发明名称 |
Analyzing system for high accuracy nitrogen determination |
摘要 |
An analyzer compensates for gas flow perturbations by providing a makeup flow of carrier gas to maintain the pressure and/or flow rate of analyte and inert gas through a detector constant such that a accurate determination of a low concentration of an analyte in the presence of a high concentration of a second analyte can be accurately determined. In one embodiment, a carrier gas is introduced through a valve responsive to the detected pressure in the gas flow stream between a scrubber and a subsequent detector for maintaining the pressure constant during an analysis. In another embodiment of the invention, a flow transducer is positioned in the gas flow path between the scrubber and detector and coupled to a flow control valve coupled to introduce carrier gas as a function of detected gas flow such that the flow rate of gas into the detector is maintained constant.
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申请公布号 |
US6623699(B1) |
申请公布日期 |
2003.09.23 |
申请号 |
US20000714480 |
申请日期 |
2000.11.15 |
申请人 |
LECO CORPORATION |
发明人 |
PACK BRIAN W.;GUERRA CARLOS;WILLIS PETER M.;MITCHELL JOEL C. |
分类号 |
G01N31/00;G01N1/00;G01N1/22;G01N31/12;G01N33/00;(IPC1-7):G01N31/12 |
主分类号 |
G01N31/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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