Excellent suitable for data recording during pumping tests. In addition to the continuous water level measurement in the well, the GPRS Datalogger type 255-G also has a tailor-made input channel to connect a Water Meter or Flow Meter to record the discharge continuously. If required, the device can also take over the additional recording of water quality parameters.

Designed for tough field use during pumping tests, you will quickly appreciate the benefits of the device. The robust and waterproof aluminum housing is easy to handle, the measuring probe(s) and the connection for the Flow Meter can be connected and disconnected by a watertight plug connection. The integrated battery casing made of stainless steel is waterproof and easily accessible for a battery change.

With the GPRS Datalogger type 255-G you have the possibility to monitor the pumping test from the office or at home. Online, you have access to up-to-date water level and flow data and instantly detect any irregularities. In addition, the device can be equipped with an alarm management, which alerts you when you reach limits directly on your smartphone.

Technical Data

General data


200 x 100 x 70 mm


Anodized aluminum, stainless steel


non-volatile flash memory for approx. 190,000 data sets (depending on parameter);

Measuring interval

Adjustable: 1 minute to 99 days / Optional: from 1 second

Wall mounting

Easy to fix via bracket;

Power supply

3 pieces Alkaline batteries, Size: C;
sufficient for 2 years at daily data transmission or about 30 days at hourly data transmission;

User interface

RS 232; can be addressed via serial and USB interface

Connection Sensors

Input channels

- RS485 Modbus for HT probes

- Input channel for connection of flow meter

Connection type:

Via waterproof plug connection

Data Transmission

Transmission frequency

Dualband 900 / 1800 MHz- Optional: Quadband with 850/1900 MHz

Cellular network

Standard: 2G / Optional: 3G

Transfer protocol

Standard: FTP, by setting also with SSL encryption

Alarm Management

• 2 limit values can be defined for each parameter

• Possibility to autom. switching of measuring and transmission interval

• Low battery warning

• Warning message via SMS / eMail and status on web server

Environmental conditions

Operating temperature

-20°C to +65°C

Protection class

IP 67


  • Robust construction for tough field use.
  • Waterproof IP67
  • Plug-in probes for universal use
  • Integrated battery casing made of stainless steel
  • Possibility for remote data transmission
  • Easy installation and operation


  • Data recording during pumping tests
  • For flow rate measurement at spring discharges
  • Precipitation measurements
  • Use in underfloor wells / manholes