Say what? Your laboratory needs to meet certain noise level requirements to promote a safe workplace environment for your employees. High noise levels can lead to many health issues, which is why the government closely regulates sound. But how can you maintain the standards for safety and still practice productive testing when almost all lab equipment makes noise? Take a deep breath, remove your ear plugs and read on because we’ll outline compliant and noise reducing machines that will make testing procedures such as particle separations, much quieter.
The problem with noise
Particle separation by sieving is a physical event that requires movement and reorientation of particles for accurate size determinations of materials. Materials can be divided into aggregates of finer and coarser materials. While accuracy is great, the noise created by these actions is not ideal for the health of your employees, nor does it help you meet the stringent noise level requirements.
Lab technicians and engineers turn to mechanical sieve shakers to separate aggregates and other materials, but these often use tapping actions that, combined with the noise of the mechanism, can produce high noise levels.
There are a number sieve shakers that can help manage sound levels. If the noise of the sieve shaker mechanism can be controlled, the overall noise of the particle separation can also be controlled.
Traditionally, ordinary rotary sifters have been inherently noisy from rotation of the sieve stack and the tapping mechanism. Recent design advances now employ sound-deadening materials and proprietary techniques to significantly reduce noise levels.
Rotary sifters with up-to-date design can now be a solid choice to control noise. Their traditional action of continuous rotation aided by tapping to assist passage of fines is widely accepted, and the improvements in noise control make them even more useful in maintaining a safer environment in the lab.
- We recommend our line of Silent Sifters®; Rotary sifters that incorporate the latest technology to control noise output without sacrificing sieve accuracy and efficiency. The SS-21 Silent Sifter® is 7-10dB quieter. Our newest SS-22 Silent Sifter® II is 15-20dB quieter than traditional sifters and 8-10dB quieter yet than the SS-21.
Vibratory sieve shakers
Vibratory shakers can also be relatively quiet during operation. They use electromagnetic energy to agitate particles without the harsh noises of a mechanical device. An optimum setting creates a fluid bed of material across the sieve, lifting and reorienting particles to ensure the maximum number of passing opportunities.
- We recommend the Gilson line of Vibratory Sifters. The SS-10 1-Touch Vibratory Sieve Shaker is not only quieter compared to other models, but it also provides manageable user-control with a touch-screen programmable display that allows you to select the level of vibration, time and pauses.
The SS-3 Performer III 3in Sieve Shaker is compact, quiet and efficient with electromagnetic vibratory and switchable tapping actions. It also includes precise digital timing and 0-100% amplitude control.
Other noise-reducing features
Enclosures with sound-deadening linings can also control decibel levels for any shaker.
- We recommend the Gilson TSA-180 Sound Enclosure. The sturdy steel case is lined with 1” sound-deadening foam, allowing for quiet operation of Gilson’s Test Screens and Sieve Shakers. The apparatus also features hinged doors for easy access to testing screens and other equipment.
And there you have it. It’s important to manage noise levels not only to meet industry requirements, but also to protect your employees. If you are looking for a recent blog series we've completed on laboratory noise, check out our two part series featuring a blog on limiting laboratory noise and a blog on managing laboratory dust.
For more information about noise-reducing practices and equipment, call us at 800.444.1508.