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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Here, the integrated area for the spectrum representing atm 0. The wide variety of potential contaminants suggests an equally wide variety of measurement methods may be desirable. NOTE 4—Soot calculated from unsubtracted sample spectrum.
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. The measurement listed can be used as a guideline but is not s2412 to be the only infrared based fuel contamination measurement.
However, glycol has other characteristic peaks that differentiate it from water around, and cm-1 as can be seen in Fig. The testing of Nitration is done in our laboratory by atsm FTIR Fourier transform infrared spectrometer, which can be coupled with Acid Number Test and Viscosity to determine the extent of nitration and degradation of the oil.
Please copy and paste this embed s2412 to where you want to embed Embed Script. The histogram should have roughly a bell-shaped appearance and be free of multimodal features. A common method is to locate the secondary phase-delayed centerburst in the interferrogram recorded for the empty cell and remove it by computer manipulation.
ASTM E – standard practice for Condition Monitoring of Used Lubricants by FT-IR Spectrometry.
Work Item s – proposed revisions of this standard. Nitration Testing Equipment used by us in our Laboratory. For example, infrared spectroscopy cannot determine wear metal levels or any other type of elemental analysis.
A peak area over this range is used as is depicted in Fig.
The practice as presented is not intended for the prediction of lubricant physical properties for example, viscosity, total base number, total acid number, etc. Fuel has a lower boiling range and a higher percentage of aromatic material. The measurement 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 NOTE 12—Glycol verification peak locations can best be derived from the second derivative spectrum.
The baseline asfm carbonyl oxidation measurement, referred to as oxidation, is taken at cm-1 and the maximum peak height between and cm-1 is determined.
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 in less than one minute.
However, typical gearboxes and hydraulic systems will not contain particulate levels high enough to cause a significant baseline offset and tilt. Verify that the frequency distribution is approximately normally distributed. Alternate source, beamsplitter and detector combinations covering this range are commercially available but have not been investigated for use in this practice.
While this is not as sensitive as some other techniques, it is at a level where problems from the presence of these contaminants in the crankcase could begin.
The magnitude of this offset is determined by the particle size of the soot as well as its concentration.
Excessive water levels may cause the lubricant breakdown reading to be higher than the actual level. 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. Note that while Fig.
FTIR oil analyzing/measurement| Nitration FT-IR test| ASTM E
The effective particle size is determined by the nature of the combustion system and the dispersants in the oil. Standards are prepared locally by adding water to dry oil.
A number of physical property tests complement wear metal analysis asgm are used to provide information on lubricant condition for example, Test Methods DDand D However, this is not necessary, as lubricant condition monitoring requires only reliable, repeatable measurements.
If the initial analyses yield similar limits for all test parameters, it may be appropriate to pool results. In addition, multiple frequency distributions may also be required and are not given here. 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.
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. Height to Negative peak height Area to Area to Verification peak: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.