Salinity; Data Logger Function - XS Instruments pH 60 VioLab Manuel D'utilisation

 When the value flashes, use the directional keys as indicated by the icon
value and confirm with
By default, the TDS factor is set at 0.71; the user can change it between 0.40 ... 1.00.
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 60 VioLab, PC 60 VioLab
Usually the UNESCO 1978 definition is used for this parameter, which involves the use of the psu unit of
measurement (Practical Salinity Units), corresponding to the ratio between the conductivity of a sample of
sea water and one of a 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 equals 35 grams of salt per kilogram of solution. So
approximately 1 psu equals 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.
Data Logger on external printer:
Purchase the printer separately, connect it with RS232 cable to the connector identified with "Printer" on
the rear panel of the instrument, connect the power supply to the grid power and switch it on by pressing
the I / O button. For further information, refer to the technical manual of the printer.
Use the printer specified by the manufacturer only. Contact your local distributor for purchasing or further
information. The original printer is already equipped with a roll of plain paper, power supply and RS232
cable for instrument connection.
UM Serie 60VioLab rev.0 20.05.2020
.
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
29
to enter the correct
TDS Factor
0.60
0.71
0.81
0.94
4 -1.32311R 5
EN