SmartObserver Datalogger

Product Highlights
  • Versatile communication interfaces support various sensors
  • Multiple communication protocols supported: Modbus, CAN, ASCII, and more available on request
  • Analog inputs and outputs support older-generation sensors
  • Compact, robust, low-power design for field operation
  • Integrated battery charger supports different battery types
  • Digitally controlled power management system
  • MPPT integrated control for plug-and-play solar and wind generator integration
  • Remote system power monitoring and configuration
Product Description
The Geolux SmartObserver data logger is a highly-integrated device used to read the data from attached instruments and deliver this data to Geolux HydroView, a cloud-based data management software. SmartObserver uses a GPRS connection for sending the data to the server, with other communication options such as LoRaWAN available on demand.
The data logger contains internal Flash memory which is used to provide a data storage backup in the case that wireless communication is disabled. Data stored inside the internal Flash memory can be read by connecting the data logger to a PC through an RS-232 interface.
Integrated power management is an important feature of SmartObserver data logger. The integrated battery charger allows users to connect the data logger directly to a solar panel or small wind turbine and to the battery; the SmartObserver will take care of managing battery charging, thus eliminating the need to purchase and install a separate battery charger. SmartObserver supports different battery types, such as lead-acid, NiMH, NiCd, LiFePO4 and Li+.
SmartObserver data logger uses several data interfaces to communicate with the attached instruments. The primary interface is MODBUS, and the data logger supports two MODBUS lines. The data logger also contains two CAN bus lines, an SDI-12 bus, and analog 4-20 mA interface.
All instruments within the monitoring station can be connected to the power supply through SmartObserver data logger. SmartObserver contains two output power lines to power the instruments, and the data logger shuts down these two power lines between periodic measurements in order to reduce battery power consumption. Additionally, the secondary output power line can be configured to conditionally power up, to further reduce power consumption – for example, it may make sense to disable some instruments under certain conditions, such as disabling surface velocity radars when the level meter detects that the river bed is dry.
Detailed Specifications


Wireless Communication
GPRS, LoRaWAN, WiFi or RF modem
(other available on request)
Sensor Interfaces
2x RS-232, 2x RS-485 (Modbus)
2x CAN2.0, 1x SDI-12
2x voltage input (0-10 V)
1x current input (4-20 mA)
Analog Output
1x voltage output (0-5 V)
Digital IO
2x GP inputs, 2x GP outputs
System Monitoring
Voltage and current measurements for Input, Battery and System
Sensors Power Control
2x SSR current-limited 2.0A controlled power outputs


Temperature Range
-40°C to +85°C
Enclosure Dimensions
161 mm x 97 mm x 20 mm
Enclosure Material
Machined aluminum, anodized


Battery Charger Type
MPPT digitally controlled multi-chemistry high efficiency charger with Buck & Boost mode support
Battery Chemistry
Li+, LiFePO4, NiCd, NiMH, Lead Acid
Battery Configuration
1S to 4S
Input Power Generator
Solar, Wind, DC mains
Input Voltage
3 V to 26 V
Input Current Limit
3,6 A for 65 W
Battery Voltage
0 to 19,2 V
Standby Power
< 10 mA
Operating Power
< 100 mA
Mechanical Drawing