Thermo Fisher Scientific CyberScan CON 400 (For units manufactured from March 2010 onwards) - Manual (Page 39)

Instruction Manual CON 400
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7.5.4 P4.4 Setting the TDS factor
The concentration of salts dissolved in solution increases the conductivity of that solution. This
relationship varies from salt to salt and is roughly linear over a given range for a given salt.
The TDS conversion factor is the number used by the meter to convert from conductivity to
TDS.
To determine the conductivity to TDS conversion
factor for your solution:
Addendum 2 on page 46 explains the calculation in
determining the conductivity to TDS conversion factor.
You can set the TDS conversion factor between 0.40 and
1.00; meter default is 0.50.
From measurement mode
1. Press
SETUP key to enter Set Up mode.
2. Press the MI/S or MR/T keys to scroll through
subgroups until you view parameter P4.0.
3. Press the ENTER key five times to select parameter
4.4. The upper display shows “tdS” and the lower
display shows “P4.4”.
4. Press the ENTER key again. The upper display
shows a value and the lower display shows “tdS”.
5. Calculate the TDS factor of your solution. See
Addendum 2 on page 46 for information on how to
calculate the TDS factor.
6. Press the MI/S or MR/T keys to select your
calculated TDS conversion factor.
7. Press the ENTER key to confirm selection and to
return to the subgroup menu. Press the CAL/MEAS
key to return to measurement mode.
Figure 29 - Change of TDS factor