JDC Electronic SA EasyFlow User Manual
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MADD
Technologies sàrl
Tel: +41 24 445 31 16 – Fax: +41 24 445 21 23 – Email: info@madd.ch – www.madd.ch
– Avenue des Sports 42 – CH-1400 Yverdon-les-Bains – Switzerland
Contents
Contents ..................................................................................................................... 3
Warranty ..................................................................................................................... 3
Gauging method by tracer dilution ................................................................................. 4
Principle .................................................................................................................. 4
Cooking salt as tracer .............................................................................................. 4
Presentation of the device ............................................................................................ 5
General information .................................................................................................. 5
Technical characteristics .......................................................................................... 5
Switch on the device................................................................................................. 5
Functions of the buttons .......................................................................................... 6
Main menu ............................................................................................................... 6
Replacing the batteries ............................................................................................. 6
Multimetre mode ...................................................................................................... 7
Visualisation of the last measurement........................................................................ 7
Calibration of the probe ................................................................................................ 8
Cleaning of the probe ................................................................................................ 8
Preparing the calibration ........................................................................................... 8
Calibration ............................................................................................................... 8
2
Data acquisition on site .............................................................................................. 10
Before starting the acquisition ................................................................................ 10
Quantity of injected salt .......................................................................................... 10
Measuring interval .................................................................................................. 10
Beginning of the acquisition ..................................................................................... 10
End of data acquisition ............................................................................................ 11
Display of the results ............................................................................................. 11
End of acquisition due to errors ............................................................................... 11
Software EasyViewer .................................................................................................. 12
Description ............................................................................................................ 12
Installation ............................................................................................................. 12
Data transfer to PC ............................................................................................... 13
Practical tips ............................................................................................................. 14
MADD
Technologies sàrl
Tel: +41 24 445 31 16 – Fax: +41 24 445 21 23 – Email: info@madd.ch – www.madd.ch
– Avenue des Sports 42 – CH-1400 Yverdon-les-Bains – Switzerland
3
CCoonntteennttss
At the delivery of a device EasyFlow, the package contains the following staff:
• A bag with shoulder strap
• Device EasyFlow with probe and 3 alkaline batteries 1,5V
• 3 calibration doses of 20 millilitres
• A CD "EasyFlow" contening:
o The software EasyViewer
o The instruction manual of the device EasyFlow
o An application note about the gauging method by tracer integration
o A demo video of a gauging with the device SalinoMADD
• A serial cable for the communication between EasyFlow and a PC
• A plastified quick start guide
The device is delivered ready to use and calibrated.
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The device is delivered with a factory warranty for one year from the date of the invoice. Repairs are made in our
workshop; no further benefit can be taken into account without written confirmation of MADD
is understood that this warranty is available only if the device EasyFlow was used in conditions for which it was
expected, as described below. Any other manipulation should be done at risk and peril of the user.
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MADD
Technologies sàrl
Tel: +41 24 445 31 16 – Fax: +41 24 445 21 23 – Email: info@madd.ch – www.madd.ch
– Avenue des Sports 42 – CH-1400 Yverdon-les-Bains – Switzerland
4
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The device EasyFlow uses the tracer dilution method to determine the stream flow of the measured
watercourse.
Principle
The main principle of this method consists to inject into a watercourse a concentrated solution of tracer.
Downstream, at a distance large enough from the injection point for a good mix with the river water, the tracer
concentration is measured during the passage of the tracer could. This dilution is a function of flow rate,
assumed constant along the section concerned during the measurement time.
The following conditions are necessary for the application of the dilution method:
• The flow of the river should remain roughly constant during the measurement;
• The tracer must pass totally through the gauging sector;
• At the measuring point, the mixture should be such that at each point of the section of the river must
spend the same amount of tracer.
According to the above conditions, this method is especially adapted in case of low depths, very high speed or in
presence of turbulences that does not guarantee a stable speed, like rivers or streams. As against, it is not
suitable for measuring flow in concrete channels which does not permit the mixing of the water.
Cooking salt as tracer
The cooking salt, sodium chloride (NaCl), is an ideal tracer: it is very easy to find, cheap and has a high degree of
dilution in water. Furthermore, it is not harmful to the fauna and flora at the concentrations used and it is few
absorbed by vegetation and materials of the bed of the river. Finally, it is very easy to measure its concentration
with a conductivity probe.
M
In this case, the operator injects into the river a known mass of salt
Downstream, is placed a conductivity probe that will measure the electrical conductivity of water throughout
T
the duration
dissolved salt concentration. The concentration curve can therefore be deduced in function of time
Q
is then obtained by integrating the concentration over time:
of passage of the cloud of salt. A linear relationship exists between the conductivity of water and
Q
: flow of the water course [l/s]
M
: mass of the injected tracer [mg]
C
: water salinity at time t [mg/l]
t
C
: basic water salinity [mg/l]
0
T
: duration of gauging [s]
diluted in a volume of water of the river.
C
. The flow
t
MADD
Technologies sàrl
Tel: +41 24 445 31 16 – Fax: +41 24 445 21 23 – Email: info@madd.ch – www.madd.ch
– Avenue des Sports 42 – CH-1400 Yverdon-les-Bains – Switzerland
5
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General information
The device EasyFlow is delivered in a very useful carrying bag with shoulder strap, so it can be taken away on the
field in best conditions. It is recommended to replace the device and the probe in the bag after its use; this will
guaranty its protection. Although it has been designed to withstand rough working conditions, it is a high
precision instrument which should be protected from shocks. Used with a minimal of care your EasyFlow will be
reliable and long lasting work tool.
Technical characteristics
Device
Gauging range 0,1 l/s to 99'900 l/s
Gauging accuracy < 5 % (with optimum mix of tracer)
Gauging repeatability
Tracer type Cooking salt (NaCl)
Tracer quantity 10 g to 100 kg of salt
Tracer ideal mix Between 5 and 20 g of salt per l/s of estimated flow. (Ex : ~300 l/s -> 2 kg)
Supply 3 x 1,5V alkaline batteries, AA, LR6 type
Autonomy About 100 hours under normal conditions
Communication Serial link RS-232
Dimensions / weight Complete bag : 260 x 190 x 130 mm / 1240 g
Waterproof IP65
Salinity
Measuring range 0 to 3200 mg/l
Sensitivity 1 mg/l
Precision < 1 %
Temperature
Measuring range 0 to +40 °C
Precision
± 1%
Device with probe : 230 x 150 x 80 mm / 620 g
± 0,2 °C
Switch on the device
When pressing the ON/SELECT button the EasyFlow is switched on and this display
(on the right) appears after 2 seconds. It contains the version of the device and
actual batteries tension.
If this tension is under 3.3V this message appears and the batteries should be
replaced. Press ENTER to continue.
If the tension is under 3V, this message is shown during 5 seconds, then the device
shutdown. It is here necessary to change the batteries before working with the
EasyFlow. (See previous chapter)
MADD
Technologies sàrl
Tel: +41 24 445 31 16 – Fax: +41 24 445 21 23 – Email: info@madd.ch – www.madd.ch
– Avenue des Sports 42 – CH-1400 Yverdon-les-Bains – Switzerland
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