27
Rev. 1.0 31/01/2020
EN
•
Filling solution for ORP electrodes.
Conductivity Parameter
COND 60 VioLab, PC 60 VioLab
Connect the Conductivity probe to the BNC type connector marked in grey, while the temperature probe
must be connected to the RCA / CINCH Temp connector always on a grey background.
Conductivity is defined as the ability of the ions contained in a solution to conduct an electric current. This
parameter provides a fast and reliable indication of the quantity of ions present in a solution.
•
…how to get Conductivity?
The first Ohm's law expresses the direct proportionality in a conductor between the current intensity (I) and
the applied potential difference (V), while the resistance (R) represents its proportionality constant.
Specifically: V = R x I, the resistance is consequently R = V / I
Where R = resistance (Ohm) V = voltage (Volt) I = current (Ampere)
The inverse of the resistance is defined as conductance (G) G = 1 / R and is expressed in Siemens (S)
Measuring resistance or conductance requires a measuring cell, which consists of two opposite charge
poles. The reading depends on the geometry of the measuring cell, which is described through the constant
cell parameter C = d / A expressed in cm
-1
where d represents the distance between the two electrodes in
cm and A their surface in cm
2
. The conductance is transformed into specific conductivity (k), which is
independent of the cell configuration, multiplying it by the cell constant.
k = G x C is expressed in S / cm even if the units of measurement mS / cm are in common use
(1 S/cm -> 10
3
mS/cm) e µS/cm (1 S/cm -> 10
6
µS/cm)
•
Setup for Conductivity parameter
•
In measure mode press button
to access the SETUP menu.
•
Use the directional keys to move to
COND SETTINGS P3.0
and access the menu by pressing the key
.
•
Move with the keys
and
to select the program to access.
The table below shows the setup menu structure for the COND parameter; for each program, there are the
options that the user can choose and the default value:
Program
Description
Options
Factory Default
Settings
P3.1
CELL CONSTANT
0.1
- 1 - 10
1
P3.2
CALIBRATION METHOD
AUTOMATIC / CUSTOM
AUTOMATIC
P3.3
REFERENCE TEMPERATURE
15 … 30 °C
25 °C
P3.4
TEMP COMPENSATION FACTOR
0.00 … 10.00 %/°C
1.91 %/°C
P3.6
CALIBRATION DATA
-
-
P3.7
SET DUE CAL
NO – HOURS - DAYS
NO
P3.8
RESET SETTINGS
YES – NO
NO
