Hanna Instruments HI 84185 - Manual (Page 6)

6
PRINCIPLE OF OPERATION
The determination of ammonia nitrogen concentration is made according to double standard addition
method. This technique enables an unknown concentration and the electrode’s slope factor to be
determined simultaneously.
The Automatic Temperature compensation is available using HI 7662-T temperature probe. By
setting the electrode isopotential point and enabling temperature compensation option in Setup
menu, the obtained concentration is temperature compensated.
The accuracy of the obtained result depends on the stability of the mV reading in every step of the
measurement.
Three selectable stability criteria can be selected in Setup menu. Select Medium or Accurate
criteria in order to have accurate analysis.