Tech Controllers EU-L-12 User Manual page 7

Mounting electrolytic capacitors
In order to reduce the phenomenon of fluctuation in the temperature read from the zone sensor, use a 220uF / 25V low
impedance electrolytic capacitor connected parallel to the sensor cable. When installing a capacitor, pay special attention to
polarization. The ground of the element marked with a white stripe should be screwed into the right-hand side terminal of
the sensor connector (looking at it from the front of the controller), which can be seen in the attached photographs. The
second terminal of the capacitor should be screwed into the left-hand side terminal of the connector. So far the application
of this solution has eliminated completely the occurring disturbances. It is worth noting, however, that the basic principle is
proper connection of wires to avoid disruption. The cable should not be placed close to the sources of the electromagnetic
field, but if this is the case, it is necessary to use a filter in the form of a capacitor.
220uF/25V low impedance
electrolytic capacitor
Pictorial diagram presenting wiring and communication with other devices in the system:
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