Hanna Instruments HI 84181 - Manual (Page 5)

5
PRINCIPLE OF OPERATION
The determination of potassium 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.
Range 0.0 to 5.0 g/L (ppt) K +
Resolution 0.1 g/L (ppt) K +
Accuracy ±5% of reading (see note)
Sample volume 50 mL
Temperature Compensation Automatic from 0 to 80 °C
Electrodes HI 61014 Potassium half cell
HI 5315 Reference half cell
Temperature Probe HI 7662-T (included)
LOG feature 50 samples
Stirring speed 500 rpm
Environment 0 to 50 °C (32 to 122 °F); max 95% RH non-condensing
Power supply 220V/50Hz; 10VA
Dimensions 208 x 214 x 163 mm (8.2 x 8.4 x 6.4") (with beaker)
Weight 2200 g (77.6 oz.)
Note: Above 2.5 g/L the instrument provides information about the approximate potassium content.
REQUIRED REAGENTS
Code
Description Quantity/Test
HI 84181-0 ISA 2 mL
HI 84181-1 Standard 1 2 mL
HI 84181-2 Standard 2 2 mL
SPECIFICATIONS