Abstract: A DMMP vapor generator, system, and method includes a mixing chamber that receives heated air; at least one heating coil operatively connected to the mixing chamber, wherein the at least one heating coil receives liquid DMMP and uses the heated air to heat the liquid DMMP; a mist sprayer operatively connected to the mixing chamber, wherein the mist sprayer receives the heated liquid DMMP and atomizes the heated liquid DMMP into a DMMP aerosol; and a tube operatively connected to the mixing chamber, wherein the tube receives and vaporizes the DMMP aerosol. The DMMP vapor generator may further include a heater operatively connected to the tube, wherein the heater maintains a temperature in at least a portion of the tube to continue a steady vaporization of the DMMP aerosol. The heated air in the mixing chamber and in the at least a portion of the tube is approximately 195° F.

Abstract: A system for testing the efficiency of a test HEPA filter, the system comprises a dilution system and a sampling system. The dilution system processes samples collected upstream of the test HEPA filter. The dilution system has a test portion and a calibrated portion. The calibrated portion aids in determining the dilution ratio of the test portion thereby rendering the dilution system self-calibrating. The sampling system receives upstream samples via the dilution system, and downstream samples collected directly downstream of the test HEPA filter. The sampling system incorporates a flow rate balancing system to ensure accurate counts with respect to samples collected upstream and downstream of the test HEPA filter. The sampling system works well with particle counters fitted with relatively weak fans to draw in samples for counting; this is achieved by connecting the sampling system to both the inlet and exhaust outlet of a particle counter.

Abstract: A system for testing the efficiency of a test HEPA filter, the system comprises a dilution system and a sampling system. The dilution system processes samples collected upstream of the test HEPA filter. The dilution system has a test portion and a calibrated portion. The calibrated portion aids in determining the dilution ratio of the test portion thereby rendering the dilution system self-calibrating. The sampling system receives upstream samples via the dilution system, and downstream samples collected directly downstream of the test HEPA filter. The sampling system incorporates a flow rate balancing system to ensure accurate counts with respect to samples collected upstream and downstream of the test HEPA filter. The sampling system works well with particle counters fitted with relatively weak fans to draw in samples for counting; this is achieved by connecting the sampling system to both the inlet and exhaust outlet of a particle counter.