| Recirculation
System |
All R.O. membrane elements require a minimum concentrate
flow out of the membrane element, i.e., 3 GPM for a 4" dia. membrane element.
Without recirculation, this amount of water must completely go to drain.
With the Recirculation System, a fixed amount of water (equal to the design
capacity of the system) is sent to the drain and the remainder is recycled
into the feed to the membrane element thereby conserving water. This option
is standard on most of our R.O. systems. |
| Low Feed Pressure
Control Switch |
The Low Pressure Protection Switch is installed on the
outlet side of the system prefilter(s). It is a safety protection device
to protect the high pressure pump from running dry by electrically shutting
down the R.O. system if the water pressure after the prefilter(s) drops
less than 10 PSI. The R.O. will automatically restart if the pressure
rises above 15 PSI. Initial start up of the high pressure pump creates
an instantaneous high demand for water. If the inlet pressure is marginal,
the R.O. unit could attempt to start and then shut down because of low
pressure. The pressure will then rise, the unit will attempt to start
again, and shut down again. This cycle could repeat itself many times.
This usually results in damage to the high pressure pump and/or motor.
It is important to have adequate incoming pressure (> 30 PSI) and adequately
sized feed piping to the R.O. unit. We recommend the feed piping to the
R.O. unit be at least the same size as the inlet connection, but we would
prefer that it be one size larger. For instance, the inlet connection
on a BLS 1900 R.O. unit is 1/2" NPTF. The inlet piping should be at least
1/2" pipe but preferably 3/4" pipe. This option is standard on most of
our R.O. systems. |
| Carbon Block PreFilter |
The Carbon Block Prefilter is used for two purposes.
TFC and High Flow membranes are manufactured from a material that is chemically
attacked by Chlorine and other oxidizing agents. Activated Carbon removes
the Chlorine from the feed water to the system. Activated Carbon also
removes some organics and can improve taste and odor. |
| Feed Water Pressure
Gauges |
The Feed Water Pressure Gauge is installed on the inlet
side of the system prefilter(s). It measures the pressure of the feed
water before it enters the system. When used in conjunction with the Filter
Pressure Gauge, it can be used to calculate the pressure drop across the
system prefilter(s). When the pressure drop reaches 12 PSI higher than
the pressure drop across the new clean filter cartridge(s), it is time
to replace the filter cartridge(s). |
| Filter Pressure Gauge |
The Filter Pressure Gauge is installed on the outlet
side of the system prefilter(s). It measures the pressure of the feed
water after the system prefilter(s). This is the pressure that is seen
by the Low Feed Pressure Control Switch. When used in conjunction with
the Feed Water Pressure Gauge, it can be used to calculate the pressure
drop across the system prefilter(s). When the pressure drop reaches 12
PSI higher than the pressure drop across the new clean filter cartridge(s),
it is time to replace the filter cartridge(s). |
| Product Water Control
Switch |
If you are storing the system Product water in a pressurized
storage tank, the Product Water Control Switch will automatically stop
the system when the tank pressure reaches 40 PSI and restarts the system
when the pressure reaches 20 PSI. It can also be used as a safety switch
if the product water line is blocked, i.e., a valve is closed. The reason
this is important is that the R.O. membrane is supported in the direction
of normal flow to withstand the high pressure required to produce product
water but it is not supported in the reverse direction. Excessive pressure
on the product side of the membrane could cause the membrane to rupture
resulting in high product flow and TDS. |
| Product Pressure
Relief Valve |
The Product Pressure Relief Valve is a mechanical safety
relief valve which will release excessive pressure if the product water
line is blocked, i.e., a valve is closed. The reason this is important
is that the R.O. membrane is supported in the direction of normal flow
to withstand the high pressure required to produce product water but it
is not supported in the reverse direction. Excessive pressure on the product
side of the membrane could cause the membrane to rupture resulting in
high product flow and TDS. |
| Stainless Steel Pressure
Vessels |
Stainless Steel Pressure Vessels are replacements for
the standard PVC pressure vessels on most systems. They are usually selected
for aesthetic reasons since the standard PVC pressure vessels have a working
pressure rating of 230 PSI. |
| Product & Reject
Water Flowmeters |
The basic design of a majority of our R.O. systems is
a fixed orifice reject flow controller which is rated at the system theoretical
product output, i.e., a BLS 400 has a 400 GPD reject flow controller.
The actual product output of any R.O. system is dependent on many factors.
Some are feed water TDS, feed water temperature, and product water back
pressure. To conserve water usage, the reject water can be regulated to
the same flow rate as the product output while increasing the amount of
recirculation. By installing a Product Flowmeter, you can directly read
the actual amount of product being produced. By replacing the reject flow
controller with a Reject Flowmeter & Valve, you can regulate the reject
flow to be equal to the product flow. |
| TDS In-Line Monitor
|
On our smaller systems, we offer a TDS In-Line Monitor.
It is a monitor which has 8 different TDS dip switch settings. You select
the visual alarm point point. It is battery operated. There is a push
button on the face of the monitor that, when pushed, activates the monitor.
If the product water TDS is less than the set point a GREEN light illuminates.
If the product water TDS is more than the set point a RED light illuminates.
|
| TDS Analog Meter
|
On our larger systems, we offer a TDS Analog Meter. It
is powered from the system control circuitry and provides a constant analog
read out of the Product TDS while the system is operating. |
| TDS Digital Meter
|
On our larger systems, we also offer a TDS Digital Meter.
It is powered from the system control circuitry and provides a constant
digital read out of the product TDS while the system is operating. You
can set an exact alarm set point. A GREEN light is continuously illuminated
when the product water TDS is below the set point or a RED list is continuously
illuminated when it is above the set point. It also has dry (non-powered)
N.O. and N.C. contacts which could be used for an external alarm if you
so desired. |
| Manual Flush System |
A periodic increase of the flow rate past the membrane
increases the turbulence on the membrane surface which can help prevent
membrane clement fouling. By opening the Manual Flush System ball valve
for as little as 5 minutes once per week, you may increase the life of
the membrane element. This option is standard on most of our R.O. systems. |
| Automatic Flush
System |
A periodic increase of the flow rate past the membrane
increases the turbulence on the membrane surface which can help prevent
membrane element fouling. Setting the Autoflush Timer is as simple as
pushing a few buttons. You simply set the correct time and then select
Monday-Through-Friday, Saturday-Sunday, Monday-Through-Sunday, or any
single day for the number of times per week you would like the R.O. system
to automatically flush. You can then select from one to six times per
day for that flush to occur and finally you decide the length of time
for the flush. Care should be taken to try to select a time when the R.O.
system will most likely not be operating. The Autoflush Timer will automatically
open the Autoflush Solenoid Valve on the day, at the time, and for the
duration you programmed. |
| Time Delay Air Purge
|
When R.O. systems do not operate for long periods of
time, the system can drain allowing air to replace the water. Almost all
of our systems have recirculation of reject water as a part of the standard
design. If air is in the system, this air is recirculated through the
system and can cause damage to the pump and membrane element. The Time
Delay Air Purge is an adjustable timer (or timer with delay) which can
be easily set to delay the startup of the system high pressure pump for
a period of time (usually one minute) after the inlet solenoid valve opens
to fill the system with water before the high pressure pump starts. |
| Tank Level Float
Control |
If the Product water is going to be stored in an atmospheric
storage tank, some type of level switch is required to stop the R.O. system
when the tank is full or the storage tank will overflow. The Tank Level
Float Control is a mechanically activated wide angle normally-closed float
switch which is easily installed and can be adjusted to activate in as
little as 3" or as much as 22" of tank height. |
| Low Level Float
Cut-Out Switch |
Running dry can damage most centrifugal pumps. The Low
Level Float Cut-Out Switch is a mechanically activated wide-angle normally-open
float switch which is easily installed and can be adjusted to activate
in as little as 3" or as much as 22" of tank height to stop a repressurization
pump before the tank is empty. |
