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Spectrapure, Spectrapure®inc, Fr-90 – Spectra Watermakers THE MAXCAP RO/DITM SF-MT-0.5-10 User Manual

Page 10: Fr-180, Green) (yellow or white) spectrapure®inc, Ro membrane diagnostics

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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: [email protected] 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 ”

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