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CHAPTER 3
Maintaining and servicing the RTU
17
be fully charged after two consecutive sunny days, but you
should get an LED light-up after several minutes of charging
in the sunlight.
Configuring an addIT RTU in the addVANTAGE software
If you’re using an addIT RTU with an A730 system, you can config-
ure the RTU by following the steps described in the
addVANTAGE
A730 Releases Notes for Version 3.35
or in the
addVANTAGE 3.40
User Manual
. If you’re using the addIT RTU with addVANTAGE
Lite, follow the steps described in the addVANTAGE 4.1 Lite Refer-
ence Manual.
Maintaining and servicing the RTU
The A720 and A723 units need virtually no maintenance. They are
waterproof and designed to withstand harsh environmental condi-
tions (-30 to +70 °C, or -22 to 158 °F), high RH values, water, and
other noncorrosive liquids. They conform to the European protec-
tion class IP65. This applies also to the connectors, as long as they
are mated. Don’t let unmated connectors on either the addIT RTU
or the sensors be exposed to the environment for extended peri-
ods of time.
The RTU battery
Note: The same type of battery is used in the A720/A723 and
A720B devices, so the information in this section also
applies to the A720B.
The internal battery supplies 6.2 volts and consists of a NiCd pack.
The internal electronics manage the battery charging/discharging
process, ensuring it a long life. This approach, coupled with a
remarkably low average consumption (some mere 6 mW), allows
an addIT RTU to operate at least one month on a fully charged
battery, with the following conditions:
• The channel has moderate radio activity, with requests every
15 minutes.
•Total consumption of attached sensors is no more than 50
mA.
• The sensors are sampled once every 5 minutes and an
averaged slot is stored in the internal memory every 15
minutes.