Karl Fisher Titration

We measure the factor of KF titrator on daily basis before measuring the water content by KF titration. We do this once in day as a in-house practice. We take three measurement. We use WFI or Purified water for this factor determination. What should be the ideal RSD % limit for this three measurement? We are using less than or equal 2.0%.

What is the general practice for this activity?

% RSD for three value of KF factor should not be more than 1.00 %