Adjustable air sampler for pathogens and psychrometrics

Abstract

An adjustable air sampler device and method for collecting airborne pathogens and psychrometric data for room or remote air samples wherein the sample volume is electronically controlled. Particulates in the air are caused to impact the surface of the growth/inhibitor media contained in the pathogen dish thereby depositing pathogenic microorganisms in the media. The growth/inhibitor media may be a solid, liquid, gel, or mixture thereof. After the pathogen dish is incubated, colony forming units are counted for determination of air quality parameters. A chip-based sensor measures psychrometric properties of the air sample.

What is claimed is:  
     
         1 . An adjustable and portable air sampling apparatus for collecting airborne pathogens and psychrometric data comprising; 
 a base,    a casing removably disposed on said base, said casing having at least one top air inlet and a plurality of side air outlets and a sample chamber disposed between said inlet, outlets, and base.    at least one pathogen dish removably disposed on said casing above said top air inlet and generally transverse to said top air inlet airflow path,    a cap removably disposed on said casing, said cap at least partially enclosing said pathogen dish,    a perforated impact plate removably disposed on said cap, said plate having at least one perforated size pattern selectively activated by the user,    a printed circuit board removably disposed on said base inside said sample chamber,    a fan removably disposed on said casing and inside said sample chamber,    a means for controlling said fan,    a means for measuring psychrometric data inside said sample chamber, and    a means for communicating with an external data acquisition and control system.    
     
     
         2 . The apparatus of  claim 1  wherein said perforated impact plate comprises a single plate with multiple perforation sizes arranged so that selectable patterns of perforation sizes can be activated.  
     
     
         3 . The apparatus of  claim 1  wherein said perforated impact plate comprises multiple plates, each plate having preselected perforation sizes and patterns wherein at least one individual plate portion can be selectively activated.  
     
     
         4 . The apparatus of  claim 1  wherein said pathogen dish comprises a growth/inhibitor media selected from at least one of the group consisting of distilled water, pure water, agar and mixtures thereof.  
     
     
         5 . The apparatus of  claim 1  wherein said removable perforated impact plate is disposed at a preselected distance from said pathogen dish of between approximately 0 to 6 inches.  
     
     
         6 . The apparatus of  claim 1  wherein said pathogen dish is disposed at a preselected distance from said air outlets of between approximately 0 to 12 inches.  
     
     
         7 . The apparatus of  claim 1  wherein said pathogen dish is disposed at a preselected distance from said air inlet of between approximately 0 to 6 inches.  
     
     
         8 . The apparatus of  claim 1  wherein said fan is disposed at a preselected distance from said air inlet of between approximately 0 to 6 inches.  
     
     
         9 . The apparatus of  claim 1  wherein said the effective outside diameter of said impact plate is adjustable to a preselected distance of between approximately 0 to 6 inches.  
     
     
         10 . The apparatus of  claim 1  wherein the largest outside dimension of said adjustable sampler is between approximately 0 to 8 inches.  
     
     
         11 . The apparatus of  claim 1  wherein said cap further comprises a remote collection assembly having a remote sampler head, a remote sensor assembly, and interconnecting tubing.  
     
     
         12 . The apparatus of  claim 1  wherein said printed circuit board further comprises an electrical plug for supplying alternating or direct current directly to said circuit board or to rechargeable batteries.  
     
     
         13 . The apparatus of  claim 1  wherein said means for controlling said fan comprises electrical power having a voltage between approximately 0 to 120 volts.  
     
     
         14 . The apparatus of  claim 1  wherein said means for controlling said fan comprises electrical power having a frequency between approximately 0 to 60 hertz.  
     
     
         15 . The apparatus of  claim 1  wherein said means for controlling said fan comprises an electrical power source selected from at least one of the group consisting of line voltage, battery, solar and electronic motor controller.  
     
     
         16 . The apparatus of  claim 1  wherein said means for controlling said fan comprises an electronic component on said circuit board that maintains fan speed for a preselected run time.  
     
     
         17 . The apparatus of  claim 1  wherein said means for measuring psychrometric data comprises an electronic component on said circuit board that senses, stores, and displays relative humidity, absolute humidity, and dry bulb temperature of the air in said sample chamber.  
     
     
         18 . The apparatus of  claim 1  wherein said means for communicating with an external data acquisition and control system comprises a two-way network selected from the group consisting of wired and wireless.  
     
     
         19 . The apparatus of  claim 1  wherein said fan is a type selected from the group consisting of axial, centrifugal, and tubular.  
     
     
         20 . An air sampling method comprising the steps of: 
 adjusting the impact plate to activate a preselected perforation size and pattern,    starting the adjustable sampler fan, either manually or automatically, with a means for controlling said sampler fan,    impacting said air sample on a cap having a pathogen dish, said pathogen dish further comprising a growth/inhibitor media,    measuring the psychrometric properties of said air sample with a means for measuring psychrometric data located on a printed circuit board inside the sample chamber,    communicating said psychrometric properties with a data acquisition and control system,    removing said pathogen dish from the sampler,    incubating said pathogen dish for a preselected time period in a controlled environment, and    counting the colony forming units in the growth/inhibitor media.    
     
     
         21 . The method of  claim 20  wherein said perforated impact plate comprises a single plate with multiple perforation sizes arranged such that selectable patterns of perforation sizes can be activated.  
     
     
         22 . The method of  claim 20  wherein said perforated impact plate comprises multiple plates, each plate having preselected perforation sizes and patterns wherein an individual plate or a combination of plates can be selectively activated.  
     
     
         23 . The method of  claim 20  wherein said pathogen dish comprises a growth/inhibitor media selected from at least one of the group consisting of distilled water, pure water, agar and mixtures thereof.  
     
     
         24 . The method of  claim 20  wherein said removable perforated impact plate is disposed at a preselected distance from said pathogen dish of between approximately 0 to 6 inches.  
     
     
         25 . The method of  claim 20  wherein said pathogen dish is disposed at a preselected distance from said air outlets of between approximately 0 to 12 inches.  
     
     
         26 . The method of  claim 20  wherein said pathogen dish is disposed at a preselected distance from said air inlet of between approximately 0 to 6 inches.  
     
     
         27 . The method of  claim 20  wherein said fan is disposed at a preselected distance from said air inlet of between approximately 0 to 6 inches.  
     
     
         28 . The method of  claim 20  wherein said the effective outside diameter of said impact plate is adjustable to a preselected distance of between approximately 0 to 6 inches.  
     
     
         29 . The method of  claim 20  wherein largest outside dimension of said adjustable sampler is between approximately 0 to 8 inches.  
     
     
         30 . The method of  claim 20  wherein said cap further comprises a remote collection assembly having a remote sampler head, a remote sensor assembly, and interconnecting tubing.  
     
     
         31 . The method of  claim 20  wherein said printed circuit board further comprises an electrical plug for supplying alternating or direct current directly to said circuit board or to rechargeable batteries.  
     
     
         32 . The method of  claim 20  wherein said means for controlling said fan comprises electrical power having a voltage between approximately 0 to 120 volts.  
     
     
         33 . The method of  claim 20  wherein said means for controlling said fan comprises electrical power having a frequency between approximately 0 to 60 hertz.  
     
     
         34 . The method of  claim 20  wherein said means for controlling said fan comprises an electrical power source selected from at least one of the group consisting of line voltage, battery, solar and electronic motor controller.  
     
     
         35 . The method of  claim 20  wherein said means for controlling said fan comprises an electronic component on said circuit board that maintains fan speed for a preselected run time.  
     
     
         36 . The method of  claim 20  wherein said means for measuring psychrometric data comprises an electronic component on said circuit board that senses, stores, and displays relative humidity, absolute humidity, and dry bulb temperature of the air in said sample chamber.  
     
     
         37 . The method of  claim 20  wherein said means for communicating with an external data acquisition and control system comprises a wireless network selected from the group consisting of wired and wireless.  
     
     
         38 . The method of  claim 20  wherein said fan is a type selected from the group consisting of axial, centrifugal, and tubular.