本试验方法描述了通过市售自动库仑卡尔费休滴定仪直接测定多元醇酯和二酯基航空润滑剂中水浓度的程序。经验证，该方法适用于150至3500µg/g的水浓度范围。该方法还可适用于测定该范围外的水浓度以及其他类别的流体；但是，精度声明不适用于此类用途。

The test method describes the procedure for the direct determination of water concentration in polyol ester and diester based aerospace lubricants by commercially available automated coulometric Karl Fischer titration instruments. The method was validated to cover the water concentration range of 150 to 3500 µg/g. The method may also be suitable for the determination of water concentrations outside this range and for other classes of fluids; however, the precision statement shall not be applicable for such uses.