8774 Gas Density Sensor with analogue and PWM output

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Main features

  • Continuous measurement of density and temperature
  • Long term drift free output signal
  • Maintenance free
  • Vibration and shock proof
  • Response time <10ms (with density changes)
Density Sensor for SF6 and other gases The Trafag gas density sensor type 8774 was specifically designed for monitoring 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.

Technical Data

More Information
Product code 8774
Designation Gas Density Sensor with analogue and PWM output
Measuring range 0...60 kg SF6 /m3 10 ... 253 Hz
Measuring principle Oscillating quartz measurement
Designation of application Density sensor for SF6 and other gases
Output signal Digital: current pulses Density signal: pulse frequency 10...292 Hz (range 0...60 kg SF6/m3) Analogue: 6.5...20 mA Density signal: current loop 10...275 Hz (range 0...56.1 kg SF6/m3)
Ambient temperature Permanent -40... +70°C (max. 200h per year) -55... +70°C

High voltage technology
Medium voltage technology

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