Thermo Fisher Scientific CyberScan PC 300 - Manual (Page 50)

Instruction Manual PC 300
46
P7.4 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 1 and 2 on this sheet describes the
conversion factors and how to calculate the TDS
conversion factor for other solutions.
You can set the TDS conversion factor between 0.4 and
1.0; meter default is 0.5.
From measurement mode
1. Press SETUP key to enter Set Up mode.
2. Press the or keys to scroll through subgroups
until you view parameter P7.0.
3. Press the ENTER key five times to select parameter
7.4. The upper display shows “tdS” and the lower
display shows “P7.4”.
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 this sheet for information on how to
calculate the TDS factor.
6. Press the or 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 39 - Change of TDS factor