ProMinent DULCOMARIN 3 Compact Assembly And Operating Instructions Manual page 58

Assembly and installation
Switching the controller to a measure‐
ment with potential equalisation
Sensor connection without potential
equalisation
Sensor connection with potential
equalisation
58
When is potential equalisation used?
Use potential equalisation if the pH/ORP measure‐
ment is interfered with by interference potentials
from the sample media. For example interference
potentials may be produced by electric motors with
incorrect interference suppression or due to insuffi‐
cient galvanic insulation of electrical conductors
etc. The potential equalisation does not cancel this
interference potential, it does however reduce its
effect on the measurement. Therefore, ideally the
source of the interference potential should be elim‐
inated.
NOTICE!
Wire jumper with connected potential equalisation
A measurement with a wire jumper and connected
potential equalisation produces incorrect measured
values.
Please note the following differences:
The controller is factory-preset for measurements
without potential equalisation (unsymmetrical
measurement).
For a measurement with potential equalisation
(symmetrical measurement), the setting in the
[Measurement] menu must be changed accord‐
ingly.
With a symmetrical connection, the wire jumper
needs to be removed and the cable for the poten‐
tial equalisation conductor (PA) needs to be con‐
nected to the terminal previously occupied by the
wire jumper.
[Measurement] channel 1 or 2 menu, change the entry
1. In the
[Potential equalisation ] to [Yes] .
under
2. Open the controller and remove the wire jumper.
The sensor is connected to the controller, as marked in the ter‐
minal diagram. Do not remove the wire jumper in the controller.
NOTICE!
Error sources when measuring with potential
equalisation
A measurement without a wire jumper and uncon‐
nected potential equalisation produces incorrect
measured values.