What is BS EN 62021-1 - Acidity of unused and used electrical mineral insulating oils?    
BS EN 62021 discusses insulating liquids.
BS EN 62021-1 is the first part of the BS EN 62021 multi-series and discusses the determination of acidity.  
BS EN 62021-1 is a part of IEC 62021 that describes the procedure for the determination of the acidity of unused and used electrical mineral insulating oils.
Who is BS EN 62021-1 - Acidity of unused and used electrical mineral insulating oils?      
BS EN 62021-1- determination of the acidity of unused and used electrical mineral insulating oils is useful for:   
- Insulating liquids manufacturers
- Quality control personnel     
Why should you use BS EN 62021-1 - Acidity of unused and used electrical mineral insulating oils?    
The test portion is dissolved in a solvent and titrated potentiometrically with alcoholic potassium hydroxide using a glass-indicating electrode and a reference electrode. The meter readings are plotted automatically against the respective volumes of titrant and the endpoint is taken when the volume corresponds to a pH of 11,5.    
BS EN 62021-1 method is used to indicate relative changes that occur in a mineral insulating oil during use under oxidizing conditions regardless of the colour or other properties of the resulting mineral oil. The acidity is used in the quality control of unused mineral oil.
