Size Analyzers

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Visual-Accumulation Tube Sand Size Analyzer, US VATSA-99

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The US VATSA-99 is a laboratory instrument for the simple and rapid determination of the size frequency distribution of sediment samples containing particles from 62 microns to 2 millimeters. The instrument records results in terms of the fall velocity of the individual particles of the sample. The US VATSA-99 is a redesigned and updated version of the VATSA-53. Many obsolete components have been replaced and the operation has been greatly improved over the original US VATSA-53.

The analyzer consists of a glass sedimentation tube, a valve mechanism and a recorder. The lower end of the glass sedimentation tube is reduced in diameter to facilitate measurement of accumulated sediment. Tubes 120 cm. long are furnished in four sizes with the lower end reduced to 2.1, 3.4, 5.0, and 7.0 mm inside diameter respectively. These tubes are for analyzing sands up to 1 mm in size. One of each of these four sizes are furnished with the analyzer. A tube 180 cm long may also be used for analysis of sands up to 2 mm in size. Selection of the tube to be used is based on the quantity and size of material available in the sample to be analyzed. The 180 cm tube and accessories are not furnished as part of the analyzer. The accessories for the 180 cm tube may be obtained on special order.

To make an analysis, the sample is introduced into the top of the tube. The particles are separated in size as they fall through the water in the tube. As the sediment accumulates in the settling section of the tube, the height of the column is followed manually and a grain size curve is automatically and simultaneously traced on a chart. The percent finer of each particle size classification in the sample is analyzed and may be read from this graph. A supply of 200 charts is furnished with the analyzer. The US Vasta-99 is available in 120V, 60Hz, or 240V, 50Hz power supply.

503-155 US VATSA-99, 120V 90 lbs.

503-160 US VATSA-99, 240V 90 lbs.

503-175 Sedimentation tube (120 cm) 2.1mm 22 lbs.

503-176 Sedimentation tube (120 cm) 3.4mm 22 lbs.

503-177 Sedimentation tube (120 cm) 5.0mm 22 lbs.

503-178 Sedimentation tube (120 cm) 7.0mm 22 lbs.

503-179 180 cm Sedimentation tube (tube only) 34 lbs.

503-180 180 cm Sedimentation tube w/ accessories 38 lbs.

503-181 Charts (additional) 100 per package 1 lb.