Eaton KK650 Instruction Manual

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Eaton KK650 Instruction Manual Manual pdf 5 page image

INM MTL 130-0202 Rev 411 INTRODUCTIONThe KK650 measures hydrogen in the ranges 0 to 5% or 0 to 10% (depending on the model),and also chlorine in the range 0 to 100%, when these gases are mixed with air. It is designedspecifically for the chlor-alkali industry. Chlorine is usually manufactured by the electrolysisof brine (sodium chloride) or potassium chloride. This process also produces hydrogen anda small quantity is found in the chlorine stream. Larger quantities can indicate failure of amercury cell, diaphragm or membrane and lead to potentially fatal explosive mixtures ofhydrogen and chlorine!The complete analyser comprises two separate parts, the sensor/reactor and the control/display electronics, which are linked by multi-core cables.1.1 The katharometer sensorThis comprises two thermal conductivity measurement sensors and a sealed reference sensor.These are mounted together in one encapsulated assembly, which ensures that the sample gascomes into contact only with materials that are chemically inert. The katharometer assembly ismounted on a PVC panel along with its associated temperature controlled reactor.1.2 The control/display electronicsThese are housed in a separate IP66 enclosure containing the supply and signal processingfor the katharometer, along with the power supply and controller for the reactor. Hydrogenand chlorine concentrations are displayed together with the reactor temperature and status.Analogue outputs and volt-free contacts are also provided, depending on the options chosen –see specification.1.3 How it worksFirst, the thermal conductivity of the plant sample, as delivered, is measured. Next the sampleis passed through a heated reactor tube where the hydrogen is reacted with the excess ofchlorine (the hydrogen reacts preferentially with the chlorine and not with the oxygen withinthe sample). This mixture, now comprising chlorine, air and hydrogen chloride, is passedthrough the second sensor. The difference in thermal conductivity between the first and secondmeasurement is a direct function of the hydrogen content, which the instrument calculates.A measurement of thermal conductivity can only be used to interpret concentration where thechange of only one component affects the sample’s thermal conductivity, but measuring thehydrogen content in the way that we do means that the thermal conductivity measurement ofthe chlorine, hydrogen and air mix can be corrected for hydrogen content. This then enables thechlorine to air ratio to be calculated and hence the chlorine concentration.The KK650 relies on the hydrogen reacting with chlorine or oxygen in order to measure it,consequently it is not able to measure hydrogen in any other type of gas mixture, e.g. hydrogenin nitrogen. However, other analysers are available for this type of duty.Thermal conductivity measurements are not affected to a great extent by pressure fluctuationsof a few centimetres (or inches) W.G. For optimum accuracy the process gas sample should beflowed at 350ml/min. (100ml/min = 0.212cuft/hr).KatharometerAssembly TemperatureControlledReactor(725°C/1337°F)WARNINGThese parts run HOTin normal operationQuartz Reaction TubeOutline ofheat shieldConnectors are ¼“ double ferrule in PFAAll interconnecting pipework is in PFASample inSample out