Netafim NETAFLEX 3G User manual

V 003.02 - DECEMBER 2020
NETAFLEX
™3G
USER MANUAL

© COPYRIGHT 2020, NETAFIM
NO PARTS OF THIS PUBLICATION MAY BE REPRODUCED, STORED IN AN AUTOMATED DATA FILE OR MADE PUBLIC IN
ANY FORM OR BY ANY MEANS, WHETHER ELECTRONIC, MECHANICAL, BY PHOTOCOPYING, RECORDING OR IN ANY
OTHER MANNER WITHOUT PRIOR WRITTEN PERMISSION OF THE PUBLISHER.
ALTHOUGH NETAFIM TAKES THE GREATEST POSSIBLE CARE IN DESIGNING AND PRODUCING BOTH ITS PRODUCTS
AND THE ASSOCIATED DOCUMENTATION, THEY MAY STILL INCLUDE FAULTS.
NETAFIM WILL NOT ACCEPT RESPONSIBILITY FOR DAMAGE RESULTING FROM THE USE OF NETAFIM'S PRODUCTS OR
THE USE OF THIS MANUAL.
NETAFIM RESERVES THE RIGHT TO MAKE CHANGES AND IMPROVEMENTS TO ITS PRODUCTS AND/OR THE ASSOCIATED
DOCUMENTATION WITHOUT PRIOR NOTICE.
FOREIGN LANGUAGES
In the event that you are reading this manual in a language other than the English language, you
acknowledge and agree that the English language version shall prevail in case of inconsistency or
contradiction in interpretation or translation.

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Use of symbols
Safety
Safety instructions
Safety instructions when using acid/chemicals
Description
Introduction
Highlights
Advantages
Specifications
Dual volume system
Add-ons
Typical installation overview
Schematic diagram
Dimensions
Weights
Operation, maintenance and winterization
Operation
Maintenance
Winterization
Troublehooting
Symptoms regarding more than one single dosing channel
Symptoms regarding a single dosing channel
Symptoms while idle
The NetaFlex™ 3G is not running
Calibration
1. Calculation of dosing channels opening percentage
2. Simulation with a 10 liter (2 US gal) bucket of water
3. Calibration of the NetaFlex™ 3G while irrigating
Spare parts
200 L - Horizontal Pump
200 L - Vertical Pump
Dosing channel
Venturis
System pump list
Hydraulic condition checklist
Warranty
CONTENTS

4 NETAFLEX™ 3G USER MANUAL
ELECTRICAL HAZARD
Contains instructions aimed at preventing bodily injury or direct damage to the NetaFlex™ 3G
and/or the infrastructure in the presence of electricity.
The symbols used in this manual refer to the following:
USE OF SYMBOLS
WARNING
Contains instructions aimed at preventing bodily injury or direct damage to the crops, the
NetaFlex™ 3G and/or the infrastructure.
CAUTION
Contains instructions aimed at preventing unwanted system operation, installation or conditions
that, if not followed, might void the warranty.
ATTENTION
Contains instructions aimed at enhancing the efficiency of usage of the instructions in the
manual.
NOTE
Contains instructions aimed at emphasizing certain aspect of the operation of the system or
installation.
SAFETY FOOTWEAR
Contains instructions aimed at preventing foot injury.
TIP
Provides clarification, tips or useful information.
ACID HAZARD
Contains instructions aimed at preventing bodily injury or direct damage to the crops, the
product and/or the infrastructure in the presence of acid.
PROTECTIVE EQUIPMENT
Contains instructions aimed at preventing damage to health or bodily injury in the
presence of fertilizers, acid or other chemicals.
EXAMPLE
Provides an example to clarify the operation of the settings, method of operation or installation.
The values used in the examples are hypothetical. Do not apply these values to your own
situation.

NETAFLEX™ 3G USER MANUAL 5
SAFETY
•All safety regulations must be applied.
•Ensure that the installation is carried out in a manner that prevents leaks from the NetaFlex™ 3G,
the fertilizer/acid tanks and lines, the peripherals and the accessories, contaminating the
environment, soil or ambient area.
•Electrical installation must be performed by an authorized electrician only.
•The electrical installation must comply with the local safety standards and regulations.
•Installation must be performed by authorized technicians only.
•Protection provided by the equipment can be impaired if the equipment is used in a manner other than
that specified by the manufacturer.
WARNING
In agricultural environment - always wear protective footwear.
Safety instructions
WARNING
Measures must be taken to prevent fertilizer infiltration of the water source, to avoid water pollution.
NOTE
The maximum sound level produced by the equipment does not exceed 70dB.
CAUTION
When opening or closing any manual valve, always do it gradually, to prevent damage to the
system by water hammer.

6 NETAFLEX™ 3G USER MANUAL
Safety instructions when using acid/chemicals
SAFETY
ACID HAZARD
When using acid - always observe the acid manufacturer's safety instructions.
WARNING
Always use protective equipment, gloves and goggles when handling fertilizers, acid and
other chemicals!
WARNING
Exceeding the recommended acid concentrations will damage the dosing channels.
WARNING
Substances such as chemicals for pest/disease control might be corrosive and damage the
NetaFlex™ 3G. When using any substance other than fertilizers or acids not exceeding the
concentrations in table 1 above, always observe the manufacturer's instructions for corrosivity.
In case of any doubt, consult your local Netafim™ representative.
ATTENTION
When dosing acid, use a dosing channel fitted with the appropriate components according to the type
and concentration of acid used*:
For pH correction For maintenance of drippers
Type of dosing channel
Diaphragm
and O-rings
Nitric acid
(HNO3)
Phosphoric
acid
(H3PO4)
Sulfuric acid
(H2SO4)
Potassium
hydroxide
(KOH)
Acetic acid
(CH3COOH)
Hydrochloric
(HCl)
Hydrogen
peroxide
(H2O2)
Chlorine (as (hypochloride
For diluted acid EPDM <3% <85% <30% <35% <30% <10% <30% <1%
For concentrated acid Viton <40% <85% <90% <10% <5% <33% <50% <10%
% is by weight at 21oC (70oF)
*The table indicates the resistance of the dosing channel components to acid,
and is not a recommendation to use the acids mentioned.

NETAFLEX™ 3G USER MANUAL 7
DESCRIPTION
Introduction
The NetaFlex™ 3G is a reliable open-tank dosing system.
The NetaFlex™ 3G ensures very precise and homogeneous nutrient dosing for greenhouse crops.
The NetaFlex™ 3G is a modular CE-compliant dosing system that easily integrates with multiple Netafim™
and third-party control and monitoring systems.
The NetaFlex™ 3G always injects a uniform quantity of nutrients while performing perfect EC and pH
control.
The NetaFlex™ 3G features a 200 liter open mixing tank fitted with a movable float valve enabling the
preparation of 100 or 200 liter solutions.
The NetaFlex™ 3G can accommodate a wide variety of dosing channels for fertilizer and concentrated/
diluted acid. Up to 6 dosing channels of various types, from 50 l/hr (13 GPH) each, up to 600 l/hr (158
GPH) each, in many mixed configurations.
The NetaFlex™ 3G accommodates a wide variety of system pumps, peripherals and accessories to meet a
vast range of applications and infrastructure constraints.
Highlights
•Wide range of soil/substrate applications
•Built around a standard platform
•Minimal investment requirement
•Efficient water, fertilizer and energy consumption
•Very large range of irrigation water capacities
•Quantitative or proportional Nutrigation capabilities
•Precise single or dual EC/pH monitoring and control - selectable by customer.
•Almost completely maintenance-free Venturi operations - no moving parts
•Highly accurate dosing channels equipped with quick action dosing valves
•Fast and efficient Nutrigation recipe adjustments
•Easy integration into existing irrigation systems, Netafim's NMC, and third-party controllers
•Multilingual system
•Wide range of integrated accessories and peripherals
•High-quality components and PVC
•Aluminum, corrosion-resistant frame with adjustable legs
•Made by Netafim™
Advantages
•Easy to install and maintain system
•Highly profitable price/performance ratio
•Requires minimal investment with rapid ROI
•Productive: Employing precise EC and pH control assists in delivering a high quality product with
outstanding yields (single or dual EC and pH control sets are available).
•Uniform: Delivers a consistent quantity or ratio of nutrients in a homogenous solution thanks to an open
mixing tank design.
•Flexible: Works with a wide range of dosing channel flow rates up to 6 units of 50-600 l/hr (13-158 GPH).
Each dosing channel is fitted with a multipurpose dosing valve for the dosing of fertilizer or acid,
at any dosing rate up to 600 l/hr (158 GPH). Compatible with 50/60 Hz electricity frequency.
•Scalable: System flow rates from 3 m3/h (13 GPM) to 64 m3/h (282 GPM).
Open mixing tank allows the preparation of 100 or 200 liter solutions.
•Focused: Made for soil/soilless greenhouse applications.

8 NETAFLEX™ 3G USER MANUAL
Specifications
Output flow rate and pressure
The NetaFlex™ 3G ensures a satisfactory mixture in a vast range of system performances.
Flow rate from 3 m3/h (13 GPM) to 64 m3/h (282 GPM) at a wide range of output pressure according to
the selected system pump.
A single NetaFlex™ 3G will accommodate from a 0.1 Ha (0.25 Acres) to a 10 Ha (25 Acres) nursery.
For output pressure lower than 3.0 bar (44 PSI) consult your local Netafim™ representative.
Fertilizer dosing capacity
The NetaFlex™ 3G accommodates up to 6 dosing channels of various types in many mixed configuration:
•50 l/hr (13 GPH) •150 l/hr (40 GPH) •400 l/hr (105 GPH) •600 l/hr (158 GPH)
* For applications requiring more than 6 dosing channels - consult your local Netafim™ representative.
Dual volume system
The NetaFlex™ 3G can perform with 100 or 200 liter
solutions depending on the float valve location.
•Top location for 200 liter solution (as supplied)
•Bottom location for 100 liter solution
(supplied sealed with a rubber plug)
To shift the float valve location
•Remove the rubber plug [A] from the other location.
•Disconnect the controll tube [B] from the float valve.
•Disconnect the float valve [C] .
•Insert the rubber plug in its stead.
•Install the float valve at the other location.
•Connect the controll tube.
•After activation, check for leaks and fix if required.
Add-ons
You can extend the functionality of your NetaFlex™ 3G by means of the many add-ons offering a wide
variety of useful functions. All the add-ons are easy to connect to the NetaFlex™ 3G - here are a few
examples:
Fertilizer meter with electric output
Enables continuous reading of fertilizer dosing. Useful in applications where the costumer wants a broader
indication on fertilizer flow on top of the EC and pH readings.
Stock selection
Enables the dosing of multiple fertilizers through a single dosing channel (in cases where simultaneous
dosing is not required).
Available in a wide variety of configurations, from a single channel with 2 fertilizers to as many channels
and fertilizers as required.
For further information on the NetaFlex™ 3G add-ons, consult your local Netafim™ representative.
DESCRIPTION
A
B
C

NETAFLEX™ 3G USER MANUAL 9
DESCRIPTION
Typical installation overview
The drawing below represents a typical NetaFlex™ 3G infrastructure.
NetaFlex™ 3G
Filling pump
Filling line filter
Pressure reducing valve
Fertilizer/acid stock tank
Manual valve (fertilizer)
Fertilizer/acid filter
Water meter

10 NETAFLEX™ 3G USER MANUAL
DESCRIPTION
Schematic diagram
scope of delivery
direction of flow
LEGEND
System pump
Tank
Dosing channel + Venturi
Control panel, including:
Controller, EC/pH tranceducer,
electric switchboard.
EC sensors (2)
pH sensors (2)
Float valve
Pressure gauge
Upper manifold filter
Low level switch
Non-return valve
Filling pump
Filling line filter
Pressure reducing valve
Fertilizer/acid stock tank
Manual valve (fertilizer)
Fertilizer/acid filter
Water meter

NETAFLEX™ 3G USER MANUAL 11
DESCRIPTION
Dimensions
H
D
W
NetaFlex™ 3G external dimensions (W/D/H*) Package dimensions (W/D/H**)
109/148/133.5 cm (43/58.3/52.5") 131/166/159 cm (51.5/65.5/62.5")
*The height varies by ±1 cm (±0.5") according to the adjustment of the legs.
**The package height includes the pallet height of 15 cm (6").
NOTE
Allow 20 cm (8") arround the NetaFlex™ 3G for inlet, outlet and fertilizer pipes connections.
Weights°
The weight of the NetaFlex™ 3G varies according to the selected system pump.
50Hz
System pump Net weight° Packed weight°
CM10 -3 156 kg. (344 lbs.) 286 kg. (631 lbs.)
CM10 - 4 159 kg. (351 lbs.) 289 kg. (637 lbs.)
CM15-4 175 kg. (386 lbs.) 305 kg. (673 lbs.)
CM25-2 153 kg. (337 lbs.) 283 kg. (624 lbs.)
CM25-3 176 kg. (388 lbs.) 306 kg. (675 lbs.)
CR32-3-2 217 kg. (478 lbs.) 347 kg. (765 lbs.)
CR32-3 217 kg. (478 lbs.) 347 kg. (765 lbs.)
CR45-2 237 kg. (522 lbs.) 367 kg. (809 lbs.)
CR45-3-2 284 kg. (626 lbs.) 414 kg. (913 lbs.)
CR64-2-1 283 kg. (624 lbs.) 413 kg. (911 lbs.)
CR64-2 240 kg. (529 lbs.) 370 kg. (816 lbs.)
60Hz
System pump Net weight° Packed weight°
CM10 -2 158 kg. (348 lbs.) 288 kg. (635 lbs.)
CM10 -3 161 kg. (355 lbs.) 291 kg. (642 lbs.)
CM15-2 160 kg. (353 lbs.) 290 kg. (639 lbs.)
CM25-2 172 kg. (379 lbs.) 302 kg. (665 lbs.)
CR32-2-2 214 kg. (472 lbs.) 344 kg. (758 lbs.)
CR32-2 226 kg. (498 lbs.) 356 kg. (785 lbs.)
CR45-2-2 280 kg. (617 lbs.) 410 kg. (904 lbs.)
CR45 -1 233 kg. (514 lbs.) 363 kg. (800 lbs.)
CR64-1 279 kg. (615 lbs.) 409 kg. (902 lbs.)
CR64-2-2 296 kg. (653 lbs.) 426 kg. (939 lbs.)
°Order of magnitude only - final weights are issued with the product order.
Extrenal dimensions

12 NETAFLEX™ 3G USER MANUAL
OPERATION AND MAINTENANCE
Operation
The routine operation of the NetaFlex™ 3G is almost totally automatic, controlled by the controller
(for the operation of the controller, see the Controller Manual).
Necessary conditions for the proper operation of the NetaFlex™ 3G:
•Electricity is supplied to the NetaFlex™ 3G.
•Source water should enter the NetaFlex™ 3G at a flow rate equal to the maximum flow rate required
for the field.
If the flow rate at the inlet of the NetaFlex™ 3G is insufficient, the low level switch will be activated
and the NetaFlex™ 3G operation will be stopped.
•The water entering the NetaFlex™ 3G should be within a pressure range of 2 to 4.5 bar
(29 PSI to 65 PSI).
•The water entering the NetaFlex™ 3G should be within a temperature range of 10°C to 35°C
(50°F to 95°F).
•The source water to the NetaFlex™ 3G should be of a satisfactory chemical quality. If water
pre-treatment is required, apply chemical conditioning before the water reaches the NetaFlex™ 3G.
Dual dosing channel
If more than 4 dosing channels are required (up to 6),
the dual dosing channel option is installed.
• Up to 2 dual dosing channels can be installed on the NetaFlex™ 3G ,
at the farthest manifold positions (1 and 4).
CAUTION
There are fertilizer combinations that should never be used in
the dual dosing channel as they will induce crystalization and
cause clogging of the pipes.
• Calcium Nitrate + Ammonium Sulfate => Calcium Sulfate
• Calcium Nitrate + Potassium Sulfate => Calcium Sulfate
• MKP + Calcium Nitrate => Calcium Phosphate
• MAP + Calcium Nitrate => Calcium Phosphate
• Phosphoric acid + Calcium Nitrate => Calcium Phosphate
In case of doubt regarding the use of any combination of
fertilizers in the dual dosing channel , consult your local
Netafim™ representative.

NETAFLEX™ 3G USER MANUAL 13
OPERATION AND MAINTENANCE
Maintenance
WARNING
Never perform maintenance/repair of the NetaFlex™ 3G when the system is under pressure.
Before performing maintenance/repair of the NetaFlex™ 3G, always set the controller to PAUSE.
After completing the maintenance/repair activity always set the controller out of the PAUSE setting back
to its previous setting.
CAUTION
When opening or closing any manual valve, always do it gradually, to prevent damage to the
system by water hammer.
To prevent failures and extend the life cycle of the NetaFlex™ 3G, the user must carry out regular
maintenance.
•Keep the NetaFlex™ 3G dosing unit and its immediate environment clean and dry.
CAUTION
Before calibrating the EC and pH sensors, make sure there is no pressure in the system.
•The NetaFlex™ 3G 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
Rinsing of upper manifold filter Every 4 weeks
Water and fertilizer leak inspection Once a week Visual inspection
Calibration of the pH sensor Every 2-4 weeks See the EC/pH Transmitter Manual
Calibration of the EC sensor Every 4 weeks
* Manual filters only.

14 NETAFLEX™ 3G USER MANUAL
OPERATION AND MAINTENANCE
Check the NetaFlex™ 3G hydraulic conditions every 4 weeks
Check the pressure gauge and the Rotameters of the dosing channels and compare the
data to the initial settings in the controller (NMC Pro - screen 7.6). Make sure that no significant
changes occurred to the hydraulic conditions of the NetaFlex™ 3G.
When verifying the flow rate for each dosing channel,
make sure the cursors on all the Rotameters are adjusted.
NOTE
The Rotameter's sacle is calibrated by the manufacturer for measurement of the
flow rate of water (H2O). Certain inacuracies may be observed when the flow rate
of liquids with different densities, such as fertilizers and acids, is measured.
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.
Winterization
CAUTION
When opening or closing any manual valve, always do it gradually, to prevent damage to the
system by water hammer.
If the NetaFlex™ 3G is located in an unheated space where the temperature might drop below 5°C (41°F), if
the system is not required for irrigation during the winter, perform the following procedure to avoid damage
caused by freezing when the NetaFlex™ 3G is idle for the winter period:
At the beginning of winter:
CAUTION
Before removing the EC and pH sensors, make sure there is no pressure in the system.
• Remove EC and pH sensors and store the pH sensor immersed in KCL solution (supplied with the sensor)
or in calibration buffer 4 at temperature 18-25˚C (64-77˚F). The pH sensor must never be dry
(see the EC/pH Transmitter Manual).
•Empty the NetaFlex™ 3G of water.
At the end of winter:
NOTE
It is reccomended to install new EC and pH sensors at the begining of a new season.
•Reinstall the EC and pH sensors and calibrate them (see the EC/pH Transmitter Manual).
•Restore the pressure in the system.

NETAFLEX™ 3G USER MANUAL 15
TROUBLESHOOTING
This chapter is a systematic guide to the actions to be taken in the case of a malfunction of the NetaFlex™ 3G.
WARNING
Never perform maintenance/repair of the NetaFlex™ 3G when the system is under pressure.
Before performing maintenance/repair of the NetaFlex™ 3G, always set the controller to PAUSE.
After completing the maintenance/repair activity always set the controller out of the PAUSE setting back
to its previous setting.
ATTENTION
Before proceeding to troubleshoot any malfunction, make sure that:
•The controller settings regarding the dosing channels are correct and match the dosing channels
of the NetaFlex™ 3G (see the Controller Manual).
•The controller settings regarding the field valves are correct (see the Controller Manual).
Perform the actions in their order of appearance until the malfunction is fixed.
If you identify faulty parts - consult your local Netafim™ representative.
CAUTION
Only qualified electricians are permitted to perform electrical installations and repairs!
CAUTION
If isolation valves have been installed on the system, ensure that they are in closed position
before troubleshooting any hydraulic malfunction.
ATTENTION
If fertilizers from a different manufacturer have been recently in use and changes in EC and pH are
recorded, perform calibration of the system before assuming a malfunction of the NetaFlex™ 3G
(see Appendix 1 - Calibration, page 22).
Symptoms regarding more than one single dosing channel
If one or more of the following symptoms occur regarding more than one single dosing channel,
perform the actions listed bellow:
Controller warnings
•Low EC
•High pH
•Low fertilizer/acid flow rate
Rotameter reading
•Low fertilizer/acid flow rate
Action
1) For controller warnings only - check and calibrate the EC and pH sensors
(see the EC/pH Transmitter Manual).
2) Have a qualified electrician check that electricity is being supplied to the NetaFlex™ 3G and that all
the electrical components are properly connected (see the Switchboard documentation ).

16 NETAFLEX™ 3G USER MANUAL
3) Compare the readings of the pressure gauge and the Rotameters of the dosing channels to the readings
before the malfunction started and check wether changes occurred to the hydraulic conditions.
If YES, restore the original hydraulic conditions.
If NO or if the malfunction is still not fixed after restoring the original hydraulic conditions,
have a qualified electrician check the system pump:
Does it function? Does it rotate in the correct direction?
If the pump does not rotate in the correct direction - the electrician should swap between
phases L1 and L3 (see the system pump Manual).
4) Make sure there is no air pocket in the system pump impeller chamber:
Loosen the dosing system pump's bleeding screw and wait until a stable flow, free of air-bubbles, is
obtained, then retighten the bleeding screw (act according to the instructions in the system pump Manual).
5) Check the system pump's impeller chamber for clogging:
If it is clogged - it should be dismantled and thoroughly cleaned (act according to the instructions in
the system pump Manual).
If after implementing all the above steps the malfunction is still not fixed - consult your your local Netafim™
representative.
Symptoms regarding a single dosing channel
If one or more of the following symptoms occur regarding a
single dosing channel, perform the actions listed bellow:
TROUBLESHOOTING
A
B
C
D
G
E
F

NETAFLEX™ 3G USER MANUAL 17
TROUBLESHOOTING
Controller warnings
•Low EC
•High pH
•Low fertilizer/acid flow rate
Rotameter reading
•Low fertilizer/acid flow rate
Action
1) Check that there is fertilizer/acid solution in the stock tank A.
2) Check that the stock tank manual valve Bis in the OPEN position.
3) Check that the fertilizer/acid filter Cis clean - If not, it should be dismantled and thoroughly cleaned.
4) Check the fertilizer/acid line D(from the stock tank to the dosing channel) for leaks and breaches
and make sure all the connectors are tightened.
5) Make sure the dosing channel's needle valve Eis open according to the the initial setting.
6) Visually check the needle valve Efor chemical damage (internal deformation).
If internal deformation is present - replace the needle valve.
7) Visually check the needle valve Efor clogging.
If clogging is present - thoroughly clean the needle valve.
8) Check that the dosing valve Fis functioning:
With the controller in MANUAL mode, set the dosing valve Fto ON (see the Controller Manual).
The LED on the dosing valve should be lit.
If it is not - have a qualified electrician check the dosing valve's cable for electrical continuity.
If the cable is in working order - check the controller (see the Controller Manual).
If the controller and the cable are in working order - toggle the dosing valve
Fto OFF and again to ON
in the controller ( see the Controller Manual ). A "Click" should be heard from the dosing valve with each
toggle - If a "Click" is not heard, replace the dosing valve (consult your local Netafim™ representative).
If a "Click" is heard and the dosing valve Fstill does not open - disconnect the dosing valve from the
dosing channel and with the dosing valve set to ON in the controller (see the Controller Manual),
check for clogging by injecting water at low pressure through the dosing valve.
If there is clogging - thoroughly clean the dosing valve Fwith running water.
If there is no clogging and the dosing valve Fstill does not open - replace it
(consult your local Netafim™ representative).
If after implementing all the above steps the malfunction is still not fixed -
9) Disconnect the Venturi Gfrom the manifolds and from the dosing channel and check it for clogging,
visually and by injecting water at low pressure through it.
If there is clogging - thoroughly clean the Venturi Gwith running water.
10) Visually check the Venturi Gfor chemical damage (internal deformation).
If internal deformation is present - replace the Venturi (consult your local Netafim™ representative).
If after implementing all the above steps the malfunction is still not fixed - consult your local Netafim™
representative .

18 NETAFLEX™ 3G USER MANUAL
TROUBLESHOOTING
Symptoms while idle
If the following symptoms occur while the NetaFlex™ 3G is idle,
perform the actions listed bellow:
Controller warnings
•High EC
•Low pH
•While idle - Uncontrolled fertilizer/acid flow rate or a fertilizer/acid leak or breach
Action
NOTE
Make sure the dosing valve selector is in the CLOSED position.
Check if the dosing valves leak when closed:
1) Close all the manual valves Bfor fertilizers and acid.
2) Make sure the level of the solution in all the the stock tanks is higher than the
dosing valves.
3) With the controller in MANUAL mode, set all the dosing valves to OFF
(see the Controller Manual).
4) Disconect one of the the dosing valves from the Venturi
(downstream from the dosing valve).
5) Open the fertilizer manual valve B.
If a leak from the dosing valve is visible - disconect the dosing valve from the dosing channel.
6) With the controller in MANUAL mode, set the dosing valve to ON
(see the Controller Manual).
7) Thoroughly clean the dosing valve with running water.
8) Repeat steps 4-7 for each fertilizer and acid dosing channel.
9) After completing the procedure, open all the manual valves Bfor fertilizers and acid.
10) If the malfunction is still not fixed - replace the dosing valve .
If after implementing all the above steps the malfunction is still not fixed - consult your local Netafim™
representative .
OPEN CLOSE

NETAFLEX™ 3G USER MANUAL 19
TROUBLESHOOTING
The NetaFlex™ 3G is not running
If the following symptom occurs during operation, perform the actions listed below:
Controller warning
•NO FLOW.
Action
1) Check if the water in the tank
reaches the float.
Check the water supply at the inlet of
the NetaFlex™ 3G. The flow rate should
be equal to the maximum flow rate required
for the field and the pressure should be between 2 bar and 4.5 bar (29 PSI and 65 PSI) according to
the system requirements. If it is not, restore the original water supply conditions.
2) Make sure the filters on the main line upstream from the NetaFlex™ 3G are clean and free of
clogging.
3) Check the finger filter of the float
valve’s command loop for clogging.
If it is clogged - dismantle it and clean
it thoroughly with running water.
CAUTION
Only qualified electricians are permitted to perform electrical installations and repairs!
4) Have a qualified electrician check the overload protection breaker (see the Switchboard documentation):
If it is not on the ON position, turn it to ON.
If it is on the ON position, toggle it once to OFF and to ON again
(do not repeat this action).
If the overload protection breaker trips (turns to OFF or to TRIP) again, the electrician will check if the
system pump is in working order (see the system pump Manual) and check if there are irregularities
in the electricity voltage supplied to the NetaFlex™ 3G.
If after implementing all the above steps the malfunction is still not fixed - consult your local Netafim™
representative .
Normal level
Low level

20 NETAFLEX™ 3G USER MANUAL
CALIBRATION
The process of calibrating the NetaFlex™ 3G is carried out in three stages:
1. Calculation of dosing channels opening percentage
To finely calibrate the NetaFlex™ 3G in order to achieve homogeneous and stable dosing, perform the
following calculation for each dosing channel (fertilizers and acid) to determine the amount of suction
reduction needed to attain the required fertilizer/acid flow rate.
Flow rate of the largest irrigation shift
Dosing ratio of a single fertilizer/acid
Result: a single fertilizer/acid flow rate
Result: target Rotameter reading
EXAMPLE
=
X
m3/hr
l/m3
l/hr
l/hr
X 1.25 =
30
8
240
300
Metric units
EXAMPLE
X 0.06 =
X
GPM
US gal/1000 US gal
GPH
GPH
X 1.25 =
130
8
62
78
US units
X 0.06 =
X
GPM
US gal/1000 US gal
GPH
GPH
X 1.25 =
=
X
m3/hr
l/m3
l/hr
l/hr
X 1.25 =
Flow rate of the largest irrigation shift
Dosing ratio of a single fertilizer/acid
Result: a single fertilizer/acid flow rate
Result: target Rotameter reading
DEFINITION
Dosing ratio = The quantity of fertilizer/acid (l)
1 m3irrigation water
DEFINITION
Dosing ratio = The quantity of fertilizer/acid (US gal)
1 THG (1000 US gal) irrigation water
NOTE
The Rotameter's sacle is calibrated by the manufacturer for measurement of the flow rate of water
(H2O). Certain inacuracies may be observed when the flow rate of liquids with different densities,
such as fertilizers and acids, is measured.
2. Simulation test with a 10 liter (2 US gal) bucket of water
Instruments needed
•Good-quality portable EC and pH sensors, finely calibrated
•Calibration solutions for EC and pH
•Bucket with a scale for up to 10 liters (2 US gallons)
•Measuring tube or syringe with a scale for up to 100 cc (1 oz)
•Clean (preferably distilled) water for cleaning sensors during calibration
•Blotting paper for cleaning and drying
The client prepares the fertilizer solutions and the acid solution (if required) in the stock tanks according to
the recipe advised by the agronomist/consultant.
ATTENTION
Ensure the fertilizers and acid solutions in the stock tanks have been thoroughly agitated before
starting the simulation.