by automatically maintaining a constant 30 psi
(2.07 bar) in the feed stream to the filter.
Page 2 FS1061EN
Flow rates are measured during the collection of
500 mL samples at the start of the test and after 5,
10, and 15 minutes. SDI units (percent decay per
minute) represent the degree of plugging that may
occur due to the feedwater stream particulate and
colloidal levels. The 15-minute SDI (SDI 15) is defined
by ASTM D 4189-95 as the interval required for ac-
curate and standardized testing. The 5- and 10-
minute SDI values are only estimates of the 15-
minute value.
In addition to calculating SDI 15, the measured
decay in flow rate is also converted from an SDI
value to plugging factor (PF) value, a number
between 1 and 100%. 100 percent means the filter
is completely plugged. This provides an under-
standable point of reference for the potential of
your RO membranes to plug—the higher the per-
centage, the faster your membranes may become
fouled with particulates.
Table 1 details the product characteristics and or-
dering information.
Table 1: Product Characteristics/Ordering Information
Product Characteristics
Range, SDI (15 minutes) 0-6.7 SDI units
Range, Plugging Factor 1-100% plugged
Electrical Power Selection 110-120V 60Hz or
220-230V 50Hz
Water Supply ¼-inch OD tubing via
quick-connect, 0.8 gpm
(3.0 Lpm) flow
Water Pressure – psi (bar) 65-100 (4.5-6.9)
HxWxD – inches (mm) 6x14x10 (15x36x26)
Weight – lb (kg) 8.0 (3.6)
Ordering Information
AutoSDI Tester Kit, 115V 1227464
AutoSDI Tester Kit, 220V 1227473
AutoSDI User’s Manual 1227468
SDI Membrane Filters, Box of 100 1215281
SDI Booster Pump Assembly,
120/240 VAC
3052333
Features
• In-Field flow calibration
• Built to ASTM D 4189-95
• No special tools or skills required
• Push-button operation
• Turn it on and walk away
• Lightweight and portable
• Rugged carrying case
• Audible alert with silence mode
• Repeatability within 0.2 SDI units
• LCD display
• Results remain on screen until reset
• Continuous flow readout in mL/min
• Global voltage compatibility
• Membrane replacement availability on-line
The Fast, User-Friendly, and Accurate Way of
Measuring Silt Density Index
1. Connect Water
2. Insert Filter
3. Press Button
4. Read Results
For more information
• Tel: 800-444-8212 USA
• Canada Tel: 952-988-6665
• Web: www.geosmolabstore.com
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