IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0013842
(2001-12-13)
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발명자
/ 주소 |
- Lilienthal, Scott Edward
- Barden, James
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출원인 / 주소 |
- ITT Manufacuring Enterprises, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
4 인용 특허 :
7 |
초록
▼
A back flushable sample probe includes a hollow fitting securable to a fluid supply source and a strainer assembly disposed within the fitting. The strainer assembly includes a movable first member and a second member secured within the fitting. The first member is movable to contact the second memb
A back flushable sample probe includes a hollow fitting securable to a fluid supply source and a strainer assembly disposed within the fitting. The strainer assembly includes a movable first member and a second member secured within the fitting. The first member is movable to contact the second member and form a strainer at the engaging surface between, the first and second members, where the strainer permits a fluid sample to flow through the engaging surface but prevents debris entrained in the fluid to pass therethrough. During back flushing of the sample probe, the first member disengages from the second member, causing any debris accumulated at the engaging interface to be removed from the sample probe.
대표청구항
▼
A back flushable sample probe includes a hollow fitting securable to a fluid supply source and a strainer assembly disposed within the fitting. The strainer assembly includes a movable first member and a second member secured within the fitting. The first member is movable to contact the second memb
A back flushable sample probe includes a hollow fitting securable to a fluid supply source and a strainer assembly disposed within the fitting. The strainer assembly includes a movable first member and a second member secured within the fitting. The first member is movable to contact the second member and form a strainer at the engaging surface between, the first and second members, where the strainer permits a fluid sample to flow through the engaging surface but prevents debris entrained in the fluid to pass therethrough. During back flushing of the sample probe, the first member disengages from the second member, causing any debris accumulated at the engaging interface to be removed from the sample probe. the block past which the gas being analyzed flows, a valve mounted to the block, said valve having a closed position, a sample gas position, and a calibration gas position, a first passageway in the block extending from the calibration gas inlet orifice through the valve and past the detection cell to the gas outlet, a second passageway in the block extending from the sample gas inlet orifice through the valve and past the detection cell to the gas outlet, and said sample gas inlet orifice being positioned along the second passageway upstream of the valve, and a third passageway in the block including a bypass orifice downstream of the sample gas inlet orifice, said third passageway being in communication with the gas outlet while sample gas is being introduced through the sample gas inlet orifice when the valve is in the sample gas position, enabling at least a portion of the sample gas to flow through the third passageway and exit the gas outlet, said orifices being sized so that, with gas entering the instrument at an inlet orifice pressure within a predetermined range, the flow rate of gas through the instrument is within a predetermined range. 2. The instrument of claim 1 where the predetermined inlet orifice pressure range is from 1 to 100 pounds per square inch gage. 3. The instrument of claim 1 where the predetermined flow rate range is from 0.5 to 7 standard cubic feet per hour. 4. The instrument of claim 1 where the orifices have an area from 0.00001 to 0.0005 square inch. 5. The instrument of claim 4 where the orifices are substantially circular and have a diameter from 0.004 to 0.022 inch. 6. An instrument for analyzing a gas that is at a variable pressure elevated above atmospheric pressure, said gas flowing through the instrument to exit the instrument via a gas outlet at atmospheric pressure, said instrument comprising a block having a sample gas inlet, a detection cell mounted to the block past which the sample gas flows, a scrubber attached to the block that removes unwanted substances from the sample gas prior to said sample gas flowing past the detection cell, a valve mounted to the block, said valve having a first sample gas position that allows sample gas to flow past the detection cell and a second position that prevents sample gas from flowing past the detection cell, a first sample gas flow path extending from the sample gas inlet through the scrubber and the valve and past the detection cell to the gas outlet, and a second sample gas flow path in communication with the first sample gas flow path at a junction between the scrubber and the sample gas inlet and extending from said junction to the gas outlet, to divert a portion of the sample gas from flowing through scrubber and the valve and past the detection cell and to flow along said second sample gas flow path and exit the gas outlet so long as sample gas flows into the sample gas inlet at said elevated pressure, said first and second sample gas flow paths each including a restricted orifice sized to prevent a build up of excessive pressure in the scrubber when the valve is in the second position. 7. An instrument for analyzing a gas that is at a variable pressure elevated above atmospheric pressure, said gas flowing through the instrument to exit the instrument via a gas outlet at atmospheric pressure, said instrument comprising a block having a sample gas inlet including an orifice and a calibration gas inlet including an orifice, a detection cell mounted to the block past which the gas being analyzed flows, a valve mounted to the block, said valve having a closed position, a sample gas position, and a calibration gas position, a scrubber attached to the block that removes unwanted substances from the sample gas, a first passageway extending from the calibration gas inlet orifice through the valve and past the detection cell to the gas outlet, circumventing the scrubber, a second passageway extending from the sampl e gas inlet orifice through the scrubber and the valve and past the detection cell to the gas outlet, a third passageway in communication with the second passageway at a junction between the scrubber and the sample gas inlet orifice, said third passageway extending from said junction to the gas outlet, circumventing the scrubber, valve and cell and enabling at least a portion of the sample gas to flow through the third passageway and exit the gas outlet so long as sample gas flows into the sample gas inlet orifice at said elevated pressure, a bypass orifice positioned along the third passageway, said sample gas orifice and bypass orifice being sized to maintain the pressure within the scrubber when the valve is in the closed position or the calibration gas position at a reduced pressure substantially below the elevated pressure of the gas being analyzed. 8. The instrument of claim 7 where the gas introduced through either the sample gas inlet orifice or the calibration gas orifice is within the range from 1 to 100 pounds per square inch gage, and the orifices are sized so that the flow rate of gas through the instrument is within a predetermined range from 0.5 to 7 standard cubic feet per hour. 9. The instrument of claim 8 where the orifices have an area from 0.00001 to 0.0005 square inch. 10. The instrument of claim 7 where the bypass orifice has a predetermined size that is substantially greater than the predetermined size of the sample gas inlet orifice. 11. The instrument of claim 10 where the bypass orifice and sample gas inlet orifice each have a predetermined area, and the area of the bypass orifice is at least two times greater than the area of the sample gas orifice. 12. The instrument of claim 7 where the bypass orifice has a predetermined size that is substantially less than the predetermined size of the sample gas inlet orifice. 13. The instrument of claim 12 the valve is sealed and mounted within a cavity in the side of the block, said valve having a rotary member that is manually rotated between a closed position, a sample gas position, and a calibration gas position. 14. The instrument of claim 7 where the scrubber is detachably connected to the block upstream of the detection cell and down stream of the sample gas inlet orifice and comprises a see-through container holding a removable scrubber material that removes unwanted substances and changes color to indicate that said scrubber material is exhausted and needs replacement. 15. The instrument of claim 7 including a filter between the valve and the scrubber. 16. The instrument of claim 7 including a flow meter through which gas flows. 17. The instrument of claim 7 including a heater mounted to the block. 18. The instrument of claim 17 including a thermistor mounted to the block that is a component of a control circuit for compensating for the variation in cell output with temperature. 19. An instrument for analyzing a gas including a block having a sample gas inlet, a calibration gas inlet, and a gas outlet, a detection cell mounted to the block past which the gas being analyzed flows, a valve mounted to the block, said valve having a closed position, a sample gas position, and a calibration gas position, a first passageway in the block extending from the calibration gas inlet through the valve and past the detection cell to the gas outlet, a second passageway in the block extending from the sample gas inlet through the valve and past the detection cell to the gas outlet, a calibration gas orifice along the first passageway upstream of the valve and detection cell, a sample gas orifice along the second passageway upstream of the valve, said sample gas orifice having a predetermined size, and a third passageway in the block, including a bypass orifice downstream of the sample gas orifice, said third passageway in communication with the gas outlet while sample gas is being introduced through the sample gas inlet when the valve is in the sample
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