Other Measurements Carried Out With The Conductivity Cell; Tds Parameter; Salinity; Resistivity - XS Instruments Revio Manual De Instrucciones

Other measurements carried out with the Conductivity cell

The conductivity measurement can be converted into the TDS, Salinity and Resistivity parameters.
In measure mode, press the key
•

Resistivity.

• These parameters use the Conductivity calibration; therefore, refer to the previous paragraph to
calibrate the sensor.

• TDS Parameter

Total Dissolved Solids (TDS) correspond to the total weight of the solids (cations, anions and non-dissociated
substances) in a liter of water. Traditionally, TDS are determined using the gravimetric method, but a simpler
and faster method is to measure Conductivity and convert it to TDS by multiplying it by the TDS conversion
Factor. Within the Conductivity setup menu
conductivity/TDS conversion factor.
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

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).
ù
• Resistivity
Resistivity is preferable for low conductivity measurements, such as ultrapure water or organic solvents.
Resistivity represents the reciprocal of the conductivity ρ= 1/κ (MΩ*cm).

Dissolved oxygen measurement (mg/l and Saturation %)

Connect the polarographic sensor to the RCA / CINCH Temp connectors in the top panel of the device violet
part. It is not necessary connect an external temperature probe, because it is already integrated.
• O Parameter Setup
2
• In measure mode press
• Scroll parameters using directional keys until the "OXY"
• Move with the keys
UM ReVio EN rev.0 04.06.2020
to scroll through the various parameters TDS -> Salinity ->
Conductivity of the solution
1-100 µS/cm
100 – 1000 µS/cm
1 – 10 mS/cm
10 – 200 mS/cm
to access the SETUP menu.
and to select the program to access.
34
access the "TDS factor" option to change the
TDS Factor
0.60
0.71
0.81
0.94
2 -10.67869R 3 +5.98624R
menu and enter pressing
4 -1.32311R 5
key.
EN