Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1997-12-31
1999-07-06
Williams, Hezron
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73 2901, 374 17, G01N 700, G01N 2502
Patent
active
059200103
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the field of measurement engineering, and more exactly, to the measurement of the moisture content of gases using the dew point method and can be used in dew-point hygrometers and corrosion condensate indicators.
A method of determining dew point is known which consists of directing the gas under investigation onto a cooled section of an optically transparent body through which a luminous flux is allowed to pass and recording fluctuations in the intensity of the luminous flux, by means of which judgment is passed on the onset of the dew point (SU N 593127, 1975),
However, when this method is used in dew-point hygrometers, the reliability of measurement is substantially reduced due to contamination of the cooled minor.
A device for determining dew point is known which comprises two light guides having a light-conductive core with a condensation mirror arranged in the gap between the end faces of the light guides, the condensation surface of the mirror being covered with a nonwettable film, a cooling device and a dew point register, wherein the lower portions of the end faces of the light guides are positioned in the plane of the condensation surface (SU No. 1806361, 1990),
However, when this device is used, contamination of the mirror with impurities is possible and this reduces the accuracy of measurement.
A method of determining dew point is known which consists of directing the gas under investigation onto a cooled section of an optically transparent body through which a luminous flux is allowed to pass and recording fluctuations in the intensity of the luminous flux, by means of which judgment is passed on the onset of the dew point, and also a dew point gage realized in this method and comprising a cooled section of an optically transparent body, which section is enclosed in a housing and is connected through light guides with radiators and with a converter of luminous flux connected to a register, a cooler and a temperature gage (SU No. 1744618, 1989).
A disadvantage of the known technical solutions is low reliability due to the possible contamination of the optically transparent body with impurities of the gas under investigation, as a result of which an unnecessary layer may be formed which may cause inaccurate measurements and loss of serviceability.
Technical result is to decrease the possible contamination of the optically transparent body.
To provide this result in a method of determining dew point which consists of directing the gas under investigation onto a cooled section of an optically transparent body through which a luminous flux is allowed to pass and recording fluctuations in the intensity of the luminous flux, by means of which judgment is passed on the onset of the dew point, the flow rate of the gas under investigation thus directed onto the cooled section of the optically transparent body is limited to zero while its molecular diffusion to the cooled section of the optically transparent body is preserved, and a dew point gage, comprising the cooled section of the optically transparent body enclosed in a housing and connected through light guides with a radiator and with a converter of luminous flux connected to a register, a cooler and a temperature gage, is provided with a sampling tube, one end of which is secured to the housing around the cooled section of the optically transparent body, while the other end is mounted in the direction of action of gravitational forces. Furthermore, in accordance with the invention the ratio of the internal cross-sectional area of the tube to the area of the surface of the cooled section of the optically transparent body exceeds 5, while I.sup.2 /S>25, where I is the length of the sampling tube, S is the internal cross-sectional area of the sampling tube, while the sampling tube is made beveled at the other end and is mounted with the bevel opposing the flow of gas under investigation.
The essence of the invention is that a stagnant zone of the gas under investigation is formed near cooled section of the optically trans
REFERENCES:
patent: 2669863 (1954-02-01), Shapiro
patent: 4040749 (1977-08-01), David et al.
patent: 4894532 (1990-01-01), Peterson et al.
patent: 5022045 (1991-06-01), Elliott
patent: 5127259 (1992-07-01), Kahl et al.
patent: 5198094 (1993-03-01), Mettes
patent: 5396325 (1995-03-01), Carome et al.
patent: 5664426 (1997-09-01), Lu
patent: 5758968 (1998-06-01), Diebold
Abstract in Russian and English of SU 593,127.
Abstract in Russian and English of SU 1,806,361.
Derevyagin Alexandr Mikhailovich
Gubanov Alexandr Georgievich
Seleznev Sergei Viktorovich
Stepanov Andrei Robertovich
Derevyagin Alexandr Mikhailovich
Politzer Jay L.
Williams Hezron
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