GD - DP - Gas Density and Dew Point Transmitter for SF 6
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COMDE DERENDA Gas Density and Dew Point Transmitter for SF6 Type: GD-DP Gas density transmitters are used for monitoring the gas density and the dew point temperature in high voltage circuit breakers and systems (containing SF6 gas). Pressure range Range dew point Temperature Humidity range (absolute) SF6 Density/Dew Point Transmitter Type: GD-DP SerNo.: 130202547 COMDE DERENDA ■ Digital output for pressure, temperature, SF6 density, dew point and pressure @20 °C ■ Compensation of pressure and temperature ■ Rugged construction Fields of Application • Power supply facilities • High voltage and gas insulated switchboards (GIS) • Medium voltage systems • Gas filled converters and generator switches as well as other applications, for indoor and outdoor use. Gas density dew point transmitters in high voltage systems, in combination with gas density monitors or PCs as well as customer specified diagnostic systems are used for documentation, trend analysis and data transmission. Compared to electromechanical density monitoring devices, which only feature several deactivation functions in case the SF6 density drops or dew point changing below a certain level, the GD-DP transmitter allows the online monitoring of the gas density and dew point temperature. This GD-DP transmitter consists of a piezoresistive pressure sensor and a particularly stable capacitive polymer dew point sensor and a build in analyzing unit for calculation of pressure, pressure @20 °C, SF6 density, temperature and dew point. The GD-DP transmitter is provided with an RS-485 output for pressure, temperature, SF6 density, dew point and pressure @ 20°C. Based on the piezoresistive sensor’s highly accurate, digitally compensated pressure and Temperature signals, the accurate gas density is determined by using an optimized formula for polynomial SF6 gas density approximation. The correct density value data will be displayed with a cycle time of 64 ms. With an appropriate programming of the built in analyzing unit this transmitter can also be used for the density monitoring of other gases. Comde-Derenda GmbH Kieler Strasse 9, 14532 Stahnsdorf / Germany info@comde-derenda.de www.comde-derenda.de

Gas Density and Pressure Monitoring Technical Data Gas Density Transmitter Type GD-DP Ranges SF6 density according to Beattie-Bridgeman formula Pressure Temperature dew point Humidity (absolute) Overload pressure Accuracy Total error band, pressure Total error band, temperature Total error, dew point temperature Total error, absolute humidity Stability error, pressure Stability error, temperature Stability error, dew point temperature Stability error, absolute humidity Measurement response time Operation / store and transport conditions Operating temperature Storage temperature Shock...