Whole air sampler

Minor constituents play an important role in upper atmospheric photochemistry and serve as tracers in transport and mixing studies in tropospheric stratospheric exchange processes. Measurements of trace gases are essential to an understanding of the mechanisms by which minor constituents originating in the troposphere, both naturally occurring and anthropogenic, reach the stratosphere; data on tracer distributions thus acquired are important in the development of models for predicting photochemical effects in the stratosphere

Solid sorbent air sampler

A fluid sampler for collecting a plurality of discrete samples over separate time intervals is described. The sampler comprises a sample assembly having an inlet and a plurality of discreet sample tubes each of which has inlet and outlet sides. A multiport dual acting valve is provided in the sampler in order to sequentially pass air from the sample inlet into the selected sample tubes. The sample tubes extend longitudinally of the housing and are located about the outer periphery thereof so that upon removal of an enclosure cover, they are readily accessible for operation of the sampler in an analysis mode

Improved high volume air sampler

Sampler permits size separations of particles by directing sampled air through cross-sectional area sufficiently large that air velocity is reduced to point where particles or larger size will settle out. Sampler conducts air downward and through slots around periphery of unit into relatively open interior of house

Air sampler collects and protects minute particles

Air ejector impactor sampler collects and protects samples of particles greater than 0.1 micron in diameter. In operation, it causes impaction of particle-laden air onto several collection surfaces within a collection cylinder. When not operating, the collector cylinder is maintained in a retracted state within a protective envelope

Filter cassette for high volume air sampler

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

Filter-based Air Sampler Capable of Integration into Small Unmanned Aerial Vehicles [US 11619570 B1]

A filter-based air sampler, more specifically a filter-based air sampler capable of integration into small unmanned aerial systems is disclosed. The filter-based air sampler may include a filter assembly which has as its component parts: an open faced air intake component, a filter, and a filter support that has a central supporting grid. The filter assembly may joined to the housing of a fan, such as a centrifugal fan, with the supporting grid of the filter support being disposed over the air inlet of the fan

Copper emissions from a high volume air sampler

High volume air samplers (hi vols) are described which utilize a brush-type electric motor to power the fans used for pulling air through the filter. Anomalously high copper values were attributed to removal of copper from the commutator into the air stream due to arcing of the brushes and recirculation through the filter. Duplicate hi vols were set up under three operating conditions: (1) unmodified; (2) gasketed to prevent internal recirculation; and (3) gasketed and provided with a pipe to transport the motor exhaust some 20 feet away. The results of 5 days' operation demonstrate that hi vols can suddenly start emitting increased amounts of copper with no discernible operational indication, and that recirculation and capture on the filter can take place. Copper levels found with hi vols whose exhaust was discharged at a distance downwind were among the lowest found, and apparently provides a satisfactory solution to copper contamination

Collection efficiency of microbial methods used to monitor cleanrooms

Microbiological sampling methods used in pharmaceutical cleanrooms should efficiently collect and count microorganisms. Methods are described in this paper that allow collection efficiencies to be determined and maximised, and comparisons to be made between sampling methods

Airspora over Groundnut Fields at Kalamb

In the present investigation, a groundnut (Arachis hypogea L.) crop field was selected for the aerobiological study for two years. The systematic aerobiological survey was conducted by using volumetric Tilak air sampler (Tilak and Kulkarni – 1970) for a period of two rainy crop seasons and two summer crop seasons. In the present investigation, 71 airborne fungi were isolated and identified, of the 71 spore types, 41 spore types belong to Deuteromycetes, 17 to Ascomycetes, 4 to Basidiomycetes, 3 to Phycomycetes, and 6 to other types. The percentage contribution of each spore type to the total air spora of two seasons is calculated. Key words: Airspora, Arachis hypogea, aerobiology, Tilak air sampler D. S. Jadhav et al. Airspora over Groundnut Fields at Kalamb. J Phytol 2/12 (2010) 14-16