Measuring and testing – Measuring vessel
Patent
1975-05-05
1976-05-18
Swisher, S. Clement
Measuring and testing
Measuring vessel
73 28, G01N 122
Patent
active
039569403
ABSTRACT:
A sampler including a pump unit and a holder for an adsorbent for the pollutants both carried by the personnel while in the area under observation, typically during an 8-hour working period. The pump unit includes a motor-driven pump which draws the air breathed by the personnel through the adsorbent while the personnel is in the area. The unit includes a counter for counting the revolutions of the motor as a measure of the air being drawn. At the end of the working period, the adsorbent is desorbed and the quantity of pollutants determined. This apparatus is of very low power so that it can be carried without discomfort for a working day, and low quantities of air are pumped. High efficiency and low leakage is achieved with a unique pump. The pump includes a plenum whose pressure is varied by flexing a thin membrane. The flow of air to and from the plenum is controlled by unique valves, an outlet valve connected to the plenum and an intake valve to the adsorbents. Each valve includes a plate having an opening in air-flow communication with the plenum with a protuberance around the hole on one face of the plate. A thin strip of resilient material is stretched over the hole engaging the protuberance. When the pressure in the plenum is increased by flexing the membrane, so as to reduce the volume of the plenum, the valve connected to the plenum is opened, exhausting the air producing the excess pressure and the valve connected to the adsorbents closed. When the membrane is flexed in the opposite direction, the pressure in the plenum is reduced, the valve connected to the plenum is closed, and the valve connected to the adsorbent is opened, and contaminated air is drawn through the adsorbent.
REFERENCES:
patent: 1321062 (1919-11-01), Lamb et al.
patent: 1621498 (1927-03-01), Drager
patent: 2707074 (1955-04-01), Tussey
patent: 2809589 (1957-10-01), Randolph
patent: 3093001 (1963-06-01), Williams
patent: 3410059 (1968-11-01), Garnier
patent: 3802250 (1974-04-01), Garnier
Diamond Hymen
Swisher S. Clement
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