Portable, sequential air sampler
First Claim
1. A portable, sequential air sampler, said air sampler comprising:
- a housing, said housing being made of a plurality of sections;
means located within one of said sections for sequentially drawing air to be sampled through a plurality of individual air sampling media;
means located in said one section operably connected to said air drawing means for maintaining the flow rate through each of said plurality of air sampling media to within approximately 1% of a preset flow rate under varying external conditions of temperature and pressure, said flow rate maintaining means including means operably connected to said air drawing means for providing a first signal indicative of flow rate change and utilizing said first signal to provide a second signal, said second signal being utilized by said air drawing means to control said air drawing means so as to maintain said flow rate through said air sampling media to within approximatly 1% of said preset flow rate;
means located within another one of said sections for selectively providing either AC or DC power to said air drawing means and said flow rate maintaining means; and
an accessible panel having means for interconnecting said plurality of air sampling media to said air drawing means and means to control as well as to visually indicate various stages of operation of said air sampler.
1 Assignment
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Accused Products
Abstract
A portable, sequential air sampler having an easily transportable housing containing therein a plurality of interrelated components which allow the air sampler to operate by either battery or "line" power as well as maintain the flow rate through the sampling media substantially constant. The components include a vacuum pump and rotary valve which are capable of sequentially drawing air through the sampling media. In addition, a flow rate control system is operably connected to the vacuum pump in order to maintain the substantially constant flow rate through the sampling media. The air sampler can vary initiation of the sampling operation from 1-999 minutes while varying the sequence of sampling from 1-99 minutes, and, yet, maintai substantially constant air flow throughout the air sampling procedure.
43 Citations
9 Claims
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1. A portable, sequential air sampler, said air sampler comprising:
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a housing, said housing being made of a plurality of sections; means located within one of said sections for sequentially drawing air to be sampled through a plurality of individual air sampling media; means located in said one section operably connected to said air drawing means for maintaining the flow rate through each of said plurality of air sampling media to within approximately 1% of a preset flow rate under varying external conditions of temperature and pressure, said flow rate maintaining means including means operably connected to said air drawing means for providing a first signal indicative of flow rate change and utilizing said first signal to provide a second signal, said second signal being utilized by said air drawing means to control said air drawing means so as to maintain said flow rate through said air sampling media to within approximatly 1% of said preset flow rate; means located within another one of said sections for selectively providing either AC or DC power to said air drawing means and said flow rate maintaining means; and an accessible panel having means for interconnecting said plurality of air sampling media to said air drawing means and means to control as well as to visually indicate various stages of operation of said air sampler. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification