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The EZ SDI-4™ Automated Silt Density Index Test System is designed to perform a standard Silt Density Index Test according to the ASTM D4189-07. The EZ SDI-4™ will perform four separate tests before filter replacement is necessary. Information is displayed on a back-lit liquid crystal display, and on individual light-emitting diodes (LED). Functions and controls are operated through switches on the membrane keypad.

The EZ SDI-4TM incorporates the following features:

One Temperature sensor to measure temperature change during test.

One Pressure sensor to ensure proper filter feed pressure.

Two Alarm Outputs; one for high or low filter feed pressure, and one for high SDI.

Logs and stores results from previous 64 tests.


Discrete Outputs One Normally-Open Form A, 2 Amp, 30 VDC/240 VAC
Analog Outputs Four 4-20 mA (optional)
Serial Ports One RS-232 (RJ Connector) for data download
User Interface 4 x 20 LCD with backlight; 4 Keys, Tactile
Realtime Clock Backed with Lithium Battery, 10 Year Life
Power 120-240 VAC,50-60 Hz, 0.8 A
Enclosure NEMA 4X enclosure
Mounting Wall Mounting
Dimensions EZ SDI™:11" high x 15" wide x 9" deep; EZ SDI-4™:11" high x 22.5" wide x 9" deep
Electrical All connections via removable screw terminals.
Environment 0 to 50 C (32 to 122 F), 10 to 90% relative humidity, non-condensing
Compliance Complies with ASTM D4189-07.
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  • Reverse Osmosis
  • UltraFiltration
  • MicroFiltration


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