Electromagnetic Vibratory Sieve Shaker

What is the Electromagnetic Vibratory Sieve Shaker?

A sieve shaker that uses an electromagnetic drive to produce three-dimensional throw motion with digitally controlled amplitude and time. It is the standard general-purpose choice for dry sieving of powders, sands and granules from about 20 µm to 125 mm in quality control laboratories.

Overview

The electromagnetic variant drives the sieve stack with an electromagnet and spring system so the stack moves in a vertical throw with a superimposed slight circular motion, which spreads material evenly over the mesh and moves it toward the aperture. Amplitude is set digitally, typically 0.2 to 3 mm, and run times up to several hours, with interval mode to reduce heating of samples. The instrument takes stacks of up to about 450 mm height with 200 mm sieves, 8 inch or 300 mm and sometimes 400 mm sieves, together with a clamping lid. Because amplitude is regulated by feedback control, results are reproducible between laboratories and operators. Noise is low compared with mechanical shakers, and optional enclosure reduces dust. Interval timers and programs are stored for standard methods.

How does it work?

A sieve analyzer agitates a stack of test sieves, arranged with the coarsest aperture on top, so that particles either pass through an aperture or are retained on it. The agitation may be vertical throw from an electromagnetic drive, horizontal circular motion combined with tapping, air jets that clear the mesh from below, or ultrasonic vibration for fine sieves. Particles pass when their smallest projected dimension is smaller than the aperture and their orientation allows. After a set time, each sieve and the receiver pan are weighed, and mass percentages are calculated as individual and cumulative retained or passing fractions. Sieve sizes and tolerances are defined in ISO 3310 and ASTM E11, and procedures in ISO 2591-1. Amplitude, time, sample mass and sieve condition govern repeatability and end-point.

What are the key features?

• Digitally set amplitude of 0.2 to 3 mm with feedback control
• Interval mode to reduce sample heating and improve sieving
• Stores multiple user programs for standard methods
• Accepts 200, 203 and 300 mm sieves with clamping lid
• Low-noise electromagnetic drive with minimal wear parts
• Optional dust enclosure and net weight logging interface

What are the technical specifications?

A typical electromagnetic vibratory sieve shaker configuration offers sieve diameters of 200, 203, 300 mm, amplitude of 0.2–3 mm, digital, timer of 1 s–99 h, interval mode, max sample load of ≈ 3 kg per stack, stack height of ≈ 450 mm and motion of 3D throw with circular component. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Electromagnetic Vibratory Sieve Shaker is used in construction aggregate grading, soil and sediment analysis, powder and granule quality control, fertilizer and chemical granule classification and food ingredient particle size. Across the wider Sieve Analyzers class, laboratories also deploy it for aggregate and sand grading in construction, soil and sediment particle size and mining and mineral processing.

Which standards and certifications apply?

Relevant standards and methods include ISO 3310-1, ISO 3310-2, ASTM E11, ISO 2591-1, ASTM C136, ASTM D422, ASTM B214 and GB/T 6003.1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Do not overload sieves; typical loads are a single layer of particles or 100 to 200 g on a 200 mm sieve, depending on aperture. Determine the test duration by checking that less than 0.1 percent of the sample mass passes per minute. Inspect sieves for damage, clean them with brushes or ultrasonic baths, and never use sharp tools on fine meshes. Periodically check sieve aperture conformity with certified reference materials or calibration sieves and optical measurement according to ISO 3310. Place the machine on a level, rigid bench, and use dust extraction for fine powders. Record humidity, since moisture causes agglomeration. Keep a maintenance schedule for drives and clamps.

How do I select the right Electromagnetic Vibratory Sieve Shaker?

Select the electromagnetic shaker for routine dry sieving of free-flowing materials where reproducible amplitude control and standard compliance matter. Specify sieve diameter, stack height, sample mass, amplitude range, need for program storage and dust protection. For fine cohesive powders, consider air jet, and for clay or sticky samples, wet sieving.

How does it compare with other Sieve Analyzers variants?

Select the mechanism from the material. Free-flowing granules and aggregates above about 100 µm suit electromagnetic or tapping shakers. Fine, cohesive powders between roughly 20 and 150 µm need air jet or ultrasonic assistance to prevent blinding. Materials that agglomerate or contain soluble fines need wet sieving. Consider the sieve diameter (200, 300 or 400 mm), maximum stack height, load capacity and programmable amplitude and time. Verify compatibility with the standard you follow, such as ASTM C136 for aggregates, ASTM D422 or ISO 17892-4 for soils, or ISO 2591-1. Noise, dust enclosure, digital amplitude control and whether results are recorded electronically also matter. Compare with laser diffraction or image analysis only after noting that sieve and optical sizes differ.