Trafag,8774,SF6气体密度变送器,SF6混合气特高压气体密度传感器
基本技术参数:
适用于SF6气体或是其它气体
SF6气体密度变送器应用于高压及中压开关柜
SF6气体密度变送器测量原理:石英晶振测量
变送器测量精度:1.0
温度信号精度:环境温度下±2°C,在 -40...85°C: ±3°C
变送器输出:数字信号或是模拟电流
Application High voltage switchgear
Medium voltage switchgear
Main characteristics
Density Sensor for SF6 and other gases ? Principle: Oscillating quartz measurement ? Measuring range: 0...60 kg SF6 /m3 ? Output Digital: current pulses onto supply current Analogue: current loop ? Accuracy: ±1.8% FS max. ±1.0% FS typ.
The Trafag gas density sensor type 8774 was specifically designed for surveying insulation gases. The gas density is measured with an oscillating quartz with excellent long term stability. The constant resonant frequency of a quartz oscillator under vacuum is compared with the resonant frequency of an identical quartz situated in the sample gas. The difference in the resonant frequency is proportional to the density of the sample gas. The measured density is proportional to the pulse frequency or to the mA output.
With the digital variant additionally the temperature can be measured over the pulse width of the frequency signal.
Main features
Continuous measurement of density and temperature ? long term drift free output signal ? Protection IP65 ? No maintenance ? Compact ? Vibration and shock proof ? Suitable for outdoor usage ? Response time <10ms (with density changes)