13
AUTORANGING
The EC (
AD310
) and TDS (
AD410
) scales are
autoranging. The meter automatically sets the scale with
the highest possible resolution.
By pressing SHIFT and FIXED keys,
the autoranging feature is disabled.
The current range is frozen on the
LCD and the tag corresponding to the
selected measurement range starts
blinking.
To restore the autoranging feature press the SHIFT and
FIXED keys again.
Note:
Autoranging is automatically restored if range is
changed, if setup or calibration mode is entered,
or if meter is turned off and back on again.
•
Make sure the meter is calibrated before taking
measurements.
•
If measurements are taken successively in
different samples, for accurate reading it is
recommended to rinse the probe thoroughly with
deionized water before immersing it into the
sample.
16
CALIBRATION
STANDARD CALIBRATION
EC (
AD310
) or TDS (
AD410
) calibration is a single
point procedure. Selectable points are 0.00, 84.0 and
1413
μ
S/cm, 5.00, 12.88, 80.0 and 111.8 mS/cm for EC
calibration (
AD310
); 800, 1382 ppm and 6.44, 40.0 ppt
for TDS calibration (
AD410
).
• Rinse the probe with selected
calibration solution or deionized
water, then immerse it into the
solution. The sleeve holes must be
completely submerged.
• Tap the probe repeatedly to remove
any air bubbles that may be trapped
inside the sleeve.
• To enter calibration mode, press SHIFT
and then CAL from measurement
mode.
•
The LCD will show the “CAL” message for a few
seconds, followed by the not calibrated EC (
AD310
)
or TDS (
AD410
) reading together with blinking
hourglass symbol.