Calibration; Selecting A Standard; Performing A Calibration; Sample Measurement - Mettler Toledo SevenGo SG3 Instrucciones De Manejo

Calibration / Sample measurement
4.2

Calibration

4.2.1 Selecting a standard

When using the SevenGo™ SG3 conductivity meter, you have to select a standard for calibration.
Press and hold until the current standard blinks.
Use the or key to select another standard. When the desired standard blinks, press Read to confirm
your selection.
The following three predefined standards are available:
- 84 µS/cm
- 1413 µS/cm
- 12.88 mS/cm
Tables for automatic temperature compensation are programmed in the meter for each standard (see also
Appendix).

4.2.2 Performing a calibration

Place the conductivity sensor in the defined calibration standard and press Cal.
With the default setting, the SevenGo™ conductivity meter automatically endpoints when the signal is stable.
To manually endpoint, press Read. The meter displays the value of the standard followed by the cell constant
after a few seconds.
To accept the calibration and return to sample measurement, press Read. To reject the calibration, press
Exit.
Note
To ensure the most accurate conductivity readings, you should verify your cell constant with a standard
solution regularly and recalibrate if necessary. Use always fresh standards.
4.3

Sample measurement

4.3.1 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 A is the default setting of the meter.
When the signal has stabilized, the display automatically freezes, and
By pressing and holding down Read key, you can switch between auto and manual endpoint mode. To
manually endpoint a measurement, press Read, the display freezes and
Stability criterion for conductivity measurement
The sensor input signal of the must not deviate by more than 0.4% from the measured average conductivity
of the probe in 6 seconds.

4.3.2 TDS/salinity/resistivity measurement

To perform a TDS/salinity/resistivity measurement, follow the same procedure as for a conductivity measure-
ment. Press Mode to switch between conductivity, TDS, salinity and resistivity measurement modes.
Note
For accurate measurement with the SevenGo™ SG3 conductivity meter it is important to use an electrode with
a built-in temperature sensor. The use of the special IP67 conductivity and temperature sensor InLab
guarantees optimum performance even in very humid environments.
10
appears.
appears.
METTLER TOLEDO SevenGo™ conductivity
737
®