Adcon Telemetry - OTT Hydromet

- Model A723 addIT Series 4 - Data Logger



The A723 addIT is Adcon's best selling RTU - a very compact yet powerful integrated data logger with a 10mW UHF modem inside. In its robust aluminum case and a wealth of I/Os it is suitable for a large variety of applications, from agriculture to water management, from hydrographics to municipal leak detection.

  • Product highlights: IP-67; Ultra low power design; Cost effective solution if a number of sites are close to each other; 1km radio range
  • Data transmission: Radio communication (432-470MHz), 10mW
  • Sensor interfaces: 6 analog 0 … 1/2,5VDC (3 channels also support 0 … 150mV); 2 pulse counter (2x 30Hz counters); 2 digital I/O (expandable with A553 up to 14 digital I/O's), 40 SDI-12 values

SDI-12 Adapter on-board

You can connect up to 40 SDI-12 sensors to the internal adapter of the A723 Series 4. No external SDI-12 adapter is required. Use a standard 7-pin Binder cable as for all other sensors, plug it in, set the driver in the Gateway - done!

Resolution of A/D Converter

The powerful Renesas CPU of the Series 4 addIT provides true 12-Bit resolution. This reduces the max. error caused by AD conversion from 0.1% to 0.025% Thanks to a highly accurate voltage reference this resolution is available over the full temperature range of the RTU, from -30°C to +70°C.

Stabilized Excitation Power

Ratiometric sensors require a stable excitation power. A723 Series 4 lets you select unregulated battery power, ranging from 5.6V to 7.5V, or stabilized and accurate excitation power from 3.3V to 5.5V

Asynchronous Sampling

While by default all sensors are sampled in the same instant, you can now choose to first sample Port A, then Port B. This is advisable for all sensors that might influence each others readings, eg. because they are sitting in a conductive media like water or wet soil.

Pulse Counter Frequency

Count up to 30 pulses per second. That is of particular importance for high speed rain gauges, such as the new Pluvio from OTT Hydrometry, but also for conventional mechanical water and gas meters, and for electromagnetic flow meters.

30% more Battery Power, 80% more Solar Power

A723 addIT Series 4 comes with an industrial grade NiMH battery that can resist temperatures of up to 70°C (158°F) and offers superior capacity of 2100mAh. In order to get a proper charge into this battery the addIT's panel has 220mA output power at 9.2V.

More Memory for Data and Firmware

Higher resolution, more SDI-12 sensors, and more options to store sensor values have made an increase of memory capacity a must. Thus Series 4 offers 4 times more memory than Series 3.

Firmware Upgrade without opening the case

Support staff will love this feature! The firmware of the RTU can be upgraded without having to open the case. Just connect the standard A720SC serial communications cable (item 200.720.540) into the power port and reflash your CPU.

Same Sensor Connectors as in A733

A723 Series 4 uses the same connectors to plug in sensors and solar panels as are used in the A733 series of RTUs, reducing the number of spare parts you have to keep on stock. This type of connector boards comes with external gaskets to improve the RTUs corrosion resistance.

A723 Series 4 uses a robust aluminum case and sturdy Binder connectors, made in Germany, that have proven to work very well since their introduction in 1998. Power consumption is extremely low, and our postcard sized solar panels are sufficient to run the show.

Connect up to 6 analog sensors from our range of environmental equipment, 2 pulse counters, 2 TTL signals (in or out) and up to 40 SDI-12 sensors. A good installation can yield distances of 1000m and more (3.000ft).

A723 addIT Series 4 is fully compatible to all current Adcon long range devices, A731/A751 addRELAY, A733/A753 addWAVE, and to the Telemetry Gateway and RA440 Remote Wireless Modem. It can thus easily be integrated into existing networks.


A Telemetry Gateway running a firmware version older than 2009 will have to be upgraded in order to support the new features of A723 Series 4!
Please note that A723 Series 4 is not compatible to A720, A730MD and A730SD!


The addITs are particularly popular in agriculture. Optimizing irrigation systems requires the installation of soil moisture sensors in large numbers within limited areas. With several soil moisture sensors attached to only one addIT vital soil data can thus inexpensively be relayed back to base through an existing network of Adcon weather stations.

The internal SDI-12 Adaptor makes the A723 addIT Series 4 even more competitive. Up to 40 additional sensors can be attached, provided they either have a very low power consumption or bring their own battery pack. Imagine this to be e.g. 5 multi-level soil moisture probes, or a big multi-parameter probe for water quality monitoring, which outputs anything from temperature, level, and pH to EC, turbidity and VOC's.

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