Guided radar (TDR) level transmitter for general-purpose applications

  • Continuous measurement of level, distance, volume or mass
  • Measuring range: 0.7…20 m / 2.4…65.6 ft (liquids), 1…10 m / 3.3…32.8 ft (solids)
  • -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 C is a 2-wire (4...20 mA) guided radar level transmitter based on the Time Domain Reflectometry (TDR) technology. The device is a cost-effective level device for liquids and solids in non-hazardous areas. It is also a higher performing replacement for traditional level transmitters such as RF capacitance, conductive and pressure level transmitters.

Product highlights

  • Three probe types which can all be shortened on site
  • Quick coupling system: converter is rotatable and removable under process conditions
  • Display keypad buttons directly accessible without opening the housing cover
  • Intuitive 5-step quick setup procedure

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
  • 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

Related products

Product details

Product category Guided radar (TDR) level transmitter
Alternative product categories Micropulse radar, Flex radar, Guided wave radar (GWR), TDR, Micropower impulse radar MIR, Freespace radar, Guided microwave

Technical data

Product type Level transmitter
Measurement principles Guided radar
Level measurement type Continuous measurement
Measured media Granulates, Powders, Slurries, Pastes, Liquids, Solids, Bulk solids
Contact to measured medium Yes
Interface measurement No
Probe diameter
  • Segmented coaxial Ø14 mm / 0.55"
  • Single cable Ø2 mm / 0.08"
  • Single cable Ø4 mm / 0.15"
Probe length 4…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 parts Austenitic stainless steel (1.4404/316L)
Process seals EPDM
Accuracy (liquids) ±10 mm/
±0.4 in
Accuracy (solids) ±20 mm/
±0.8 in


Certificates/Approvals Others EAC


Analogue outputs Current (mA)

Process connections

Thread connections Male:
G3/4, G1
3/4 NPT, 1NPT

Download Center

  • Technical datasheets and handbooks
  • Flyers and brochures
  • Certificates and approvals
  • Software and driver
View OPTIFLEX 1100 related downloads