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5.2.4 Technical Characteristics of the osmosis unit
Vessel
Particular attention has been devoted to the vessel made of stainless steel 304. It has an internal
system that prevents the telescopic effect of the membrane due to the higher pressures generated as
the membrane becomes more and more clogged. The frontal compartment allows easy inspection
and replacement of the membrane without removing the unit from its housing.
Membrane
Produces a quantity of permeate equal to 150 litres/hour using only one selective wound spiral
membrane in polyamide (PA), type 3512 650GDP.
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Membrane type: Thin-film composite
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Membrane material: Polyamide
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Configuration of the elements; wound spiral
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Maximum pressure 10 bar
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Maximum operating temperature: 45°C
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pH: 3-10
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Maximum turbidity; 1.0 NTU
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Maximum SDI: 5.0
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Maximum chlorine concentration: 0.1 mg/lt
Flood detector
To render the working area safer and prevent damage to the system, the machine is equipped with a
flood detector.
Differential pressure switch
The differential pressure switch is used to activate and deactivate the pump motor that pressurises
the membranes when a command signal is received.
The differential is divided into two signals:
stop signal, when the pressure of the circuit which includes the expansion vessel reaches the
preset value (e.g., 3 bar), the machine stops. The value can be changed with a standard Phillips
screwdriver.