sommer logo Partner Portal


+43 5523 55989

| My PDF

Tracer System TQ-F


Mobile discharge measurement system for turbulent rivers with unknow cross-section profile - fluorescence Tracer

The discharge measurement is performed by using the well-established tracer-dilution method and is especially suitable for high volumes of water. The system can be deployed in turbulent rivers, creeks or waters for which data regarding the cross-section profile are not available or unknown. It is used a fluorescent material as tracer. After insertion of a known amount of tracer material two optical fluorescence probes automatically determine the discharge. This way high plausibility and accurate results can be guaranteed. New TQ-COMMANDER V2 software is available! More details


The most recent version of the TQ-Tracer is TQ-V3.

TQ-V3 was launched in November 2023!


Features and advantages of the new TQ-V3

  • Simple, mobile discharge measurement
  • Internal memory, display, USB-C data connection
  • Reliable results even without knowledge and independent of the cross-section profile
  • Suitable for fast-flowing, turbulent waters or where access is limited
  • Applied especially with water amounts of several m³/s
  • Environmentally friendly, harmless for water
  • Discharge values immediately available
  • Easy transmission of measurement data form the sensor to receiving device via Bluetooth
  • Convenient receiving of data on laptop
  • Real-time visualisation of measurement data
  • User-friendly guidance through the measurement by the included software TQ-Commander V3
  • Simultaneous measurement with up to four probes
  • Tracer material: fluorescence (fluorescein or similar)
  • Probe type: optical fluorescence probe
  • Compact and convenient: complete equipment securely packed in two cases


Fields of application

The TQ-Tracer system is especially suitable for fast-flowing, turbulent waters with complex cross sections, for example mountain streams, small brooks, tributaries or even fish passes. Equally the TQ-tracer works very well in shallow rivers where most other instruments fail to get reliable results or cannot be used any more at all.

The TQ is used particularly in hydrometry as well as by consulting engineers, civil engineers, and hydropower plant operators monitoring the discharge, for control measurements or for project evaluations.



The tracer dilution method can be applied for discharge measurement in all waters in which a thorough mixing of the tracer takes place. High turbulences, alternating cross sections and stones promote the mixing process and therefore are helpful. For particularly turbulent waters and very high flow velocities there is a TQ-version available where the sensitive probes are protected with a robust reinforcement. The user-friendly software TQ-Commander V3 leads comfortably through the measurement and provides a full measuring report after the measurement.


Technical details TQ-F


  • Measuring principle tracer dilution method with instantaneous feed
  • Application all discharge volumes

TQ-Amp V3 (measurement device with Bluetooth-transmission)

  • Memory capacity 8MB (data storage in the receiving device)
  • Transmission interval 1 second
  • Data transfer Bluetooth class 1 (transmission range up to 100m) , USB-C
  • Operating temperature -20 ... +60 °C
  • Protection IP66
  • Energy supply 4x 1.5 V batteries, size AA or 4x 1.5 V / 2500 mAh NiMH batteries, size AA
  • Operation time 25 hrs (with 4x 2500 mAh batteries)
  • Recharging time approx. 10 hrs


  • Probe type fluorescence probe
  • Measurement range Fluorescein/Rhodamine: 0 ... 50 μg/l (ppb)
  • Resolution 0.05 μg/l (ppb)
  • Operating temperature 0 ... +50 °C
  • (Further types of probes for different tracer substances available upon request.)

Accessories included

  • Pipette 500 μl
  • Jars bottle for calibration solution, measuring cup stainless steel 1000 ml, measuring cup 500 ml, volumetric flask 500 ml
  • Others USB memory stick (software and documentation), USB Bluetooth adapter, chargeing cable USB-C, protection- and weighting armour
  • TQ-Commander (software) PC-Version Windows10 up to 11

Additional Info

  • Characteristics: mobile measuring system
  • Features: contacting measurement

Download attachments: