Ronnie Brown

By: Ronnie Brown on July 2nd, 2021

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What Is a RO-TAP® RX-812 Sieve Shaker? (Definition, Operation, Cost)

Ro-Tap Sieve Shakers



In the world of particle size analysis, test sieve analysis is possibly the oldest method of testing the size and consistency of the particles of a product. As time went on, technology gradually started playing a more significant role in gathering accurate and repeatable results.

This leaves lab technicians responsible for incorporating equipment, such as sieve shakers, to ensure their test sieve analysis operation is as efficient as possible. But with so many sieve shaker variants, such as the W.S. Tyler RO-TAP® RX-812, it’s essential to know how each one differs.

So, what exactly is a RO-TAP RX-812?

W.S. Tyler has manufactured various RO-TAP Sieve Shaker models since the 1930s and is here to help you determine what sieve shaker will deliver the best results for your operation.

To that end, this article will encompass:

  • What a RO-TAP RX-812 is
  • How the RO-TAP RX-812 works
  • What Sieves can be used with the RO-TAP RX-812
  • How to set up the RO-TAP RX-812
  • The required maintenance you should look out for
  • How much the RO-TAP RX-812 costs


What Is a RO-TAP RX-812 Sieve Shaker?

The W.S. Tyler RO-TAP RX-812 is a mechanical sieve shaker that is simply orbital. This means that, unlike the standard RO-TAP RX29, these devices rely on a circular motion with no tapping mechanism to promote particle movement through a sieve stack.

Having said that, the RO-TAP RX-812 is designed to analyze particles that are 100 mesh and larger. This is because particles this large don’t require the tapping hammer motion of the RX29 to be broken up.

RO-TAP-RX-812Unit Dimensions

Footprint: 23" wide x 15" deep x 31.5" high (59cm x 38cm x 80cm) 

Weight: 55 lbs. (25 kg)

Shipping Footprint: 25" wide x 19" deep x 15" high (64cm x 49cm x 38cm)

Shipping Weight: 95 lbs. (28 kg)


How Does the RO-TAP RX-812 Work?

As stated above, the RO-TAP RX-812 mechanical sieve shaker facilities the test sieve analysis process using orbital motion. This orbital motion is carried out using a timing belt and motor, similar to what drives the oscillating motion of other RO-TAP devices.

Additionally, it has the same digital timer as the RO-TAP RX29/RX30, providing lab technicians the ability to set the device to run for up to 99 minutes.


What Sieves Can I Use With the RO-TAP RX-812?

The amount of sieves you can place in a stack depends on whether the sieves are half-height or full-height. When working with 8-inch sieves, the RO-TAP RX-812 can hold six full-height sieves or 13 half-height sieves.

On the other hand, when working with 12-inch sieves, the RO-TAP RX-812 can hold four full-height sieves, six half-height sieves when a full height pan is used, or eight half-height sieves when a half-height pan is used.

To that end, the RO-TAP RX-812 comes with an adapter that makes switching from 8-inch diameter sieves to 12-inch diameter sieves seamless.

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What Initial Setup Is Required?

When a W.S. Tyler RO-TAP RX-812 arrives at your facility, minimal setup is required. In fact, setting up the RX-812 is a simple as plugging the device into an adequate power source, placing your sieves into the sieve housing, securing the sieve stack by fastening the lid, setting the timer, and pressing the start button.

Having said that, because it does have the heavy metal used for all RO-TAP devices, you will want to make sure it is placed onto a steady, secured table or on the floor. This will help to reduce the chance of injury.


What Maintenance Is Typically Required?

With the RX-812, there aren’t as many moving parts as other RO-TAP devices. The parts that are more likely to wear first are the timing belt, the single brass bushing that is used, and the eccentric disc.

Having said that, lab technicians tend to get used to the sound of the sieve shaker, no matter what model it is, and can often hear when something is wrong. If you notice your device requires maintenance, you can either refer to the manual or reach out to our team of experts.

NOTE: As the orbiting motion isn’t as harsh as the tapping and oscillating motion of the RO-TAP RX29, the moving parts of the RX-812 take much longer to wear to a dysfunctional state.


How Much Does the RO-TAP RX-812 Cost?

The RO-TAP RX-812 is W.S. Tyler’s least expensive unit. You can expect to pay around $1,731.99 for each unit.

The price of the overall order, however, will vary based on if you need test sieves.

NOTE: Despite which RO-TAP device you select, test sieves are sold separately. For more information on what you can expect to pay for a stack of sieves, read the article: How Much Does a Test Sieve Cost? (Factors and Price Ranges + Video).

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Design the Best Possible Setup To Yield Ideal Test Sieve Analysis Results

The W.S. Tyler RO-TAP RX-812 is a mechanical sieve shaker that relies on a singular orbiting motion to ensure sample material passes through a stack of sieves. Standing as the cheapest RO-TAP model, the RX-812 is the ideal sieve shaker for operations that work with particles 100 and larger.

But to ensure you can consistently yield accurate and repeatable results, you must ensure your lab is furnished with the right equipment. This will help to ensure each aspect of your test sieve analysis, from gathering reliable sample material to weighing how much material each sieve retained, is done with the utmost accuracy.

Having been a prominent particle size analysis leader for over 140 years, W.S. Tyler strives to help lab technicians fine-tune their operations and achieve the best possible results.

To learn more about what equipment your test sieve analysis lab should have, review the following article:

About Ronnie Brown

Ronnie is the Content Writer for W.S. Tyler and has four years of experience as a professional writer. He strives to expand his knowledge on all things particle analysis and woven wire mesh to leverage his exceptional writing and graphic design skills, creating a one-of-a-kind experience for customers.