Connect The Sensors Electrically To The Controller - ProMinent DULCOMETER diaLog DACb Assembly And Operating Instructions Manual

9.4.7 Connect the sensors electrically to the controller

If possible, use only pre-assembled coaxial cables, which you can select from the product catalogue.
Coaxial cable 0.8 m, pre-assembled.
Coaxial cable 2 m-SN6, pre-assembled.
Coaxial cable 5 m-SN6, pre-assembled.
9.4.7.1 Connection of pH or ORP sensors via a coaxial cable
Fig. 30: RC protective circuit for the relay contacts
Typical AC current application with an inductive load:
1) Load (e.g. alpha motor-driven pump)
n
2) RC-protective circuit
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– Typical RC protective circuit at 230 V AC:
[0.22µF/X2]
– Capacitor
[100 Ohm / 1 W] (metal oxide (pulse resistant))
– Resistance
3) Relay contact (XR1, XR2, XR3)
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User qualification, electrical installation: electrical technician
Ä Chapter 2.4 'User qualification' on page 16
INFORMATION: This section relates to connection type pH/ORP
via mV, with a coaxial cable directly via the electrical terminal of
the controller.
NOTICE!
Possible incorrect measurement due to poor elec‐
trical contact
Only use this type of connector if you do not wish
to use pre-assembled coaxial cables. Observe the
following with this type of connector:
Remove the black plastic layer from the inner
coaxial cable. There is a black plastic layer on all
types of cable. When doing so, ensure that indi‐
vidual threads of the shielding do not come into
contact with the connector of the inner conductor.
INFORMATION: Depending on the design (2 or 3-channel), the
controller can measure the pH or ORP value once, twice or three
times.
Assembly and installation
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