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
20
5
0
X
Y
Source water
35
25
10
40
30
15
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
C
D
E
A
B
C
D
E
CAUTION
There are fertilizer combinations that should
never
be used in any concentration in the dual dosing
, page 8)
