Guided radar (TDR) level transmitter for heavy-duty level and interface applications

  • Continuous measurement of level, distance, volume, mass or liquid-liquid interface
  • Measuring range: 0.2…35 m / 0.7…115 ft (liquids), 0.2…35 m / 0.7…115 ft (solids)
  • -50…+300°C / -58…+572°F; -1…300 barg / -14.5…4350 psig

OPTIFLEX 1300 C – Version with single cable

Guided radar (TDR) level transmitter OPTIFLEX 1300 C – Version with single cable
The OPTIFLEX 1300 is a 2-wire (4...20 mA) guided radar level transmitter based on the Time Domain Reflectometry (TDR) technology. It measures the level of solids, liquids or liquid-liquid interfaces. The guided radar has higher signal dynamics and a sharper pulse than conventional TDR devices and therefore a better repeatability and accuracy. The OPTIFLEX 1300 offers a large variety of probes to meet any application requirement.

Product highlights

  • High pressure and high temperature (HP/HT) versions
  • Optional second current output, e.g. for analogue level and liquid-liquid interface output
  • Metaglas® process sealing system for optimal process safety (toxic products)
  • Wetted parts made of stainless steel, Hastelloy®C or PVDF; special materials available on request (e.g. Monel®, tantalum, titanium, duplex, Inconel® 625)
  • Quick coupling system: converter is rotatable and removable under process conditions
  • Stainless steel housing for corrosive environments
  • Optional weather protection
  • Also available with remote electronics that can be mounted up to 14.5 m / 47.6 ft from the probe
  • NACE design (MR 0175 / MR 0103 / ISO 15156)
  • ESD protection (30 kV) for increased resistance to electrostatic discharges in solid applications

Typical applications


  • Heavy-duty and liquid-liquid interface applications
  • Applications requiring hazardous area approvals
  • Highly vibrating installations (remote version recommended)

Chemical and petrochemical industry

  • Carbon dioxide (CO2), ammonia, solvents etc.

Oil and gas industry

  • Fuel, kerosene, diesel, ethane, ethylene, oil/water interface, condensate

Minerals and mining industry

  • Powders, granulates or pebbles, talc, coal, alumina etc.

Water and wastewater industry

  • Chlorine, calcium, sodium, bromine etc.

Power industry

  • Propane (LPG) and biofuels

Related products

Product details

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

Technical data

Product type Level transmitter
Measurement principles Guided radar
Level measurement type Continuous measurement
Measured media Bulk solids, Powders, Pastes, Solids, Liquids, Liquid/liquid interface, Slurries, Granulates
Contact to measured medium Yes
Interface measurement Yes
Probe diameter
  • Double rod
  • Single rod
  • Single rod (segmented)
  • Coaxial
  • Coaxial (segmented)
  • Double cable
  • Single cable Ø2 mm / 0.08"
  • Single cable Ø4 mm / 0.15"
  • Single cable Ø8 mm / 0.32"
Probe length 4…35 m/
13…115 ft
Measuring range (liquids) 0.2…35 m/
0.7…115 ft
Measuring range (solids) 0.2…35 m/
0.7…115 ft
Process pressure (relative) -1…300 barg/
-14.5…4350 psig
Process temperature -50…300°C/
Wetted parts Austenitic stainless steel (1.4404/316L), Austenitic alloy (2.4602/Alloy 22)
Process seals Kalrez® 6375, EPDM, FKM/FPM
Accuracy (liquids) ±3 mm/
±0.12 in
Accuracy (solids) ±3 mm/
±0.12 in


Certificates/Approvals Ex EAC, CSA, ATEX, IECEx, NEPSI, INMETRO, FM, KGS
Certificates/Approvals Others WHG
Ingress protection NEMA6/6X, IP66/67


Digital outputs HART®
Analogue outputs Current (mA)

Process connections

Flange connections EN (1092-1): DN25…200
ASME (B 16.5): 1…8"
Thread connections Male:
G1/2, G3/4, G1, G1 1/4, G1 1/2
1/2 NPT, 3/4 NPT, 1 NPT, 1 1/4 NPT, 1 1/2 NPT

Download Center

  • Technical datasheets and handbooks
  • Flyers and brochures
  • Certificates and approvals
  • Software and driver
View OPTIFLEX 1300 related downloads