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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Typically a warning or alert level will be used as an early indication of a potential problem, and an alarm qstm will be used as an indication of the need for immediate corrective action.
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. Contaminants monitored include water, soot, ethylene glycol, fuels and incorrect oil. Alternatively, if failure modes are underrepresented, the distribution may be narrow, and the calculated limits may be too low. Please fill this form, we will try to respond as soon as possible.
Testing Equipment used by us in our laboratory: Instead the peaks at and cm-1 are used to confirm the presence f2412 glycol. Height to Negative peak height Area to Area to Verification peak: Spectral characteristics of noted fuels have been found to vary. Size px x x x x Summary of Practice 4. The following e241 provided only as an example.
ASTM E2412 – 10
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. The breakdown II ashm is also highlighted in Fig.
While calibration to generate physical concentration units may be possible, it is unnecessary or impractical in many cases. Various additive packages, such as detergents, dispersants, antioxidants, overbase additives, etc. The most common degradation pathway in ester based lubricants is the conversion of the ester into organic acids and alcohols. However, glycol has other characteristic peaks that differentiate it from water around, and cm-1 as can be seen in Fig.
The information in the remainder of this section provides more detail about the individual parameters. This ester base-stock breakdown II area is also monitored as a measurement of degradation of the polyol ester lubricants. NOTE 5—Soot calculated from subtracted spectrum, before tilt correction. However, this is not necessary, as lubricant condition monitoring requires only reliable, repeatable measurements.
No other units of measurement are included in this standard.
Absorbance values related to the thickness of sample exposed to light are reported. In some cases, notably winter diesel fuel, the peak used for fuel residue is broader than that shown in Fig.
However, the converse is not true since glycol has other spectral features that are used for detection and quantification. Different laboratories have developed slight variations on these analyses. Historical Version s – view previous versions of standard.
Such statistical analyses are a tool used in establishing alarm limits for condition monitoring tests.
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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. Qstm the oil is exposed to severe nitration conditions, the nitration products in the oil will cause:.
Conventional methods such as gas chromatography or flash point make use of the asttm boiling range, while the infrared approach examines the aromatic content to indicate if fuel is present. The transformed single-beam spectrum then shows only minimal fringes.
Spectral characteristics of diesel and other noted fuels have been found to vary. As seen below in Fig.
If the empty cell is used to create the background spectrum, or when e4212 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. Alternatively, the water maximum can be measured relative to a two-point baseline drawn from cm-1 to cm The units used for reporting are absorbance per 0.
If the oil is exposed to severe nitration conditions, the nitration products in the oil will cause: The magnitude of this offset is determined by the particle size of the soot as well as its concentration.
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 e242 cell to the baseline tilt if the background is taken without the cell in the beam path. Since no single product is formed, standard materials are not available to generate the calibration curves needed to relate absorbance to concentration. Great care should be taken when preparing these materials to avoid fire hazard or exposure to the vapors.
Even machines with different sump sizes or different metallurgies should initially be analyzed separately. The objective of this monitoring activity is to diagnose the operational condition of the machine based on fault conditions observed in the oil.
In this example, the data is from a population of diesel engine oils. Level Zero and Level One Tests. Fringe reduction techniques can be used to avoid this problem.