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SpectraPure
SpectraPure®Inc.
480.894.5437 Call us toll-free 1.800.685.2783
2167 East Fifth St, Tempe, Arizona 85281
®
10
Fig. B: Flow Restrictor Tables
(For 4:1 Concentrate to Product Ratio)
FR
-
90
ml./min. gpd
in. cm.
269 102 1 2.5
233 88 2 5.1
213 81 3 7.6
198 75 4 10.2
183 69 5 12.7
175 67 6 15.2
164 62 7 17.8
154 58 8 20.3
148 56 9 22.9
141 54 10 25.4
136 52 11 27.9
133 50 12 30.5
129 49 13 33.0
128 48 14 35.6
124 47 15 38.1
124 47 16 40.6
PRODUCT RATE CUT TO LENGTH
FR-180
ml./min. gpd
in. cm.
490 186 1 2.5
460 175 2 5.1
430 163 3 7.6
400 152 4 10.2
379 144 5 12.7
356 135 6 15.2
344 131 7 17.8
326 124 8 20.3
311 118 9 22.9
300 114 10 25.4
289 110 11 27.9
281 107 12 30.5
270 103 13 33.0
263 100 14 35.6
259 98 15 38.1
256 97 16 40.6
PRODUCT RATE CUT TO LENGTH
(GREEN)
(YELLOW or WHITE)
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
15
SpectraPure
®
RO MEMBRANE DIAGNOSTICS
Although RO membranes are capable of maintaining high water quality
over extended periods of time they eventually will begin to deteriorate.
Normally, the conductivity of the permeate water will increase as the
membranes age. By comparing the difference in TDS readings between
the Tap water conductivity and the RO water conductivity, the per-
centage of rejection of the RO membrane may be calculated and the
resultant number may then be used to determine the condition of the
membrane and thus the operator will know when the membrane needs
to be replaced. Membrane failure will be indicated by a reduction of the
percentage of rejection which will be determined by calculating the dif-
ferential between the input and output numbers.
In order to accurately determine the condition of the RO Membrane, a
conductivity tester (TDS meter) capable of reading the tap water
conductivity and the permeate water conductivity has been provided
with this system. With the assistance of the TDS meter you will be able to
easily determine the RO membrane’s condition. (see page 7)
Before performing the diagnostic test on the RO membrane, make sure
that the RO system has been “ON” and producing pure water for a mini-
mum of 10 minutes. Also check the brine (yellow) line to make sure that
water is flowing and that the flow ratio between the permeate water
and the brine water is at a ratio that is > 4 to 1. ( See Page 9). (NOTE: The
pressure gauge should indicate a pressure reading of > 40 PSI during this
15-20 minute test period.
Procedure:
1. Turn on the meter 1 by depressing the on switch.
2. Locate the meter slide switch on the front of the DM-1 TDS meter.
3. Slide the switch to the “Left” and read the Tap water conductivity then
record the reading ________ .
4. Next, slide the switch the to “Right” and read the permeate water
conductivity then record the reading ________.
5. See page 7 on “TESTING THE RO MEMBRANE REJECTION RATE ”