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Cal 2 appears on the display. The meter endpoints according to the preselected endpoint mode after
the signal has stabilized or after pressing READ. The relevant buffer value is shown on the display.
5 Repeat the steps b - d for all calibration buffers.
6 Press End to end the calibration procedure.
Alternatively, the meter ends the calibration automatically when 5 calibrations are performed. The offset
value and slope are shown on the display.
7 Press Save to keep the calibration.
8 Press EXIT to reject the calibration.
Note
Up to 5 calibrations can be saved for a dedicated sensor ID. The oldest calibration data is automatically
overwritten with the current calibration data.
4.9 Automatic buffer recognition
The meter features automatic pH buffer recognition for the predefined buffer groups (see "Appendix"). The
buffers within a buffer group are automatically recognized by the meter and displayed during calibration.
This feature allows the calibration in any order within a predefined pH buffer group.
There is no automatic pH buffer recognition for customized buffer groups; in this case, the defined order of the
buffers needs to be followed.
4.10 Sample measurements
Place the sensor in the sample and press READ to start a measurement.
The display shows the readings of the sample in either the single channel or dual channel mode.
Note: to switch between the single and dual channel measurement screen, press and hold MODE for 3
seconds.
The endpoint format blinks, indicating a measurement is in progress.
As soon as the measurement is stable according to the selected stability criterion, the Stability icon
appears.
Note
If the "automatic endpoint" format is selected, the measurement stops automatically as soon as the
Stability icon appears.
If the "manual endpoint" format is selected, press READ to manually stop the measurement.
If the "timed endpoint" format is selected, the measurement stops after the preset time.
4.11 Temperature compensation
We recommend the use of either a built-in or a separate temperature probe. If a temperature probe is used, ATC
and the sample temperature are displayed. If no temperature sensor is used, MTC is displayed and the sample
temperature should be entered manually.
The meter accepts only an NTC 30 kΩ temperature sensor.
In the pH and ion mode, the meter calculates the temperature-adjusted electrode slope using this temperature
and shows the temperature-compensated pH/ion value in the measurement display.
In the conductivity mode, the meter uses this temperature to calculate with the entered alpha-coefficient (or with
non-linear correction) the conductivity value back to the chosen reference temperature.
14
Operating the pH/ORP/Ion/Conductivity meter SG78
SevenGo Duo pro™
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