Netafim NETAFLEX 3G, Installation Manual

Page: 25 / 32

NETAFLEX™ 3G INSTALLATION MANUAL 25
CALIBRATION
If the EC and pH target values cannot be attained, and the dosing valves are opened more than 85%,
measures should be taken to increase the dosing ratio - if feasible, slightly increase the concentration of
the fertilizer solution and/or reduce the water flow rate to the field during irrigation.
If not - consult the agronomist/consultant.
In a field where the flow rate changes significantly from one irrigation shift to the next, try to be at a
minimum of 50% dosing valve opening for the low flow rate shift, and a maximum of 80% for the high
flow rate shift.
When the calibration process is completed, return to the EC and pH control screen in the controller,
define the deviation in EC and pH values for the channels and switch the EC and pH control to ON
(NMC Pro - screen 7.7-7.6).
In the EC and pH alarm definitions, define the EC and pH deviation from the target values that, if attained,
will trigger the alarm and set the EC and pH alarm to the ON position (activated)
(NMC Pro - screen 3.5-3.6).
NOTE
EC and pH values must not exceed a ±30% deviation from the target values.
ATTENTION
Once a month, read the measured flow rates of the dosing channels and compare them with
the flow rates defined in the controller, in order to check whether changes have occurred
(NMC Pro - screen 7.6).
After completing the calibration process, write down the data as reference for calibration of the
NetaFlex™ 3G in the future.