NAVI D-25 Instruction Manual page 41

2 Taking Measurements
2.5 Measuring pH
30
Calibration at second point
1.
Wash the electrode well again with pure (de-
ionized) water, and then wipe with filter paper or
tissue paper.
2.
Immerse the tip of the electrode in a beaker
containing pH 4 standard solution.
3.
Press the CAL key to start calibration.
The measured value will be displayed, and
"HOLD" will blink until the reading stabilizes.
When the value stabilizes, "HOLD" will stop
blinking and the calibrated value will be displayed.
The bottle mark will be displayed, indicating that
calibration was conducted with pH 4 standard
solution.
4.
Press the MEAS key to return to the pH
Measurement screen.
While calibrations are being performed in the Calibration
mode, redoing a calibration only updates the calibration
data for the pertinent standard solution. If a calibration is
redone after the meter is returned to the Measurement
mode, however, the calibration is conducted on the initial
status of the meter; i.e., all the previous calibration data
is cleared.
HORIBA