Sommer GmbH 10
The supplied software TQ-Commander guides the user through the complete measurement procedure,
starting from the calibration through to issuing the measurement report. The necessary steps and
requirements are described in this manual.
5.2. Requirements
The following requirements have to be fulfilled to get good and correct measurement results:
o Constant water flow during the measurement
o Constant base value during the measurement
o Even distribution of the tracer in the whole river cross section (vertical and horizontal) at the position of
the conductivity sensor(s).
o The whole tracer has to pass the sensors completely (no backwater…) meaning that after the tracer
substance passed the sensor the measured value should be very close to the base value (see above
diagram).
5.3. Selection of the measurement location
To ensure a sufficient mixing of the tracer substance the following topographic aspects should be
considered.
Positive:
o Varying cross sections
o High roughness
o Stones and rocks
Negative:
o Backwater areas (pools, rollers, dead water zones …)
o Low turbulence
o High vegetation
Especially consider the following points:
1. Suitable tracer injection site
2. Sufficient mixing distance
3. Appropriate location for placing the conductivity sensors in the river
Ad 1: Tracer input
The goal is to input the complete tracer substance (injection amount) as fast and as completely as
possible in one single impulse (with swift rinsing of tracer remains) into the main stream. There should be
not vegetation present at the injection site.
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