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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)
About
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
Product code | 8774 |
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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 |
Applications | High voltage technologyMedium voltage technology |
Downloads Go to file downloads
Datasheet:
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H72507w Gas Density Sensor 8774en
pdf 1.2MB
Manual:
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H73507m Instruction 8774 Density Sensoren
pdf 744.8KB
Certificates:
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