ProMinent DULCOMETER diaLog DACb Assembly And Operating Instructions Manual page 57

Sensor connector with potential
equalisation
Sensor connector without potential
equalisation
Please note the following differences:
The controller is factory-preset for measurements
without potential equalisation (unsymmetrical
measurement).
To perform a measurement with potential equalisa‐
tion (symmetrical measurement), change the set‐
ting in the [Measurement] menu accordingly.
With a symmetrical connection, remove the wire
jumper and connect the potential equalisation con‐
ductor (PA) to the terminal XE3_2 (channel 1) or
XE7_2 (channel 2) of the controller.
[Measurement] channel 1 or 2 menu, change the entry
1. In the
under [Potential equalisation ] to [Yes] .
2. Open the controller and remove the wire jumper.
on module A (measuring input): Terminal XE3_1, XE3_2
n
for channel 1
on module A (measuring input): Terminal XE7_1, XE7_2
n
for channel 2
on module C (extension unit): Terminal XE7_1, XE7_2 for
n
channel 3
NOTICE!
Error sources when measuring with potential
equalisation
A measurement without a wire jumper and/or
unconnected potential equalisation delivers incor‐
rect measured values.
INFORMATION: With a symmetrical connection, connect the line
for potential equalisation to terminal XE3_2 (channel 1) or XE7_2
(channel 2) of the controller. Before doing so, remove the respec‐
tive wire jumper at these terminals.
INFORMATION: The potential equalisation must always be in con‐
tact with the medium being measured. A special potential equalisa‐
tion plug (order no. 791663) and a cable (order no. 818438) are
necessary with the DGMa bypass fitting. The potential equalisation
pin is always fitted with the DLG bypass fitting; only the cable
(order no. 818438) is needed.
Features when calibrating with potential equalisa‐
tion
When calibrating, immerse the potential equalisa‐
tion in the respective buffer solution, or use the cal‐
ibration receptacle which forms part of the scope of
delivery of the bypass fitting. This calibration
receptacle incorporates an integral potential equal‐
isation pin to which you can connect the potential
equalisation cable.
The sensor is connected to the controller, as shown on the terminal
diagram. Do not remove the wire jumper in the controller.
Assembly and installation
57