Terminal Diagram - ProMinent DULCOMETER Assembly And Operating Instructions Manual

6.3.2

Terminal diagram

The controller is supplied with terminal diagrams showing 1:1 assignment.
Only one sensor per unit
Only one sensor can be connected to each of the main unit and extension unit. For
example, you can connect a chlorine sensor to the main unit (channel 1) and a pH
sensor or an interference variable to the extension unit (channel 2).
Connecting the chlorine sensor with controllers with two channels
Note the following when connecting the sensors when measuring chlorine with pH
compensation. Connect the chlorine sensor on the extension unit (channel 2) to the
terminals XE8.3 (-) and XE8.4 (+).
Connect the pH sensor on the extension unit (channel 1) as follows:
When using a coaxial cable on terminals XE1 (shield), XE 2 (internal conductor)
–
When using a transmitter pHV1 (mA) on terminals XE4.3 (-) and XE4.4 (+)
–
The pH value also needs to be temperature-compensated to ensure correct pH com‐
pensation. Therefore, connect the temperature sensor to terminals XE7.3 and XE7.4.
Depending on the identity code of the controller (channel 2 = Package 4), now con‐
nect the interference variable on the mA input to the extension unit XE8.2(-) and
XE8.3 (+), if not already occupied by the transmitter pHV1 (mA).
The interference variable influences the pH and chlorine control.
pH measurement using a transmitter
If a pH measurement is connected to the controller via a transmitter
DULCOMETER® DMTa or another manufacturer's pH measuring device, then
assign mA-pH in the DMTa and/or in the other manufacturer's pH measuring device
as follows:[ 4 mA = pH 15.45] and [20 mA = pH -1.45]
Assembly and installation
33