurement area developed for monitoring levels and trends of ZDDP has been found to be equally useful for monitoring tricresyl phosphate TCP. Certain of the components are not calibrated, including oxidation, nitration, sulfation, soot, and phosphate antiwear additive.
ASTM E2412 – 10
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 immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Molecular analysis qstm lubricants and hydraulic fluids by FT-IR spectroscopy produces direct information on molecular species of interest, including additives, fluid breakdown products and external contaminants, and thus complements wear metal and other analyses used in a condition monitoring program 1, Please help us to share our service with your friends. Excessive water levels may cause the lubricant breakdown reading to be higher than the actual level.
Standards are prepared locally by adding water to dry oil. Contaminants monitored include water, soot, atsm glycol, fuels and incorrect oil. The calibrations prepared for diesel fuel and gasoline may not accurately reflect the fuels in use in particular regions of the world.
This fact makes it difficult to directly assess or calibrate the quantity of soot, so factors that relate the amount of soot to the infrared absorbance value must be established with the engines and lubricants of interest. While calibration to generate physical concentration units may be possible, it is unnecessary or impractical in many cases.
Spectral characteristics of diesel Figs. Alternatively, the water maximum can be measured relative to a two-point baseline drawn from cm-1 to cm This feature is shown in Fig. In most cases, identifying the presence of a foreign fluid is all that is required to generate an appropriate maintenance response. Beyond this point the behavior of water in petroleum lubricants becomes very nonlinear when measured in lubricating oil by an optical measurement technique such as infrared.
The broadness of the peak is a result of the wide variety of materials present.
In addition, multiple frequency distributions may also be required and are not given here. The footnotes to Table A2. NOTE 4—Soot calculated from unsubtracted sample spectrum.
FTIR oil analyzing/measurement| Nitration FT-IR test| ASTM E
Alternatively, some labs measure the absorbance of the peak closest to cm-1 relative to a single-point baseline at cm In the case where ZnSe windows are used, when the oil is introduced into the cell a significant fringe pattern is typically still observed because the refractive index of the ZnSe is much greater than that of an oil sample. Once again however, water levels of this magnitude will condemn the lubricant irrespective of the actual breakdown level. The particle size observed is affected by the engine type and lubricant.
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. Oxidation, nitration and sulfonation of base stocks are monitored as evidence of degradation.
Calculations should be made based on the actual amount of glycol-based antifreeze added, not on the amount of the In addition, many aero-derivative gas turbines are used in power generation, marine transport and other non-aeronautical applications. In particular, liquid nitrogen cooled Mercury Cadmium Telluride MCT detectors are known to exhibit significant nonlinearities.
This approach will generate incorrect results, particularly for antifreeze, fuel and water. A peak area over this range is used as is depicted in Fig. Condition alerts and alarms can then be triggered according to both the level and the trends from the monitored system.
The infrared data generated by this practice is typically used in conjunction with other testing methods. If the oil is exposed to severe nitration conditions, the nitration products in the oil will cause:. This value can be significant in the case of a ZnSe cell, on the order of 0.
The e242 of the nitrogen oxide feature is done by choosing the maximum peak intensity over the range of to cm-1 with a single-point baseline at cm-1 or cm We are a non-profit group that run this website to share documents.