Irrigation

How to chooseyour DosatronThe choice of the Dosatron essentially depends on therequired irrigation flow.ExampleSoftware forpreparation of the stock solutionfrom water soluble or liquid fertilizersSoftware for fertigation is available in the form of Excel spreadsheets.Basic principle for preparation of the stock solution(from water soluble fertilizers):1 st sector:3000 2 l/h drippersManualvalvesNonreturnvalve2 nd sector:1000 2 l/h drippersIrrigationwater%Fertigation water orsub-concentration3 rd sector:2000 2 l/h drippers1. Calculation ofthe required irrigation flowMinimum irrigation flow:Multiply the number of drippers (or sprinklers or nozzles)in the smallest sector by their unit flow:1 000 x 2 l/h= 2 000 l/h = 2 m 3 /hMaximum irrigation flow:Multiply the total number of drippers in all sectors bytheir unit flow:3 000 + 1 000 + 2 000= 6 000 x 2 l/h= 12 000 l/h = 12 m 3 /h2. Choice of the DosatronIts minimum flowIts minimum flow capacity must be equal to or lessthan the required irrigation flow in the smallest sector.E.g.: Sector 2: 2 m 3 /hPossibilities:D 45: 100 l/h to 4.5 m 3 /hD 8 R: 500 l/h to 8 m 3 /hD 20 S: 1 m 3 /h to 20 m 3 /hIts maximum flowPossibilities:1°For simultaneous fertigation of all sectors:Maximum required irrigation flow,namely ≥ 12 m 3 /h:the required Dosatron is the D 20 S, up to 20 m 3 /h2°For fertigation, one sector at a time:Required irrigation flow in the largest sector,namely 3 000 x 2 l/h = 6 000 l/h, namely ≥ 6 m 3 /h:the required Dosatron in the D8R up to 8 m 3 /hNote: it is preferable to choose a Dosatron witha maximum flow capacity higher than the requiredirrigation flow in order to optimize its life.1 literNote: this solution preparation example isgiven for guidance only, and we cannot beresponsible for it. Please call your chemicalsupplier for further information.Recommendations:Adjustment %0.20.40.60.81.01.21.41.61.82.00,52501258363504236312825■ Standards and regulations in force in the countrymust be respected during installation and use onthe drinking water network.■ The installation must comprise a disconnector or anon-return valve upstream the injection system toprevent from any pollution of the water source.■ Install a 300-micron filter upstream the Dosatron,depending on the water quality.Note: the built-in filter in some models is no morethan a final safety device, and it must never be usedto replace the filter upstream.■ For assemblies in parallel, a single stock solutiontank should be used to supply the various Dosatrons.■ Never use an inlet T at the intake to draw in twodifferent solutions.■ The motor is lubricated by water, never apply greaseto the motor.For protection against water hammer, it is recommendedthat:■ Slowly opening and closing solenoid valves shouldbe used.■ If a Dosatron is used to supply several sectors, activatethe solenoid valves simultaneously (close onesector and open another sector at the same time).■ Start irrigation first, and start fertilization (totalbypass installation) only once the whole irrigationsystem is full of water (after a few minutes).Final concentration or sub-concentration in grams/liter0,7518812594756354474238125016712510083716356501.25 1.50 1.7520815612510489787063188150125107948375219175146125109978822001671431251111002.5Fertilizer weight in grams to be placedin a receptacle and topped up to 1 liter(thus the fertilizer density is ignored)250208179156139125The level in the stock solution tank must never behigher than the Dosatron (risk of siphoning).For acid dosing, it is preferable to move the aciddrum away from the Dosatron and put a cover onthe drum.Note: If the weight of acid in the stock solution ismore than 6% and up to 10%, choose a PVDFmodel (see option on page 4).325021418816715042502222005250