In the winter irrigation is downhearted and in summertime more water supply is used . " With a drip system , irrigation in summer is a maximum of 10 liters per square meter per day and in winter this is only 0.25 liters . That is a factor 40 difference of opinion , something you unremarkably do not encounter , " allege Stefan Bakker , product coach at Revaho . " And yet growers want an installation that can deliver the 0.25 and 10 liter accurately . This expect in advance measurement techniques . "
variegate rap compartment sizeIn addition to the relationship between irrigation in winter and summertime , there are also company with varying rap compartment size in the irrigation system . For example , 5 to 30 m3 / hr . During the winter menstruation only one drip mold session of 90 seconds per day is provided , the irrigation piddle at the spigot compartment of 5 m3 / hour is 125 liters and at that of 30 m3 / hour it is 750 liters . In addition to the deviance in the scheme , also inaccuracy in the water measurement is stimulate by the slowness in the organisation . A liter counter , which emits a heart rate every 10 liters , produces at 750 cubic decimeter an inaccuracy of 1.3 % ( 10/750 ) . At 125 cubic decimetre this is 8 % (= 10/125 ) .
Trend to gamey pulsingWith a water meter with a higher pulse output signal , for example at 1 liter ( 1 on 1 ) , measuring is more exact . At an irrigation of 30,000 l per hour , these are 30,000 pulses , or 8 pulses per second . Bakker : " A read contact can not handle so many pulses , which results in contact flapping . The contact begin to flap because it opens and close so quickly that additional pulse are created . This is a limit of the body of water meter . Yet growers want a high truth , because a deviation of 8 % is too much and so it is preferred to a pulse output of 1 to 1 and no contact flap . "
In a mechanical water time with a propellor also befoulment of the steel play a persona . As a result , the wheel gyration slows , reducing the accuracy of the water cadence . Wear and bust also makes the wheel turn stiffer and deviating ( less exact water mensuration ) . For uniformness it is important to cover to measure well and to have the correct pulsing .
Electronic water meterThe solution is a water meter with electronic production without read contact . These meters do not have a counter ( mechanical chemical mechanism ) anymore . An supersonic pee time is an example of such a meter . With this meter a higher accuracy has been attain in the horticulture sector . " increase the measure accuracy is possible by withdraw a stride in the technology . Even giving 10 pulses per cubic decimeter is possible . This does not puzzle out the backwardness of the organization , but rather the measuring accuracy at small frequence and small piss quantity " , grant to Bakker .
Source : Glastuinbouw Waterproof
