A755 addSDI GPRS

Friday, 22 January 2010 14:12

The new A755 addSDI 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.

Applications for A755

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.

Technical Specifications

Technical Specifications - Mechanics
Case	Aluminum, powder coated
Protection type	IP-67
Dimensions & weight	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
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)

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

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

Ordering Information

100.755.010	A755 GSM/GPRS SDI-12
200.733.522	460mA Solar Panel, 9V, 50cm cable with male Binder connector 5-pin
800.000.277	Internal Lithium Battery 14,5Ah
200.720.560	Activation Switch for use with Lithium Batteries

Download information

Data sheet US letter

Data sheet english

Data sheet Australia

RTU's
An overview of most Adcon RTU's

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