Usage: tracing experiments in 2" boreholes tested to depths of 70 metres.  No mechanical parts, no wear. Can be used as well with quick-connect fittings and 6 mm tubings. Model FL24 has quadruple excitation and detection axes, allowing simultaneous use of three tracers and independent turbidity measurement. 

The sonde connects with a 4-wire signal cable to a waterproof box hosting a datalogger and 1 or 2 batteries. The datalogger provides power, timing, clock and data storage capability. The signal is transmitted in digital form. The box can connect to any PC through the RS232 interface. For unattended work, the datalogger stores as many as 4 x 60,000 samples and water temperature (0.01°C accuracy) on a Compact Flash card.

A recent datalogger version features following advantages: LCD display on 2x16 characters, USB interface instead of RS232, microSD card instead of CF, and optional GPRS modem for remote data access through the web.

Click here for comparing dataloggers.

The surface sonde (FL30) is preferred for its better stability in turbidity measurement and ease of use if the diameter is not a concern.

 See available dye tracers