The katharometer-based gas analyser K650 from Servomex was specially designed for measuring the presence of hydrogen in chlorine. The analyser measures the concentration of hydrogen (0 to 5 %) and chlorine (0 to 100 %) in mixtures of these gases with air and is used for measuring hydrogen in chlorine during chlorine production by the electrolysis of brine.
The sensor system of the K650 consists of two thermal conductivity measurement sensors and a sealed reference sensor, constructed so that only inert quartz and PFA couplings are in contact with the sample. The sensor is extremely stable and will normally hold its calibration to better than 0.25 % hydrogen for several months at a time. Chlorine accuracy varies according to air and hydrogen concentrations, typical accuracy in concentrations of 90 to 100 % being 0.2 %, reducing to approximately 1.5 % at lower concentrations with high hydrogen levels.
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