SpectraPure
SpectraPure®Inc.
480.894.5437 Call us toll-free 1.800.685.2783
215 South Industrial Drive, Suite 2A Tempe, Arizona 85281-2941
®
6
Checking the Concentrate to Purified Water Ratio
This procedure will assure you of maximum life and reliability of
your SpectraPure System.
Failure to perform this procedure can permanently damage the
membranes and will void the pro-rated Membrane Warranty.
In order to maximize the life of your SpectraPure RO Membrane, you may
need to adjust the ratio of the concentrate to purified water. If not enough
concentrate is allowed to flow past the membrane during operation, the
impurities will precipitate out on the membrane surface, clogging the RO
Membrane. To keep this from happening, the Concentrate to Purified Water
Ratio
must
be checked and adjusted in order to compensate for pressure
and temperature variations that exist in all water supplies. The flow rate of
the concentrate must be a minimum of 4X the product flow rate. 4X to 6X is
an acceptable concentrate flow rate.
Procedure:
1. Open the cold water supply valve and let the system run for
15
minutes.
2. Collect product water from the
blue
tubing into a measuring cup
for one minute. Measure the collected amount in milliliters. This is
the
product flow rate
in Milliliters per Minute.
(Although not needed in this proceedure, the daily product
flow rate in Gallons per Day (GPD) can be calculated to be
equal to the product flow rate times
0.38
).
3. Multiply this value by 4. This is the
OPTIMUM concentrate flow
rate
in Milliliters per Minute.
4. Collect concentrate water from the
yellow
tubing into a measur-
ing cup for one minute. Measure the collected amount in milliliters.
This
is
the
ACTUAL concentrate flow rate
in Milliliters per Minute.
5.
If
the
actual concentrate flow rate
is
less than
the
optimum
concentrate
flow
rate
, you must reduce the length of the flow
restrictor capillary tubing as described on the next page. After
adjusting the flow restrictor, repeat the above procedure and
recheck the Concentrate to Purified Water Ratio.
System Set-Up
SpectraPure
®
SpectraPure®Inc
.
Fax 480.894.6109 Fax us toll-free 1.877.527.7873
E-mail: [email protected] Visit us on the web www.spectrapure.com
19
Testing the Quality of the Membrane
Membrane Output Calculation
Membranes produce the rated gallons per day (GPD) at 60 psi (4.1 bars) operat-
ing pressure, 77°F (25°C) operating temperature and 500 ppm total dissolved
solids.
Membrane output gallons per day (GPD) depends on operating pressure, water
temperature and the ppm TDS in the feed water.
Expected GPD = Rated GPD × PCF × TCF
PCF
is the pressure correction factor
TCF
is the temperature correction factor
Calculation of Pressure Correction Factor (PCF):
The output (GPD) from
the membrane is directly proportional to the applied pressure.
Note: The membrane is rated to produce the rated GPD at 60 psi. For any
pressure other than 60 psi the output GPD is multipled by the PCF.
PCF = Line Pressure (in psi) ÷ 60
Calculation of Temperature Correction Factor (TCF):
The output (GPD)
also decreases with decrease in temperature. This is because water viscosity
increases with decrease in water temperature.
Temperature Correction Factor Table (TCF)
°F
/°C TCF
°F
\°C TCF
°F
\°C TCF
41.0
/5
0.521 59.0
/15
0.730 77.0
/25
1.000
42.8
/6
0.540 60.8
/16
0.754 78.8
/26
1.031
44.6
/7
0.560 62.6
/17
0.779 80.6
/27
1.063
46.4
/8
0.578 64.4
/18
0.804 82.4
/28
1.094
48.2
/9
0.598 66.2
/19
0.830 84.2
/29
1.127
50.0
/10
0.620 68.0
/20
0.857 86.0
/30
1.161
51.8
/11
0.640 69.8
/21
0.884 87.8
/31
1.196
53.6
/12
0.661 71.6
/22
0.912 89.6
/32
1.232
55.4
/13
0.684 73.4
/23
0.941 91.4
/33
1.267
57.2/14
0.707 75.2
/24
0.970 93.2
/34
1.304
Production Rate
