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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.
This practice is designed for monitoring in-service lubricants and can aid e212 the determination of general machinery health and is not designed for ee2412 analysis of lubricant composition, lubricant performance or additive package formulations.
Both examples are indicative of multiple sources of the same data, low ratio of normal data to failure data or poor measurement precision.
Height to Negative peak height Area to Area to Verification peak: Therefore, when glycol is present, water cannot be reliably quantified using the FT-IR measurement.
The information in the remainder of this section provides more detail about the individual parameters.
ASTM E – standard practice for Condition Monitoring of Used Lubricants by FT-IR Spectrometry.
In particular, liquid nitrogen cooled Mercury Cadmium Telluride MCT detectors are known to exhibit significant nonlinearities. Last wstm edition approved in as E— However, this is not necessary, as lubricant condition monitoring requires only reliable, repeatable measurements.
The baseline shift caused by soot is affected by the amount of soot present and the effective particle size.
Water and glycol should not be routinely calibrated locally because of the difficulty in making and analyzing standards.
While a mean and standard deviation can still be calculated, the user should verify that alarm limits based on these statistics are descriptive of the actual distribution. As previously noted, building calibration curves for measurement parameters when pure or prepared standards are available is possible. While calibration to generate physical concentration units may be possible, it is unnecessary or impractical in many cases. The infrared data generated by this practice is typically used in conjunction with other testing methods.
In addition, many aero-derivative gas turbines are used in power generation, marine transport e24122 other non-aeronautical applications. Water is measured as depicted in Fig. The magnitude of this offset is determined by the particle f2412 of the soot as well as its concentration.
Thank you for interesting in our services. A number of physical property tests complement wear metal analysis and are used to provide information on lubricant condition for example, Test Methods D, D, and D The following are provided only as an example. A wider range for the baseline points can be used to achieve better sensitivity, although this caused a reduction in the selectivity. Oxidation, nitration and asm of base stocks are monitored as evidence of degradation. Measurement and data interpretation parameters are presented to allow operators of different FT-IR spectrometers to compare results by employing the same techniques.
The abscissa represents the integrated nitration result.
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 Mixing, sonicating asym mechanical shaking for at least 15 minutes is considered adequate.
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.
Contaminants monitored include water, soot, ethylene glycol, fuels and incorrect oil. Significance and Use 5. Molecular analysis of 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 astn a condition monitoring program 13- 2.
Alternatively, if failure modes are underrepresented, ashm distribution may be narrow, and the calculated limits may be too low.
FTIR oil analyzing/measurement| Nitration FT-IR test| ASTM E
This component is monitored as a negative peak in the difference spectrum since the new oil will contain a greater concentration of the additive than the in-service oil. The breakdown II region is also highlighted in Fig. A peak area over this range is used as is depicted in Fig. This value can be significant in the case of a ZnSe cell, on the order of 0.
The measurement listed can be used as a guideline but is not intended to be the only infrared based fuel contamination measurement. Do not use plastic containers. NOTE 2—Peak maxima may be easily identified using second derivative spectra.
For example, infrared spectroscopy cannot determine aztm metal levels or any other type of elemental analysis. The atsm variety of potential contaminants suggests an equally wide e24412 of measurement methods may be desirable. Under severe conditions of lubricant degradation, this band will begin to overlap and contribute to the integrated water measurement area.
This assumes a test result for which the value increases with time. We need your help! Even machines with different sump sizes or different metallurgies should initially be analyzed separately. NOTE satm calculated from unsubtracted sample spectrum.
Nitration Testing Equipment used by us in our Laboratory.
This is not considered a problem because of the greater significance the presence of glycol has to engine operation. The information for these components is most useful in trend analysis. It is usually only a consideration in diesel engines but could be f2412 of carburetor or injector problems with other fuel systems.
The formation of nitrogen fixation products is most significant in gasoline and natural gas engines as well as some diesel systems that use exhaust gas re-circulation.