Thermo Fisher Scientific CyberScan CON 10/CON 100/CON 200 - Manual (Page 15)

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4 C A L I B R AT I O N
4.1 Standard solutions for calibration
Select conductivity or TDS calibration solution (available from the distributor) which is close to
the expected conductivity of the sample that you want to measure. Ensure that the calibration
solution which you use comes with a “Temperature vs Conductivity” or a “Temperature vs
TDS” label on it. This information is required during calibration.
NOTE: Eutech’s calibration solutions are supplied in shatterproof bottles of 480 ml. Refer to
section 12 for Ordering Information and details for other accessories.
In CON 100 meter, calibration is only done in the conductivity (COND) mode. The CON 10
and CON 200 meters allow calibration either in the conductivity range or the TDS range but
not both. As such, a calibration in the TDS mode of a particular range will replace a prior
calibration in the conductivity mode if both ranges are the same (i.e. Range 2 in COND and
Range 2 in TDS).
In general, it is recommended that calibration be performed around a point close to 2/3 of full
scale. For better accuracy, perform a calibration close to the expected measurement range
prior to the measurement.
Corresponding TDS values are obtained by multiplying the recommended conductivity values
by the TDS factor. The default TDS factor is 0.5.
4.2 Preparing the meter for calibration
Before starting calibration, make sure you are in the correct measurement mode. When you
switch on the meter, the meter starts up in the measurement mode you shut it off in previously.
For example, if you shut the meter off in COND measurement previously, the meter will come
back into COND measurement when you switch the meter on.
Before calibrating, select the correct mode by pressing the MODE key. There are 3 modes:
COND for conductivity measurements,
TDS for total dissolved solids (TDS) measurements,
TEMP for temperature measurements.