Introduction
A silt density index tester is an instrument used to measure the silt density index (SDI) of the water, which is a measure of the fouling potential of the water for the membrane systems, such as the reverse osmosis and the ultrafiltration systems, and it is used in the water treatment, the desalination, the power, and the many other industries for the assessment of the feed water quality. The silt density index is measured by the filtration of the water through a membrane filter of a specified pore size, typically 0.45 micrometers, at a constant pressure, and the time required for the filtration of a specified volume is measured at the beginning and after a specified time interval, and the SDI is calculated from the ratio of the times, which indicates the rate of the clogging of the membrane by the suspended particles and the colloids in the water; the higher the SDI, the higher the fouling potential, and the lower the allowable recovery of the membrane system; the silt density index tester consists of a pressure vessel or a holder for the membrane filter, a pressure gauge, a flow control, and a timer, and it provides a controlled and a reproducible measurement, with features such as the pressure regulation and the timing, and it is used for the assessment of the feed water for the membrane systems, for the monitoring of the performance of the pretreatment, for the troubleshooting of the membrane fouling, and for many other applications. Silt density index testers are used in the water treatment plants, in the desalination plants, in the power plants, in the industrial water treatment, and for many other applications. With their SDI measurement, silt density index testers are essential for the membrane system feed water assessment.
Manual Silt Density Index Tester LSDI-T2020
Manual Silt Density Index Tester operates with a 0.45 µm, 47 mm membrane filter and 0.24–0.5 MPa feed pressure range for accurate measurement. Constructed with a durable 304 stainless ...
Portable Silt Density Index Tester LSDI-T2010
Portable Silt Density Index Tester measures in the range of 0 to 20, ensuring accurate water quality assessment. It features a filtration time selection from 1 to 15 minutes for flexible...
Standards
ASTM D4189-23-Standard Test Method for Silt Density Index (SDI) of Water
Complies with the above standards, but is not limited to them.
Features
1. Silt density index tester for RO feed water fouling assessment.
2. Test kit with membrane holder, pressure control and timing.
3. For desalination, water treatment and reverse osmosis plants.
4. Includes tester, 0.45 um discs, pressure regulator and manual.
5. Measures SDI to predict particulate and colloidal fouling.
FAQ
Q1: What scenarios is this tester used for?
A: It measures the silt density index of reverse osmosis feed water by timing filtration through a 0.45 micrometer membrane at constant pressure, predicting colloidal and particulate fouling in RO and desalination plants.
Q2: What standards does it comply with?
A: It follows ASTM D4189 for SDI, related ISO and water treatment guidance, with pressure and timing verified. We confirm the stated performance during final inspection and can supply a certificate of conformity together with supporting documents for audit purposes.
Q3: What is the warranty?
A: The tester carries a 12 to 24 month warranty covering the holder and regulator. Membrane discs are consumables. Damage from over-pressure or misuse is excluded.
Q4: Is it hard to operate?
A: Operation is simple for trained water operators: apply pressure, collect timed filtrate and calculate SDI. We provide a manual and guidance.
Q5: What is the lead time?
A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.
Q6: Is calibration required?
A: Verify the pressure gauge periodically and use the specified membrane. Keep test records for plant control.
Q7: Are consumables universal?
A: The 0.45 micrometer discs are standard, while holders are kit-specific. Ongoing cost is disc replacement.
Q8: Can it be customized?
A: Yes, several configurations are available. Options include portable cases, automatic timers, multiple test stations and spare discs. We can discuss further custom requirements, confirm feasibility and advise any effect on the schedule before the order is confirmed.
Q9: Is installation included?
A: Standard delivery includes the tester and manual. Setup is performed by the user.
Q10: What waters are compatible?
A: It handles RO feed and similar waters. It is not for heavily contaminated water that instantly blocks the membrane, non-aqueous samples, or pressures beyond the regulator rating.
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