1. Autonomous Remote Sensing of Water Level and Waves
The LOG_aLevel® - System
Based on Revolutionary Ultrasonic Technology

2. LOG_aLevel® - The Ultrasound-Sensor
The Innovation:
Fast, precise and remote
detection of waves and water levels
Sensor characteristics
Narrow sound beam of 3° ensures small footprint on water surface
Free of disturbing minor sound beams
Extraordinary high transmitting power and receiving sensitivity
Technical resolution: 1 mm
Accuracy in field operation: 1 cm
Easy installation at any place
jetties, wharfs, sluices, embankment
beacons, dolphins, poles, bridges
buildings, platforms, etc.

3. LOG_aLevel® compared to common systems
Common Ultra- sound Sensors or Radar Sensor

4. Modular Construction of the LOG_aLevel
Optional Equipment
Standard Equipment
Telemetry Moduls:
- Radio/GSM/GPRS/ - LAN, Analogue, etc.
Controller Module
RS 232/485 Output
1 GB (2 GB) Data Logger
Ultrasound-Sensor
- AC Power Supply
- Wind Generator
- Solar Panel
- Buffer-Battery
Sound velocity gauging
with additional Sensor
12 V DC
Power Supply Module
External Sensors
- Wind, Pressure,
- Radar, Weather, etc.
Stainless steel housing
PPS Timing Modul (integrated in Controller)
LOG_aLevel Software
4 Digit Display Modul

5. LOG_aLevel® in big housing
Modular Construction
Controller
Data Logger
Power Supply 12 V
Power Supply 230 V
GSM/GPRS
80 Ah Buffer Battery

6. LOG_aLevel® in small housing
Modular Construction
Controller
Power Supply 12 V
Power Supply 230 V
Radio Module
7,5 Ah Buffer Battery

7. LOG_aLevel® Reference-Sensor
Sound Velocity measurement due to the possible change of temperature, air pressure and humidity
By using the directly measured ultrasound velocity in air and the measured travel time it is possible to accurately compute the water level due to the continuously calibration.

8. LOG_aLevel® - Applications
Water level monitoring
Wave detection and analysis
Flood and high water prediction
Mobile Working Level
Event Alerting System
Water reservoir management
Environmental monitoring
Complete hydrological and metrological monitoring station

9. Example The Storm-Tide-Network in the Port of Hamburg (Location: Strandkai)

10. Antenna
Example The Storm-Tide-Network in the Port of Hamburg (Location: Nienstedten)
Controller
Ultrasound-
Sensor

11. Storm Tide Network at Port of Hamburg
Nienstedten
Strandkai
Billwerder Sperrwerk
Hamburger Schleuse
Network consists of:
4 LOG_aLevel Stations
Integration of wind sensor
Autonomous power supply (wind and solar)
Remote data transfer via GPRS

12. The LOG_aLevel® - Software for data logging and control
Real-Time visualizing of Water Level and the Wave Parameter (H1/3)

13. Level Data Example 30 sec. Measurement, then 30 min standby
Real-Time Data

14. Summary of the Technical Specifications
Ultrasonic high performance sensor technology:
Measuring distances 6 m, optional up to 10 meters (higher distances on request) Accuracy: 1 cm; Technical Resolution: 1 mm (360 µ m internal) Sampling rate up to 5 Hz (mean values selectable) Sensor weight: 250 grams Operating temperature: of -20 ° C to +70 ° C Measuring modes: continuous, periodic and sleep mode
Remote data transmission and storage:
DFÜ modules: Ethernet, RS232/485, GPRS, Radio, directional radio, etc. Bi-directional communication allows remote maintenance Internal data logger: 1GB (or 2 GB) - PCMCIA card for 6 months continuous data acquisition

15. General Advantages Precise, economical, robust and compact
Always reliable also under extreme conditions: flood, ice, storms, debris, fog, etc.
Accurate level measurements even with wavy surface
Simple and inexpensive installation (LOG_aLevel is also available as a mobile version)
Calibration and maintenance free
Redundancy or alternative to conventional level measurement techniques
Completely autonomous operation possible
Worldwide in operation
Test winner Rijkswaterstaat 2005 against 15 other technologies
Easy to use Windows-Software for data logging and control

16. LOG_aLevel® around the World2 9 16 2 2 3 2 5 2 2
LOG_aLevel is used on all continents in more than 27 countries under all possible environmental conditions

17. LOG_aLevel® Selected References
Rijkswaterstaat: Ministry of Transport + Watermanagement, (RIZA), The Netherlands
Port of Hamburg (Hamburg Port Authority), Germany
US-Army Corps of Engineers San Francisco District (USACE), USA
Project: North Sea Monitoring System: Government Schleswig-Holstein, Germany
Bundesanstalt für Gewässerkunde (BfG), Koblenz (Federal Institute of Hydrology), Germany
National Institute of Ocean technology (NIOT), India
Port of Le Havre (Port Autonome du Havre), France; Port of Seoul, Korea
MRTS, Varanday-Oil and Gas Terminal, Russia
Geofísica y Posicionamiento Satelital GPSCA, Maracaibo Lake, Venezuela
Ecologia, Vouneuil-sur-Vienne, River Vienne, France
Wasser- und Schifffahrtsamt Brandenburg (Waterways and Shipping Board), Germany
Bayer. Landesamt für Wasserwirtschaft (Bavarian Ministry of Environment), Germany
Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB-Berlin), Germany
Agency for Water Management, Coast and Nature Protection of Lower Saxony), NLWKN – Norderney, Germany and NLWKN – Brake, Germany
University of Moscow, Russia, University of Tallinn, Estonia
Port of Adelaide (Flinders Ports), Australia
Proudman Oceanographic Laboratory, United Kingdom
Saudi Aramco, Saudi Arabia