A large number of tests shows that the additional error of hydrogen exchange colunm is commonly existing in the measured values of on-line hydrogen conductivety meters in thermal power plants at present

the main cause is due to low regeneration degree of the resin.Through theoritical deduction and related calculation

the relationship between resin regeneration degree and measured conductivity deviation has been theoritically and quantitatively obtained

and recomondations for eliminating the additional error of hydrogen exchange colum being put forward as in the following:1) adopting couler variable cation resin in hydrogen exchange column

so as to timely discover the end point of resin failure;2) changing the regeneration mode of soaking the resin out side the original lon exchange resin column

adopting reasonable technology to carry out dynamic regeneration of the resin;3) a double ion exchange column system has to be equipped for the on-line hydrogen conductivity meter.