Tecfluid LU Series - GRM Válvulas e instrumentación
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Tecfluid LU Series

Ultrasonic level transmitter and indicator for liquids and solids

Tecfluid LU Series


  • No contact with the product
  • Compact design with polycarbonate housing (electronicsand display). Remote display available on request
  • Very good resistance in corrosive environments, outdoorsapplications,…
  • Easy to program by means of keyboard-display
  • Level indication with automatic compensation oftemperature changes
  • Low power consumption
  • Measuring range:
    • Liquids:
      • Model LU91: 0.30 … 6 m
      • Model LU921: 0.30 … 5 m
      • Model LU93: 0.45 … 12 m
      • Model LU923: 0.45 … 10 m
    • Solids:
      • Model LU91: 0.30 … 3.5 m
      • Model LU921: 0.30 … 2.5 m
      • Model LU93: 0.45 … 7 m
      • Model LU923: 0.45 … 5 m
  • Accuracy: ±2 mm (between 0.3 and 2 m)
  • Connections:
    • Models LU91 / LU921: G2 thread
    • Models LU93 / LU923: G2½ thread Others on request
  • Materials: PP, PVDF
  • Continuous level measurement, with 4-20 mA output
  • Maximum-minimum level alarms, in 4-wire version (ModelsLU91 and LU93)
  • Optional: HART communication protocol


Working principle

A transducer sends short ultrasonic pulses to a product surface. The reflection of these pulses is received back by the same transducer. The ultrasonic waves travel at the speed of sound. The time passed since the emission of the signal until it is reflected on the product surface (T1) plus the time necessary to receive the signal back on the transducer (T2) determines the distance between the sensor and the product. The calculation of this distance is carried out by means of a micro-processor with a powerful and smart software which selects the correct echo level among all the echos produced by the internal elements of the tanks. A temperature sensor built-in the transducer provides the real working temperature to the micro-processor, that makes the proper calculation corrections of the measured distance. A change in product does not affect the correct performance of the instrument, so it is not necessary to re-adjust the unit for each new product. The non-invasive level transmitter makes installation and maintenance easier.

Tecfluid LU Series


  • Level control in storage tanks of chemical and petrochemical products, treated water, waste water, rainwater,… And food products
  • Level control in storage silos of powder, granular products,…
  • Flow measurement in open channels, in combination with the electromagnetic sensor series FLOMAT (signal integration software not supplied)
  • Control of paper, cardboard, steel and plastic reels
  • Level control in intermediate tanks for processes such as pumps start-stop, valve opening-closing, etc.


  • LU91 … 93 4-wire system
  • LU91H … 93H4-wire system with HART protocol
  • LU921 … 923 2-wire system
  • LU921H 2-wire system with HART protocol


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