Measuring and testing – Sampler – sample handling – etc. – With constituent separation
Patent
1997-10-31
1998-11-03
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
With constituent separation
G01N 122
Patent
active
058311823
ABSTRACT:
A remote slit impact air sampler for recovering viable air borne organisms from a known volume of ambient air. The remote sampler is employed with a sealed sample chamber within which a test plate upon a turntable is rotated beneath a slit type sample inlet. During operation, air passing through the sample slit is accelerated to a velocity that insures impingement of particulate matter from the sampled air volume onto the surface of a nutrient growth medium located within the test plate. Particulate matter and associated bacterial organisms within the sampled air volume are retained upon the surface of the test plate while the sampled air volume is evacuated from the sample chamber through an air outlet, and is then exhausted away from the critical environment at the controller means. Following sampling, the test plate is incubated for a predetermined period of time following which bacterial colony forming units may be quantified. As the volume of air sampled per period of time is known, the density of bacterial organisms per volume of air can then be determined. Moreover, as the rotational speed of the turntable is known, the time of organismal capture may also be determined. The remote sampler is employed with streamline structure allowing it to be placed and operated in a variety of controlled environments, while having negligible disruptive effects on laminar airflow or operations performed therein. Also, the base, below the sealed sample chamber, housing turntable elevation and rotational means, is employed with means to seal its interior from the external environment in a substantially air tight manner, whereby disallowing contaminant ingress and egress which might jeopardize the environment in which it is utilized. Further, the device is constructed of substantially non-particulate shedding or harboring materials that allow for complete routine chemical sanitization with negligible degradation. Additionally, the device utilizes standard 100 mm test plates to greatly reduce the cost of operation.
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"Sampling Microbiological Aerosols", Public Health Monograph No. 60, Apr. 1959, Pages/Sampler: 20 & 36/Fort Detrick Slit, 20 & 35/TDL, 21 & 37 Fort Detrick Slit-Incubator, 21 & 38/Casella (Slit).
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