02.A.003 23
8.2. Connection of the signal cable to the sensor
The values of the signals transmitted from the electrode system of the sensor to
the flow meter are at the level of millivolts. These signals are extremely sensitive
to magnetic and electrostatic disturbances which are generated by the adjacent
high-voltage cables, energy cables or power supply lines feeding the high power
electrical devices. The disturbances are compensated by the internal noise filter
of the flow meter, however, if it is possible to eliminate the unwanted sources of
signals it should be applied. For the PEM-1000NW flow meters it is
recommended to place the signal cable from the sensor in separate cable
channels.
The signal cable extending from the sensor is of special design and constitutes
the part of the order, hence its length should not be altered (in case of a certified
device it must not be changed).
The outer sheath (insulation) of the cable should remain intact along its entire
length.
The cable conductors of the sensor must be connected to the plug in accordance with
the table and the figures.
The incorrect connection of the cable conductors to the plug of the converter will
cause a lot of measurement irregularities.
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