SpectraPure
SpectraPure®Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
®
18
RO MEMBRANE DIAGNOSTICS
In order to accurately determine the condition of the RO Membrane, a
conductivity tester capable of reading the tap water conductivity and
the product water conductivity would be required (see Performance
Test page 23-24) but the included electronic purity monitor is capable of
providing a general idea of the membrane’s condition.
Before performing the following membrane test with the purity monitor,
the DI cartridges most be removed and the empty housings re-installed;
also, the waste to product water ratio must be 4 to 1 or greater (see page
11-12).
1. Turn on the system, let it operate long enough to fill the empty DI
housings, then let it run for an additional 20 minutes.
2. Remove the cover from the monitor.
3. Set all switches to the down or OFF Position except switch #1 is ON.
4. Push the test button and record the light indication (a good
membrane will show green).
5. Continue through each switch number in order until you observe
a red light indication.
6. Record the number of the last green light indication.
7. Look at the graph on page 9. Compare your highest green light
indication to the number represented in uS or PPM.
As a general rule we would consider the RO membrane to be in good
condition if a green light indication is observed on switch #3 or above.
(The higher the switch number the better).
8. If you are in doubt or if you observe a red light on switch #1
or #2 we would recommend calling the factory for assistance.
(This condition could be due to either a faulty membrane or
monitor).
9. Return monitor to switch #7 ON, all others are OFF.
Note: All water sources are different and are subject to changes in con-
ductivity from season to season which could affect the monitor reading
depending on the time of the year. For this reason we recommend the
use of a conductivity tester in order to receive the most accurate mea-
SpectraPure®Inc
.
Fax 480.894.6109 Fax us toll-free 1.877.527.7873
E-mail: spectra@spectrapure.com Visit us on the web www.spectrapure.com
11
SpectraPure
®
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 membrane 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 Puri-
fied 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. Direct
both tube down the drain.
2.
Collect product water from the blue tubing into a measuring cup for one minute.
Measure the collected amount in milli-liters. Do the same with the waste water
from the yellow line.
WASTE (YELLOW) IN MILILITERS______________
DIVIDED BY
PRODUCT (BLUE) IN MILILITERS______________
The resultant is the Concentrate to Product Ratio
(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.
If ratio is less than 4:1
Disconnect yellow drain line from the membrane housing and then remove flow restrictor.
Use the appropriate Waste to Product ratio to determine how long to cut the flow restric-
tor in order to obtain a 4:1 ratio. ( Figure D)
* Please refer to pages 13-14 for Flow Restrictor Removal, Adjustment, and Replacement. *
4.
If ratio is greater than 6:1
, flow restrictor requires replacement (Please contact
SpectraPure Inc).
5. Turn on feed supply.
6. This completes the procedure.
