The instrument is battery-operated (12V), thus allowing it to be set up according to model and
sensor equipment at site without any mains supply for some hours or even days (applies not for
sensors measured by the Sensor-Interface). The exchangeable storage battery is situated in the
data logger case. With an optional 12V solar panel it is possible to load the battery.
Additionally a mains power supply (230VAC) can be used, which also supplies (24VAC) the heating
of sensors and the Sensor-Interface (apply only for 9.1756.x0.
1
00). In this case the battery serves
for bridging in case of power failure. The following figure shows the supply possibilities.
Figure 4: Block diagram supply
In order to protect the accumulator against discharging the measurement of the sensors is
interrupted in case the voltage is below 10,5 V (thus the current consumption is minimized). Then,
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