Gilson Silent Sifters® are the newest laboratory sifter models that reflect today's emphasis on noise reduction and worker protection in the laboratory environment. They significantly reduce operational noise levels with no loss of particle sizing accuracy and performance. Gilson's proprietary silencing technology has resulted in units with noise levels 7–18dB quieter than standard rotary sifters.
State departments of transportation often prefer the rotary sifter for aggregate gradations. The optimum size range of the Silent Sifter is from 1in–No.635 (25mm–20µm). Silent Sifters can instantly convert between 8 to 12in and 200 to 300mm test sieve diameter sizes. Sieve capacity ranges from six 12in diameter full-height sieves to twenty 8in diameter half-height sieves, including a pan.
No clamping is required. Simply place the sieve stack in the cabinet, close the door, tilt the cabinet to test position, and press start. The test sieves are continuously rotated by rubber-covered stainless-steel drive rollers, and particle separation is aided by mechanical hammers tapping against each sieve.
The tightly sealed cabinet uses sound-deadening materials and a proprietary design to limit noise during operation. The cabinet is a high-quality CNC machined MDF board, precisely fitted to confine and control airborne respirable quartz, silica, crystalline particles, and other nuisance dust to further protect personnel and permit easy cleanup. The full-width cabinet door swings open fully on heavy-duty commercial-grade hinges to permit easy loading and unloading of test sieves. The cabinet sits atop a sturdy powder-coated stand constructed of heavy ASTM A513 steel tubing and rolls on 4in hard rubber locking swivel casters for easy mobility in the lab.
Test sieves and drive mechanisms are enclosed by the cabinet to safeguard against injury. Bearing and rod safety covers further eliminate exposed moving parts below the cabinet for greater compliance with OSHA regulations. Tapping hammer assemblies are 6061 aluminum alloy with Ultra High Molecular Weight (UHMW) Polyethylene heads. A dependable 1/4hp continuous-duty motor drives the system. A safety interlock switch disables the sifter and resets the timer if the door is opened during testing.
A digital countdown timer/controller precisely controls operation up to 99 minutes and 59 seconds at ±1sec. The timer features a pause function so the test cycle can be postponed and resumed with no loss of test time. Time is shown on a large, bright 0.5in (12.7mm) LED display. Settings are saved between test cycles, and the timer sounds with a 5-second audible alarm at completion.
SS-21 Silent Sifter noise levels are 7–10dB lower than traditional rotary sifters.
SS-22 Silent Sifter II offers the highest level of noise reduction and much lower dust levels. Specifically engineered with advanced soundproofing materials and techniques, this sifter is 16–18dB quieter than standard rotary sifters and 8–10dB quieter than the SS-21 Silent Sifter. A heavy-duty, over-center latches to pull doors tightly against cabinet gaskets to ensure a tight, dust-proof seal and enhanced noise control.
| 8in/200mm Sieve Capacity (Full-Height / Half-Height) | 12in/300mm Sieve Capacity (Full-Height / Half-Height) | 12in Sieve Capacity (Intermediate-Height) |
| 10 / 20 | 6 / 13 | 10 |
Features
- Lower operational noise levels than any other rotary sifter
- Advanced design and materials for better performance and longer life
- DOT preferred particle sizing method
- Large swivel casters roll easily and lock securely
Included Items
- Gilson Silent Sifter
Accessories
- ASTM or ISO Test Sieves are available in a large range of opening sizes and various frame heights. Sieves are constructed of all stainless steel, all brass, or with a brass frame and stainless steel cloth.
- Polyethylene Hammer Head is compatible with all sifter models and is a part of the Hammer Assembly.
- Timer/Controller is a digital countdown timer with a timing capacity of up to 99 minutes, 59 seconds.
- Hammer Assembly includes hammer body, head, and hardware, and improves operational efficiency.
- Tapper Caps are plastic caps for tapping heads, sold in a package of 10.
- Bearing and Rod Safety Covers are sold in a package of six.
- Swivel Casters provide easy positioning.
Related blogs:
- Characteristics of Aggregates: Shape, Size & Specific Gravity
- Sieve Analysis of Coarse Aggregate: From the Field to the Lab
- Simple Steps to Preserve & Extend Service Life of Costly Equipment
- Steps to Reduce Nuisance Dust & Prevent Silica Exposure
- Steps to Reduce Nuisance Dust & Prevent Silica Exposure
- Dust and Noise: Can Better Testing Equipment Help? Part 1 Dust
- Dust and Noise: Can Better Equipment Help? Part 2: Noise
- Coarse Aggregate Gradation: Test Sieves or Screen Trays?
