变压器油中水分含量检测方案

Metrohm 899库仑水分测定仪联用885全自动卡式炉样品处理器测定变压器油中水分含量KF Application Note K-47 Determination of the watercontent in transformer oil with885 Compact Oven SampleChanger and 899 Coulometer t [s] This Application Note describes the determination of the water content intransformer oil using the oven technique. Sample Allmeasurements were carried out at the sametemperature using the same parameters. In a first step， the titration vessel was conditioned. Thena determination with an empty sample vial was carriedout to prepare the system and rinse all tubing. Followingthe system preparation， three blank values (emptysample vials) were determined and the mean value ofthe blank was saved as common variable. Since half ofthe sample vial was filled with sample， half of the blankvalue was subtracted from the EP of the sampledetermination (for more information on blank values，see AN-K-48). Subsequently， the water content of thesamples wasdetermined.Betweentwosamplemeasurements， the titration vessel was conditionedagain. Parameters 899 Coulometer HYDRANALQ- Coulomat AG Oven Conditioning on HYDRANALQ- Start drift 10 ug/min Drift correction auto Automatic start off Sample Changer Stabilizing time 10s Cond. stop time off Measured value off display 6.2141.390 Pause Os Request sample ID off Request sample size off Request sample unit off Hold at request off Endpoint at 50 mV Titration rate optimal Stop criterion rel. drift Relative stop drift 10 pg/min Extraction time 120s Generator electrode with diaphragm Generator current auto mA Stirrer on Stirring rate 15 l(pol) 10 uA Electrode test off Time interval MP 2s lemperature 25°C Stop time off Parameters 885 Compact Oven Sample Changer Temperature 105°C Flow rate 100 mL/min Gas supply valve Gas type nitrogen End of series conditioning Results Mean (n=10) [ug/g] RSD [%] 20.5 1.56 www.metrohm.com