Xylem wtw pHotoFlex pH Quick Start Manual page 15

®
pHotoFlex pH
Measuring the ORP
Calibration
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1 Submerse the ORP electrode in the sample.
pH & ORP \ ORP
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25.0
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2 Press the <M> key (short pressure) repeatedly until the
measured parameter, pH is selected.
1 Press the <M> key (long pressure) repeatedly until the pH
measuring mode is selected.
2 Press the <CAL/ZERO> key.
The menu-guided calibration begins.
Follow the instructions on the display.
Calibrate
 at regular intervals
 after connecting another electrode
 when the sensor symbol flashes:
– after the calibration interval has expired
– after voltage interruption (e.g. empty batteries, empty
rechargeable battery)
mV
°C
Operation
15