Specifications

23G-Series RO System
3024270 Rev G 6 14Oct13
1.4 Flow Description
The pretreated feedwater passes through a disposable 5 micron cartridge
filter (pre-filter) which removes suspended solids. Filtered water then flows
to the inlet control valve. This solenoid-actuated valve is controlled by
Enhanced Controller/Monitor (ECM-100) and opens when the machine is
turned on, allowing water to flow to the pump inlet. When the machine is
turned off, the valve closes, preventing laminar flow through the
membrane element, which would lead to shortened membrane life.
The pump feeds water to the membrane element housings in a series
and/or parallel configuration, depending upon the design flow rates. The
direction of water flow is indicated by an arrow on each membrane
element housing.
Permeate from each membrane element housing is collected at the
permeate manifold where a common check valve prevents backflow into
the membrane elements. A pressure sensor is provided to allow the ECM-
100 to monitor excessive backpressure and initiate an immediate alarm
and machine shutdown should the setpoint be exceeded. Permeate is
directed through a turbine flow sensor and contacts a conductivity sensor
before reaching the outlet point of the machine.
The concentrate leaves the last membrane element housing and flows into
the manifold block. This concentrated water is then divided into recycle
and concentrate streams. The recycle portion mixes with the feedwater by
returning to the inlet piping, allowing higher machine recovery while still
maintaining adequate crossflow through the membrane elements. The
concentrate valve on a 23G machine is used to increase the concentrate
flow rate for flushing. The normal concentrate flow rate is controlled by the
concentrate orifice. The concentrate valve or orifice has three functions: it
controls the amount of concentrate flowing to the drain; it controls the
pressure within the machine; and it helps control system recovery. A
solenoid-controlled Autoflush valve is also provided in the concentrate line
to provide periodic intervals of increased drain flow rate controlled by the
ECM-100. The concentrate portion leaving the manifold block is directed
through a turbine flow sensor before reaching the outlet point of the
machine.