SF6 - Gas density monitoring
Trafag SF6 gas monitoring devices measure the gas density directly with patented technologies. This also allows monitoring of SF6 gas mixes.
Switching SF6 gas density monitors uses a unique gas density reference principle. The technique is very resilient to temperature changes and vibrations, the robust design is not subject to wrongful switching (contact bouncing) due to vibrations or shocks.
SF6 Gas Density Sensors uses a patented direct gas density measurement technology with quartz tuning forks. The technology measures the gas density direct instead of calculating the density from pressure and temperature. The sensors are temperature stable, maintenance free, vibration and shock proof and has excellent long-term stability.
Maximilian Grudin
Product division:
Pressure- and temperature sensors
View contact info
| Product | Application | Technology | Measuring range | Output | Temperature range | Documentation | |
|---|---|---|---|---|---|---|---|
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8774 Gas Density Sensor with analogue and PWM output | High and Medium voltage technology | Oscillating quartz measurement | 0...60 kg SF6 /m3 10 ... 253 Hz | 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) | Permanent -40... +70°C (max. 200h per year) -55... +70°C |  |
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8775 Gas Density Sensor RS485/MODBUS | High and Medium voltage technology | Oscillating quartz measurement | 0...60 kg SF6 /m3 10 ... 253 Hz | RS485/Modbus (RTU) | Permanent -40... +70°C (max. 200h per year) -55... +70°C | |
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87x6 Gas Density Monitor | High voltage switchgear | Reference gas measurement | Absolute: 0...1.1 MPa / (0...1100 kPa) | Floating change-over contact | -40°C...80°C | |
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87x8 Gas density monitor for arctic temperatures | High voltage switchgear | Reference gas measurement | Absolute: 0...1.1 MPa / (0...1100 kPa) | Floating change-over contact | –60 ... +80°C | |
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879x Hybrid Gas Density Monitor RS485/MODBUS | High voltage switchgear | Mechanical monitoring: Principle: Reference gas measurement Electronic monitoring: Principle: Oscillating quartz measurement | Mechanical monitoring, measuring range absolute: 0...1.1 MPa (0...1100 kPa) Electronic monitoring/sensor, measuring range absolute: 0...0.85MPa SF6 @ 20°C 0...56.1 kg SF6 /m3 | RS485 / MODBUS | -40°C...80°C | |
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878x Hybrid Gas Density Monitor with analogue output 2 | High voltage switchgear | Mechanical monitoring: Principle: Reference gas measurement Electronic monitoring: Principle: Oscillating quartz measurement | Mechanical monitoring, measuring range absolute: 0...1.1 MPa (0...1100 kPa) Electronic monitoring/sensor, measuring range absolute: 0...0.85MPa SF6 @ 20°C 0...56.1 kg SF6 /m3 | Floating change-over contact | -40°C...80°C | |
