10
NETAJET
™
4G INSTALLATION MANUAL
DESCRIPTION
Analog dosing channel
The NetaJet™ 4G is the first fertilizer-dosing system equipped with Netafim's unique innovative analog
dosing channel.
The analog dosing channel is the long-awaited solution for very accurate and reliable EC/pH control for
Nutrigation™ of high-value greenhouse crops.
The analog dosing channel is equipped with a servo motor capable of continuous variable opening from 0
to 100%. This unique feature allows unprecedented precise and seamless Nutrigation™.
Advantages
• Ultra-high precision
• Smooth and stable hydraulic operation
• No fluctuations
• Fast EC/pH set-point reaching
• Short stabilization time
• Enables short Nutrigation™ cycles
• No risk of cavitation damage to the booster
Stabilization time
The analog dosing channel offers the benefit of a
significantly shorter stabilization time compared with
the digital (pulsating) dosing channel (up to 50%).
This is particularly beneficial when performing short
Nutrigation™ cycles typical of greenhouse crops.
• X = Analog (continuous-variable) dosing channel
• Y = Digital (pulsating) dosing channel
Dual dosing channel
The NetaJet™ 4G Octa mode (8 dosing channels) includes 3 dual dosing channel.
The dual dosing channel is applicable with 50 l/h (13 GPH) and 600 l/h (158 GPH) Venturis.
Dual dosing channel schematic diagram
pH
Time (sec)
10
9
8
7
6
5
4
3
2
1
0
205
0
X
Y
Source water
352510 403015 45 50
Analog (continuous-variable) dosing channel
Digital (pulsating) dosing channel
pH set point
Digital (ON/OFF) vs. analog dosing channel
performances
A
Rotameter
B
Needle valve
C
Dosing valve
D
Check valve
E
Venturi
A
B
CDE
A
B
CDE
CAUTION
There are fertilizer combinations that should never be used in any concentration in the dual dosing
channel! (see CAUTION, page 8)
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