Filter cassette eliminates or substantially reduces contamination of filter media by extraneous material and facilitates handling

Burger, B. L.

Burr, J. C., Jr.

Fordyce, J. S.

King, R. B.

Rosenblum, L.

Toma, J.

English

NASA Technical Reports Server

t-oter Uassette 
July 1972	 B72-10379 
NASA TECH BRIEF 
Lewis Research Center	 A 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Filter Cassette For High Volume Air Sampler 
Rectangular	 Gasketed 
fl
A method has been devised for handling 8 x 10-inch 
(20.3 x 25.4 cm) filters for high volume air samplers to 
eliminate contamination during transportation, loading, 
and unloading. 
High volume air samples are typically deployed at a 
number of exposed outdoor locations, such as on top of 
buildings, to monitor air quality for pollution control 
purposes. The prior method of handling the filters in-
volved carrying them to the test site in a folder, removing 
them manually, and placing them by hand in the filter 
holder of the air sampler. After exposure, the filter was 
removed manually from the air sampler and placed in a 
folder for carrying to the laboratory. This procedure 
does not protect the filter from coming into contact 
with the hands or gloves of the handler, from blowing 
against adjacent structures, or from other sources of con-
tamination. Materials contacting the filter from such 
sources often invalidate the test data. This is particularly 
critical when the sampling is being done for trace metals
and compounds in the airborne particles. 
The innovation consists of a cassette for containing 
the filter. A rectangular bottom frame supports a screen 
grid. A gasketed rectangular upper frame fits snugly over 
the bottom frame. Two bolts with handles secure the 
parts together. In use, a piece of 8 x 10-inch filter media 
is placed on the screen grid between the rectangular 
frames and the frames fastened together in the labora-
tory. A clip-on cover protects the filter from pie-test 
exposure. A convenient carrier is used to transport the 
loaded cassettes to and from the test sites. At each test 
site, an exposed cassette is removed from the air sampler, 
covered and placed in the carrier, and an unexposed 
cassette is uncovered and placed in the air sampler. Thus 
the filter media is handled only under clean conditions 
in the laboratory. 
Use of the filter cassette eliminates or substantially 
reduces contamination of the filter media by extraneous 
material and facilitates handling in general. 
(continued overleaf) 
This document was prepared under the sponsorship of the National
	 Government assumes any Fiablify resu'ting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19720000378 2020-03-17T03:38:13+00:00Z
Note: 
No further documentation is available. Specific ques-
tions, however, may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B72-10379
Patent status: 
No patent action is contemplated by NASA. 
Source: R. B. King, J. S. Fordyce, 
L. Rosenblum, and J. Toma
Lewis Research Center, and 
J. C. Burr, Jr. of
Cleveland (Ohio) Division of Air Pollution 
Control, and
B. L. Burge, of
Environmental Protection Agency
(LEW-1 1469) 
72-10379	 Category 03


Filter cassette for high volume air sampler

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