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EZ™ & Enhanced SDI Units
Applied Membranes now offers a cost-effective, automatic SDI Monitoring System.
Complies with ASTM D4189-95
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Monitoring the fouling tendency of RO feedwater has long been a challenge. Usually fouling is not noticed until the RO membranes need cleaning, resulting in expensive downtime or, worse yet, membrane replacement.
Numerous methods have been used to measure the fouling tendency of feed waters, including turbidity, particle counting, and manual silt density index (SDI) testing. It is difficult to correlate turbidity and particle counting to membrane fouling since they do not directly measure the fouling or "plugging" nature of the particles in suspension. Since the manual SDI test measures this plugging tendency, it has proven useful in indicating fouling tendencies. However, the manual SDI testing method is tedious and time-consuming.
The EZ SDI™ & Enhanced SDI automatically and consistently monitor the silt density index of RO feed water. Operators can quickly and regularly check the effectiveness of the RO pretreatment system without bothering with labor-intensive manual tests.
It is easy to install, easy to operate, and sells for a fraction of the cost of other automatic SDI testing equipment.
| Operation |
| The EZ SDI™ & Enhanced SDI are microprocessor controlled and fully automatic. The monitors are housed in a NEMA 4X enclosure and are designed for permanent installation in industrial environments. The filter holder allows the use of standard 25mm test filters available from a number of suppliers. Replacing the media is a two-minute process and the test is initiated with the press of a button.
A blinking indicator notifies the operator of completion of the test. The SDI results may then be read from the LCD display. The display is equipped with an LED backlight making it easy to see the results in any environment.
The test pressure is controlled with a high-quality internal pressure regulator which can accommodate inlet pressures above 100 psi. This allows the sample to be taken from the high pressure side of the RO feed pump, thus eliminating cumbersome and expensive sample boost pumps. The test pressure is constantly displayed in the LCD and the EZ SDI & Enhanced SDI™ alarms and aborts the test if the pressure falls outside of ASTM specifications.
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| Principle |
| The EZ SDI™ & Enhanced SDI use the same testing method as specified in ASTM D4189-95. This standard method indicates the quantity of particulate matter in water and is applicable to relatively low (<1.0 NTU) turbidity waters such as well water, filtered water, or clarified effluent samples. Since the size, shape, and nature of particulates may vary, this test method is not an absolute measurement of the quantity of particulate in a particular water source. Maximum SDI values of RO feed water are commonly specified by RO membrane manufacturers, and demonstrating adherence to these SDI specifications may be necessary to receive guaranteed performance from the membrane supplier.
As specified in the ASTM method, the EZ SDI™ & Enhanced SDI calculate SDI at five-, ten-, and fifteen-minute intervals. The monitor examines the temperature of the feed water and displays the change in temperature during the test.
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| Unique Features |
| The EZ SDI™ & Enhanced SDI incorporate a number of unique features which ensure reliable operation and dependable results |
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- Continuous Sample Flow -
The EZ SDI™ & Enhanced SDI are designed for permanent installation. In order to prevent stagnant conditions in the sample line, the monitor continuously allows a side stream of sample to flow through the monitor up to the point where the sample enters the filter. A specially designed orifice controls the rate of this side-stream flow. The orientation of the flow control orifice also allows air in the sample line to be separated from the sample before the sample enters the filter holder.
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- Air Venting -
The unique design of the filter holder allows air to be vented from the filter chamber before the beginning of each test. This, together with precise volume measurement, ensures that the repeatability of SDI values from the EZ SDI™ & Enhanced SDI monitors far exceed that of the manual test.
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Spare Parts
| Model No. |
Description |
Qty. in Pkg. |
| EZSDI-439 |
¼” Fuse 2 Amp, 250v |
1 |
| EZSDI-257 |
¼” ID Drain Tubing |
5 Feet |
| EZSDI-133 |
¼” OD Vent Tubing, 250 PSI |
100 Feet |
| EZSDI-360 |
Filter Holder with Drain Tube (for Y-EZSDI) |
1 |
| EZSDI-448 |
25 mm Replacement Filters (for Y-EZSDI) |
100 |
| EZSDI-466 |
Silicone O-Ring (for Y-EZSDI) |
1 |
| EZSDI-525 |
Volumetric Container Cover |
1 |
| EZSDI-496 |
Disposable Filter Cartridges (for Y-EZSDIC and Y-ENHSDI) |
100 |
| EZSDI-498 |
Cartridge Filter Fitting (for Y-EZSDIC and Y-ENHSDI) |
1 |
| EZSDI-507 |
Cartridge Filter Adapter (for Y-EZSDIC and Y-ENHSDI) |
1 |
| EZSDI-86 |
Pressure Regulator |
1 |
| EZSDI-258 |
In-Line Screen |
1 |
| EZSDI-465 |
Optical Level Switch |
1 |
| EZSDI-903 |
Manifold Solenoid Valve with Teflon Plunger |
1 |
| EZSDI-902 |
Drain Solenoid Valve with Teflon Plunger |
1 |
| EZSDI-536 |
Vent Solenoid Valve with Teflon Plunger (for Y-ENHSDI) |
1 |
| EZSDI-112 |
Water Vent Tubing Flow Orifice |
1 |
| EZSDI-134 |
Air and Water Vent Tubing Bulkhead connector |
1 |
| EZSDI-256 |
Drain Tube Hose Barb |
1 |
| EZ-1D-2YSPK |
Two-Year Spare Parts Kit (for Y-EZSDI)
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Includes (2) EZSDI-439, (1) EZSDI-360, (2) EZSDI-466, (1) EZ-SDI-525, (1) EZSDI-258, (1) EZSDI-465, (2) EZSDI-903, (1) EZSDI-902, and (1) EZSDI-112
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| EZ-4-2YSPK |
Two-Year Spare Parts Kit (for Y-ENHSDI) |
Includes (2) EZSDI-439, (1) EZSDI-498, (1) EZSDI-507, (1) EZSDI-525, (1) EZSDI-258, (1) EZSDI-465, (1) EZSDI-903, (1) EZSDI-536, and (1) EZSDI-112
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