Calibration By Entering A Cell Constant; Sample Measurement; Performing A Conductivity Measurement; Performing A Tds/Salinity/Resistivity Measurement - Mettler Toledo SevenGo pro SG7 Mode D'emploi

4.4.2 Calibration by entering a cell constant

- Under menu setting: "4. Set cal.", select item "5. Cell const." Return to measurement screen.
- Press the Cal key and use the softkeys to enter the correct cell constant of your sensor.
- Press Enter to confirm.
- To use the entered cell constant for later measurements: Press Save.
- To discard the cell constant: Press Cancel.
Note
- To ensure the most accurate conductivity readings, you should regularly verify your cell constant with a
standard solution and recalibrate if necessary. Use always fresh standards.
- Calibration with the conductivity standard programmed in the instrument can only be performed at a
temperature of 0 °C to 35 °C.
- The second point required for the calibration curve is permanently programmed in the SevenGo and is
0 S/m for a specific resistivity tending toward infinity.
- Temperature dependencies cannot be programmed for the customized standard (25 °C). It is therefore
important to have samples and standard solution at the same temperature, when using a customized
standard.
4.5

Sample measurement

4.5.1 Performing a conductivity measurement

Place the conductivity sensor in the sample and press Read to start the measurement: the decimal point
blinks.
The display shows the conductivity of the sample. The automatic endpoint
When the sensor output has stabilized, the display automatically freezes, and
The automatic endpoint algorithm is as follows: The measured conductivity of the sample may not deviate
by more than 0.4% from the measured average conductivity in 6 seconds.
Select the automatic, manual or timed endpointing mode in the menu under "Set meas.-EP format".
To manually endpoint a measurement press Read, the display freezes and
If the timed endpointing method is selected, the display freezes automatically after the set time has elapsed
and appears.

4.5.2 Performing a TDS/salinity/resistivity measurement

Press the Mode key to switch between conductivity, TDS, salinity and resistivity measurement modes.
For TDS measurement you can set the TDS factor in the item "4. TDS factor" under the menu "2. Set meas."
The meter accepts a TDS factor range of 0.4 to 1.0.
To perform a TDS/salinity/resistivity measurement, follow the same procedure as for a conductivity mea-
surement.
METTLER TOLEDO SevenGo pro™ conductivity
Calibration / Sample measurement
is the meter's default setting.
appears.
appears.
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