IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0038096
(2008-02-27)
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등록번호 |
US-8092744
(2012-01-10)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
2 인용 특허 :
12 |
초록
▼
A purge and trap concentrator system that includes a sparge vessel, and includes a variable gas flow valve for controlling the gas pressure in an analytic trap or the sparge vessel; a sensor that detects both a foaming sample state and a high liquid level in the sparge vessel, using one optical sens
A purge and trap concentrator system that includes a sparge vessel, and includes a variable gas flow valve for controlling the gas pressure in an analytic trap or the sparge vessel; a sensor that detects both a foaming sample state and a high liquid level in the sparge vessel, using one optical sensor; a control scheme that re-directs the purge gases to a second inlet of the sparge vessel during a foaming condition; a control scheme that uses a split flow to enhance the quantity of sample gases passed from an analytic trap; an electrically powered thermal energy source with a fan raising the sparge vessel temperature via thermal convection.
대표청구항
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1. An analytical chemical sampling apparatus, comprising: (a) a system controller programmed to output a plurality of control signals, and to receive at least one input sensing signal;(b) a source of gas, which provides a first gas;(c) a gas flow control valve that is controlled by a first control s
1. An analytical chemical sampling apparatus, comprising: (a) a system controller programmed to output a plurality of control signals, and to receive at least one input sensing signal;(b) a source of gas, which provides a first gas;(c) a gas flow control valve that is controlled by a first control signal of said plurality of control signals output by said system controller, said gas flow control valve having a first fluidic inlet and a first fluidic outlet which, under control of said first control signal, acts to pass a gas flow therethrough, said first fluidic inlet being in fluidic communication with said source of gas and receiving said first gas, said first fluidic outlet dispensing a second gas when required by said first control signal;(d) a plurality of fluidic control devices and a plurality of fluidic passages which fluidically connect said plurality of fluidic control devices, said second gas being directed into said plurality of fluidic control devices and a plurality of fluidic passages; and(e) a sparge vessel having a purge portion and a sample portion, (i) said purge portion of the sparge vessel having a second fluidic inlet that, during a sampling procedure, receives said second gas from said gas flow control valve, through said plurality of fluidic control devices and a plurality of fluidic passages;(ii) said sample portion of the sparge vessel being used to house a chemical sample during said sampling procedure, which allows volatile gases to be removed from said chemical sample and directed from said sparge vessel sample portion through a second fluidic outlet;(iii) said sample portion of the sparge vessel including a foam sensor that determines whether said chemical sample undergoes foaming; and(iv) said sample portion of the sparge vessel having a third fluidic inlet that, if said chemical sample undergoes foaming to an extent that the foaming is detected by said foam sensor which sends said at least one input sensing signal to said system controller, then under the control of a second control signal of said plurality of control signals output by said system controller, said plurality of fluidic control devices and a plurality of fluidic passages change state and re-direct said second gas such that it travels to said third fluidic inlet instead of to said second fluidic inlet, thereby allowing said sampling procedure to continue during a foaming state while temporarily bypassing said purge portion of the sparge vessel. 2. The analytical chemical sampling apparatus of claim 1, wherein said second control signal output by said system controller changes the state of a solenoid valve, one of said plurality of fluidic control devices, which re-directs said second gas from a first fluidic passageway to a second fluidic passageway, of said plurality of fluidic passages. 3. The analytical chemical sampling apparatus of claim 1, wherein said sample portion of the sparge vessel includes a foam bubble portion which is positioned at an elevation below that of said foam sensor, in which said foam bubble portion tends to reduce an amount of foaming of said chemical sample. 4. The analytical chemical sampling apparatus of claim 1, wherein: (a) said second fluidic outlet is positioned at a level above said chemical sample, (b) said third fluidic inlet is positioned at a level above said second fluidic outlet, and (c) if foaming is detected by said foam sensor, then said second gas travels from said third fluidic inlet to said second fluidic outlet of the sparge vessel without travelling through said chemical sample. 5. The analytical chemical sampling apparatus of claim 1, wherein said volatile gases removed from said chemical sample comprise volatile organic compositions (VOCs). 6. The analytical chemical sampling apparatus of claim 1, wherein said gas flow control valve comprises a variable position valve that exhibits a “low flow” mode in which its output gas flow is at a minimum amount, a “full flow” mode in which its output gas flow is at a maximum amount, and a “proportional flow” mode in which its output gas flow is at a value between said minimum amount and said maximum amount, under control of said first control signal. 7. The analytical chemical sampling apparatus of claim 6, wherein said variable position valve receives said first gas through said first fluidic inlet from said source of gas and, under control of said system controller, said variable position valve outputs through said first fluidic outlet a percentage of said first gas that is determined by a present position of said variable position valve. 8. The analytical chemical sampling apparatus of claim 6, wherein: (a) said low flow mode is a percentage of fluid flow that is substantially 0% of said maximum amount of fluid flow, (b) said full flow mode is a percentage of fluid flow that is substantially 100% of said maximum amount of fluid flow, and (c) said proportional flow mode is a percentage of fluid flow that varies between 0% and 100% of said maximum amount of fluid flow, through said variable position valve. 9. The analytical chemical sampling apparatus of claim 6, wherein said proportional valve is controlled by said first control signal in the form of an analog signal. 10. The analytical chemical sampling apparatus of claim 6, wherein said proportional valve is controlled by said first control signal in the form of a binary signal of multiple digits, thereby providing a large number of discrete possible positions. 11. The analytical chemical sampling apparatus of claim 6, wherein said system controller receives said at least one input sensing signal in the form of a closed loop feedback signal from a pressure sensor, and uses a P-I-D control routine to control said variable position valve. 12. The analytical chemical sampling apparatus of claim 6, further comprising a driver module that receives said first control signal in the form of a low power signal from said system controller, and generates a relatively high power signal that directly drives said variable position valve. 13. An analytical chemical sampling apparatus, comprising: (a) a system controller that is configured to output a first control signal and a second control signal;(b) a source of gas, which provides a first purge gas;(c) a gas flow control valve that is controlled by said first control signal, said gas flow control valve having a first fluidic inlet and a first fluidic outlet which, under control of said first control signal, acts to pass a gas flow therethrough, said first fluidic inlet being in fluidic communication with said source of gas and receiving said first purge gas, said first fluidic outlet dispensing a second purge gas when required by said first control signal;(d) a plurality of fluidic control devices and a plurality of fluidic passages which fluidically connect said plurality of fluidic control devices, said second purge gas being directed into said plurality of fluidic control devices and a plurality of fluidic passages; and(e) a sparge vessel having a purge portion and a sample portion, (i) said purge portion of the sparge vessel having a second fluidic inlet that, during a sampling procedure, receives said second purge gas from said gas flow control valve, through said plurality of fluidic control devices and a plurality of fluidic passages;(ii) said sample portion of the sparge vessel being used to house a chemical sample during said sampling procedure, which allows volatile gases to be removed from said chemical sample and directed from said sparge vessel sample portion through a second fluidic outlet;(iii) said sample portion of the sparge vessel including a frit that tends to disperse said second purge gas into many fine streams to increase surface contact of the second purge gas with said chemical sample for extraction of said volatile gases;(iv) said sample portion of the sparge vessel including a foam sensor that determines whether said chemical sample undergoes foaming; and(v) said sample portion of the sparge vessel having a third fluidic inlet that, if said chemical sample undergoes foaming to an extent that the foaming is detected by said foam sensor, then under the control of said second control signal, said plurality of fluidic control devices and a plurality of fluidic passages change state and re-direct said second purge gas such that it travels to said third fluidic inlet instead of to said second fluidic inlet, thereby allowing said sampling procedure to continue during a foaming state while temporarily bypassing said frit. 14. The analytical chemical sampling apparatus of claim 13, wherein said second control signal changes the state of a solenoid valve, one of said plurality of fluidic control devices, which re-directs said second purge gas from a first fluidic passageway to a second fluidic passageway, of said plurality of fluidic passages. 15. The analytical chemical sampling apparatus of claim 13, wherein said gas flow control valve comprises a variable position valve that exhibits a “low flow” mode in which its output gas flow is at a minimum amount, a “full flow” mode in which its output gas flow is at a maximum amount, and a “proportional flow” mode in which its output gas flow is at a value between said minimum amount and said maximum amount, under control of said first control signal. 16. The analytical chemical sampling apparatus of claim 13, wherein said sample portion of the sparge vessel includes a foam bubble portion which is positioned at an elevation below that of said foam sensor, in which said foam bubble portion tends to reduce an amount of foaming of said chemical sample. 17. The analytical chemical sampling apparatus of claim 13, wherein: (a) said second fluidic outlet is positioned at a level above said chemical sample, (b) said third fluidic inlet is positioned at a level above said frit, and (c) if foaming is detected by said foam sensor, then said second purge gas travels from said third fluidic inlet to said second fluidic outlet of the sparge vessel without travelling through said frit.
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