ASTM D2144-07
Standard Practices for Examination of Electrical Insulating Oils by Infrared Absorption

Standard No.

ASTM D2144-07

Release Date

2007

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D2144-07(2013)

Latest

ASTM D2144-07(2021)

Scope

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 28212;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.

1.1 These practices are to be used for the recording and interpretation of infrared absorption spectra of electrical insulating oils from 4000 to 400 cm^-1 (2.5 to 25 956;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 E 932.

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 Warning-Infrared 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.

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 and health practices and determine the applicability of regulatory limitations prior to use.

ASTM D2144-07 Referenced Document

• ASTM D923 Standard Practices for Sampling Electrical Insulating Liquids
• ASTM E131 Standard Definitions of Terms and Symbols Relating to Molecular Spectroscopy
• ASTM E168 Standard Practices for General Techniques of Infrared Quantitative Analysis
• ASTM E932 Standard Practice for Describing and Measuring Performance of Dispersive Infrared Spectrometers

ASTM D2144-07 history

• 2021 ASTM D2144-07(2021) Standard Practices for Examination of Electrical Insulating Oils by Infrared Absorption
• 2007 ASTM D2144-07(2013) Standard Practices for Examination of Electrical Insulating Oils by Infrared Absorption
• 2007 ASTM D2144-07 Standard Practices for Examination of Electrical Insulating Oils by Infrared Absorption
• 2001 ASTM D2144-01e1 Standard Test Methods for Examination of Electrical Insulating Oils by Infrared Absorption
• 2001 ASTM D2144-01 Standard Test Methods for Examination of Electrical Insulating Oils by Infrared Absorption
• 1994 ASTM D2144-94 Standard Test Methods for Examination of Electrical Insulating Oils by Infrared Absorption