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Sensor leads
Sensor terminal diagram
Sensors are always connected across the relevant sensor terminal (
S1 – S6
) and sensor earth (
GND
).
There is an earth strip in the base. A connection to the GND terminal must be laid using this strip be
-
fore the sensors are connected.
In order to prevent measurement fluctuations and ensure perfect signal transmission, sensor leads
must not be subject to external negative influences through 230 V cables.
Never run sensor leads together with mains voltage cables in the same conduit.
When using non-screened cables, route sensor leads and 230 V cables either in separate cable con
-
duits or with a
minimum
distance
of
5
cm
.
If screened cables are used, the screen must be connected to the sensor earth (GND).
All sensor leads with a cross-section of 0.5 mm2 can be extended to up to 50 meters. With this lead
length and a PT1000 temperature sensor, the measuring error is approxi1 K. A correspond
-
ingly larger cross-section is required for longer leads or a lesser measuring error.
The connection between the sensor and the extension can be made by pushing heat shrink tubing
(trimmed to 4 cm) over one core and twisting the
bare
wire ends.
Solder
the connection if one of the
wire ends has been
tin-plated
.
Then push the heat shrink tubing over the connection and heat up carefully (e.g. with a lighter) until
it sits tightly over the connection.
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