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

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ProductApplicationTechnologyMeasuring rangeOutputTemperature rangeDocumentation
8774 Gas Density Sensor with analogue and PWM output
8774 Gas Density Sensor with analogue and PWM outputHigh and Medium voltage technologyOscillating quartz measurement0...60 kg SF6 /m3 10 ... 253 HzDigital: 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°CDatasheetManual
8775 Gas Density Sensor RS485/MODBUS
8775 Gas Density Sensor RS485/MODBUSHigh and Medium voltage technologyOscillating quartz measurement0...60 kg SF6 /m3 10 ... 253 HzRS485/Modbus (RTU)Permanent -40... +70°C (max. 200h per year) -55... +70°CDatasheetManual
87x6 Gas Density Monitor
87x6 Gas Density MonitorHigh voltage switchgearReference gas measurementAbsolute: 0...1.1 MPa / (0...1100 kPa)Floating change-over contact-40°C...80°CDatasheetManual
87x8 Gas density monitor for arctic temperatures
87x8 Gas density monitor for arctic temperaturesHigh voltage switchgearReference gas measurementAbsolute: 0...1.1 MPa / (0...1100 kPa)Floating change-over contact–60 ... +80°CDatasheetManual
879x Hybrid Gas Density Monitor RS485/MODBUS
879x Hybrid Gas Density Monitor RS485/MODBUSHigh voltage switchgearMechanical monitoring: Principle: Reference gas measurement Electronic monitoring: Principle: Oscillating quartz measurementMechanical 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 /m3RS485 / MODBUS-40°C...80°CDatasheetManual
878x Hybrid Gas Density Monitor with analogue output 2
878x Hybrid Gas Density Monitor with analogue output 2High voltage switchgearMechanical monitoring: Principle: Reference gas measurement Electronic monitoring: Principle: Oscillating quartz measurementMechanical 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 /m3Floating change-over contact-40°C...80°CDatasheetManual