Hach-Lange POLYMETRON 83xx User Manual - Manual (Page 20)

2 E LECTRODES C ONDUCTIVITY P ROBE - I NSTRUCTION M ANUAL
Page 16 09/2010 621=183=000 Issue B
Probe calibration
Whenever possible, we advise proceeding in
the following order:
• Temperature calibration
¾ It's an indispensable operation during
the commission for taking into account
the resistivity of the cable and offset
probe Pt100.
¾ Immerse the probe in a solution for
about 10 mn.
¾ Record the temperature of the solution
with a thermometer (precision < ± 0.1°C).
¾ Programm the transmitter in process
calibration mode.
¾ Adjust the value of the temperature read
with that of the thermometer.
• Conductivity calibration
First method (recommended) :
¾ Programm the transmitter in electrical
calibration mode. Choose the resistance
the closest possible to your process
(see table on the following page).
¾ First point: Remove the probe from the
liquid or unscrew the connector (Infinite
resistance, taking into account the
capacity of the cable).
¾ Second point: Connect the resistance
(precision < 0,1 %) of the value
programmed at the IN/OUT terminals of
the conductivity module.