Tecfluid LTDR Series - GRM Válvulas e instrumentación
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Tecfluid LTDR Series

TDR Guided radar level transmitter for liquids and solids

Length: Simple rod 100 … 3000 mm, coaxial probe 100 … 6000 mm, cable probe 100 … 20000 mm. Accuracy: +-3 mm. Connections: Thread fitting G 3/4”, others on demand, Top or side mounted by means of by-pass chamber or in combination with LT series level indicator. Materials: EN 1.4404 (AISI 316L). 4-20 mA analog output, 1 x programmable transistor output for level detection. Options: ATEX version on demand.


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Tecfluid LTDR Series

TDR Guided radar level transmitter for liquids and solids

Tecfluid LTDR Series


  • Level measurement independent of changing processconditions (density, conductivity, temperature, pressure,…)
  • Innovative signal analysis and disturbance signalsuppression
  • Almost no installation restrictions
  • Different types of probes: single rod, coaxial and ropeprobe, interchangeable thanks to its modular design
  • Suitable for almost every liquid. Exceptional performance inliquids with low dielectric constant (i.e. low reflectivity) such as oils and hydrocarbons
  • Suitable for solids, mainly with rope probe version
  • Unmatched price / performance ratio
  • Measuring range:
    • Single rod probe: 100 … 3000 mm
    • Coaxial probe: 100 … 6000 mm
    • Rope probe: 1000 … 20000 mm
  • Connections:
    • G¾A or G1A threaded connection
    • EN 1092-1 DN40 flange or bigger
  • Materials: EN 1.4404 (AISI 316L), PEEKTM
  • 4-20 mA output
  • 1 x programmable transistor output for level detection
  • Optional:
    • ATEX version
    • Extended temperature version
    • Single rod PTFE coated
    • MODBUS RTU protocol

Working principle:

LTDR uses TDR (Time Domain Reflectometry) technology. Low-energy, high-frequency electromagnetic impulses, generated by the sensor’s circuitry, are propagated along the probe which is immerged in the liquid to be measured. When these impulses hit the surface of the liquid, part of the impulse energy is reflected back up the probe to the circuitry which then calculates the fluid level from the time difference between the impulses sent and the impulses reflected. The sensor can output the analyzed level as a continuous measurement reading through its analog output, or it can convert the values into freely positionable switching output signals. LTDR Sensors are also known as Guided Radars or Guided Wave Radars.


Tecfluid LTDR Series


Tecfluid LTDR Series


  • Level measurement in tanks/storage silos
  • Water and waste water treatment
  • Food and beverage industry
  • Chemical, petrochemical and car industry


  • LTDR single rod probe:
    • 6 mm, G¾ connection
    • 8 mm, G1 connection
  • LTDR rope probe:
    • 4 mm, G¾ connection
    • 6 mm, G1 connection

Suitable for a very wide range of applications with both liquids and solids (single rod 8 mm and rope probe are specifically indicated for the level measurement of solids). The signal has wider detection radius around the rod. Thus, it is more responsive for measuring signal disturbances which can be easily overcome by observing a few mounting considerations and making simple configuration adjustments to the sensor. These are also recommended for installation in metallic bypass chambers, which basically act together with the rod as a big coaxial probe.

  • LTDR coaxial probe:
    • G¾ connection

The high frequency measurement signal is completely contained within the outer tube, which provides immunity against any external conditions and interfering objects outside its tube. Ideal solution for a hassle-free “drop-in anywhere” installation, ensuring reliable measurement under almost any application condition. Ideal choice for measuring low reflectivity liquids (i.e. low dielectric constant) such as oils and hydrocarbons. Recommended for the use with clean liquids only. NOT recommended with viscous, crystallizing, adhesive, coating or sticky liquids, fibrous liquids, sludge, slurry, pulp or any liquids containing solid particles. Such liquids might cause build-up, bridging or clogging inside the coaxial probe.