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Transit time ultrasonic flow meter for clean liquids

07 March 2016

The FDT7000 Series ultrasonic flow meter from Omega is known for it's ease of installation. The clamp-on pipe sensors do not require pipe fittings or breaking of the line, and they do not come into contact with the internal liquid.

The technology has inherent advantages over alternate ultrasonic devices including: low-cost, easy installation, no pressure head loss, no moving parts to maintain or replace, no fluid compatibility issue, and a wide measuring range that ensures reliable readings over liquid velocities from 0.1 to 6 metres/sec. The series is designed to work on PVC, PP and UPVC pipe systems.

The flow meter has a powered (sourced) 4 to 20 mA analogue output which shares a common ground with the power supply. The output transmits a continuous current signal that is proportional to liquid flow rate. The output is scaled at the factory; to ensure that the instrument or data acquisition system that is receiving the 4 to 20 mA signal responds properly, it must be spanned identically to the flow.

Features include:

  • “Clip-On" Design, Clamps Around Pipe For Simple Installation
  • Models for Pipe Sizes From DIN 15 to DIN 300
  • Local Display of Flow Rate and Total
  • 4 to 20 mA Retransmission of Flow Rate
  • RS485 Communications (Modbus®)
  • For Most Clean Liquids
  • IP54 Rated Enclosure (NEMA 3)


  • Flow Range: 0.1 to 6 m/s (0.3 to 19 ft/s)
  • Accuracy: ±1.5% FS
  • Repeatability: 0.3%
  • Measuring Liquid: Clean water based
  • Pipe Material: PVC-U/PP-R
  • Protection Rate: NEMA 3 (IP54)
  • Power Supply: 10 to 36 Vdc, at 500 mA maximum
  • Output: 4 to 20 mA (zero to full scale)
  • Communications: RS485 (Modbus)
  • Temperature Range:
    • Transmitter/Transducer: 0 to 50°C
  • Humidity: Up to 99% RH non-condensing
  • Housing: ABS plastic enclosure
  • Power Supply Cable: 3 metres long
  • Display: Liquid Crystal (LCD)
  • Weight: 0.5 kg