Human portable preconcentrator system

A portable flow-through preconcentrator system for collecting and analyzing particles entrained in a gas stream, the system comprising:

• a main body including a plenum, a first port through which gas with entrained particles can pass from a region outside of the body in to the plenum, a second port and a third port,
• a fan adapted to draw gases through the plenum and second port,
• at least one pervious screen to collect the particles when the pervious screen is disposed in a first position across the second port and the gases are drawn through the second port by the fan,
• means for repositioning the at least one pervious screen from the first position to a second position disposed across the third port, and
• a chemical detector adapted to draw gases from the plenum through the third port when the pervious screen is disposed in the second position across the third port and to perform chemical analysis of those gases.

A portable flow-through preconcentrator apparatus for collecting particles entrained in a gas stream, the apparatus comprising:

• a main body including a plenum, a first port through which gas with entrained particles can pass from a region outside of the body in to the plenum, a second port and a third port,
• a fan adapted to draw gases through the plenum and second port,
• at least one pervious screen to collect the particles when the pervious screen is disposed in a first position across the second port and the gases are drawn through the second port by the fan,
• means for repositioning the at least one pervious screen from the first position to a second position disposed across the third port, wherein the repositioning means comprises a slip ring or rotatable hinge, and
• a connector adapted to permit joining the third port to a separate chemical detector.

A portable flow-through preconcentrator system for collecting and analyzing particles entrained in a gas stream, the system comprising:

• a main body including a plenum, a first port through which gas with entrained particles can pass from a region outside of the body in to the plenum, a second port and a third port,
• a fan adapted to draw gases through the plenum and second port,
• at least one pervious screen to collect the particles when the pervious screen is disposed in a first position across the second port and the gases are drawn through the second port by the fan,
• means for repositioning the at least one pervious screen from the first position to a second position disposed across the third port, wherein the repositioning means comprises a slip ring or rotatable hinge, and
• a chemical detector adapted to draw gases from the plenum through the third port when the pervious screen is disposed in the second position across the third port and to perform chemical analysis of those gases.