The New PT-SV110 Scott Volumeter

The PT-SV110 is applicable to powders including metal powders, compounds, pigments, and so on that will flow freely through a suitable nozzle.

A comparison of the bulk and tapped densities of powders can give an indication of the type of interaction present between the various particles building up in the powder mass and hence provide an index of powder flowability, e.g., the Hausner ratio and compressibility index.

Operating Principle

The operating principle relies on the measurement of a mass of a certain quantity of powder which fills a container of a known volume inside the PT-SV110. A loose packing condition is obtained by using the PT-SV110 and this is achieved by filling a stainless steel cup or container by cascading the powder sample over a series of inclined glass baffles within a baffle box. The ratio between the mass and the volume represents the apparent density.

The PT-SV110 is easy to use. First weigh then place the stainless steel cup onto the base of the unit. Then carefully pour the powder into the funnel at the top of the baffle box until the cup beneath overflows. Now level off the powder using a flat edge scraper.

Re-weigh the cup and calculate the weight of the collected powder sample. Now use the known volume of the cup to calculate the apparent density. This can be done using the formula: ? = M/V

Where ? is the density, M = mass in grams and V = volume of the receiving cup in mL. The result is expressed in g/mL.

Setup of the PT-SV110 Instrument
The instrument design consists of a solid baseplate, a stand to carry the funnel and baffle box, a stainless steel receiving cup. The height of the funnel and of the baffle box can be adjusted freely up and down and locked into place without a risk of twisting and without using any tools. After a test the baffle box can be swiveled to this side to allow easy access to the receiving cup.

The instrument includes a powder collecting tray, which can be easily removed for cleaning. The base plate with integrated spirit level can be adjusted via three points to ensure a level installation. A suitable balance is required to calculate the apparent density.

Result Reporting
Usually there should be a series of at least three tests to provide a basic statistical set of results and to avoid any sample anomalies. Samples should be of a uniform nature and as such should be representatively sampled. This can be achieved by coning and quartering or by the use of suitable riffling device, either electronic or manual. When the test is finished you need to prepare a test report which should include product descriptive information such as batch number, specification, method of drying (if it has been dried).