Discharge - tracer (Sommer MFT-2)

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Parameter to be measured:

tracer concentration (, discharge)


in-situ fluorometry


  • main device (built-in battery and logger)
  • 2 optical probes with 20-m-fibre cables
  • precision pipette
  • auxiliary bottles and ropes
  • power supply
  • data cable and software


  • no water samples to take, complete data collection on-site
  • convenient menu-guided in-situ calibration
  • immediate computation of discharge
  • can be equipped with alternative filters (not included) to allow detection of other tracers
  • also available with two additional conductivity probes (MKT-2)
  • sturdy metal transport cases


  • bulky, minimum setup comprises two large cases
  • incomplete manual (How can the clock be set? What exactly does "RAM for 10000 measurements" mean?)
  • small internal memory
  • awkward software in vintage look and feel
  • needs RS 232 (COM-Port) for data download

What to watch out for:

  • signal intensity over 2394 (corresponding to concentrations above 310,5 µg/L in de-ionized water) do not yield a linear response any more (oversaturation). Concentrations in de-ionized water above 333,5 µg/L are displayed and logged as 2464. However, these detection limits seem to be lower by factor 3 in natural water (J.B.)
  • memory runs as ring buffer and overwrites without asking
  • included pipette works with two "pressure points"
  • when erasing of logger memory fails or logger readout takes hours, replacing the internal Li-battery and RAM chip may help (soldering skills required)
  • avoid uninformed spectators when injecting the tracer, it usually looks quite nasty



~ 24000 € (2009, Germany)


Product website

Projects that used the above equipment:

Other related web sites: Discharge - comparison of measurements (C2, Flowtracker, Flowsens, ADC, tracer, dipping rod)


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