FAFNIR

FAFNIR GmbH was founded in Hamburg, Germany, in 1965 by the Sager family to develop and manufacture sensors and control systems for the process automation sector.

FAFNIR is named after the dragon Fafnir from the Nibelungen Saga. FAFNIR GmbH, like its namesake, is constantly on the lookout for its most precious asset: customer satisfaction and product quality. As a result, this historic company has a stellar reputation for creating innovative, high-quality products while delivering exceptional customer service.

FAFNIR's initial product was an oil burner, which it developed and produced. The development of a safety system followed this to prevent tank and process tank overfilling, which set the pattern for future FAFNIR products. Thus, what began as a localised operation in Hamburg has evolved into an internationally recognised company with a global reach.

FAFNIR is well-known worldwide for designing and producing high-precision level measurement equipment for the petroleum, pharmaceutical, chemical, and food industries.



  • Highly accurate and precise
  • 2 Wire 4-20mA output
  • 200mm to 6000mm length options
  • Shock and vibration proof
  • Maintenance free
  • ATEX options available

Technical Datasheet
  • Level detector and transducer
  • Ideal for polluitng liquids
  • No moving parts
  • Maintenance free
  • 100mm to 3000mm length options
  • 3⁄4“ BSP thread (others available)

Technical Datasheet
  • Equipment Type: Alarm system for oil separators
  • Liquid: Diesel / Heating Oil, Petrol, Oil
  • Vessel: Oil Separator
  • Temperature: -40.00 °C up to 85.00 °C
  • Certification: ATEX, IECEx
  • Power Supply: 230 VAC
  • Additional criteria: Has display
  • Equipment Type: Magnetostrictive Level Measurement
  • Liquid: Chemicals, Fuel, Solvents, Water
  • Vessel:  Intermediate Bulk Container (IBC), Road Tanker, Ship
  • Measuring range: 100.00 mm up to 6 000.00 mm
  • Stem diameter: 12.00 Process
  • Connection: Fitting, Flange, None
  • Temperature: -40.00 °C up to 85.00 °C
  • Pressure: -1.00 bar up to 16.00 bar
  • Supply: 10 to 30 VDC, 15 VDC, 24 VDC
  • Process Connection: Fitting, Flange, None
  • Temperature: -40.00 °C up to 110.00 °C
  • Pressure: 0.00 bar up to 25.00 bar
  • Certification: ATEX, IECEx, WHG
  • For Any Tank Type or Size
  • Polluting, Corrosive or Expensive Liquids
  • Very Durable with Outstanding Reliability
  • Easy 2 Wire Terminal to Transducer
  • Up to 25 Bar Pressure & 80°C Temp.
  • 316Ti Stainless Steel Wetted Parts
  • Casing protection: IP20 Weight: 6.7 kg
  • Ambient temperature: 0 °C to + 40 °C
  • Supply: 230 VAC ± 10 %, approx. 50 VA
  • Internal display: 5.7“ TFT touch screen
  • Number of measuring sensors: 16 per sensor type
  • Equipment Type: Continuous Temperature Measurement Sensor
  • Liquid: Diesel / Heating Oil, Petrol, Oil
  • Measuring range: 40 °C to + 85 °C
  • Measuring length: 3,000 mm 22,000 mm
  • Certification: Il 1G Ex ia IIC T4 Ga
  • Measuring range: 1 000.00 mm up to 22 000.00 mm
  • Temperature: -40.00 °C up to 85.00 °C
  • Certification: ATEX, IECEx, Ex i
  • Additional criteria: Offers extra-high accuracy, For low ceiling height
  • Equipment Type: Leak prevention system
  • Liquid: Diesel / Heating Oil, Petrol,
  • Oil Vessel: Tank Interstitial, Double Walled Pipes
  • Temperature: -20.00 °C up to 60.00 °C
  • Certification: None, ATEX, IECEx, Ex i
  • Vessel: Oil Separator, Tank Interstitial, Tank Sump
  • Measuring range: 35.00 mm up to 400.00 mm
  • Temperature: -40.00 °C up to 85.00 °C
  • Certification: None, ATEX, IECEx, Ex i
  • Certification: None, ATEX, IECEx, Ex i
  • Signal output: Modbus ASCII (RS485), Relay, Veeder Root Protocol, H protocol, FAFNIR Protocol, Web Access
  • Power Supply: 110 VAC, 230 VAC
  • Vessel: Underground Storage Tank, Overground Storage Tank, Bulk Tank
  • Temperature: 0.00 °C up to 40.00 °C
  • Certification: None
  • Additional criteria: Has display
  • Measuring range: 600.00 mm up to 6 000.00 mm
  • Temperature: -40.00 °C up to 85.00 °C
  • Certification: None ATEXIECExEx i
  • Measuring range: 600.00 mm up to 5 000.00 mm
  • Temperature: -40.00 °C up to 85.00 °C
  • Certification: None, ATEX, IECEx, Ex i
  • Additional criteria: Offers extra-high accuracy
  • Measuring range: 600.00 mm up to 6 000.00
  • Temperature: -40.00 °C up to 85.00 °C
  • Certification: None, ATEX, IECEx, Ex i
  • Additional criteria: Offers extra-high accuracy
  • Measuring range [g/l] 710 900 to 440 660
  • Accuracy (VISY-Stick Advanced) [g/l] <1.0
  • Accuracy (VISY-Stick Flex) [g/l] 2.0
  • Resolution (VISY-Stick Advanced) [g/l]  0.1
  • Temperature range [°C]  -40to + 85
  • Dimensions (diameter X height) [mm]  0 50 X138.6
  • Operating pressure [bar]  3.0to 16
  • Material: Stainless steel
  • Local client-side server guarantees strong data protection
  • Standardized data format (XML)
  • Hierarchical data access enables company-specific access rights
  • Connection:Cable gland or conduit
  • Voltage:Ex ia 12 to 30 VDCi Ex d 12 to 50 VDC
  • Temperature:up to + 450 °C
  • Pressure:-1 bar to + 120 bar
  • Approval:Ex-Zone 0 (ATEX, IECEx)
  • Equipment Type: Overfill prevention
  • Liquid: Diesel / Heating Oil, Petrol
  • Vessel: Underground Storage Tank, Overground Storage Tank
  • Certification: ATEX, IECEx

Technical Datasheet
  • Equipment Type: Vapor recovery monitoring
  • Liquid: Petrol
  • Certification: ATEX

Technical Datasheet
  • Equipment Type: Overfill prevention
  • Liquid: Diesel / Heating Oil
  • Vessel: Oil Separator
  • Certification: None

Technical Datasheet
  • Equipment Type: Overfill prevention
  • Liquid: Diesel / Heating Oil, Petrol, LPG, LNG, Oil
  • Vessel: Underground Storage Tank, Overground Storage Tank, Bulk Tank
  • Certification: None

Technical Datasheet
  • Equipment Type: Leak prevention system
  • Liquid: Diesel / Heating Oil, Petrol, Oil
  • Vessel: Tank Interstitial, Double Walled Pipes
  • Temperature: -20.00 °C up to 60.00 °C
  • Certification: None, ATEX, IECEx, Ex i
  • Signal output: FAFNIR Protocol
  • Additional criteria: Offers extra-high accuracy

Technical Datasheet
  • Certification: None, ATEX, IECEx, Ex i
  • Signal output: Modbus ASCII (RS485), Relay, Veeder Root Protocol, H protocol, FAFNIR Protocol, Web Access
  • Power Supply: 110 VAC, 230 VAC

Technical Datasheet