Salinity; Data Logger Function; Setup For Data Logger Parameter - XS Instruments 70 Serie Manuel D'utilisation

Here below, the TDS factors in relation to the Conductivity value are shown:
The TDS measurement is expressed in mg/l or g/l depending on the value.
 Salinity
COND 70 Vio, PC 70 Vio
Usually the UNESCO 1978 definition is used for this parameter, which involves the use of the unit of
measurement psu (Practical Salinity Units), corresponding to the ratio between the conductivity of a sample
of sea water and standard KCl solution formed by 32.4356 grams of salt dissolved in 1 kg of solution at 15°
C. Ratios are dimensionless and 35 psu is equivalent to 35 grams of salt per kilogram of solution. Therefore,
approximately 1 psu is equivalent to 1g / L of salt and considering the density of the water it equals 1 ppt.
The UNESCO 1966b definition can also be used, which provides that the salinity in ppt is expressed with the
following formula:
S =-0.08996+28.2929729R+12.80832R
ppt
Where R= Cond sample (at 15°) / 42.914 mS/cm (Conductivity of Copenhagen Seawater Standard).

Data Logger Function

This series of devices has the possibility of recording values in GLP format on the instrument's internal
memory.
 The instrument can save up to 1000 data in total. Once the memory is finished, the values are NOT
overwritten. In measure mode, the number of data stored for that parameter appears next to the M+
icon.
It is possible to recall and consult the values on the display or download them to a PC using the

appropriate software.
 If you have the possibility to work directly connected to the PC, the data are automatically saved on
the software without having memory limitations.
 Recordings can be acquired manually (MANUAL) or automatically at preset frequencies (HOURS -
MINUTES).
PC Connection : connect the USB cable inside each package to the USB port on the top panel of the
instrument and the other end to a COM port on the computer.
Use the USB cable supplied with the instrument only.
 Setup for Data Logger parameter
 In measure mode press button
Use the directional keys to move to LOG SETTINGS P8.0 and access the menu by pressing the key

.
 Move with the keys
UM Serie 70Vio EN rev. 1 04.06.2020
Conductivity of the solution
1-100 µS/cm
100 – 1000 µS/cm
1 – 10 mS/cm
10 – 200 mS/cm
2 -10.67869R 3 +5.98624R
to access the SETUP menu.
and to select the program to access.
29
TDS Factor
0.60
0.71
0.81
0.94
4 -1.32311R 5
EN