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
  • -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 a 360° otation 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


Product details

Alternative product categoriesFlex radar, Freespace radar, Guided microwave, Guided wave radar (GWR), Micropower impulse radar MIR, Micropulse radar, TDR

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 sealsEPDM
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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