Terms and abbreviations
The list below states the abbreviations and terms relating to all disinfection units, purification
units and fertiliser dosing units. Therefore, abbreviations and terms that do not apply to
your specific unit and as a result are not used in this manual, may still be found in the list
below.
ExplanationAbbreviation / term
A principle where fertiliser solutions are prepared manually in 2 (or possibly more)
fertiliser tanks, in such concentrations that the unit has to mix them in equal
quantities.
A+B principle
A principle where the unit mixes the fertiliser solutions from 3 (or possibly more)
fertiliser tanks in the ratios as programmed in the recipe.
ABC principle
Chemical solution to clean the line walls of the distribution system periodically.Anti-block
Cleaning of a filter by flushing it with rinse water, against the normal direction of
flow, with the dirty rinse water being discharged. Backwashing can periodically be
performed automatically using electric valves and a rinse water pump controlled
from the process computer.
(to) Backwash a sand filter
Cleaning a filter by flushing it with rinse water, in counter flow, and draining away
the dirty water. Backwashing can be done automatically using electric valves and
a rinse water pump that are controlled by the process computer.
(to) Backwash
Control for the A+B principle that levels any differences in level in the emptying
tanks over time. This allows to fill-up the tanks at the same time.
Balance level control
Switch, switching sensor or relay with 2 positions: normally open (NO) and normally
closed (NC). "Normally" refers to the idle position when the component has not
been activated.
Change-over contact
The unit carries the irrigation water directly to the crop area and controls the
irrigation valves.
Direct distribution
A wide mesh type of filterDirt filter
Discharging irrigation water (e.g. to the sewer) via a (usually manually operated)
discharge valve at the beginning of the main irrigation line. This can be necessary
if the irrigation water is not of the desired quality (e.g. during the adjustment of
the EC and pH controls).
(to) Discharge, discharge valve
Treating the water in such a way that the (pathogenic) micro-organisms can no
longer reproduce. The micro-organisms are not necessarily killed. See also “sterilise”.
Disinfect (disinfection)
Water that has been disinfected by the water disinfection unit.Disinfected water
Measurement of the volume of drain water over a specific time and of the EC value
of the drain water (or measurement of one of both).
Drain measurement
For UV light: the average intensity of the active part of the light to which the water
is exposed during the residence time, expressed in mJ/cm2 (intensity (W/cm2) x
time (s) = energy (J/cm2). In order to produce more easily readable numbers, the
figure for the energy is multiplied by 1000 and then expressed as mJ/cm2. The
average intensity is calculated from the intensity measured with the UV sensor, the
distance between the UV sensor and the quartz tube, the T10 value determined at
the start of the production, the outside diameter of the quartz tube and the inside
diameter of the chamber.
Dose
Water that is not taken up by the plant and is then collected for reuse.Drain water
Water that flows through the venturi's of the dosing channels to create a vacuum
for suctioning fertiliser, or acid or lye solution.
Drive water
Electrical Conductivity, in the horticultural usually in terms of millisiemens per
centimetre (mS/cm).
EC
Control to mix drain water and fresh water such that the supply water has the
desired EC value. This EC value is a base for further increase of the EC value by
fertiliser dosing.
EC pre-control
The flow sensor gives a number of pulses per unit of volume passed. The flow
sensor is used to measure the volume passing through (flow).
Flowsensor
Memory that retains data (such as settings), even after power switch-off or mains
voltage failure.
Flash memory
Switch installed in a water tank or silo. The float switch transmits a signal when the
water reaches the same level as the float. (See also level sensor and level sensor)
Float switch
Replacing the irrigation water in the main irrigation line by other/new irrigation
water (e.g. after changing the recipe). Flushing takes place by opening the flush
valve (usually controlled by the process computer) at the end of the main irrigation
line and pumping the new irrigation water in the irrigation line.
(to) Flush, flush valve
NutriJet - user - 00.00262
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