Model HVS3 - High Volume Small Surface Sampler
The High Volume Small Surface Sampler (HVS3) was developed by Envirometrics, Inc. and Engineering Plus, Inc. for the U.S. Environmental Protection Agency in order to collect samples of surface dust for measurement of the concentration of lead, pesticides and other toxics in the dust. The HVS3 weighs less than 30 pounds and is easy to use, clean, and ship. It can be conveniently carried by one person and fits in the trunk of a car. The HVS3 is made from aluminum and can be easily cleaned to the exacting QA/QC standards of pesticide, PCB and semi-volatile organics testing.
The HVS3 will collect a large, representative sample of dust from indoor surfaces such as rugs and bare floors, and dust from outdoor surfaces such as streets, sidewalks, lawn, and bare, packed dirt. A sample can be collected in 10 minutes that is large enough (10 to 200 g) for multiple chemical analyses and bioassays. It has been used to assess risks from lead, pesticides and other contaminants in house dust. Several articles on the use of the HVS3 are available.
The HVS3 maintains uniform sampling conditions by measuring and controlling the air flow and the pressure drop across a 5-inch nozzle. A 3-inch cyclone collects more than 99% of the average house dust. The cyclone catch cup can be used to transport the sample. A backup filter can be used behind the cyclone if desired.
The HVS4 has been developed for sampling programs where more convenience is necessary and accuracy in the dust-loading measurement is less important. The HVS4 is lighter and easier to handle. The results from using the HVS4 are comparable to but not exactly the same as the HVS3. It uses the same collection cyclone and suction velocity, so the size cuts are expected to be the same. Validation studies have not been completed on the HVS4.
A Standard Practice for collecting surface dust for chemical analysis using the HVS3 has been issued by ASTM. You may download a copy of ASTM Standard D-5438-94 from the ASTM website.
A copy of the HVS3 User's Manual, with a detailed description of the unit and the procedures for its use, is available for download (about 350 k). A copy of the draft HVS4 User's Manual is also available for download as a PDF file (about 1.3 M). A copy of the Adobe® Reader you need to view PDF files is available by clicking on the icon in the panel on the left.