Guided radar (TDR) level transmitter for basic liquid applications

  • Continuous level measurement in buffer, storage, collecting or recycling tanks
  • Intuitive quick setup procedure
  • Measuring range: 0.7…20 m / 2.3...65.5 ft
  • -50…+100°C / -58…+212°F; -1…16 barg / -14.5…232 psig

OPTIFLEX 1100 C – Version with single cable

Guided radar (TDR) level transmitter OPTIFLEX 1100 C – Version with single cable

The OPTIFLEX 1100 is a guided radar level transmitter based on the Time Domain Reflectometry (TDR) technology. It is designed for basic storage applications in non-hazardous areas. The level transmitter is a higher performing replacement for traditional level transmitters such as RF capacitance or conductive level transmitters.

Product highlights

  • Three types of probes which can all be shortened on site
  • Removal of the converter under process conditions and 360° rotation to make the display screen easier to read
  • Display keypad buttons directly accessible without opening the housing cover

Typical applications


  • Storage or simple process applications in non-hazardous areas
  • Applications involving basins, ports, locks

Water and wastewater industry

  • Water in storage or recycling tanks, basins etc.
  • Pump control and overfill protection in sludge tanks of wastewater plants

Food and beverage industry

  • Level control in water channels of fish farms
  • Frying oils from fast food chains
  • Pet food production
  • Livestock food management in breeding centres
  • Blood recovery in abattoirs

Power industry

  • Overfill protection in wastewater collection pits of power plants

Machinery and apparatus / OEM industry; Chemical industry

  • Level measurement in water purification systems (skids)
  • Cleaning agents for industrial washing machines
  • Paint from paint booths
  • Ink from filling machines

Minerals and mining industry

  • Cement in small silos

Automotive industry

  • Level monitoring of lubricants


Technical data

Measurement principlesGuided radar
Level measurement typeContinuous measurement
Measured mediaLiquids, Slurries
Contact to measured mediumYes
Interface measurementNo
Probe diameter
  • Coaxial Ø14 mm / 0.55" (segmented)
  • Single cable Ø2 mm / 0.08"
  • Single cable Ø4 mm / 0.15"
Probe length4…20 m/
13…65.5 ft
Measuring range (liquids)0.7…20 m/
2.3…65.6 ft
Measuring range (solids)0.7…10 m/
2.3…32.8 ft
Process pressure (relative)-1…16 barg/
-14.5…232 psig
Process temperature-50…100°C/
Wetted partsAustenitic stainless steel (1.4404/316L)
Process sealsEthylene propylene diene monomer (EPDM)
Accuracy (liquids)±10 mm/
±0.4 in
Accuracy (solids)±20 mm/
±0.8 in


Certificates/Approvals OthersEAC
Ingress protectionIP66/67, NEMA4X


Analogue outputs4…20 mA

Process connections

Thread connectionsMale:
G¾, G1
¾ NPT, 1 NPT

Related products

SU 600

Digital panel indicator for level transmitters

  • Digital indication and power supply for 4…20 mA/HART® level transmitters
  • With 2 integrated relays for pump control or other actuators
  • Wide-range power supply unit with 20…253 V AC/DC
  • Carrier rail, panel or wall mounting

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