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The A753 GSM / GPRS RTU is a completely new design that surpasses its predecessor, the A733 GRPS, in every aspect. We have tried to build an RTU that can be used for a huge variety of applications, from basic to professional meteorology, from hydrographics to meter reading, from wind and solar power site assessments to rain intensity monitoring.
What's new in A753?
Which applications have we built the A753 RTU for?
Here are a few examples:
Agricultural Weather stations:
Just like its predecessor the A753 makes an excellent ag met station: very easy to install, setup and maintain, and fully back-wards compatible - yet expandable to an unheard of extent!
Professional Weather Stations:
Professional meteorologists want the best of it all. They want high resolution, WMO compliant measuring methods, particularly when it comes to wind speed and direction, flexibility to host many different sensors - and if that comes in a compact package at reasonable prices it doesn't hurt either! A753 can do all that and more
The Environmental Monitor: Water and Air quality
Most modern multi-parameter sensors for water and air quality come with a digital SDI-12 interface to increase accuracy and compatibility. A753 allows the operation of up to 40 SDI-12 values without any additional adapters. And for accurate analog sensors it features 12 0-2,5V inputs with 16-bit resolution.
The Rain Intensity Station:
In many countries rain intensity monitoring requires the stations capability to store date and time of every single pulse that occurs. Lots of data! The A753 can not only do that - it can furthermore store the wind speed and wind direction at the time of the pulse!
Ordering Information:
| 100.753.010 |
A753 addWAVE 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
4 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 - +75°C |
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| Technical Specifications - Logger |
| Input Channels |
60 total |
| Analog Inputs |
12 x 0 - 1V / 2.5V DC
( 3 of these inputs can be configured
for a range of 0 - 150mV
DC low temp.drift) |
| Digital Inputs |
40 x SDI-12 values |
| Counter Inputs |
2 + 2
I/O A + I/O D: for standard reed switches; electronical signal debouncing, e.g. for rain gauges; max. pulses per second: 30
I/O B + I/O C: for hi-speed
pulses, e.g. wind speed sensors or flow meters; max. pulses per second: 500 |
| TTL Inputs / Outputs |
4 x TTL compatible status ports (input) or Switch (output) , user selectable
(2 of which with 5V, 2 with 3.3V)
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Resolution on analog ports
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16-Bit |
| Sensor Power Supply |
User selectable:
- Unregulated battery Voltage 5.5V - 7.5V
- Stabilized Voltage: setable from 3.3V-7.5V |
| Memory |
2MB for up to 500.000 readings (depending on types of sensors attached) Example: ETo station, 15-minute values: >6 months |
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| Special Logger Functions - Configurable |
| Wind Gust Monitoring |
Port C + Adcon Wind Sensor:
4 x samples per second, 3-second average;
Date/Time of top speed stored |
| Wind Vector Monitoring |
Port C + Adcon Wind Sensor:
Direction is measured at time of speed reading; direction is weighed by speed and stored as vector |
| Rain Intensity Monitoring |
Port D + Pulse Rain Gauge
(max. resolution is 1 second)
Date / Time of every single pulse stored; if required up to 3 additional analog values and 2 counters can be stored, e.g. wind speed & direction plus temperature |
| Pressure Hammer Detection |
Port C + Adcon Manometer Probe:
permanently powered sensor measures 4 x per second for pressure hammers with a 3-sec. average |
| Low Voltage Amplifier |
Port B: allows usage of sensors with mV output signals to be attached directly |
| Asynchronous sampling |
To reduce interference caused by synchronously sampling all ports they can be turned on and off sequentially |
| Event Monitor |
In order to detect status changes on a digital input the station can sample each digital port with a time resoltuion of 1 second; date and time of every single status change are logged. Application: error monitoring on equipment, intrusion detection, pump operation, etc. |
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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 |
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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, R&TTE, CE, Industry Canada, Radio Australia |
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Radio Telemetry Units 
