JDC Electronic SA SalinoMADD - Manual (Page 11)

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MADD Technologies sàrl
– Avenue des Sports 42 – CH-1400 Yverdon-les-Bains – Switzerland
Tel: +41 24 445 31 16 – Fax: +41 24 445 21 23 – Email: [email protected] – www.madd.ch
Choice of the meteorological situation
The SalinoMADD contains a number of meteorological situations among which you will choose the appropriate
setting corresponding to the situation at the time of measurement.
Sunny Rainy Snow
Overcast Rain & hail Cloudy
Rain & wind Cold & frost Stormy
Nice & hot Strong rain
Introduction of the water level
Having selected one of above listed meteorological situations, you can
enter the water level of the water course to be gauged. The water
level measured on site permits to correlate measured water flow with
the water level. After a number of measurements at different heights,
it will be possible to establish a formula or at least a relationship
between measured water level and water flow.
Start by selecting the unit in mm, cm or meters before stepping up numbers up to the desired value by pressing
the touch
. The first digit chosen, go on to the next one by pressing touch and so on until the desired
value is complete.
Quantity of injected salt
The next step is the introduction of the salt quantity that will be injected into the water course for the gauging.
The recommended quantity of 2 to 12 grams per litre/second of water flow depends on the distance to the
injection point necessary for a good mixture. The longer the distance, the bigger the tracer dilution and then the
smaller the increase in salinity in the gauging area.
To obtain good results, this instrument requires a salinity increase of
10% or at least 15 milligrams per litre compared with the natural
salinity of the water course.
This quantity of injected salt should be known with precision because it
is an important factor for the water flow calculation.
The SalinoMADD accepts values from 1g to 1000kg.
Distance to point of injection
This distance depends on the nature and the length of the water
course the salt cloud has to travel though until it is evenly spread over
its entire section. The more the water course is turbulent, the faster
mixture and dilution are achieved and the shorter the distance to
point of injection, like in a mountain torrent. In case of a canalized
water course nearly straight or with reservoirs, the flow will be
slower, the distance to point of salt injection will be greater and more
salt will be required.
This distance is recorded for information only since it does not enter into the water flow calculation.
End of data inputs
All necessary data inputs having been recorded in the SalinoMADD,
the acquisition can go on.
The data has been safely stored and the unit will restart and return
to its initial state within a few seconds.
.