Thermal measuring and testing – Transformation point determination – Between gaseous and liquid states
Patent
1991-08-12
1992-08-18
Yasich, Daniel M.
Thermal measuring and testing
Transformation point determination
Between gaseous and liquid states
73 73, G01N 2566
Patent
active
051393441
ABSTRACT:
A new method for determination of the dew-point of a humid gas by means of a light beam reflected by a dew-point mirror. During measurements of dew-points, particularly in the range between -50.degree. C. to -95.degree. C., excess moisture is added to the humid gas under measurement in the manifold. Thus the dew-point mirror is for a short period of time, impacted with a humid gas of higher water content. This results in a fast build-up of a layer of dew on the mirror. In the subsequent process of dew-point determination, this reduces the time of measurement significantly. For carrying out the method, a dew-point measuring device is described, which comprises a manifold with a by-pass circuit having a gas valve, an injector unit and a humidification unit. Particularly useful in the device is a humidification unit made of hygroscopic polyamide tube which ensures maintenance-free humidification of the gas by the water molecules diffusing into this tube from the ambient atmosphere.
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