7.3.2 Terminal diagram
The controller is supplied with terminal diagrams showing 1:1 assignment.
Only one sensor per unit
You can connect 2 sensors to the base module and 1 sensor to the extension unit. For
example, you can connect a chlorine sensor and an ORP sensor to the base module and a
pH sensor or an interference variable to the extension unit.
Connection of the chlorine sensor with controllers with two channels
Note the following when connecting the sensors when measuring chlorine with pH compen‐
sation. Connect the chlorine sensor on the extension unit (Channel 2) to the terminals as per
the terminal diagram.
Connect the pH sensor on the main unit (Channel 1) as follows:
–
When using a coaxial cable on the shield terminal and on the internal conductor, as per
the terminal diagram.
–
When using a transmitter pHV1 (mA) on the terminals, as per the terminal diagram.
The pH value also needs to be temperature-compensated to ensure correct pH compensa‐
tion. Therefore, connect the temperature sensor to the terminals as per the terminal dia‐
gram.
Depending on the identity code of the controller (Channel 2 = Package 4), now connect the
interference variable to the mA input of the extension unit, as per the terminal diagram, if this
mA input is not already occupied by the transmitter pHV1 (mA).
The interference variable influences 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
41
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