horiba B-711, Instruction Manual

Page: 19 / 34

11
5.4 Two-point calibration (B-712/B-713)
8.
Press the MEAS switch for 0.5 seconds to enter the measurement
mode and prepare for measurement.
1.
Set “Two-point calibration” (refer to page 19).
2.
Open the light shield cover and put some drops
of the pH 7 standard solution on the flat sensor
to cover the entire flat sensor.
Washing the sensor with the standard solution
beforehand may provide more accurate calibration.
3.
Close the light shield cover and press the CAL
switch for over 2 seconds.
and blink and the calibration value is
displayed.
After the calibration is completed,
and
stop blinking and light steadily.
4.
After the calibration for pH 7 is completed,
open the light shield cover to remove the
pH 7 standard solution and remove mois-
ture on the sensor.
5.
Put some drops of the pH 4 standard solution
on the flat sensor to cover the entire flat
sensor.
Washing the sensor with the standard solution
beforehand may provide more accurate calibration.
6.
Close the light shield cover and press the CAL
switch for over 2 seconds.
and blink and the calibration value is
displayed.
After the calibration is completed,
and
stop blinking and light steadily.
7.
Clean the sensor with tap water and
remove moisture.
Light shield
cover
Light shield
cover