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ASTM D2144-07(2021)
Standard Practices for Examination of Electrical Insulating Oils by Infrared Absorption
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NORMA vydána dne 1.12.2021
Informace o normě:
Označení normy: ASTM D2144-07(2021)
Datum vydání normy: 1.12.2021
Kód zboží: NS-1045488
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM D2144-07(2021) :
Keywords:
electrical insulating oils, infrared, oil, spectrophotometer ,, ICS Number Code 29.040.10 (Insulating oils)
Doplňující informace
| Significance and Use | ||||||||
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5.1?The infrared spectrum of an electrical insulating oil is a record of the absorption of infrared energy over a range of wavelengths. The spectrum indicates the general chemical composition of the test specimen. Note 2:?The infrared spectrum of a pure chemical compound is
probably the most characteristic property of that compound.
However, in the case of oils, multicomponent systems are being
examined whose spectra are the sum total of all the spectra of the
individual components. Because the absorption bands of the
components may overlap, the spectrum of the oil is not as sharply
defined as that for a single compound. For these reasons, these
practices may not in every case be suitable for the quantitative
estimation of the components of such a complex mixture as mineral
oil.
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| 1. Scope | ||||||||
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1.1?These practices are to be used for the recording and interpretation of infrared absorption spectra of electrical insulating oils from 4000 cm?1 to 400 cm?1 (2.5 ?m to 25 ?m). Note 1:?While these practices are specific to ratio recording
or optical null double-beam dispersive spectrophotometers,
single-beam and HATR (horizontal attenuated total reflectance),
Fourier-transform rapid scan infrared spectrophotometers may also
be used. By computerized subtraction techniques, ratio methods can
be used. Any of these types of equipment may be suitable if they
comply with the specifications described in Practice E932.
1.2?Two practices are covered, a Reference Standard Practice and a Differential Practice. 1.3?These practices are designed primarily for use as rapid continuity tests for identifying a shipment of oil from a supplier by comparing its spectrum with that obtained from previous shipments, or with the sample on which approval tests were made. They also may be used for the detection of certain types of contamination in oils, and for the identification of oils in storage or service, by comparison of the spectra of the unknown and known oils. The practices are not intended for the determination of the various constituents of an oil. 1.4?WarningInfrared absorption is a tool of high resolving power. Conclusions as to continuity of oil quality should not be drawn until sufficient data have been accumulated so that the shipment-to-shipment variation is clearly established, for example. 1.5?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||
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