37
Note
A 2-point calibration is always suggested. However the EC calibration can also be per-
formed at 1 point. To calibrate offset only, just press CAL after confirmation (with CFM)
of the zero reading; the meter will return to normal operational mode. To have the cell
constant calibrated first, press the up or down arrow keys after entering the calibration
procedure to skip to the next possible calibration buffer. In this case, after confirmation
of the cell constant, the meter will ask for the offset calibration displaying zero on the
LCD; press CAL to exit or calibrate the offset, if desired.
Note
The calibration value shown is referenced at 25 °C even if the reference temperature of
20 °C has been selected.
Note
During calibration, press LCD to display the cell constant value on the primary display.
Press LCD again to return to calibration buffer visualization.
Note
To interrupt the calibration procedure press SETUP to restart the procedure, or CAL to
exit to normal operational mode.
Note
If the process meter has never been calibrated or an EEPROM reset has occurred, the
meter continues to perform measurements. However, the user is informed of an EC or
TDS calibration requirement by a blinking “CAL” indication (see “Startup” section).
Note
The device must be calibrated within the temperature range specified for the EC or TDS
buffer solution.
CELL CONSTANT DIRECT SELECTION
Whenever the EC/TDS probe cell constant is known, it is possible to directly calibrate
the meter using that value.
• Press CAL to enter calibration mode. The LCD will show the default offset of 0.
• Press LCD to display the current cell constant on the primary LCD (factory default
value is 2.000 cm
-1
).
• Press SETUP key.
•
Using
,
and
,
enter the probe cell constant (the value must be between
1.333 and 4.000 cm
-1
) and confirm by pressing CFM.
