An affordable, low maintenance, battery/solar powered SMS flood alarm system designed to deliver a single or dual level warning concerning rising river or groundwater levels over the 2G SMS text network.
Designed for rapid, self-installation, with no complex software or programming, the system can be supplied housed in a variety of housings, including custom fabricated staff gauges, fibreglass stilling tubes, or aluminium streetlamp column bases.
The system utilises Radio Data Networks unique BDT (Bulk Dielectric Transducer) level transducers for detecting when the water is level exceeding the pre-set limit/s. The BDT has significant advantages over ultrasonic, pressure and float switch technolgy, as it can detect and report issues associated with silt, ice and weed that can lead to the failure of the other technologies. Further, the BDT has a proven track record in the utility sector where they have collectively accumulated over 5 billion hours of service, since they were first introduced in 2010.
The system is ultra-low power in operation, consuming in standby just a few microamps. This makes it possible for us to supply a system with up to 10-years’ service life on a single battery pack.
Alternatively, the system can be supplied with solar assistance / rechargeable lithium technolgy which can extend the battery life further or allow for the more frequent reporting of levels.
The systems are designed to automatically report typically twice daily, thereby instilling the confidence in flood wardens and the community that the system will work when needed.
Contained within this message is the overall pass / fail of the “System Test”, the status of the Battery High or Low, the state of the solar charger Off or Charging (where applicable), and two engineering values associated with the two BDT Level sensors and an incrementing message number.
With solar powered systems, normally, during the day (depending upon the position of the sun and weather) the solar charger in on and Charging and at night the solar charger is off.
When the water level reaches midway up the tip of BDT level sensor, the level change is detected and wakes the unit from sleep and an alarm message is compiled and broadcast.
To ensure that the staff are responsive, the alarm is resent every 5-minutes whilst the flood condition exists.
In the example below this is for a dual BDT level system with a two transducers placed above each other to give a high and high-high level warning.
With its long battery life, and the use of BDT sensors which have no moving parts, regular maintenance is not required.
We do however recommend periodic inspection of the installation conducted to ensure that reeds, weeds will not impede the flow of water into the point of sensing.
The fault message, as below is generated if the unit finds a defect with one of the BDT level sensors or one of the cables is cut or damaged. This is an important function as cables can become damaged by rodents or excessive use of brush cutters when clearing reeds.