LMSM 300/450 Sieve Shaker
The LMSM-300/450 is suitable for the batch wise and continuous sieving of soft, middle hard, hard and brittle materials in the dry and wet state and is designed for analytical test sieves from 200mm up to 450 mm.
The LMSM-300/450 is suitable for the batch wise and continuous sieving of soft, middle hard, hard and brittle materials in the dry and wet state and is designed for analytical test sieves from 200mm to 450 mm.
The machine is designed to give precise and reproducible results. Due to the wide choice of parameter combinations it is possible to achieve fast and reliable sieving results in a short time.
Depending on the characteristic of the sample material to be sieved a sieving process can be done down to 20μm.
The optimum filling level for each test sieve depends on the sieve frame diameter (200/203/300/450) and in relation of the mesh size of the test sieve.
The LMSM is maintenance free due to the electromagnetic vibrating unit. The vibratory action produced by the power unit moves the sample over the sieve in a unique way producing faster more efficient sieving, while the rapid vertical movements also help to keep the apertures clear from blinding.
The vibration is controlled by a microprocessor. The digital controller is used to set both the process time and the amplitude setting while a further control enables the vibration to run continuously or intermittently. Intermittent vibration improves performance and helps to clear apertures that may have become blocked. The controller will also set the duration of both the on and off times of the vibration. All sieving parameters are digitally pre-selected and can be stored and recalled.
Features and Benefits
- Optimum sieving results
- Suitable for dry and wet sieving
- Suitable for batch sieving
- For test sieves of up 450mm
- CE certified
- Suitable for 20μm up to 150 mm mesh sizes
- All sieving parameters can be digitally pre-selected
- Interval mode adjustable
- Optimum operation due to ergonomic key pad
Technical Specifications
| Applications | separate, classify, and analyze particle sizes in materials like powders, aggregates, and soils for quality control and research purposes. |
| Working principle | sieving with vibrations |
| Vibrational frequency regulation | from 3 to 30 Hz (180 - 1800 min-1), in 0.1 Hz steps |
| Setting adjustment method | control panel |
| Time setting | 00 Sec - 99 Minutes, Display of sieving time in minutes |
| Maximum sieve diameter | 450mm diameter |
| Minimum sieve diameter | 200mm diameter |
| Sieve mesh sizes availible | Woven wire: 20μm - 125mm Square hole perforated plate: 4mm - 125mm Round hole perforated plate: 1mm - 125mm Wet washing: 20μm - 125mm |
| Sieve stack | up to 10 sieves plus collector and lid |
| Ambient temperature | 5°C - 40°C |
| Atmospheric humidity | 85% RH |
| Electrical requirements | 450/750W |
| Power supply | 230V - 50Hz |
| Power connection | 1 phase |
| Fuses | 2 x T2A 250V |
| Standard | CE |
| Protection code | IP40 |
| Weight | 85kg |
| Dimensions (width x length x height) | 480 x 500 x 1150 mm |
Sieve shaker working principle
The LMSM300/400 Sieve Shaker is engineered for precise and efficient particle size separation. It operates by vibrating a stack of test sieves with progressively finer mesh sizes, allowing particles to be separated layer by layer. As the bulk material moves through the sieve stack—from the coarsest mesh at the top to the finest at the bottom—particles are classified by size with high accuracy. This reliable separation method makes the LMSM300/400 ideal for a wide range of materials, from fine powders to coarse granules.
How it works
The LMSM300/400 uses a robust electric motor to generate uniform, adjustable vibrations that drive the sieving process. Users can easily control vibration intensity and duration to suit specific material characteristics and testing standards. The machine supports a stack of standard test sieves, enabling multi-layer separation in a single run. With features like programmable settings, quiet operation, and a durable design, the LMSM300/400 ensures consistent, repeatable results with minimal sample loss. Whether used in quality control labs or production environments, this sieve shaker offers a user-friendly, low-maintenance solution for accurate particle size analysis across industries such as mining, construction, pharmaceuticals, and food processing.
Test Sieves
Laarmann offers a wide range of test sieves with precision woven wire, perforated plates or electroformed mesh. One of the many advantages of our sieves compared to those of other manufactures is the effective design that reducesses maintenace and cross contamination. The folded rim ensures a high stabilityfor laboratory and industrial applications besides having an optimum fitting accuracy when used in sieve stacks.
We supply test sieves with the following diameters: 8 inch / 12 inch / 200 / 300 / 315 / 350 / 400 / 450 mm.
test sieves can be ordered on our webshop
LMSM 300/450 Sieve Shaker FAQ (Frequently Asked Questions)
Applications
- Aggregates & construction materials: grading of sand and fine aggregates using larger sieve diameters for higher representativity.
- Mining & mineral processing: higher sample volumes for plant/lab comparison (e.g., crushed ore, concentrates, tailings sands).
- Bulk industrial minerals: limestone, silica, feldspar, gypsum—routine classification checks where larger throughput is needed.
- Recycling and circular materials: size classification of granulates (plastics, rubber, glass fines) for downstream separation steps.
- Process control / production QC: continuous or repeated sieve checks on production streams where you need faster turnaround and larger sample capacity.
- Wet sieving of cohesive materials: clays or materials that blind sieves—wet sieving helps break agglomerates and improves separation quality.