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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Handheld Doppler Flowmeter (NON-INVASIVE) Environment

Handheld Doppler Flowmeter (NON-INVASIVE)

Product Code:HFM

Need more Info? (514) 354-2511 - 1-800-463-4363


  • Hand Held, Lightweight, Non-invasive
  • Dual Crystal Self Aligning Transducer
  • Fits Pipe Sizes 1" Through 14"
  • Large LCD Velocity Display
  • Signal Strength LED Indicator
  • Externally Adjustable Velocity Calibration Control
  • Switch Selectable (HFM 1&2) Metric or English Velocity Units
  • Switch Selectable (HFM 4) English Velocity Units or GPM
  • Locking Type ON/OFF Switch
  • Rechargeable Batteries
  • Calculator Style Battery Charger
  • Aluminum Gasketed Enclosure
  • Available with Instantaneous Digital Velocity Readout (HFM-1) or with Instantaneous Digital Velocity Readout Plus 4-20 mA. Output (HFM-2), or with Instantaneous ft./sec. and direct GPM Readout (HFM-4)


Principle of operation

The HFM Flowmeter is a non-invasive device utilizing the frequency shift (Doppler effect) of a signal to measure the flow velocities of liquids. The transmitters feed a high frequence voltage to transmitter crystal of the transducer. The crystal converts the voltage to a high frequency mechanical signal which is projected through the wall of the pipe and into the liquid. The signals are reflected back to a receiver crystal by the discontinuities in the fluid. The frequency difference between the transmitted and received signal is directly proportional to the fluid's flow velocity. In order to receive an adequate frequency shift, the liquid must contain reflective particles such as air bubbles, minute particles or other well-defined discontinuities.



The normal fields of application are where conventional flowmeters do not work or create problems. Doppler flowmeters are usually more cost-effective in that they do not vary in price with an increase in pipe size. These instruments normally require no change in the piping system and installation is fast and inexpensive.


Water Treatment Chemical
  • Raw Sewage
  • Sludge
  • Effluent
  • Slurries
  • Process Water
  • Two-phase solutions
  • Effluent
Paper Mining
  • Chemical Dosing
  • Massa
  • Waste water
  • White water
  • Ore and coal slurries
  • Wash waters
  • Tailings



  HFM-1  HFM-2  HFM-4
Flow Range  0.3 to 6 m/sec. - 0.5 to 20 ft/sec. 0.5 to 20 ft/sec. and GPM
Accuracy  Digital readout: ±2.0 L.S.
Repeatability: ±0.2% (F.S. range)
Linearity: ±0.5% (F.S. range)
Resolution: 0.1 m/sec
Power  5 VDC, supplied by internal nickel-cadmium batteries (or Charger below)
Transducer  Dual crystal hinged for ease of alignment
Operating Temperature  Electronics -25°C to 85°C
Transducer -40°C to 150°C
Readout  12.5m LCD display with low battery indicator
Analog Output  N/A  4 to 20 mA. DC  N/A
Size  7.5" long x 4.25" wide x 2" deep
Weight  1.8 kilograms /4 lbs.
Chargers  2 styles available
Case  Padded nylon case holds flowmeter, transducer, interconnecting cables, couplant & charger.


Cat. No. Description
AUHFM-1000  HFM-1 Flow Meter
AUHFM-2000 HFM-2 Flow Meter with 4-20mA output
AUHFM-4000  HFM-4 Flow Meter with range of 0.5 to 20 ft./sec and GPM

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