User Guide

37
To obtain accurate readings, use the calibration solution in
the selected range and closer to the values to be measured.
Offset Calibration
• To perform the EC or TDS calibra-
tion enter the calibration mode, by
pressing CAL and entering the pass-
word.
• After the correct password is en-
tered, the control actions stop and
the primary LCD will display the first
EC or TDS calibration value, with
the "CAL" indicator blinking. The sec-
ondary LCD displays the
temperature.
Note If the wrong password is entered the system reverts back to
normal operation, displaying EC or TDS values.
• 0 is the default value for the 1
st
cali-
bration point. Dry the conductivity
probe and leave it in air.
• Only when the reading is stable the
"CAL" indicator will stop flashing (af-
ter about 30 seconds) and the
"READY" and "CFM" indicators will
start blinking.
• Press CFM to confirm the calibration
point; the primary LCD will display
the second expected buffer value.
If the zero calibration cannot be per-
formed, "ERROR" will blink.
Cell constant calibration
• Select the solution value on the
primary display by pressing 
or  if the selected range has
two possibilities (e.g. 5.000 and
12.880 mS).
• Immerse the EC/TDS probe with the temperature sensor in
the selected solution. The level of solution must be higher