Thermal Conductivty Gas Analyser (Portable) - K6050
- Minimises costly downtime
- Rugged and portable
- Minimises usage of the purge gas
- Reliable, simple to use
- Weatherproof to IP67
Modern power plant generators turbo generators, and turbine generators as used in power stations, produce a great deal of heat which must be dissipated. The preferred method of cooling is hydrogen cooling which has a cooling capacity of around seven times that of ambient air. It is essential that the hydrogen remains uncontaminated by air leakage or a potentially explosive gas mixture can result. Air in-leakage also increases the viscosity of the hydrogen and therefore its friction with the rotor, increasing the losses within the system. Before either filling with hydrogen or re-filling with air, it is necessary to use an inert intermediary gas to avoid creating a flammable mixture. Carbon Dioxide (CO2) is the gas most commonly used for this. Thus, for filling the generator, air is first purged from the system with CO2 and then the CO2 is purged out with hydrogen. The Alternator Purge Gas Monitor measures all stages of the hydrogen filling and air re-filling processes as well as the hydrogen purity during normal operation.
Principle of Operation
The Alternator Purge Gas Monitor uses the proven measuring principles found in Hitech's Model K850 analyzer which uses a katharometer. In construction the katharometer comprises two chambers, each with an identical thermal conductivity sensor. One chamber is sealed and is filled with a reference gas and the other receives the sample gas. The difference in thermal conductivity of the reference and sample gases is translated into a concentration figure by the microprocessor circuitry within the electronics unit. The inherent stability of this system and, its almost perfect temperature compensation, make the instrument one of the most accurate available.
The analyzer is supplied in a robust waterproof case with rechargeable battery power supply, which offers 6 hours of continuous operation. Continuous operation is possible by running the unit connected to the a.c. power supply. The integral pump, needle valve and flow meter are used to control the sample through the analyzer during the monitoring of alternator gases. The K6050 will display any of the following ranges, which are user-selectable through its keypad: 0 to 100% CO2 in Air 0 to 100% H2 in CO2 90 to 100% H2 in Air. A large LCD display shows measured values and also displays messages and prompts for the menu driven configuration and simple calibration routines.