The HI 904 excels at determining water content in extremely small concentrations (1 ppm to 5%) and requires no titrant, instead using a generator electrode. It is useful for coulometric analyse of water according Karl Fischer (ASTM D 6304, D 4928) and bromine index (ASTM D 2710, D 1159), eg. in  the crude oil fractions, crude oil, solvents, fats.
Range   1 ppm to 5%
Resolution   1 ppm (0.0001%)
Accuracy   1%
Sample Type   Liquid or Solid* (external diss./extract.)
Titration Vessel   Operating volume between 100-200 ml
Electrode Type/Connection Dual patinum pin, polarization electrode / BNC
Electrode Polarization Current 1, 2, 5,10,15, 20, 30 or 40 µA
Electrode Voltage Range 2 mV to 1000 mV
Electrode Voltage Resolution 0.1 mV
Electrode Accuracy (@25°C/77°C) ±0.1 mV