Hydro Logger H1
User manual
FIEDLER
electronics for ecology
29
4.4.2.
Power supply for connected sensors and transducers
In addition to the input terminals for connecting the measured signals, the
Hydro Logger H1 also has 2 types of power terminals for powering the connec-
ted sensors and probes.
On the terminals Unap (terminals 3, 6, 10) the supply voltage is present
only during the measurement of signals from the connected sensors. The mea-
surement interval is an adjustable parameter ranging from 1 minute to 24 hours.
Another adjustable parameter of the unit allows to switch on this power supply
in advance of the actual measurement, so that the connected sensors have time
to start up and correctly adjust the size of the output signal in proportion to the
physical quantity being monitored.
The supply voltage at the Unap terminals is user adjustable from +6 V to +15 V.
The choice of the supply voltage magnitude is determined by the user when
parameterizing the instrument and depends on the type of sensors and measu-
ring probes connected. For sensors and probes connected via RS-485, the lower
voltage value is usually set near +6 V and for pressure or level sensors with a 4-
20 mA output signal, the higher voltage value is u15 V.
The required supply voltage is generated by the integrated DC/DC converter in
the instrument from the battery voltage. A lower supply voltage value extends
the life of the power battery.
Some sensors require a continuous uninterrupted power supply. Examples inc-
lude OPTO sensors used for pulse sensing from propeller water meters. The
Uopto terminals (terminals 15 and 18) are designed to supply power to such
sensors, and a 3.6V battery voltage can be permanently present. This voltage
must be permanently switched on when parameterizing the instrument.
Permanently powered sensors must not overload the battery in the station and
therefore their current consumption should not exceed 200
µA
. For example,
OPTO sensors type VLP-8 to VLP-11 are suitable, which draw 80
µA
from the
+Uopto terminal.
P o w e r t e r m i n a l
+ U n a p
P o w e r c l a m p
+ U o p t o
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