Gas monitor having an indicator band and a foretube

Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Calorimeter

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Details

422 86, 422 55, 422 61, G01N 2101, G01N 3122

Patent

active

045391815

ABSTRACT:
A gas monitor for measuring a test gas equipped with an indicator band comprises a foretube for chemically converting a gas to be measured contained in the test gas, the foretube comprising a glass tube having a tip at each end to be broken away for the passage of the gas therethrough and including a conversion effecting filling in the glass tube and a capillary tube defining a conduit parallel to the filling. In a gas monitor, an indicator band impregnated with an agent reacting with the special gas to be measured and contained in the tested gas, is moved to be exposed to a gas sample. For some gases, for example vinyl chloride, no chemically reacting indicators are known. In such instances, the sample to be tested is first directed through a foretube where the gas to be measured is converted to obtain a gas reacting with the indicator and thus measurable. In the inventive foretube, aside from the filling effecting the conversion, a capillary tube is mounted forming a parallel conduit. One stream of the gas sample then flows through the converting filling, and another stream flows through the capillary tube. The sample arrives at the indicator in its full amount as in prior art arrangements, yet the conversion in the foretube is substantially more effective and thus the determination is more reliable.

REFERENCES:
patent: 2004611 (1935-06-01), Kleinfelder
patent: 3033655 (1962-05-01), Grosskopf
patent: 3388975 (1968-06-01), Wallace
patent: 3503711 (1970-03-01), Skala
patent: 4052162 (1977-10-01), Clarke

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