Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1993-03-23
1994-08-02
Noland, Thomas P.
Measuring and testing
Sampler, sample handling, etc.
Capture device
7386301, 7386321, 7386325, 323299, 364496, G01N 124, G06F 1520
Patent
active
053335112
ABSTRACT:
A portable analyzer for obtaining samples from a monitored environment during different time intervals includes a pump energized by a rechargeable battery pack for drawing gas from the environment selectively into plural sample holding bags and an impact filter. The pump is programmed to control the time when the gas is drawn from the environment and for controlling the flow to the sample holders so that different ones of the sample holders are responsive to the materials at the same or different times. The pump may respond to electric pulses, causing pulses of air to be supplied to the sample holding bags. The pump derives pulses having a rate directly proportional to the number of pump cycles. The pump may also operate continuously with sampling of the gases being controlled electronically. Operation of the pump is prevented in response to the battery pack voltage dropping to a level such that the voltage is less than a predetermined value, necessary to provide a predetermined flow rate per pump cycle. Operation of the pump is also prevented if the gas flow rate drops below a predetermined level. These prevent features can be manually overridden.
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Boyum Gerald A.
Schweiss Jon W.
Noland Thomas P.
The United States of America as represented by the United States
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