Unique electronic SF6 gas density monitoring with quartz tuning fork
The Trafag gas density sensor type 8774 was specifically designed for monitoring insulation gases. This unique patented sensor technology opens new paths for the energy distributing industry to realize comprehensive trend analysis and monitoring. It measures directly and continuously the gas density providing an analogue or digital output signal. The version with digital output signal also provides the signal of the gas temperature.
Advantages
- Continuous digital or analogue output signal usable for SF6 trend analysis
- Wide density range
- Additional output of sensor temperature (digital version only)
- Extremely drift-free signal
- Outdoor application without additional protection
- Electromagnetic compatibility (EMC) according to EN/IEC 61000-4
- Density measurement of all gases possible
- Facilitates compliance with greenhouse gas regulations
Operating principle of the electronic gas density sensor
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. This difference is processed into an analogue or digital output signal. With the digital variant the temperature can be measured using the pulse width of the frequency signal.
Technical Data
