Hach-Lange POLYMETRON 83xx User Manual - Manual (Page 19)

2 E LECTRODES C ONDUCTIVITY P ROBE - I NSTRUCTION M ANUAL
621=183=000 Issue B 09/2010 Page 15
• « Average conductivity » zone:
No particular precautions in this zone:
choose f = 1 kHz.
• « High conductivity » zone:
When the measurement frequency is low,
the surface of the electrodes will very
quickly saturate (formation of an insulating
layer reducing the flow of current, a
phenomenon known as "polarisation").
Choose f > 1 kHz
REMARK
9125 : select the "automatic frequency"
mode, in order to automatically set the best
frequency according to the measurement
range.
Definition of the cell constant value:
Enter real cell constant value of the probe (this
value is indicated in the certificate, it is
determined with a precision <
2 % in
compliance with ASTM D 1125 and ISO7888
standards).
Definition of the temperature
compensation mode:
Programm the mode of temperature
compensation of the transmitter according to
the characteristics of the process (see & 1,
influence of the temperature).