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
The electrode was specially designed to detect the broken
electrode based on a shifted ISO potential value. Setting
the meter to pH‑mV range the user can check the sensor
status at any time. The electrode quality can be checked by
measuring the offset value in pH 4.01 buffer (25ºC/77ºF)
and reading the mV value that should be between 10mV to
50mV. If this reading is outside of this range the electrode
is considered “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 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 displayed.