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The new A755 addSDI GSM/GPRS RTU is tailor made to work with the broad range of SDI-12 sensors. Through its single IP67 connector it supports up to 40 SDI-12 values. It also features one pulse input, which lets you connect any device with a reed switch output, like a water meter or an (irrigation) rain gauge.
Which applications have we built the A753 RTU for?
Here are a few examples:
Soil moisture monitoring:
Depending on the power consumption of your SDI-12 soil moisture sensor you can connect one, two, three or even four SDI-12 soil moisture sensors AND a water meter or irrigation gauge to check the proper flow and distribution of water. Which makes this RTU the perfect choice for irrigators!
Water quality monitoring:
Most multi-parameter water quality probes available today rely on SDI-12 as their interface of choice. Many such probes even come with their own internal battery pack, so power consumption is not an issue. For some probes we recommend the use of our A917 Power Booster interface to get to the required levels of supply voltage.
Water level monitoring - flood warning
Radar sensors are increasingly popular with civil protection agencies as they can easily be mounted on existing structures like bridges, thus reducing the cost of installation. One of the best selling products in this regard is the RLS radar sensor from OTT Germany, for which we have developed a little power booster interface to provide sufficient voltage from the RTUs internal battery.
Ordering Information:
| 100.755.010 |
A755 addSDI GSM/GPRS |
| 200.733.522 |
460mA Solar Panel, 9V, 50cm cable with male Binder connector 5-pin |
| Technical Specifications - Mechanics |
| Case |
Aluminum, powder coated |
| Protection type |
IP-67 |
Dimensions
& weight
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160 x 60 x 80 mm
(6.3 x 2.4 x 3.1 inch)
1200g (2.5 lb) |
| Connectors for sensors and power |
Made in Germany by Binder
IP-67 protection class
Sockets: brass, nickel plated
Socket contacts: gold plated
Protective caps
1 x M9 female 7-pin
1 x M9 female 5-pin
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| Antenna connector |
TNC with external seal, water tight , Made in Germany |
| Mounting |
Mast mounting bracket |
| Operating temperature |
-20°C - +70°C |
| |
| Technical Specifications - Logger |
| Input Channels |
41 total |
| Digital |
40 x SDI-12 values |
| Counter Inputs |
1 x for standard reed switches; electronical signal debouncing, e.g. for rain gauges; max. pulses per second: 30 |
| Sensor Power Supply |
unregulated battery voltage 5.6V ... 7.5V |
| Memory |
2MB for up to 500.000 readings (depending on types of sensors attached) |
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| Technical Specifications - Data Transmission |
| Frequency range |
900 & 1800 MHz (Europe) and
850 & 1900 MHz (Americas) |
| Modem |
Motorola G24L |
| SIM Card |
small footprint |
| Security |
SIM cards are PIN code protected! |
| Connection types |
GSM: CSD Circuit Switched Data
GPRS |
| GPRS Connect Frequency |
User selectable:
- permanent connection
- connect
from 1 x per minute to 1 x per day |
| Antenna |
Omni directional, quad band, 2dBi |
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| Technical Specifications - General |
| Power Supply |
internal 6.2V battery, charged by solar panel or mains adaptor |
| Battery type |
Panasonic High-Temperature Industrial Grade NiMH battery, 3100mAh |
| Approvals |
FCC Part 15, R&TTE, CE,
Industry Canada, ACMA Australia |
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Radio Telemetry Units 
