NETAJET
™
4G USER MANUAL
23
OPERATION AND MAINTENANCE
Maintenance
CAUTION
When opening or closing any manual valve, always do so gradually, to prevent damage to the
system by water hammer.
To prevent failures and extend the life cycle of the NetaJet™ 4G, the user must carry out regular
maintenance.
• Keep the NetaJet™ 4G dosing unit and its immediate environment clean and dry.
CAUTION
Before calibrating the EC and pH sensors, gradually close the isolation valves and open the
sampling outlet until the pressure in the system is released.
• The NetaJet™ 4G dosing unit and the supply water and irrigation system must be inspected regularly.
Regular inspection
Description How often Instructions
Rinsing of fertilizer filters* Once a day
Rinsing of supply water filters* Once a day
Water and fertilizer leak inspection Once a week Visual inspection
Calibration of the pH sensor Every 2-4 weeks
See the EC/pH Transducer Manual
Calibration of the EC sensor Every 4 weeks
* Manual filters only.
Check the NetaJet
™
4G hydraulic conditions every 4 weeks
Check the main line flow meter and pressure gauge, the upper manifold and lower
manifold pressure gauges and the Rotameters of the dosing channels, fill in the data on
the NetaJet™ 4G Hydraulic Conditions Checklist (page 45) provided by the installer and
make sure that all the hydraulic conditions match the reference data.
When verifying the flow rate for each dosing channel, make sure the cursors on all the
Rotameters are adjusted.
NOTE
The Rotameter's scale is calibrated by the manufacturer for measurement of the
flow rate of water (H
2O). Certain inacuracies may be observed when measuring the
flow rates of liquids with different densities, such as fertilizers and acids.
ATTENTION
Once a month, read the measured flow rates of the dosing channels
and compare them with the flow rates defined in the controller,
to check whether any changes have occurred.
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