13
CALIBRA
TIONS
12 hours (unless the batteries are removed).
The electrode condition is evaluated only if the current pH
calibration has two points.
5 bars: excellent condition
4 bars: very good condition
3 bars: good condition
2 bars: fair condition
1 bar: poor condition
1 bar blinking: very poor condition
With 1 bar it is recommended to clean the electrode and
recalibrate. If there is still only 1 bar or 1 bar blinking,
replace the probe.
SENSOR
CHECK
Setting the meter to pH‑mV range the user can check the
sensor status at any time. The offset value is the mV read‑
ing in pH 7.01 buffer (@ 25 °C/77 °F). If this reading
is outside the range ±30 mV, the electrode is considered
“very poor”. The slope value of the sensor is the difference
between readings in pH 7.01 and in pH 4.01 buffers. When
the slope reaches the value of about 150 mV, the electrode
is considered “very poor“. When “poor“ or “very poor“, it
is recommended to replace it with a new one.
Note: To ensure reliable readings, the electrode must be
cleaned with cleaning solution before measuring the offset
and then hydrated in storage solution for a minimum of
30 minutes before calibrating the probe.
EC calibration
Rinse the tip off and shake excess droplets from the probe.
Select calibration type “
EC STD
“
. The meter enters
the calibration mode and “
1.41 USE
” is displayed with
tag blinking. Immerse the probe in 1.41 mS/cm
or 5.00 mS/cm calibration solution. If the standard value
is recognized “
REC
“ is displayed then “
WAIT
“ until the
calibration is accepted. The LCD will display “
SAVE
” for
1 second and return to normal measurement mode. If the
standard is not recognized “
--- WRONG
“ is display. Change
the standard, clean the electrode or press any key to exit
calibration. When the calibration procedure is completed,
the tag is turned on.