Rev 3 (XXXX 2019)
NexU INSTALLATION MANUAL
24
Note that the three probes must be set at different heights depending on the type of tank
being monitored (fresh fluid tank or waste fluid tank):
Also, it is possible to use only one or two contact probes: if only one probe is used, it
must be connected to S3 (STOP) input; if only two probes are used, they must be
connected to S2 (WARNING) and S3 (STOP).
NOTE: Analogue and contact probes cannot be used simultaneously into the same tank.
Analog (pressure) probe input:
This input allows connecting an
analogue level probe in order to get in
real time an exact measurement of
the fluid level inside the tank.
Currently, only barometric level probes
Samoa code 382120) are supported.
The probe must be connected as
follows (red to +24V, black to IN,
shield to GND; leaving +12V
disconnected):
NOTE: Analogue and contact probes cannot be used simultaneously into the same tank.
Overfill input/output
This input allows connecting a safety contact probe (float type or equivalent). Only normally-
closed (NC, the electrical contact inside the probe must stay closed when the fluid level is
below the probe) switch-type probes can be used.
This input, together with the overfill valve output, is meant as a safety device to prevent
overfilling the tank. By setting the overfill probe at the maximum allowed fluid level inside the
tank (full tank level), it stops the fluid from entering the tank as soon as the overfill level
probe is reached.
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