User's Manual

Compliance Statement and Warnings
supports the SDI-12 bus implementation. The unit is based on a powerful 8 bit
Flash RISC microcontroller, that can also be field programmed (software
upgraded).
The only difference between these devices and the A732 and A731 is the number
of analog and digital interfaces.
The A731, A732 and A733 RTUs incorporate an A431 radio module operating in
the 430 to 470 MHz range, making it adaptable to most radio communication
regulations in the world. The output power is variable up to 0.5 W, while the
modulation is narrow-band FM (6.25, 12.5 or 25 kHz channel spacing). The
A733GSM RTU incorporates a GSM module and uses the standard GSM network
for retrieving telemetry data (900/1800MHz in Europe, 1900MHz in the US).
Due to its construction, as well as to the software controlling it, the power
consumption is extremely low (on average 1 mA without sensors, approx. 3 mA for
the GSM version). The RTUs operate from a built-in NiCd 6.2 Volt rechargeable
battery, which is charged using either a solar panel or an external power adapter. A
special configuration may be implemented where no internal battery is used, rather
the power is obtained exclusively over an external connector.
The A73x is a rugged RTU, complying with the IP65 ingress protection class
(NEMA 4). Depending on topography it ensures a reliable wireless connection to
other A73x RTUs, an A730MD or A730SD device or an A840 Telemetry Gateway
over a distance of up to 20 km (12 miles). The A733GSM has no such limitations,
however, your cellular service provider must cover the site where you want to
install the RTU. The A733GSM operates in conjunction with the A840 Telemetry
Gateway only.
1.2 Compliance Statement and Warnings
The A73x must not be used with any antenna other than the one supplied by
Adcon (or an antenna with identical technical specifications).
A minimum distance of 18cm to the antenna is required in order to guarantee
compliance with basic safety restrictions. In conformity with the EC Parliament
recommendations 1999/519/EG 28V/m is the reference value for the frequency
range used. By adhering to any and all recommended reference levels, the
compliance to basic restrictions serving the protection of the general public against
electromagnetic fields is ensured.
This device is notified in the following countries:
Australia, Austria, Germany, Denmark, Finland, France, Greece, Hungary,
Italy, Ireland, Netherlands, Norway, Poland, Portugal, Spain, Sweden,
Switzerland, United Kingdom, USA
In some countries individual user licences and frequency allocations need to be
applied for. Please consult your dealer for further information.
Note: The above paragraphs are not applicable to the A733GSM RTU.
The A733GSM is available for the European 900MHz and 1800MHz networks as
well as for the 1900MHz infrastructure in the US and several other countries. Using
the equipment in 850MHz networks is not authorized.
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