Thermal Conductivity Hydrogen & Chlorine Gas Analyzer (Wall Mount) - KK650
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HITECH INSTRUMENTS technical datasheet A member of the MTL Instruments Group KK650 Hydrogen and Chlorine Analyser Hydrogen analysis throughout the chlorine manufacturing process • Proven technology from the katharometer experts • Unique dual sensor technology • Works during start-up • Benign, surrogate gas calibration • Wet and dry sample systems • Low cost of ownership Applications • ‘Wet’ chlorine • ‘Dry’ chlorine • ‘Sniff’ or tail gas • Hypo plant outlet The KK650 is designed specifically for the chlor-alkali industry. Chlorine is usually manufactured by the electrolysis of brine (sodium chloride) or potassium chloride. This process also produces hydrogen and a small quantity is found in the chlorine stream. Larger quantities can indicate failure of a mercury cell, diaphragm or membrane and lead to potentially fatal explosive mixtures of hydrogen and chlorine. Hydrogen measurement is Hitech’s field of expertise but this application is not straightforward. Hydrogen levels are low and the mixture is not a binary one. In addition to the hydrogen and chlorine there is also oxygen, nitrogen and carbon dioxide (referred to as the ‘inerts’). At start-up the mixture will be mainly nitrogen purge gas with a gradually increasing percentage of chlorine. The old attempt at using a ‘flowing reference’ does not work in the latter scenario. The Hitech solution is to use two measurement sensors together with a third, sealed reference sensor. The process gas is passed across the first measurement sensor, then through a small heater where hydrogen is reacted, then across the second measurement sensor. With two discrete measurements, known thermal conductivities of the gases present and complex algorithms, the KK650 can accurately display both hydrogen and chlorine values. Sample conditioning is required for ‘wet’ chlorine applications. The Hitech system has no consumables or annual spares making it both easy to maintain and inexpensive to own. Pumped or aspirated versions are available to take account of the negative pressure usually found in ‘wet’ chlorine streams. The system cleans and dries the process gas, presenting it in optimum condition for the sensor, also included are a calibration port, flowmeter and needle valve. Two versions are available offering a hydrogen range of 0-5% or 0-10%. The 0-5% version is designed for measurement in ‘wet’ and ‘dry’ chlorine where hydrogen levels vary between 0.01% and 1.00% depending on the type of plant and point in the process. The 0-10% version is designed for the tail gas applications where hydrogen levels are typically in the 1-4% area but can rise above 5% in exceptional (and dangerous) instances. The weatherproof GRP enclosure for the electronics enables external mounting. With space in analyser shacks usually at a premium and the cost of a new shack being several times that of an analyser, this is a great advantage. The katharometer/reactor assembly is supplied on a small backplate for versatility. In the event of an exceptional occurrence, such as chlorinated liquid being released through the analyser, no lasting damage is usually done. Add to these features the low maintenance and zero consumables and then compare with competing optical or GC technologies. ‘Dry’ chlorine requires no special sample conditioning. Pressure and flow need to be optimised and a calibration port is a useful addition. This can be engineered by the user or, alternatively, Hitech can supply a system, including the sensor assembly, in a weatherproof GRP enclosure. Established technology, unique design, easy, low cost installation and low maintenance – a great combination.

ORDERING INFORMATION Gas measurement ranges Hydrogen: 0 - 5.00% or 0–10.00% Chlorine: 0-100.0% Stability < 1% f.s.d. over the operating temperature range. < 1% f.s.d./month Accuracy ±1% f.s.d. or ±2% f.s.d. depending on calibration method KK650 Hydrogen (0-5% or 0-10%) and chlorine analyser (0-100%), 110V or 220V Customer to specify hydrogen range and supply voltage Sample conditioning system for 'wet' chlorine, aspirated Sample conditioning system for 'wet' chlorine, pumped Consult Hitech Sample conditioning system for 'dry' chlorine, pressure regulated Repeatability < 1% f.s.d. Speed of...