K1650 hydrogen purity and purge gas analyser
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HITECH INSTRUMENTS technical datasheet A member of the MTL Instruments Group K1650 hydrogen purity and purge gas analyser Designed for hydrogen cooled turbines in power stations • Single remote sensor • Measures all gas purge stages • ATEX certified for hazardous areas • Simple, low cost servicing • Optional sample systems • Easy replacement of old analysers Applications • Hydrogen purity measurement in turbo-generators • Hydrogen purity measurement in synchronous compensators • Inert gas monitoring during service shut downs The K1650 analyser has been designed specifically for use in power stations. Modern turbogenerators produce a great amount of heat and the most efficient way of removing this heat is by enveloping the parts in hydrogen because hydrogen has seven times the cooling capacity of air. It is possible however for air to leak into the system, so it is essential to monitor the hydrogen purity for both efficiency and safety - as an air mixture will produce a potentially explosive atmosphere. When maintenance needs to be carried out, the atmosphere surrounding the turbogenerator has to be replaced with air. This cannot be a direct replacement because of the explosive mixture that would be produced in the process. Instead, an inert gas, usually carbon dioxide, is used to purge the hydrogen, then air is introduced to purge the carbon dioxide. The same procedure must be followed in reverse when replacing the hydrogen atmosphere. The K1650 analyser has three ranges to monitor hydrogen purity and the shut down/start up purge stages of generators. A single katharometer sensor, based on Hitech’s proven thermal conductivity technology, is calibrated over the three ranges. The inherent stability of this system means infrequent calibration and a low cost of ownership. There are no consumables and no required spares for the first two years of operation. The K1650 fixed analyser is delivered already mounted in a panel for easy retrofitting. An MTL zener barrier is also mounted on the rear of the panel. This enables the remote sensor housing to be sited in a hazardous area with the analyser electronics in a safe area. The remote sensor is in a IP65 housing complete with flowmeter and needle valve. For full, hazardous-area use the analyser electronics can be supplied in an Ex enclosure. For portable analyser requirements the battery-operated K6050APGM analyser can be supplied in a rugged IP65 case. The K6050APGM combines all the features of the K1650 in a portable version with internal pump and rechargeable battery designed to last a full purge cycle. Flowmeter and needle valve are included as standard, no extra accessories are required. Different sample conditioning systems are available for the K1650, standard or bespoke, according to the process conditions. Filters, pumps and regulators can all be incorporated to deliver the sample in the correct condition. Oil mist, water vapour, calibration at pressure and returning the sample to the process can all be accommodated. Hitech engineers are ready to recommend the right system for you on receipt of full gas stream specifications. For sites using nitrogen as a purge gas (instead of CO2) please contact Hitech for an alternative solution. All your turbine gas analysis requirements in one package from the katharometer experts.

Electrical interconnection diagram SPECIFICATION Display Dot matrix LCD registering 4 lines of alphanumeric characters Hazardous area Safe area Ranges 0 to 100% CO2 in Air (Resolution 0.5%) 0 to 100% H2 in CO2 (Resolution 0.1%) 90 to 100% H2 in Air (Resolution 0.1%) Stability Better than 1% fsd/month K1650 Alternator Purge Monitor Sample inlet Sample pressure Set by vent pressure which must be nominally atmospheric HITECH INSTRUMENTS Sensor Unit Sample temp. –10°C to +55°C (non-condensing) Sample outlet Sample flow Between 100 to 300 ml/min for optimum performance Luton England....