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. Fuel has a lower boiling range and a higher percentage of aromatic material. 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. Instead the peaks at and cm-1 are used to confirm the presence of glycol.
The abscissa represents the integrated nitration result. 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.
ASTM E – standard practice for Condition Monitoring of Used Lubricants by FT-IR Spectrometry.
Please help us to share our service with your friends. NOTE 11—Ethylene glycol calibrations based on Min to Min to Min to As noted in 9.
These warning or alarm limits can be a fixed maximum or minimum value for comparison to a single measurement or can also be based on a rate of change of the response measured 1.
The main difference between the fuel and base oil is in molecular weight or boiling range and the relative percentage of aromatic materials. Even though the peaks at and cm-1 are larger than the one at cm-1, it is very difficult to accurately measure them in the presence of other oil breakdown product.
Blends of petroleum lubricants with significant amounts of ester, whether part of the base-stock package or as an additive, will absorb strongly in the oxidation area. Diesel fuel is brought to approximately degrees Centigrade then held at this temperature for 30 minutes.
After soot calculation, subtraction is done and a spectral tilt correction is applied from to While this is not as sensitive as some other techniques, it is at a level where problems from the presence of water in the crankcase could begin. 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 in a condition monitoring program 13- 2.
Typically a warning or alert level will be used as an early indication of a potential problem, and an alarm level will be used as an indication of the need for immediate corrective action.
This value can asmt significant in the case of a ZnSe cell, on the order of 0.
Adequate mixing is necessary to obtain valid results. However, water levels of this magnitude will immediately condemn the lubricant. Both examples are indicative of multiple sources of the same data, low ratio of normal data to failure data or poor measurement precision. It is not the intent of this practice to e24122 or recommend normal, cautionary, warning or alert limits for any machinery.
This is why weathered fuel should be used asfm calibrate the system and calibration of fuel should be done based on fuels obtained regionally. The units used for reporting are absorbance per 0. Area to Height at Height at Verification peaks: We need your help! These lubricants are ashm presented at this time. These warning or alarm limits can be a fixed maximum or minimum value for comparison to a single measurement or can also be based on a rate of change of the response measured 1.
ASTM E2412 – 10
As seen below in Fig. If the empty cell is used to create the background spectrum, or when a 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. More levels may be used, but at the expense of increased complexity.
This is not considered a problem because of the greater significance the presence of glycol has to engine operation. Features in the wstm spectrum indicative of the molecular level components of interest 1,7 that is, water, fuel, antifreeze, additive, degradation, and so forth are measured and reported. NOTE 6—Oxidation region for lubricant blends with diesters base oil d2412 be adjusted to to Such limits should be established in conjunction with advice and guidance from the machinery manufacturer and maintenance group.
Glycol standards should be freshly prepared and analyzed. In this case the maximum negative peak in the range from to cm-1 with baseline points over the same range is used as shown in Fig. This band is a fairly specific measure of over basing e242 consumption and directly relates to the TBN assay for engine oils.
As this area is closely associated with the water measurement area, a localized, single—point baseline at cm-1 provides a correction for low levels of water buildup Fig.
If an appropriate reference oil cannot be obtained, spectral subtraction should not be performed. Water is measured as depicted in Fig. Spectral characteristics of glycol contamination are shown in Fig. 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 in a condition monitoring program 1, In some cases, notably winter diesel fuel, the peak used for fuel residue is broader than that shown in Fig.
Measurement parameters for petroleum lubricants are presented. For example, infrared spectroscopy cannot determine wear metal levels or any other type of elemental analysis.
Procedures for preparing representative weathered fuel may vary, but e212 following should serve as a guideline: