This standard describes a method for the determination of water in unused or used insulating liquids with coulometrically generated Karl Fischer reagent. The method is applicable to water concentrations of 2 mg/kg to 100 mg/kg. The precision data given in Clause 10 apply only to new oils with viscosity less than 20 mm2/s at 40 °C (see note).
Appendix A contains two suitable methods for preparing the reagents which may be useful in countries where it is difficult to buy prepared reagents.
This method should be supplementary to the classical Karl Fischer titration as described in
I E C Publication 733: Determination of Water in Insulating Oils, and in Oil-impregnated
Paper and Pressboard, and in case of dispute this latter method shall be used as a reference
for arbitration.
Note. — For liquids in service, the accuracy of the method may be affected by the presence of contaminants and degradation products.
SIS SS IEC 814:1986 history
1986SIS SS IEC 814:1986 Insulating oils - Determination of water in insulating liquids by automatic coulometric Karl Fischer titration