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ASTM D1533-00(2005)

Historical Reaffirmation

Standard Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration

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1.1 This test method covers the measurement of water present in insulating liquids by coulometric Karl Fischer titration. This test method is used commonly for test specimens below 100 % relative saturation of water in oil. The coulometric test method is known for its high degree of sensitivity (typically 10 g H2O). This test method requires the use of equipment specifically designed for coulometric titration.

1.2 This test method recommends the use of commercially available coulometric Karl Fischer titrators and reagents.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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 practice and determine the applicability of regulatory limitations prior to use. For specific precautionary statements see and .


Electrical characteristics of an insulating liquid may be affected deleteriously by excessive water content. A high water content may make a dielectric liquid unsuitable for some electrical applications due to deterioration of properties such as the dielectric breakdown voltage.

These tests are suitable for use in acceptance specifications, in control of processing, and in evaluating the condition of dielectric liquids in service.

SDO ASTM: ASTM International
Document Number D1533
Publication Date Oct. 1, 2005
Language en - English
Page Count 5
Revision Level 00(2005)
Supercedes
Committee D27.06
Publish Date Document Id Type View
Nov. 1, 2020 D1533-20 Revision
Dec. 1, 2012 D1533-12 Revision
April 10, 2000 D1533-00 Revision
Oct. 1, 2005 D1533-00R05 Reaffirmation