A sampler for "total dust", exhibiting inspirability characteristics similar to the human head, has a filter unit containing a filter. The capsule has a lipped entry which protrudes through an aperture in a sampling head. The sampling head is connectd to suction elements for drawing an atmosphere through the filter unit and is capable of being continuously rotated.
An air sampler is described which appears to be nothing more than a bulletin board or the like. The air sampler is contained within a housing and has a pair of air sampling cassettes positioned therein which sample the air surrounding the air sampler.
A self sealing air sampling apparatus includes a body with a filter therein and an air moving device, such as a fan, mounted therein for moving air through the filter. There is an air inlet communicating with the filter. There is also a air outlet communicating with the filter. A manually operable control simultaneously opens the air inlet and the air outlet and operates the air moving device for moving air from the air inlet, through the filter and out through the air outlet. For example, the body may be cylindrical and have a cylindrical shell rotatably mounted thereon. The shell and the body have air inlet openings and air outlet openings which are aligned when the shell is rotated in one direction and become unaligned when the shell is rotated in an opposite direction thus sealing off the filter compartment from the outside environment. Rotation of the shell also closes a switch to operate the fan when the shell is rotated in the one direction.
A device and method for counting particles on a sample surface. The device includes a scanner having a surface for interfacing with the sample surface. The scanner is connected to one end of a tube which has two canals. The other end of the tube is connected to the particle counter. One of the tube canals supplies air from the particle counter through holes in the scanner surface for dislodging and fluidizing particles on the sample surface. The other tube canal returns air with the sample surface particles to the particle counter. After the particles are counted they are removed from the air stream by a filter. The air is then recycled back through the supply canal of the tube to facilitate additional particle counting. The method for using the device involves passing the scanner over the sample surface for predetermined periods, and collecting, counting and computing the average relative number of particles per unit area.
